26015_Sawmill Hollow VIMP_FINAL_rev1_20240711

Prepared for
Northwestern Housing Enterprises, Incorporated
P.O. Box 1673
Boone, North Carolina 28607
VAPOR INTRUSION MITIGATION
SYSTEM DESIGN REPORT
SAWMILL HOLLOW PROPERTY
SAWMILL HOLLOW ROAD
BURNSVILLE, NC
Brownfields Project Number: 26015-22-100
Prepared by

Geosyntec Consultants of NC, P.C.
161 South Lexington Avenue
Asheville, North Carolina 28801
Project Number GN9110
June 2024
Revision 1

CERTIFICATION PAGE
VAPOR INTRUSION MITIGATION SYSTEM DESIGN REPORT
SAWMILL HOLLOW
SAWMILL HOLLOW ROAD,BURNSVILLE,NORTH CAROLINA
BROWNFIELDS PROJECT NO.26015-22-100
Prepared by:
Morgan A.Randolph,EIT
Profcssional
Revicwed by:
Todd N.Creamer,P.G.(NC,CA,
PA,WY)
Senior Principal
PROFESSIONAL ENGINEER SIGNATURE
I,Michacl S,Burcham,a Licensed Professional Engineer for Geosyntec Consultants of NC,P.C.,do
certify that the information in this report is correct and accurate to the best of my knowledge.
The Vapor Intrusion Mitigation System (VIMS)detailed herein is designed to mitigate the intrusion of
subsurface vapors into building features in accordance with the most recent and applicable DWM Vapor
Intrusion Guidance,Interstate Technology &Regulatory Council (1TRC)guidance,and American National
Standards Institute (ANSI/American Association of Radon Scientists and Technologists (AARST)
standards,or alternative standards approved in writing in advance by DEQ,and that a professional engineer
licensed in North Carolina,as cvidenccd by said cngineer's professional seal,is satisfied that the system
has been designcd so as to be fully protective of public health within the meaning of NCGS 130A-310.32
(a)(2),from known Brownficlds Property contaminants.
GeosyntecConsultants of NC,P.C.is licensed to practicc cngincering in North Carolina.The
certification number (Firm's License Number)is C-3500,H CA
'o 050312
blh/24GINEAEL8URCHAM
S
Michacl S.Burcham,PE (Nc,TX)
Senior Engincer
North Carolina P.E.License No.O50312
Expiration Date:December 31,2024
GeosyntecConsultants of NC,P.C.
2501 Blue Ridge Road Suite 430
Raleigh,NC 27607
Telephone:[phone]
Michael S.Burcham,PE (Nc,TX)
Senior Engineer
Prepared by:

GN9110/CAR230139 i June 2024
TABLE OF CONTENTS
1. INTRODUCTION .............................................................................................. 1
1.1 Site Description ......................................................................................... 1
1.2 Redevelopment Plans ................................................................................ 1
1.3 Site Environmental History ....................................................................... 2
1.4 Methane Assessment ................................................................................. 4
1.5 Regulatory Setting ..................................................................................... 4
1.6 Report Organization .................................................................................. 5
2. DESIGN BASIS ................................................................................................. 7
2.1 Design Objective ....................................................................................... 7
2.2 Design and Mitigation Approach .............................................................. 7
2.3 Design Criteria .......................................................................................... 8
2.4 Mitigation Method Overview .................................................................... 8
2.5 Mitigation Monitoring Overview .............................................................. 9
2.6 VIMS Components ................................................................................... 9
2.7 Vapor Barrier Components ..................................................................... 10
2.8 Subslab Venting Layer Components ....................................................... 11
2.8.1 Aggregate Venting Layer ............................................................ 11
2.8.2 Extraction Piping ......................................................................... 11
2.8.3 Air Inlet Piping ............................................................................ 13
2.8.4 Mitigation Fan ............................................................................. 13
2.9 Monitoring System .................................................................................. 13
2.9.1 Subslab Vapor Monitoring Probes .............................................. 14
2.9.2 Indoor Air Reference Monitoring Port ........................................ 15
2.9.3 Extraction Riser Monitoring Port ................................................ 15
2.9.4 Extraction Riser Differential Pressure Sensor ............................. 16
3. QUALITY ASSURANCE AND QUALITY CONTROL ............................... 17
4. POST-CONSTRUCTION DIAGNOSTIC TESTING AND PRE-OCCUPANCY MONITORING .............................................................. 18
4.1 Pre-Occupancy Methane Screening ........................................................ 18
4.1.1 Methane Screening Procedure ..................................................... 18

GN9110/CAR230139 ii June 2024
4.1.2 Results Transmittal ...................................................................... 19
4.2 VMS Diagnostic Testing ......................................................................... 19
4.2.1 Pressure Field Extension Testing ................................................ 20
4.2.2 Flow and Vacuum Monitoring .................................................... 20
4.2.3 VOC Monitoring ......................................................................... 20
4.3 Pre-Occupancy Monitoring ..................................................................... 20
4.3.1 Pre-Occupancy Operational Evaluation ...................................... 21
4.3.2 Pre-Occupancy Subslab Soil Gas Sampling ............................... 21
4.3.3 Pre-Occupancy Indoor Air Sampling .......................................... 22
4.3.4 Pre-Occupancy Risk-Based Screening Evaluation ..................... 23
5. POST-OCCUPANCY SYSTEM EFFECTIVENESS TESTING .................... 24
5.1 VIMS Operational Monitoring ................................................................ 24
5.2 VIMS VOC Sampling ............................................................................. 24
5.3 Post-Occupancy Methane Screening ...................................................... 25
6. FUTURE VIMS MODIFICATIONS ............................................................... 26
7. REPORTING ................................................................................................... 27
8. OPERATIONS, MAINTENANCE, AND MONITORING PLAN ................. 29
9. PROFESSIONAL ENGINEER STATEMENT ............................................... 30
10. REFERENCES ................................................................................................. 31

GN9110/CAR230139 iii June 2024
TABLE OF CONTENTS (CONTINUED)
LIST OF TABLES
Table 1 Recommended VIMS Products
Table 2 Design Air Exchange Rates
Table 3 Monitoring System

LIST OF FIGURES
Figure 1 Site Location Map
Figure 2 Proposed Redevelopment Plan
Figure 3 Proposed Redevelopment Plan and Soil Gas Sampling Results Map
Figure 4 Proposed Redevelopment Plan and Methane Results
LIST OF APPENDICES
Appendix A Construction Drawings
Appendix B Technical Specifications
Appendix C Construction Quality Assurance Plan for Vapor Intrusion Mitigation
System
Appendix D Typical Material Product Sheets
Appendix E VIMS POC Information
Appendix F Historical Environmental Data
Appendix G Example VIMS OM&M Forms

GN9110/CAR230139 1 June 2024
1. INTRODUCTION
Geosyntec Consultants of NC, P.C. (Geosyntec) on behalf of Northwestern Housing
Enterprises, Incorporated (NHE), the Prospective Developer (PD) has prepared this Vapor
Intrusion (VI) Mitigation System (VIMS) Design Report (VIMS Design or Report) for the
North Carolina Department of Environmental Quality (NCDEQ) Brownfields
Redevelopment Section (BRS) for the Sawmill Hollow Brownfields Property (Site). A Letter
of Eligibility (LOE) was received for the property on November 10, 2022, indicating that the
Site was eligible for entry into the Brownfields program and the Site was assigned the
Brownfields Project Number 26015-22-100. As of this Report submittal, a Brownfields
Agreement (BFA) has not been finalized.
This Report presents the design basis for VIMS to be installed at each of the 26 new
affordable rental tiny homes (referred to herein as “residential units”) and the community
building with amenities. The Report also provides the Construction Drawings (Appendix
A), Technical Specifications (Appendix B), and the Construction Quality Assurance (CQA)
Monitoring Plan (Appendix C), collectively referred to herein as the Construction
Documents. Product specification sheets for typical products to be used in the construction
of the VIMS are included as Appendix D. Actual products to be used will be approved by
Geosyntec’s Engineer of Record (EOR) following the review of proposed product submittals
issued by the Contractor and will be provided to the BRS as part of postconstruction
documentation (Section 7). If the products identified in Appendix D deviate, the BRS will
be notified prior to installation. Point of contact (POC) information for the developer, VIMS
consultant, and Brownfields Project Manager are provided in Appendix E. The VIMS
installation contractor has not been selected at the time of submittal.
1.1 Site Description
The Site is located at the intersection of Sawmill Hollow Road and US Highway 19E in
Burnsville, North Carolina, as shown on Figure 1. The Site is identified as Yancey County
Parcel Identification Number (PIN) 083003244675000 and is a 3.86-acre parcel that includes
two noncontiguous properties separated by Fair Haven Drive that are accessed from the
Site’s western boundary via Sawmill Hollow Road. The Site is owned by NHE and is vacant.
1.2 Redevelopment Plans
NHE intends to redevelop the Site into a rental community composed of 26 residential units
and a community building with amenities, which will collectively be referred to as the Site’s
“buildings.” The buildings will be part of a single rental entity; no residential units will not
be sold individually.

GN9110/CAR230139 2 June 2024
The proposed redevelopment plan is presented on Figure 2, and with buildings as follows:
• The community building is approximately 1,500 square feet (ft2) and is planned to
consist of tenant amenities 1 story high.
• Single-story residential units will be approximately 450 to 650 ft2 and consist of four
unit types of varying layouts (Units C, F, G, and H).
1.3 Site Environmental History
A Site history is included in the Supplemental Assessment Report (Geosyntec 2022), which
includes descriptions of the historical on-site operations (sawmilling and woody waste
processing) and notable occurrences (two fires on-site). Also included is a summary of the
Phase II Environmental Site Assessment (ESA) performed in December 2021 by
WithersRavenel. The Phase II ESA included limited groundwater and soil gas sampling
(WithersRavenel 2022), and the Phase II ESA tables and figures presenting the results are
provided in Appendix F. In general, the Phase II ESA results indicated that petroleum
products and some chlorinated solvents were present at low concentrations in soil gas and
that metals, some volatile organic compounds (VOCs), and formaldehyde were present at
low concentrations in groundwater at the Site. WithersRavenel screened soil borings with a
photoionization detector (PID) and those results indicated that VOCs were not present in Site
soils evaluated.
Geosyntec conducted soil gas and soil sampling at the Site in September 2022 and the results
are presented in the Supplemental Assessment Report (Geosyntec 2022). Tables and figures
summarizing the results of the supplemental assessment are provided in Appendix F and
summarized below.
• Soil sampling results indicated that pentachlorophenol, arsenic, cadmium, and
hexavalent chromium were present in Site soil above their respective Residential
NCDEQ Residential Health Based Preliminary Soil Remediation Goals (PSRGs).
• Soil gas sampling results indicated that benzene, ethyl benzene, and naphthalene
were present in Site soil gas at concentrations above respective NCDEQ Residential
Vapor Intrusion Screening Levels (VISLs) for subslab and exterior conditions
(SGSLs). These soil gas results, as well as WithersRavenel’s, are summarized on
Figure 3.
• Buried woody debris was observed at multiple soil boring locations during soil
sampling and soil gas probe installation.

GN9110/CAR230139 3 June 2024
• Due to historical Site use as a sawmill, methane screening was conducted during soil
gas sampling. Results indicated that methane was detected at or above 1.25 percent
(%) by volume (%v) at two soil gas probes installed in the central portion of the Site,
near where buried woody debris was observed during the supplemental assessment.
Methane concentrations of 1.25%v is equal to 25% of the methane Lower Explosive
Limit (LEL). Methane was detected below 1.25%v at three other soil gas probes.
These methane screening results are summarized on Figure 4.
• All on-site data collected to date were evaluated with the NCDEQ Risk Calculator
following the Risk-Based Guidance (NCDEQ 2023). Risk Calculator output
indicated that risks posed by Site soils, the groundwater to indoor air VI pathway, or
the soil gas to indoor air pathway to the evaluated receptors were acceptable. Further
details of the NCDEQ Risk Calculator evaluation are provided below:
o The groundwater direct contact pathway Risk Calculator was not refined, as
the unacceptable screening risk output from the initial Tier 1 analysis can be
managed with institutional controls.
o For the soil gas to indoor air pathway for residents, the cumulative calculated
screening-level carcinogenic risk was 2.4E-5 and screening-level hazard
index (HI) was 0.97.
Geosyntec conducted test pitting at the Site on March 7, 2023, to evaluate the extent and
nature of the buried debris observed on Site, notably in the area around the elevated methane
detections. Geosyntec identified the approximate boundaries of a woody debris pile
(appearing to be comprised of mulched wood) and a buried woody debris mound (appearing
to be comprised of mulched wood and Site soils). The results of test pitting are presented in
the Woody Debris and Soil Characterization Work Plan (Geosyntec 2023a). The Woody
Debris and Soil Characterization Work Plan (Geosyntec 2023a) also presents the means and
methods for characterizing these materials for future export from the Site. Between January
5, 2024 and February 9, 2024 excavation and off-site export of woody debris was conducted.
Geosyntec provided limited oversight of the excavation activities and confirmed that work
was completed in general accordance with the Site’s approved Environmental Management
Plan (EMP)1. NHE’s grading contractor, Young & McQueen Grading Company, removed
approximately 1,600 tons of woody debris from the Site and transported the materials to
Foothills Environmental Landfill in Lenoir, North Carolina. These activities will be formally
documented in the next EMP Redevelopment Summary Report.
1 North Carolina Brownfields Redevelopment Section Environmental Management Plan
(Geosyntec 2023)

GN9110/CAR230139 4 June 2024
The natural decay of organic material, such as woody debris, produces methane which can
accumulate in subsurface soil as a gas. As described in Section 1.4 of this report, Geosyntec
preformed a methane assessment to evaluate methane concentrations in soil gas after the
removal of the woody debris.
1.4 Methane Assessment
BRS required assessing the effectiveness of woody debris removal in reducing methane
concentrations in soil gas at the Site. Unless otherwise stated by the BRS, requirements that
provide acceptable levels of methane in soil gas for the Brownfields Property are detailed in
the NCDEQ Brownfields Minimum Requirements for Townhome Developments (NCDEQ
2020a) Brownfields Program Threshold Criteria for Methane Site Development (BRS
Methane Guidance) (NCDEQ 2020b).
Geosyntec completed the methane assessment from February through May 2024 in general
accordance with the Methane Assessment Work Plan (Geosyntec 2024a). Geosyntec oversaw
the installation of three soil gas monitoring probes within the excavation footprint on
February 22, 2024, approximately two weeks after completing the woody debris excavation.
Geosyntec then monitored methane in soil gas purged from each soil gas monitoring probe
during three screening events: (i) baseline on February 22 and 26, 2024; (ii) Month 1 on
March 29, 2024; and (iii) Month 2 on May 1, 2024. Results indicated that methane
concentrations decreased in the excavation area to below 1.25%v at each monitoring location
and methane was not detected at two soil gas monitoring probes by the Month 2 event.
Geosyntec submitted results to the BRS on May 15, 2024 and further details of the methane
assessment are provided the Summary of Methane Assessment memorandum (Geosyntec
2024b). As such, development of a VIMS design, as presented herein, will focus on the
presence of VOCs in soil gas at the Site
As discussed with the BRS, limited additional methane screening will be conducted during
construction and after occupancy as described in Sections 4 and 5 (respectively) to further
evaluate whether residual methane remains on Site in soil gas beneath building slabs. These
additional screening activities will be conducted pre-occupancy and post-occupancy and
results will be used to evaluate if modification of the VIMS is needed to address the presence
of methane.
1.5 Regulatory Setting
Based on the results from the referenced reports, the design and installation of a VIMS at
each residential unit and the community building has been required by the BRS.

GN9110/CAR230139 5 June 2024
Since VOCs have been detected in Site soil gas, the Report has been prepared in general
accordance with the VIMS Design Submittal Requirements (NCDEQ 2024a).
Since methane was detected above 1.25%v in soil gas prior to woody debris excavation, and
additional screening will be required to confirm that methane is no longer present above
actionable levels, the VIMS design will include limited design requirements from the BRS
Methane Guidance (NCDEQ 2020b). This approach will allow the VIMS to be modified to
mitigate methane if needed, based on the pre-and post-occupancy screening results
(described in Section 4 and 5, respectively). If the VIMS needs to be modified for methane
mitigation, additional components (e.g., non-sparking motor fan, sensor, monitoring
components) will be installed. If needed, recommendations for methane mitigation, and, if
necessary, design details for methane mitigation and monitoring will be included under
separate cover (as further discussed in Section 7).
This Report, along with the Environmental Management Plan (EMP) for Site prepared by
Geosyntec and dated June 23, 2023 (Geosyntec 2023b), are intended to support NCDEQ in
the development of the BFA for the Site.
1.6 Report Organization
The remaining sections of this Report and their contents are listed below:
• Section 2 – Design Basis: provides an overview of the VIMS objective, operational
criteria, and a description of various components of the VIMS.
• Section 3 – Quality Assurance and Quality Control: describes Quality Assurance
(QA) and Quality Control (QC) measures for VIMS construction.
• Section 4 – Post Construction Diagnostic Testing and Pre-Occupancy Monitoring:
provides the planned testing and monitoring methods to evaluate operation of the
VIMS.
• Section 5 – Post-Occupancy Effectiveness Testing: provides details of the required
VIMS post-occupancy monitoring.
• Section 6 – Future VIMS Modifications: provides guidance on how to manage future
modifications to the VIMS or the buildings, if building modifications could impact
the VIMS.
• Section 7 – Reporting: presents the approach to document the observations made
during the construction of the VIMS and the results of the post-construction/pre-
occupancy monitoring.

GN9110/CAR230139 6 June 2024
• Section 8 – Operations, Maintenance, and Monitoring: provides a concept plan to
support the continued Operation, Maintenance, and Monitoring of the VIMS.
• Section 9 – Professional Engineer Statement: provides a statement by the EOR as to
the quality of the VIMS design.
• Section 10 – References: provides a list of references.

GN9110/CAR230139 7 June 2024
2. DESIGN BASIS
This section provides details of the VIMS design, including the design objective, approach
to design and mitigation, operational criteria, and a description of various components of the
VIMS.
2.1 Design Objective
The objective of the VIMS design is to mitigate the potential migration of subsurface VOC
vapors into indoor air at the proposed residential units and community building. This
objective will be met in accordance with the most recent and applicable guidelines including,
but not limited to, the NCDEQ Division of Waste Management (DWM) VI Guidance,
Interstate Technology & Regulatory Council (ITRC) guidance, and American National
Standards Institute (ANSI)/American Association of Radon Scientists and Technologists
(AARST) standards.
As previously discussed, the VIMS design was also developed with the objective of allowing
for future VIMS modifications to mitigate methane based on pre- and post-occupancy
screening results as discussed in Sections 4 and 5, respectively.
The sealing professional engineer (PE) is satisfied that the design is fully protective of public
health from known Site contaminants.
2.2 Design and Mitigation Approach
The VIMS design presented herein includes details to install, operate, and monitor an active
VIMS at each building. The primary mechanism for mitigating VI will be inducing a vacuum
below each building’s concrete slab that will induce outdoor air to flow beneath the concrete
slab and generate a negative pressure in subslab soil gas relative to indoor air.
Each VIMS will include a geomembrane vapor barrier installed underneath the concrete slab
that is applicable to both VOCs and methane. A mechanical fan installed at each VIMS will
induce a vacuum within an aggregate venting layer installed underneath the geomembrane
vapor barrier. Vapors that migrate upward from the subsurface beneath each building will be
collected in the aggregate venting layer and exhausted outdoors by the mechanical fans.
Monitoring systems will also be installed to monitor the operation of each VIMS.
If methane mitigation is needed, select buildings may have their VIMS modified to include
methane-specific components (fans and monitoring system); this would be described under
a separate cover (Section 7). Other mitigation components will be the same for each building.

GN9110/CAR230139 8 June 2024
2.3 Design Criteria
The primary design criteria for the VIMS is to maintain subslab soil gas depressurization at
a minimum of 4 pascal (Pa) or greater as compared to indoor air pressure in each building.
This is consistent with NCDEQ VIMS Design Submittal Requirements (NCDEQ 2024a) that
indicates that an active VIMS is considered “sufficiently depressurized” if it generates a
pressure differential throughout the building footprint of at least 4 Pa.
However, the proposed VIMS design relies upon a combination of subslab depressurization
(SSD) and subslab venting (SSV) to mitigate subslab VOCs, to provide the potential to
modify the VIMS in the future to address methane. SSV systems (also referred to by the BRS
as “sweep” systems) are often used for methane and VOC impacted sites and are considered
“alternate systems” in the NCDEQ VIMS Design Submittal Requirements (NCDEQ 2024)
that are not designed to target depressurization thresholds. These types of sweep systems can
effectively mitigate soil gas impacts while maintaining a pressure differential of less than 4
Pa. Therefore, in the event that the proposed VIMS does not maintain a pressure differential
of at least 4 Pa additional performance metrics/lines of evidence will be employed to evaluate
the effectiveness of VIMS operations, with the approval of the BRS. Other lines of evidence
may include, but may not be limited to:
• differential pressure and/or flow within extraction risers; and/or
• subslab soil gas screening data at discrete points for total VOCs; and/or
• subslab soil gas analytical results for VOCs; and/or
• indoor air analytical results for VOCs.
The approach for VIMS performance monitoring (both pre- and post-occupancy) is
discussed further in Sections 4 and 5 of this Report.
2.4 Mitigation Method Overview
The VIMS design relies upon a combination of SSD and SSV to mitigate subslab VOCs
below each building (and methane, contingent on pre-occupancy and post-occupancy
monitoring).
SSD creates a lower relative pressure below the building slab, compared to the building
interior, which can be achieved with either a passive (e.g., driven by natural wind and/or
thermal gradients) or an active (e.g., the use of fans or blowers) system. The VIMS design
presented herein relies on an active system. To document SSD effectiveness, the NCDEQ

GN9110/CAR230139 9 June 2024
VIMS Design Submittal Requirements (NCDEQ 2024a) requires that pressure differential
be measured at discrete point(s) throughout the building footprint. As described in Section
2.3, the NCEQ indicates that an SSD should achieve a minimum pressure differential of 4
Pa.
SSV encourages communication with outside air to induce pressure gradients and move air
beneath the slab-on-grade foundation through advection. Typically, fresh air inlet piping
provides a mechanism for outdoor air to sweep through the venting aggregate, dilute vapor
concentrations, and discharge the diluted vapors through vapor extraction piping. When
operating with an active mechanical fan, SSV VIMS often achieve the design objectives of
an SSD VIMS. Furthermore, an SSV VIMS can also be easily transitioned to an SSD VIMS
by capping the fresh air inlet piping, if warranted.
Due to the small footprint of each residential unit (approximately 450 to 650 ft2), fresh air
inlets are not necessary to facilitate the movement of outside air beneath the slab-on-grade.
The community building’s footprint is larger (approximately 1,500 ft2), so fresh air inlets
will be installed to facilitate outdoor air flushing beneath the slab.
2.5 Mitigation Monitoring Overview
The VIMS design uses a monitoring system installed at each building to evaluate the VIMS
operational status and the effectiveness of each VIMS at achieving the design objective and
criteria. The VIMS monitoring system installed at each building consists of at least one
subslab vapor monitoring probe installed below the building’s footprint, one differential
pressure transmitter installed at the extraction riser, and a telemetry system to provide remote
notifications to individuals to be designated in the forthcoming Operation, Maintenance, and
Monitoring (OM&M) Plan (Section 8).
2.6 VIMS Components
The VIMS installed at each building will include a vapor barrier, a subslab venting layer,
and a monitoring system. The components of each are presented in the Construction
Drawings (Appendix A) and described below:
• Concrete slab
• Non-woven cushion geotextiles (upper and lower)
• Geomembrane vapor barrier

• 6−inch-thick venting aggregate Subslab Venting Layer
Vapor Barrier

GN9110/CAR230139 10 June 2024
• Vapor extraction 1-inch thick vent strip connected to solid
polyvinyle chloride (PVC) conveyance piping
• Community Building Only: Air inlet 1-inch thick vent strip
connected to solid PVC conveyance piping
• Mitigation fan (under active operation)

• Subslab vapor monitoring probe
• Indoor air reference monitoring port (residential units only)
• Extraction riser monitoring port
• Extraction riser differential pressure sensor

Details for each of these components is described in the subsections below and recommended
products used to construct these VIMS components are included Table 1. As described in
Section 1, actual products to be used will be approved by Geosyntec’s EOR following the
review of proposed product submittals issued by the Contractor. All electrical work required
to install electrified VIMS components will be completed by a licensed electrician according
to applicable codes.
2.7 Vapor Barrier Components
The purpose of the vapor barrier is to reduce the migration of soil gas into the structures. The
vapor barrier will include a concrete slab, underlain by an upper non-woven cushion
geotextile, a geomembrane vapor barrier, and a lower non-woven cushion geotextile.
The extent of the geomembrane vapor barrier will include the entire proposed ground floor
footprint for every building on Site. The geomembrane vapor barrier will be continuous
between footings and will consist of a minimum 20-mil2 geomembrane manufactured for use
in VI mitigation applications. The geomembrane vapor barrier seams, connections to the
building foundation, and utility penetrations will be sealed using spray applicators
specifically formulated for use in VI mitigation applications. The spray-applied
geomembrane vapor barrier seams will have a minimum thickness of 60-mil. The Technical
Specifications (Appendix B) includes a list of requirements for the geomembrane vapor
barrier, including material properties and installation methodologies, that will require review
and approval by the VIMS EOR. It is anticipated that the sprayed-seam geomembrane vapor
2 1 mil is equivalent to 0.001 inch.
Monitoring System
Subslab Venting
Layer (cont.)

GN9110/CAR230139 11 June 2024
barrier will consist of an EPRO Geo-Seal® EV40 geomembrane (described as “EV40”
herein); however, an approved equivalent may be used, as determined by the EOR.
One non-woven cushion geotextile (the “upper cushion geotextile”) will be placed over the
geomembrane vapor barrier to provide puncture protection to the geomembrane vapor barrier
during the installation of the overlying concrete slab. A second non-woven cushion geotextile
(the “lower cushion geotextile”) will be deployed directly underneath the geomembrane
vapor barrier to provide puncture protection from the underlying venting aggregate. Some
geomembrane vapor barriers, such as the EV40, are composite membranes that contain a
geotextile bonded to the base of the geomembrane vapor barrier; in this case, the bonded
geotextile serves the purpose of the lower cushion geotextile. In the instance the Contractor
elects to install a geomembrane vapor barrier without a bonded geotextile, a lower cushion
geotextile as defined in the Technical Specifications (Appendix B) will be installed.
CQA field personnel will monitor smoke testing of the geomembrane vapor barrier during
construction. Smoke testing will be completed prior to the installation of the upper cushion
geotextile, and the Technical Specifications (Appendix B) provide detail of the smoke
testing requirements. Thickness testing will not be performed because the spray application
is only to be applied at the membrane seams, penetrations, and foundation attachments.
2.8 Subslab Venting Layer Components
The purpose of the subslab venting layer is to “sweep” or “flush” vapors from under the slab
and exhaust them above the building. The subslab venting layer will include an aggregate
venting layer, vapor extraction piping, air inlet piping (community building only), and a
mitigation fan.
2.8.1 Aggregate Venting Layer
The 6-inch-thick aggregate venting layer will consist of an aggregate that meets ASTM C33
specifications, that will provide a conduit for air flow beneath the concrete slab. The venting
aggregate will be installed below the geomembrane vapor barrier and lower cushion
geotextile described in Section 2.7.
2.8.2 Extraction Piping
Subslab vapors will be extracted using 1-inch thick, 12-inch-wide vent strip that connects to
solid 4-inch Schedule 40 PVC pipes (“extraction pipe”) set within the aggregate venting
layer using a transition end outlet. The extraction pipe will be routed horizontally until it
penetrates the building’s exterior footer, after which it will transition from horizontal to
vertical, and will be routed above grade to a mitigation fan installed near grade level on the

GN9110/CAR230139 12 June 2024
building’s exterior (described in Section 2.8.4). The extraction piping will continue to be
plumbed vertically along the exterior wall of the building until it terminates at a discharge
point above the building’s roof line. Extraction piping layout and routing are presented in
the Construction Drawings (Appendix A) and design details are provided below.
One extraction riser will be installed for each building. As presented in Table 2, this
frequency is sufficient to accommodate at least 3 air exchanges of the aggregate venting layer
per hour, while maintaining a riser pipe velocity below 1,600 feet (ft) per minute to reduce
the chances for nuisance noise (ANSI/ARST 2020). Although the 3-air exchange rate was
used as a design basis, the VIMS is not required to achieve these flushing rates to demonstrate
adequate system performance. Further, pre-occupancy sampling, tentative diagnostic testing,
and operational evaluation will be completed following construction to specify the active
mitigation fans and VIMS air flow rates.
A ½-inch monitoring port will be installed on each extraction riser on the intake side of the
mitigation fan for monitoring extraction riser conditions at grade level. The monitoring port
consists of a drilled hole that is sealed with a ½-inch NPT threaded plug. A continuous
extraction riser differential pressure sensor will be installed and plumbed into each extraction
riser to monitor the mitigation fan’s static vacuum. These items are discussed further in
Section 2.9).
Extraction riser piping runs and offsets will be minimized to the extent practicable. The
extraction riser piping will be supported as dictated by the Mechanical, Electrical, Plumber
(MEP) or local building codes. Labels will be placed on extraction riser piping indicating:
“VAPOR INTRUSION MITIGATION SYSTEM: NOTIFY MAINTENANCE IN CASE
OF DAMAGE” in at least 0.5-inch lettering every 10 feet along the length of the above grade
pipe, as indicated in the Technical Specifications (Appendix B).
Drainage holes will be drilled in the elbow fittings at the horizontal to vertical transitions
below the slab, and a non-woven filter geotextile will be placed below the subslab drainage
holes to prevent the drainage holes from becoming clogged with subgrade material. Any
above ground horizontal piping will be sloped back toward the building to drain condensate
back toward the subsurface. An inline condensate collar may be placed on the exhaust piping
to collect condensate.
The discharge point of each extraction riser will be a minimum of 10 feet from building
intakes or building openings and extend a minimum of 18 inches above the eaves of the
sloped roofs.

GN9110/CAR230139 13 June 2024
2.8.3 Air Inlet Piping
Outdoor air will be distributed below the slab of the community building using 1-inch thick,
12-inch-wide vent strip that connects to solid 4-inch Schedule 40 PVC pipes (“air inlet pipe”)
set within the aggregate venting layer using a transition end outlet. The inlet pipe will be
routed horizontally until it penetrates the building’s exterior footer, after which it will
transition from horizontal to vertical, and will be routed above grade. The inlet pipe will
extend a minimum of 2-feet above grade and have a screen installed on the end to prevent
animals from entering, or other blockages. Air inlet piping layout and routing are presented
in the Construction Drawings (Appendix A).
2.8.4 Mitigation Fan
Electric powered fans will generate air flow and vacuum gradients to vent vapors from
beneath the slab and flush atmospheric air through the ventilation layer below the slab. One
extraction fan will be installed on each extraction riser pipe. The fan will be installed in-line
with the extraction piping, approximately 4 to 5 ft above grade, for long-term operation and
maintenance (O&M) of the mitigation system fans. The fan will be mounted on the building’s
exterior wall in a manner that provides sufficient support for the fan and extraction piping.
The exhaust from the fan will be routed to above the roof line.
A shut-off switch will be installed at each fan housing in a weather enclosure per applicable
building code for maintenance. Power will be supplied by individual circuit breakers to each
fan. Alarming and monitoring infrastructure for the fans is discussed in Section 2.9.
If the PD wishes to transition select buildings’ VIMS from active to passive based on
post-occupancy monitoring data and BRS approval, this would be completed by uninstalling
the mechanical mitigation fans, and replacing them with wind-driven turbines. Wind-driven
turbines rely on pressure gradients produced by the turbines (which are turned by wind) to
vent vapors from beneath the slab by flushing atmospheric air through the venting layer
below the slab. The wind-driven turbines will be made from galvanized steel construction,
mounted on top of the exhaust piping on the roof, and secured with galvanized or stainless-
steel screws. The potential wind-driven turbines are documented in the Construction
Drawings (Appendix A), Technical Specifications (Appendix B), and recommended VIMS
products (Table 1).
2.9 Monitoring System
The VIMS monitoring system installed at each building contains manual and active
monitoring components presented in the Construction Drawings (Appendix A), summarized
in Table 3, and described below:

GN9110/CAR230139 14 June 2024
• Subslab vapor monitoring probes
• Extraction riser monitoring port
• Indoor air reference monitoring port (residential units only)

• Extraction riser differential pressure sensor

2.9.1 Subslab Vapor Monitoring Probes
Subslab soil gas conditions beneath each building will be monitored manually via subslab
vapor monitoring probes. These subslab vapor monitoring probes can be used to collect
subslab soil gas samples and to monitor subslab vacuum and subslab airflow. The locations
of the proposed monitoring probes and construction details are presented in Appendix A.
In each residential unit, one subslab vapor monitoring probe will be installed at a location
distant from extraction riser inlet and at least 5 ft from the nearest exterior walls (i.e. building
envelope). This results in a monitoring frequency of 1 subslab monitoring location per 546
to 704 ft2, depending upon the residential unit type. In the community building, two subslab
vapor monitoring probes will be installed at a location distant from the extraction riser and
at least 5 ft from the nearest exterior walls. This results in an approximate monitoring
frequency of 1 subslab monitoring location per 760 ft2. The design of the subslab vapor
monitoring probes is different depending on whether they are installed in the residential units
or community building; design details are provided below.
The subslab vapor monitoring probes installed in the residential units will be used to monitor
subslab conditions remotely and will be accessible from the exterior of the building so that
the O&M contractor does not have to enter residential units to monitor the system. The
remote subslab vapor monitoring probes will consist of ¼-inch Nylaflow® tubing connected
via a compression or barbed fitting to a 6-inch stainless-steel vapor implant. The Nylaflow
tubing will be routed through solid 1-inch (minimum) Schedule 40 PVC conduits that run
beneath the slab though the venting aggregate and terminates outside of the residential unit’s
footprint. The PVC conduit will connect to a vertical PVC riser using a PVC tee. The PVC
conduit and interior monitoring tubing will terminate in a flush-mounted 8-inch diameter
well vault adjacent to the residential unit, and at a location accessible for ongoing VIMS
operations, maintenance, and monitoring. The end of the monitoring tubing within the well
vault will terminate with a ¼-inch compression fitting connected to a ball valve to allow for
monitoring. The opposite end of the monitoring tubing (located in the venting aggregate)
will contain a temporary ball valve to allow for leak testing to be completed (via a shut-in
test) prior to pouring the concrete slab. The PVC conduit will be sealed on both ends, and at
Active Monitoring
Manual Monitoring

GN9110/CAR230139 15 June 2024
each conduit joint, with polyurethane caulking per the Construction Drawings (Appendix
A).
The subslab vapor monitoring probes installed in the community building will be used to
monitor subslab conditions directly and will be accessible from inside the community
building. These subslab vapor monitoring probes will consist of a Vapor Pin® installed within
a Vapor Pin Insert, a product manufactured by Vapor Pin Enterprises. The Vapor Pin Insert
will be installed prior to pouring the foundation and allows the geomembrane vapor barrier
to be properly sealed to the Insert tube using the manufacturer’s instructions on pipe
penetration repair. The Vapor Pin Insert will be installed per the manufacturer’s standard
operation procedure. The Vapor Pins will have a barb fitting for connecting monitoring
equipment. When not in use, a secure, flush cover will be installed on the Vapor Pin to protect
it from damage.
2.9.2 Indoor Air Reference Monitoring Port
Since the access point of the residential units’ subslab vapor monitoring probes will be
located outside, indoor air refence monitoring ports will be installed at each residential unit
to allow for the measurement of the pressure differential between the indoors and the subslab.
The indoor air reference monitoring ports will consist of ¼-inch Nylaflow tubing that begins
in a monitoring panel mounted onto the exterior of the residential unit and terminates with
an open end inside of the residential unit. The Nylaflow tube will be installed within a solid
1-inch (minimum) Schedule 40 PVC conduit. The end of the Nylaflow tubing in the
monitoring panel will terminate with a ¼-inch compression fitting connected to a ball valve
to allow for monitoring. The monitoring panel consist of a weathertight enclosure installed
at an accessible location. The monitoring panel will also house the extraction riser
differential pressure sensor (Section 2.9.4).
2.9.3 Extraction Riser Monitoring Port
A ½-inch monitoring port will be installed on each extraction riser on the intake side of the
mitigation fan at grade level. The monitoring port will consist of a ½-inch NPT threaded plug
installed directly into the extraction riser pipe, at least 40 inches from where the extraction
piping below grade transitions from horizontal to vertical.
The monitoring port will be used for collecting manual measurements of air flow, static
vacuum, or air samples from the extraction pipe.

GN9110/CAR230139 16 June 2024
2.9.4 Extraction Riser Differential Pressure Sensor
One differential pressure sensor will be installed at each VIMS to monitor the static vacuum
being applied by the mechanical fan. The differential pressure sensor will be installed in a
watertight enclosure (e.g., monitoring panel) and ¼-inch vacuum tubing will be installed
between the differential pressure sensor and extraction riser. The ¼-inch vacuum tubing will
terminate on the intake side of the mitigation fan, between the fan intake and the extraction
riser monitoring port.
The differential pressure sensor will be connected to a telemetry system that will trigger if a
mitigation fan is operating below a minimum setpoint static vacuum. When triggered, an
audible/visual alarm will be activated by the telemetry system and an automatic notification
to the property owner and designated representative will be sent; both instances will indicate
that a designated representative should investigate the cause of the alarm and inspect the fan.
The telemetry system will be readily accessible.

GN9110/CAR230139 17 June 2024
3. QUALITY ASSURANCE AND QUALITY CONTROL
Quality Assurance (QA) and Quality Control (QC) measures are necessary to maintain
system integrity during construction. CQA will be conducted by qualified personnel under
the supervision of the PE who designed the VIMS (EOR). A CQA Monitoring Plan is
provided as Appendix C, within which the EOR, Contractor, and other pertinent project
team members’ roles and responsibilities are defined. BRS will be provided a minimum of
48 business hour notification prior to starting CQA.
Following construction, a final report will be prepared, as approved by the VIMS EOR, that
will include a summary of VIMS installation monitoring. Reporting is discussed further in
Section 7.

GN9110/CAR230139 18 June 2024
4. POST-CONSTRUCTION DIAGNOSTIC TESTING AND
PRE-OCCUPANCY MONITORING
Prior to occupancy, pre-occupancy methane screening, diagnostic testing, and pre-occupancy
VIMS monitoring will be completed. Details of the pre-occupancy methane screening,
diagnostic testing, and pre-occupancy monitoring are provided in this section.
4.1 Pre-Occupancy Methane Screening
To evaluate whether methane remains in soil gas and is accumulating below the building
slabs during construction and if the VIMS need to be modified to mitigate methane, two pre-
occupancy methane screening events will be completed as follows:
• Two weeks after the concrete slabs are poured, methane screening will be completed
at each residential unit and the community building.
• One month after the concrete slabs are poured, methane screening will be completed
at select buildings (buildings will be selected as described in Section 4.1.2).
Subslab soil gas will be collected and screened from subslab vapor monitoring probes and
extraction riser pipes using the methods described in Section 4.1.1 and results will be
transmitted according to Section 4.1.2.
4.1.1 Methane Screening Procedure
The subslab vapor monitoring probes and extraction riser pipes will be purged using a lung
box (or equivalent) and purged subslab soil gas will be collected in a 1-liter (L) Tedlar® bag.
Each Tedlar bag of purged subslab soil gas will be screened using a landfills gas meter and
results for methane, carbon dioxide, and oxygen will be recorded.
When screening the subslab vapor monitoring probes, Nylaflow tubing will be connected
directly from the lung box to the probe using airtight fittings. A shut-in test will be conducted
to evaluate potential leaks in the screening assembly.
When screening the extraction riser pipe, the extraction riser will not be capped and will be
open, allowing subslab soil gas to vent to the atmosphere (this is similar to the future
conditions when mechanical fans will be installed and operating at each building). The
Nylaflow tubing will be connected directly to the lung box and placed within the extraction
riser. A temporary seal will be made where the Nylaflow tubing enters the extraction riser
and purging will commence. No shut-in test will be conducted since there are no fittings in
the screening assembly and the Nylaflow tubing will be placed within the extraction riser.

GN9110/CAR230139 19 June 2024
When screening the subslab vapor monitoring probes, subslab soil gas will be purged such
that at least three times the volume of the subslab probe and sample train are purged prior to
collecting and recording final subslab soil gas measurements.
When screening the extraction riser pipe, subslab soil gas will be purged such that at least
3 L of subslab soil gas are purged and screened prior to recording final subslab soil gas
measurements.
4.1.2 Results Transmittal
A memorandum providing findings and recommendations will be prepared for each
pre-occupancy methane screening event and submitted to the BRS for review and approval
(i.e., two memorandums will be submitted).
The two-week results memorandum will include a recommendation as to whether furth
pre-occupancy methane screening is necessary for each building. The one-month screening
scope will then be adjusted with BRS approval.
The one-month results memorandum will include two recommendations: (i) whether further
pre-occupancy methane screening is necessary for each building monitored; and (ii) whether
the VIMSs for each building will need to be modified to include methane mitigation system
components.
4.2 VMS Diagnostic Testing
The objective of diagnostic testing is to evaluate the pneumatic connectivity below the slab
footprint and to specify mechanical fans. Diagnostic testing will be completed at the
community building; however, diagnostic testing may not be completed at each residential
unit due to their small footprints and uniformity of construction; however, pre-occupancy
monitoring will be completed at each residential unit as described in Section 4.2.
Diagnostic testing will include subslab pressure field extension testing, extraction riser air
flow and vacuum monitoring, and VOC monitoring at both the subslab and extraction riser.
Additionally, the CQA field monitor may check for air leakage at accessible construction
joints and floor penetrations via smoke testing, where smoke is introduced to the areas of
potential leakage and evaluated for downward migration while the diagnostic test is
occurring and a vacuum is being applied to the VIMS. The diagnostic testing will be
performed after the entire subslab portion of the mitigation system has been installed, the
concrete slab has cured, and the penetrations and joints have been sealed.

GN9110/CAR230139 20 June 2024
A combination of flow and vacuum data will be used to specify a fan that achieves the design
objective.
4.2.1 Pressure Field Extension Testing
A temporary fan will be connected to each extraction riser to exhaust gases from below the
slab. Cross-slab differential pressure will be measured and recorded during the testing at each
of the subslab monitoring locations installed within the building being tested. Since the
community building VIMS uses venting rather than pressure differentials to achieve its
design goals, vacuum may not be measurable at the subslab vapor monitoring probes even
when the system is operating effectively. If no vacuum is observed, other methods may be
employed, such as temporarily closing air inlet piping during testing to confirm pneumatic
connectivity in the subslab.
4.2.2 Flow and Vacuum Monitoring
While operating the temporary fan, the fan vacuum and airflow rate will be measured at
monitoring ports installed on the extraction piping using a thermal anemometer and static
pressure gauge. This information, along with the pressure field extension data, will be used
to evaluate pneumatic performance of VIMS components. The fan flow rate will be varied
and data will be collected at the subslab vapor monitoring probes to evaluate the effect of
fan operational changes. The information obtained by operating the mechanical fans in
various operating conditions will be used to specify a mitigation fan.
4.2.3 VOC Monitoring
During operation of the temporary fan, VOC concentrations be screened with a handheld
PID from each extraction pipe and subslab vapor monitoring probe. VOC analytical data will
not be collected during diagnostic testing, but is planned for pre-occupancy monitoring
(Section 4.2).
4.3 Pre-Occupancy Monitoring
Once mitigation fans specified by the Contractor and approved by the EOR are installed and
operating, pre-occupancy monitoring will be performed to evaluate if each VIMS is
achieving the design objectives to support building occupancy approval from the BRS. If the
construction schedule allows, the pre-occupancy monitoring will occur once each building
is substantially complete; however, pre-occupancy monitoring may occur prior to that to
meet the occupancy schedule. If pre-occupancy monitoring occurs prior to substantial
completion of the buildings, each building will, at a minimum, be completely enclosed and
the BRS will be informed of the change in pre-occupancy monitoring timing. The results of
pre-occupancy monitoring will be submitted to the BRS for review and occupancy approval,

GN9110/CAR230139 21 June 2024
as discussed in the Reporting section. The four pre-occupancy monitoring tasks are described
in the subsections below.
4.3.1 Pre-Occupancy Operational Evaluation
The pre-occupancy operational evaluation will consist of one round of operational
monitoring, during which the following data will be collected:
• Subslab to indoor air differential pressures will be measured from the subslab vapor
monitoring probes.
• Flow and static vacuum will be measured at each extraction riser.
• As needed (based on field observations and measurements), limited smoke testing
may be completed to evaluate potential slab leakage.
4.3.2 Pre-Occupancy Subslab Soil Gas Sampling
Pre-occupancy subslab soil gas samples will be collected at each building’s subslab vapor
monitoring probes while mitigation fans are operating, in accordance with the Minimum
Mitigation and Sampling Requirements for Reuse guidance document (NCDEQ 2024b) and
the DWM VI Guidance (NCDEQ 2018), as described below.
Each subslab sample will be collected with a batch-certified clean 1-L SUMMA® canister
with a 200 milliliter per minute (mL/min) flow controller. The initial SUMMA canister
vacuum will be measured prior to sample collection, and no more than 24-hours in advance,
to evaluate if canister leaks occurred during shipping. If the initial canister vacuum decreases
by more than 10% from the vacuum as measured by the analytical laboratory, the canister
will not be used for sampling.
Each SUMMA canister will be connected to the subslab vapor probe using airtight fittings
and new Nylaflow® tubing. Prior to each subslab sample collection, differential pressure
(subslab to indoor air) will be collected and a shut-in test will be conducted to evaluate
potential leaks in the sample assembly.
Following the completion of a successful shut-in test, subslab vapor monitoring probes will
be purged of three volumes (equal to the volume of the Nylaflow tubing below the slab and
the sample train tubing) using a lung box or peristaltic pump. Subslab soil gas will be purged
at a rate less than or equal to 200 mL/min and will be collected in a 1-L Tedlar bag. During
purging, helium will be introduced into a shroud that encompassed the entire sample train
and used as a tracer to check the sampling train and surface seal for leaks. The purged soil
gas will be screened for: (i) oxygen, carbon dioxide, and methane with a landfill gas meter;

GN9110/CAR230139 22 June 2024
(ii) organic vapors with a PID; and (iii) helium with a helium detector. A helium shroud will
be used as a tracer leak test to evaluate potential outdoor air entrainment into the samples.
However, commonly used helium meters (e.g., MGD-2002) indicate in the operator manual
that the presence of methane can interfere with the helium meter screening results, resulting
in false positive detections. In cases where methane is detected during the sample train purge
process, multiple lines of evidence will be used, beyond the helium tracer, to evaluate the
integrity of the seal from atmospheric air entrainment, such as the concentration of oxygen
and carbon dioxide relative to atmospheric conditions.
After sample collection, the residual vacuum of each SUMMA canister will be measured.
The targeted final vacuum for sample collection will be 5 inches of mercury (inHg) and final
canister vacuums as measured by the laboratory will be provided in analytical reports. After
sample collection, the canisters will be transported to an accredited laboratory under standard
chain of custody procedures and analyzed for VOCs plus naphthalene using Environmental
Protection Agency (EPA) Method TO-15.
A duplicate sample will be collected daily or every 20 sample locations whichever one occurs
first. Also, one outdoor air sample will be collected during each sampling mobilization.
4.3.3 Pre-Occupancy Indoor Air Sampling
Pre-occupancy indoor air monitoring will be performed concurrently with subslab sampling
at each building while mitigation fans are operating. Indoor air samples will be collected in
accordance with the Minimum Mitigation and Sampling Requirements for Reuse guidance
document (NCDEQ 2024b) and the DWM VI Guidance (NCDEQ 2018) as described below.
Each indoor air sample will be collected in the breathing zone 3 to 5 ft above the ground in
a 6-L, individually certified SUMMA canister fitted with a 24-hour flow controller. Indoor
air samples in residential units can be collected concurrently with subslab soil gas samples
because the subslab soil gas sampling ports will be routed outdoors, eliminating the potential
for excess soil gas introduced to indoor air during subslab sampling to bias indoor air sample
results. The indoor air sample collected in the community building will be collected the day
before the subslab soil gas samples are collected because the subslab probes are indoors.
Prior to deploying the 6-L SUMMA canisters, a building survey will be completed to
evaluate potential background sources that may impact indoor air quality and analytical
results.
An initial vacuum will be recorded from each canister prior to sampling; if the initial canister
vacuum has decreased by more than 10% from the vacuum as measured by the analytical
laboratory, the canister will not be used for sampling. After sample collection, the SUMMA

GN9110/CAR230139 23 June 2024
canisters’ residual vacuum will be measured and recorded in the field. The targeted final
vacuum after sample collection will be 5 inHg and final canister vacuums as measured by
the laboratory will be provided in analytical reports. After sample collection, the canisters
will be transported to an accredited laboratory under standard chain of custody procedures
and analyzed for VOCs previously detected in Site media using EPA Method TO-15. The
list of VOCs included in the indoor air analysis will be provided to the BRS prior to sampling
for review and approval.
4.3.4 Pre-Occupancy Risk-Based Screening Evaluation
Pre-occupancy sampling results will be compared to the most up-to-date NCDEQ
Residential SGSLs and indoor air IASLs at the time of sampling. Data will then be evaluated
using the most up-to-date NCDEQ Risk Calculator as described below.
The analytical results input into Risk Calculator will include the maximum concentration of
each detected compound, including estimated values ( “J flags”), and the Method Detection
Limits (MDLs) for compounds that were not detected in samples but where the MDL
exceeded the residential SGSL or IASL. Cumulative calculated screening-level cancer risks
less than 1E-4 and screening-level cumulative non-cancer hazard indices less than 1.0 are
considered acceptable as indicated in the Risk-Based Guidance (NCDEQ 2023). Further
refinement of the Risk Calculator input may occur, pending results. The pre-occupancy
sampling result and Risk Calculator output for each building will be submitted to BRS. It is
anticipated that the Risk Calculator outputs will be used to guide future post-occupancy
monitoring (e.g. monitoring frequency, monitoring locations, etc.) and operating activities
(e.g. potential to go passive) for each building.

GN9110/CAR230139 24 June 2024
5. POST-OCCUPANCY SYSTEM EFFECTIVENESS TESTING
Following occupancy approval, VIMS monitoring will be performed in general accordance
with BRS guidance documents for each residential unit and the community building. Details
of the VIMS monitoring are provided in the following subsections.
Following one year of post-occupancy VIMS monitoring, modifications to the operation and
monitoring frequency may be requested by the PD or their designated representative, pending
the data findings and approval by the BRS. Note that the monitoring procedures described
below only apply to the VIMS for mitigation of VOCs. As previously described,
modification of the VIMS to mitigate methane (if needed) will require modification of post-
occupancy system effectiveness testing and will be conducted under separate cover.
5.1 VIMS Operational Monitoring
Routine post-occupancy monthly operational monitoring will be completed at each building,
following the same processes described in Section 4.3.1.
Monthly operational data will be submitted to the BRS quarterly.
5.2 VIMS VOC Sampling
One concurrent subslab soil gas and indoor air sampling event will be completed between 6
and 12 months after occupancy in general accordance with the sample collection methods
described in Sections 4.3.2 and 4.3.3.
One subslab soil gas analytical sampling event will be completed every 5 years after
occupancy, per the Townhome Guidance (NCDEQ 2020a), in general accordance with the
sample collection methods described in Section 4.3.2.
Within 90 days of completing a subslab soil gas and/or indoor air monitoring event a
summary of the monitoring event will be submitted to the BRS. Within 14 days of receiving
indoor air analytical data, NCDEQ Risk Calculator outputs from the most up-to-date Risk
Calculator will be submitted to the BRS. If the Risk Calculator output exceeds acceptable
levels as defined in the Risk-Based Guidance (NCDEQ 2023), a resampling event will be
completed within 2 weeks of submitting the Risk Calculator output to the BRS. During the
resampling event, an inventory of chemicals stored within the building will be taken to
evaluate potential background sources.

GN9110/CAR230139 25 June 2024
5.3 Post-Occupancy Methane Screening
One post occupancy methane screening event will be completed at each building
concurrently with the first monthly operational evaluation (approximately one month after
building occupancy).
Subslab soil gas will be collected and screened from subslab vapor monitoring probes using
the same method described in Section 4.1.1.
Subslab soil gas will be collected and screened from extraction riser pipes using a modified
method as described in Section 4.1.1, since the VIMS at each building will be operating.
Nylaflow tubing will be connected directly to the lung box and inserted into the extraction
riser via the monitoring port. A temporary seal will be made around the Nylaflow tubing and
purging will commence. No shut-in test will be conducted since there are no fittings in the
screening assembly and the Nylaflow tubing will be placed within the extraction riser.
Subslab soil gas will be purged such that at least 3 L of subslab soil gas are purged and
screened prior to recording final subslab soil gas measurements.
Following completion of the post-occupancy methane screening, a summary of the event and
the results will be submitted to the BRS for review. In the submittal, two recommendations
will be included for BRS review and approval: (i) whether further post-occupancy methane
screening is necessary; and (ii) whether the VIMSs for each building will need to be modified
to include methane mitigation system components.
If methane mitigation is required by the BRS, post-occupancy methane mitigation
effectiveness testing will be required, and will be described under a separate cover, as
discussed in Section 7.

GN9110/CAR230139 26 June 2024
6. FUTURE VIMS MODIFICATIONS
The Site owner, or an authorized representative, will be responsible for property management
and day-to-day operation of the VIMS. This will include confirmation that the VIMS alarms
are operational and that work that could potentially damage components of the VIMS is not
conducted without developing a plan for approval by the BRS and in consultation with the
EOR. In the event the VIMS requires modification or repair, the work will be conducted in
general accordance with the Construction Drawings (Appendix A) and Technical
Specifications (Appendix B) and the BRS will be notified at least 48 business hours prior to
implementing the modifications, unless emergency repairs are required, in which case the
repair will be made and the BRS will be notified as soon as practicable. The VIMS
modification or repair will be completed under the supervision of the VIMS EOR or North
Carolina PE.
If future improvements require modifications to the VIMS in excess of typical slab repairs
(e.g., repairing geomembrane) and involve movement of VIMS components (e.g., rerouting
subslab vapor monitoring probes), a brief addendum report will be submitted to the BRS
documenting potential improvement activities and post-construction performance
monitoring (if deemed necessary by the VIMS EOR) for BRS review and approval. If subslab
data collected prior to improvements indicate that TCE is present in subslab soil gas above
acceptable risk-based thresholds, temporary mitigation measures (e.g., installing temporary
ventilation of the space) will be implemented prior to performing the improvements. VIMS
modifications that disturb subsurface soil will need to be conducted in accordance with an
approved environmental management plan (EMP).
Future tenants/lessees will be notified of a presence of a VIMS through the leasing
agreement. The information provided will include a description of the VIMS and pertinent
information regarding VIMS management for future improvements or subslab modifications
(consistent with the information presented herein). This document will be provided to the
BRS for review prior to Building occupancy.

GN9110/CAR230139 27 June 2024
7. REPORTING
Assessment, mitigation, and monitoring results will be summarized and submitted to the
BRS for review and approval. Details of the submittals are provided below:
• Pre-Occupancy Methane Screening Results: Two memorandums will be submitted
to the BRS for review and approval summarizing results from the two-week and
one-month post-slab pour methane screening, as described in Section 4.1.2. Each
memorandum will include a recommendation as to whether further pre-occupancy
methane screening should occur at each building. The one-month memorandum will
also include a recommendation as to which buildings, if any, will need to be modified
to include methane mitigation system components.
• Pre-Occupancy Monitoring: Results from the pre-occupancy monitoring, including
operational evaluation, subslab soil gas sampling, and indoor air sampling will be
submitted to the BRS for review and approval. Depending on timing, the
pre-occupancy monitoring results may be submitted with the Construction
Completion Report discussed below.
• Post-Occupancy Methane Screening: Results from the post-occupancy methane
screening will be submitted to the BRS for review and approval, as described in
Section 5.3. The results submittal will include a recommendation as to which
buildings, if any, will receive methane mitigation components.
• Contingent Methane Mitigation Design: Based on the methane assessment results
described in Section 1.4, methane is unlikely to be present in soil gas at
concentrations requiring mitigation. However, based on results from the pre- and
post-occupancy methane screening events, the BRS may require that select VIMS be
modified to mitigate methane in general accordance with the BRS Methane Guidance
(NCDEQ 2020b). If the BRS requires methane mitigation, details of the
modifications to the VIMS design (e.g., methane monitoring equipment), CQA
monitoring, pre-occupancy monitoring, post-occupancy effectiveness testing, and
reporting will be provided in an addendum to this Design Report for the BRS to
review and approve.
• Construction Completion Reporting: Within 90 days of completion of pre-occupancy
monitoring or completion of VIMS construction (whichever comes last), a report
summarizing the installation monitoring, QA/QC measures, and notable deviations
from the design will be submitted to the BRS. The report will also provide an opinion
of whether the VIMS was delivered in a condition consistent with the Construction
Documents, which is designed to mitigate public exposure to VOCs (and potentially

GN9110/CAR230139 28 June 2024
methane) within acceptable levels. The report will include field monitoring
documentation (field logs and photographs) and as-built drawings as appendices. If
appropriate, Safety Data Sheets for construction materials used near ground surface
that might contribute to background interference will be included as an appendix. The
report will include the PE statement (Section 9), be signed and sealed by the EOR
(Licensed in North Carolina), and submitted to the BRS for review and approval.
• OM&M Plan: A description of the OM&M Plan that will be submitted to the BRS is
provided in Section 8.

GN9110/CAR230139 29 June 2024
8. OPERATIONS, MAINTENANCE, AND MONITORING PLAN
An OM&M Plan will be developed and is anticipated to be submitted prior to occupancy of
the residential units and community building. The OM&M Plan will be submitted at least 30
days prior to occupancy.
The OM&M Plan will be provided for implementation by the Site owner (and/or their
authorized representative) and will include documentation of the as-built systems (as
provided by the Contractor), product information and manuals for the components, and
OM&M requirements for the VIMS in the instance there are future modifications to the
building and/or slab. The objective of the OM&M Plan will be to provide recommendations
for effective ongoing system operation and monitoring, which will include the inspection
process for the first-floor slab, mitigation fans, and support equipment, procedures for
collecting field screening data from the various VIMS monitoring components, and a
recommended reporting frequency. If methane mitigation is required, the OM&M Plan will
also include recommended frequencies for calibrating and replacing methane sensors.
An example OM&M form is provided in Appendix G showing the types of monitoring data
that may be collected; this OM&M form is not Site-specific and is not planned for use at the
Site. Site-specific OM&M form(s) will be developed for this Site and will be included in the
OM&M Plan.

GN9110/CAR230139 30 June 2024
9. PROFESSIONAL ENGINEER STATEMENT
The Vapor Intrusion Mitigation System (VIMS) detailed herein is designed to mitigate the
intrusion of subsurface vapors into building features in accordance with the most recent and
applicable DWM Vapor Intrusion Guidance, Interstate Technology & Regulatory Council
(ITRC) guidance, and American National Standards Institute (ANSI)/American Association
of Radon Scientists and Technologists (AARST) standards, or alternative standards
approved in writing in advance by DEQ, and that a professional engineer licensed in North
Carolina, as evidenced by said engineer’s professional seal, is satisfied that the system has
been designed so as to be fully protective of public health within the meaning of NCGS
130A-310.32 (a)(2), from known Brownfields Property contaminants.

GN9110/CAR230139 31 June 2024
10. REFERENCES
ANSI/ARST, 2020. Radon Mitigation Standards for Multifamily Buildings, RMS-MF 2018
with 12/20 revisions prepared by AARST Consortium On National Radon Standards.
2020.
WithersRavenel, 2022. Phase II Environmental Site Assessment, Buzzard Rock LLC
Property, 1.92-acre Site, Sawmill Hollow Road, Burnsville, Yancey County, NC
28714 WR Project No. 08210844.00. January 2022.
Geosyntec Consultants, 2022. Supplemental Assessment Report, Site: Sawmill Village
Brownfields Redevelopment Sawmill Hollow Road, Burnsville, North Carolina
28714. December 2022.
Geosyntec Consultants, 2023a. Woody Debris and Soil Characterization Work Plan:
Sawmill Village Brownfields Redevelopment Sawmill Hollow Road, Burnsville,
North Carolina 28714. April 2023.
Geosyntec Consultants, 2023b. Environmental Management Plan (EMP), Site: Sawmill
Village Brownfields Redevelopment Sawmill Hollow Road, Burnsville, North
Carolina 28714. June 2023.
Geosyntec Consultants, 2024a. Methane Assessment Work Plan: Sawmill Hollow Property,
Sawmill Hollow Road, Burnsville, North Carolina 28714. January 2024.
Geosyntec Consultants, 2024b. Summary of Methane Assessment, Site: Sawmill Village
Brownfields Redevelopment, Sawmill Hollow Road, Burnsville, North Carolina
28714, NCDEQ BRS Project No. 26015-22-100. May 2024.
Los Angeles Department of Building and Safety (LADBS), 2010. Methane Hazard
Mitigation Measures Standard Plan. Rev. March 2010.
NCDEQ,2020a. North Carolina Brownfields Program Minimum Requirements for
Townhome Developments. May 2020.
NCDEQ, 2020b. Threshold Criteria for Methane Site Development. December 2020.
NCDEQ, 2023. Revised Technical Guidance for Risk-Based Environmental Remediation of
Sites. January 2023.

GN9110/CAR230139 32 June 2024
NCDEQ, 2024a. Vapor Intrusion Mitigation System (VIMS) Design Submittal Requirements.
May 2024.
NCDEQ, 2024b. Brownfields Program. Minimum Mitigation and Sampling Requirements
for Reuse. May 2024.

TABLES
Manufacturer Product Name/Number
Geomembrane Vapor Barrier Vapor Barrier EPRO Services, Inc.
Upper Cushion Geotextile Protective Layer Above Geomembrane CETCO Ultrashield G-1000
Lower Cushion Geotextile2 Protective Layer Below Geomembrane SKAPS GE-160
Mitigation Fan Active Mitigation Fan RadonAway RP145
Differential Pressure Sensor Measure Static Vacuum at Extraction Riser OBAR GBR25-T
Wireless Transmitter Transmits Static Vacuum Measurement to the
Control Panel OBAR EDG 0-10V sensor
Wind Turbine Passive System Empire TV04G
Notes:
1. The vapor intrusion mitigation system (VIMS) products listed in this table are recommendations and Engineer of Record (EOR) approved equivalent products may be used.
3. Passive system fans are not included in the initial VIMS design. They are provided in anticipation of future requests for modifying VIMS operation.
2. If the EV40 geomembrane vapor barrier is used, a separate lower cushion geotextile is not required because the EV40 geomembrane includes one in the product.
Telemetry System OBAR EDG Cellular Gateway
Table 1 - Recommended VIMS Products
Vapor Intrusion Mitigation System Design Report
Sawmill Hollow Brownfields Property - Burnsville, North Carolina
Brownfields Project No. 26015-22-100
VIMS Component Function (or Equivalent)1
1 of 1
Variable Unit Residential Unit C Residential Unit F Residential Unit G Residential Unit H Community Building
Number of Proposed Buildings --6 10 8 2 1
Approximate Building Area square foot 546 704 700 700 1,513
Venting Aggregate Void Volume cubic feet 90 116 116 116 250
Riser Diameter inches 4 4 4 4 6
Design Air Exchanges per Hour --3 3 3 3 3
Maximum Riser Air Velocity feet per minute 1,600 1,600 1,600 1,600 1,600
Maximum Riser Air Flow Rate cubic feet per minute 140 140 140 140 140
cubic feet per hour 270 348 347 347 749
cubic feet per minute 5 6 6 6 13
Number of Risers Required for
Maximum Riser Air Velocity --1 1 1 1 1
Air Flow Rate per Riser cubic feet per minute 5 6 6 6 13
Notes:
Table 2 - Design Air Exchange Rates
Vapor Intrusion Mitigation System Design Report
Sawmill Hollow Brownfields Property - Burnsville, North Carolina
Brownfields Project No. 26015-22-100
Design Air Flow Rate
(3 Air Exchanges per Hour)
1. The Venting Aggregate Void Volume is calculated assuming a 6-inch thick aggregate layer with a porosity of 0.33 below the entire building footprint.
2. The Design Air Exchanges per Hour presented in this table served as the basis for design of the vapor intrusion mitigation system (VIMS).
3. The Design Air Flow Rate is calculated by multiplying the Design Air Exchanges per Hour by the Venting Aggregate Void Volume.
1 of 1
Building Type Residential Unit C Residential Unit F Residential Unit G Residential Unit H Community Building
Building Area (ft2)546 704 700 700 1,513
Number of Air Inlets 0 0 0 0 1
Number of Subslab Vapor Monitorin Probes 1 1 1 1 2
Number of Extraction Riser Monitorin Ports 1 1 1 1 1
Number of Indoor Air Reference Monitoring Port 1 1 1 1 --
Number of Continuous Extraction Riser
Differential Pressure Sensor 1 1 1 1 1
Notes:
2. -- indicates that indoor air pressure reference ports will not be installed in the community building because Vapor Pins® will be installed within the building's footprint.
ft2: square feet
Table 3 - Monitoring System
Vapor Intrusion Mitigation System Design Report
Sawmill Hollow Brownfields Property - Burnsville, North Carolina
Brownfields Project No. 26015-22-100
Building Footprint
Manual Monitoring1
Active Monitoring1
1. Manual and active monitoring components will be installed at each residential units and the community building.
1 of 1

FIGURES
\\Raleigh-01\PRJ\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\202307_VIMS Design\F1_Site Location Map.mxd 7/26/2023 5:08:48 PM NC
0 1,000Feet
³Sawmill Hollow Brownfields PropertyBrownfields Project No: 26015-22-100Burnsville, North Carolina
Site Location Map
Figure
1Asheville, NC June 2024
Legend
Notes:1. Base map from USGS National Topogrpahpic Map.2. Parcel Boundary Data from Yancey County GIS.
Site Location
^_
Site Location
Sa
w
m
i
l
l

H
o
l
l
o
w

R
o
a
d
US High
w
a
y

1
9
E
Horizo
n

D
r
i
v
e
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit FUnit F
Unit H
Unit F
Unit F
Unit H
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit C
Unit C
Unit C
Unit C
Unit C
Unit C
\\Raleigh-01\PRJ\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\202307_VIMS Design\F4_Proposed Redevelopment.mxd 9/1/2023 8:52:28 AM EHoward
Legend
³Proposed Redevelopment Plan
Figure
2Raleigh, NC June 2024
>
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!(
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!(
!(
Sawmill Ho
llow Road
US Highway 19E
Fair Haven Drive
SG-04
SG-05
SG-03
SG-02
SG-01
SG-08
SG-06
SG-07
SG-09
SG-10
Unit H
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit H
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit C
Unit C
Unit C
Unit C
Unit F
Unit C
Unit C
VP-1
VP-3
VP-4
VP-2
VP-5
\\Raleigh-01\PRJ\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\202307_VIMS Design\F2_Soil Gas Results Map.mxd 9/1/2023 8:47:37 AM
Sawmill Hollow Road
Burnsville, North Carolina
Proposed Redevelopment Plan and
Soil Gas Sampling Results
0 50
Feet
³Figure
3Asheville, NC June 2024
Legend
Site Boundary
Proposed Community Center
Proposed Housing Unit
Proposed Road
!(Soil Gas Sample Location
>Historical Soil Vapor Probe
>Historical Off-Site Soil Vapor
Probe
Notes:
1. Parcel boundary from Yancey County GIS.
2. Only presenting results for tetrachloroethene (PCE), trichloroethene (TCE), or compounds with a detection greater than its
respective Residential Vapor Intrusion Screening Level (VISL) in at least one sample.
3. Orange shading indicates compound detected above its Residential VISL.
4. Italics indicates compound was not detected and had a reporting limit above its Residential VISL.
5. Laboratory Reporting Limits presented for compounds not detected.
6. NA indicates that VP-2, VP-3, VP-4, and VP-5 were not analyzed for naphthalene.
7. Results are presented in micrograms per cubic meter (µg/m3).
8. Basemap from Source: Esri, Maxar, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID, IGN, and
1,3-Butadiene 3.1
Benzene 12
Ethyl Benzene 37
m,p-Xylene 600
Naphthalene 2.8
Tetrachloroethene 280
Trichloroethene 14
Residential SGSL
1,3-Butadiene 2.5 U
Benzene 3.6
Ethyl Benzene 4.9 U
m,p-Xylene 4.9 U
Naphthalene 12 U
Tetrachloroethene 7.6 U
Trichloroethene 6.0 U
9/21/2022
SG-01
1,3-Butadiene 2.5 U
Benzene 3.7
Ethyl Benzene 2.2 J
m,p-Xylene 5.8
Naphthalene 12 U
Tetrachloroethene 7.8 U
Trichloroethene 6.2 U
SG-03
9/21/2022
1,3-Butadiene 3.5 U
Benzene 140
Ethyl Benzene 9.2
m,p-Xylene 21
Naphthalene 3.1 J
Tetrachloroethene 11 U
Trichloroethene 8.4 U
SG-04
9/21/2022
1,3-Butadiene 14 U
Benzene 18 J
Ethyl Benzene 39
m,p-Xylene 41
Naphthalene 65 U
Tetrachloroethene 42 U
Trichloroethene 33 U
9/21/2022
SG-05
1,3-Butadiene 3 U
Benzene 7.0
Ethyl Benzene 2.6 J
m,p-Xylene 8.4
Naphthalene 14 U
Tetrachloroethene 9.3 U
Trichloroethene 6.2 J
1,3-Butadiene 3 U
Benzene 6.9
Ethyl Benzene 2.8 J
m,p-Xylene 7.6
Naphthalene 14 U
Tetrachloroethene 9.2 U
Trichloroethene 2.0 J
SG-06 Duplicate
9/21/2022
SG-06
1,3-Butadiene 2.7 U
Benzene 1.5 J
Ethyl Benzene 5.3 U
m,p-Xylene 2.7 J
Naphthalene 13 U
Tetrachloroethene 8.3 U
Trichloroethene 6.6 U
SG-07
9/21/2022
1,3-Butadiene 2.5 U
Benzene 3.6 U
Ethyl Benzene 4.9 U
m,p-Xylene 4.9 U
Naphthalene 12 U
Tetrachloroethene 7.7 U
Trichloroethene 6.1 U
SG-08
9/21/2022
1,3-Butadiene 2.4 U
Benzene 9.2
Ethyl Benzene 3.5 J
m,p-Xylene 10
Naphthalene 12 U
Tetrachloroethene 3.4 J
Trichloroethene 5.9 U
SG-09
9/21/2022
1,3-Butadiene 2.6 U
Benzene 3.3 J
Ethyl Benzene 2.2 J
m,p-Xylene 5.0 J
Naphthalene 12 U
Tetrachloroethene 7.8 U
Trichloroethene 6.2 U
SG-10
9/21/2022
1,3-Butadiene 0.58
Benzene 14
Ethyl Benzene 22
m,p-Xylene 94
Naphthalene NA
Tetrachloroethene 1.4 U
Trichloroethene 1.1 U
VP-2
12/7/2021
1,3-Butadiene 3.2 U
Benzene 74
Ethyl Benzene 170
m,p-Xylene 880
Naphthalene NA
Tetrachloroethene 1.8 J
Trichloroethene 7.9
VP-3
12/7/2021
1,3-Butadiene 2.3 U
Benzene 53
Ethyl Benzene 130
m,p-Xylene 680
Naphthalene NA
Tetrachloroethene 7.0 U
Trichloroethene 5.6 U
VP-4
12/7/2021
1,3-Butadiene 13
Benzene 74
Ethyl Benzene 67
m,p-Xylene 320
Naphthalene NA
Tetrachloroethene 15 U
Trichloroethene 12 U
VP-5
12/7/2021
1,3-Butadiene 2.6 U
Benzene 3.7 U
Ethyl Benzene 5.0 U
m,p-Xylene 5.0 U
Naphthalene 12 U
Tetrachloroethene 1.7
Trichloroethene 6.3
SG-02
9/21/2022
>
>
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Sawmill Hollow Road
US Highway 19E
Fair Haven Drive
SG-04
SG-05
SG-03
SG-02
SG-01
SG-08
SG-06
SG-07
SG-09
SG-10
Unit H
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit F
Unit H
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit G
Unit C
Unit C
Unit C
Unit C
Unit F
Unit C
Unit C
VP-1
VP-3
VP-4
VP-2
VP-5
\\Raleigh-01\PRJ\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\202307_VIMS Design\F3_Methane Screening Results.mxd 9/1/2023 8:49:03 AM
Sawmill Hollow Road
Burnsville, North Carolina
Proposed Redevelopment Plan
and Methane Results
0 50
Feet
³Figure
4Asheville, NC June 2024
Legend
Site Boundary
Proposed Community Center
Proposed Housing Unit
Proposed Road
!(Soil Gas Sample Location
>Historical Soil Vapor Probe
>Historical Off-Site Soil Vapor
Probe
Notes:
1. Parcel boundary from Yancey County GIS.
2. Methane screening results and initial pressure measurements collected using GEM 5000 ladfill gas meter.
3. Initial pressure measurements collected using a Dwyer Series 475-3-FM manometer prior to purging. Methane
screening results collected using a GEM 5000 landfill gas meter.
4. Basemap from Source: Esri, Maxar, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AeroGRID,
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-01 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-02 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-03 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-04 0.0 1.3
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-05 0.0 5.1
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-06 0.0 1.2
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-07 0.0 0.3
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-08 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-09 0.0 0.4
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG-10 0.0 0.0

APPENDIX A

Construction Drawings
G001
COVER
PREPARED FOR: 161 NORTH LEXINGTON AVE,
ASHEVILLE, NORTH CAROLINA 28801 USA
TEL: [phone]
NORTHWESTERN HOUSING ENTERPRISES
PREPARED BY:
LOCATION MAP
VICINITY MAP
PROJECT DATA:
PROJECT LOCATION:
SAWMILL HOLLOW RD
BURNSVILLE NORTH CAROLINA, 28714
APN:
083003234813000
ZONING:
N/A
EXAMPLE:DETAIL NUMBER 2 PRESENTED ON SHEET NO. EV-05 WAS REFERENCED ON SHEET NO.
EV-07.
NOTE:ABOVE REFERENCING SYSTEM ALSO APPLIES TO SECTION IDENTIFICATIONS.
DETAIL IDENTIFICATION LEGEND
02
SCALE: 1" = 1'
DETAIL
TITLE OF DETAILEV-07DRAWING ON WHICH ABOVE
DETAIL WAS REFERENCED
02
EV-05
DETAIL IDENTIFICATION
DRAWING ON WHICH ABOVE
DETAIL IS PRESENTED
REGIONAL MAP
SITE
WORK AREA
SITE
SAWMILL VILLAGE-VAPOR INTRUSION
MITIGATION SYSTEM (VIMS) DESIGN DRAWINGS
SAWMILL HOLLOW RD BURNSVILLE, NORTH CAROLINA 28715
JUNE 2024
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
CO
N
S
T
R
U
C
T
I
O
N
DO
C
U
M
E
N
T
S
Job Number:
Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
C:
\
_
G
E
O
P
W
\
D
S
0
1
\
D
M
S
1
8
9
7
0
\
G
N
9
1
1
0
.
0
2
-
G
0
0
1
MB/MR
SB
MJ
TC
75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-G001.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
LIST OF DRAWINGS
DRAWING
NUMBER DRAWING TITLE
G001 COVER
V101 PLAN VIEW - COMMUNITY BUILDING
V102 PLAN VIEW - RESIDENTIAL UNITS
V201 VAPOR INTRUSION MITIGATION DETAILS I
V202 VAPOR INTRUSION MITIGATION DETAILS II
V203 VAPOR INTRUSION MITIGATION DETAILS III
V301 VAPOR INTRUSION MITIGATION DETAILS IV
V302 VAPOR INTRUSION MITIGATION DETAILS V
EL. ELEV ELEVATION
DIA, Ø DIAMETER
LF LINEAR FEET
Mil THOUSANDTHS OF AN INCH
MIN.MINIMUM
NTS NOT TO SCALE
O.C. ON CENTER
O.D. OUTER DIAMETER
oz/sy OUNCE PER SQUARE YARD
Typ TYPICAL
ABBREVIATIONS
DETAIL NUMBER
EEEEEEEEEEEEEEEEEE
A A
A
A
A A A A A A
A
A
A A A A
A
A A A
A
A A A A A
A A A A A A A A A A A A A A A A A A A A
SE SE
SE
SA SA SA
SA
SA
SA
SA SA
EXTERIOR
BREEZEWAY
6
V201
6
V201
4
V201
4
V201
6
V201
2
V201
5
V201
1
V201
05
V201
2
V201
7
V201
6
V201
16
V201
2
V201
3
V201
8
V201
2
V201
1-FT MAX
(TYP)
3-FT MIN EXTRACTION
VENT STRIP
NOTE 4
NOTE 4
IAS-CB-01
AI-CB-01
SSP-CB-01
SSP-CB-02
IAS-CB-02
E
ER-CB-01
5-FT MIN
V101
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
CO
N
S
T
R
U
C
T
I
O
N
DO
C
U
M
E
N
T
S
Job Number:
Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
C:
\
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G
E
O
P
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D
S
0
1
\
D
M
S
1
8
9
7
0
\
G
N
9
1
1
0
.
0
2
-
V
1
0
1
MB/MR
SB
MJ
TC
75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-V101.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
PLAN VIEW - COMMUNITY
BUILDING
C:
\
_
G
E
O
P
W
\
D
S
0
1
\
D
M
S
1
8
9
7
0
\
G
N
9
1
1
0
.
0
2
-
V
1
0
1
0 5 10
SCALE IN FEET
LEGEND
EXTRACTION RISER PIPE (4" SCH 40 PVC)
EXTRACTION VENT STRIP (1" X 12")
SOLID EXTRACTION PIPE (4" SCH 40 PVC)
SUBSLAB MONITORING PROBE
CONTINGENT INDOOR AIR METHANE SENSOR
AIR INLET (4" SCH 40 PVC)
AIR INLET VENT STRIP (1" X 12")
SOLID AIR INLET PIPE (4" SCH 40 PVC)
TELEMETRY SYSTEM AND/OR
CONTINGENT METHANE DETECTION SYSTEM
MITIGATED FOOTPRINT
A A
E E
SE
SA
NOTES:
1. TELEMETRY SYSTEM AND/OR CONTINGENT METHANE
DETECTION SYSTEM IS SHOWN AT AN APPROXIMATE
LOCATION. ACTUAL LOCATION TO BE DETERMINED BY
OWNER.
2.THE GEOMEMBRANE VAPOR BARRIER SHALL COVER THE
FULL EXTENT OF THE MITIGATED FOOTPRINT.
3.FRAMEWORK, INTERIOR WALLS, AND FOUNDATION
FEATURES ARE FROM STRUCTURAL DRAWINGS
(COMPLETED BY OTHERS).
4.AIR INLET VENT STRIP SHALL BE INSTALLED APPROXIMATELY
EQUAL DISTANCES FROM THE EXTRACTION VENT STRIP.
20
V203 OR
4
V201
21
V203 OR 22
V203
3
V201
34
V302
28
V301
33
V302
4
V201
3
V201
24
V301
26
V301
E
E
E
E
E
E
SE
EXTERIOR
EXTERIOR
1
V201
2
V201
4
V201
8
V201
5
V201
18
V202
18
V202
SSP-RU-##
IAS-RU-##
ER-RU-##
3-FT MIN
20-FT MIN
5-FT MIN
SE
EXTERIOR
1
V201
5-FT MIN
5-FT
MIN EXTERIOR
E
E
E
E
E
E
5
V201
18
V202
8
V201
18
V202 4
V201
2
V201
SSP-RU-##
IAS-RU-##
ER-RU-##
3-FT MIN
20-FT MIN
E
E
E
E
E
E
EXTERIOR
EXTERIOR
1
V201
2
V201
4
V201
5
V201 18
V202
IAS-RU-##ER-RU-##
SSP-RU-##
18
V202
SE
8
V201
3-FT
MIN
20-FT MIN
5-FT MIN
5-FT MIN
SE
E
E
E
E
E
E
EXTERIOR
EXTERIOR
1
V201
2
V201
18
V202
4
V201
18
V202
5
V201
IAS-RU-##
ER-RU-##
SSP-RU-##
3-FT MIN
8
V201
20-FT MIN
5-FT
MIN
V102
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
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Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
C:
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0
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1
1
0
.
0
2
-
V
1
0
2
MB/MR
SB
MJ
TC
75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-V102.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
PLAN VIEW - RESIDENTIAL
UNITS
C:
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0
.
0
2
-
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1
0
2
LEGEND
EXTRACTION RISER PIPE (4" SCH 40 PVC)
EXTRACTION VENT STRIP (1" X 12")
SOLID EXTRACTION PIPE (4" SCH 40 PVC)
REMOTE SUBSLAB MONITORING ACCESS MANHOLE
REMOTE SUBSLAB MONITORING CONDUIT (1" SCH PVC)
REMOTE SUBSLAB MONITORING TERMINATION
CONTINGENT INDOOR AIR METHANE SENSOR
MITIGATED FOOTPRINT
UNIT C 0 5 10
SCALE IN FEET
0 5 10
SCALE IN FEET
0 5 10
SCALE IN FEET
0 5 10
SCALE IN FEET
UNIT G UNIT H
UNIT F
E E
SE
20
V203 OR
4
V201
21
V203 OR 22
V203
3
V201
18
V202
28
V301
18
V202
18
V202
NOTES:
1.THE GEOMEMBRANE VAPOR BARRIER SHALL COVER THE FULL
EXTENT OF THE MITIGATED FOOTPRINT.
2.FRAMEWORK, INTERIOR WALLS, AND FOUNDATION ARE FROM
STRUCTURAL DRAWINGS (COMPLETED BY OTHERS).
3.REMOTE SUBSLAB MONITORING TERMINATION REPRESENTS THE
LOCATION OF THE STAINLESS STEEL IMPLANT BELOW THE SLAB.
4.SUBSLAB MONITORING PROBE ID'S WILL BE BASED ON THE
NUMBER OF THE UNIT, ONCE CONSTRUCTED. FOR EXAMPLE, THE
SUBSLAB MONITORING PROBE INSTALLED AT RESIDENTIAL UNIT 10
WILL HAVE AN ID OF SSP-RU-10.
LC
CONCRETE SLAB (BY OTHERS)
GEOMEMBRANE VAPOR BARRIER
NON-WOVEN CUSHION GEOTEXTILE
6" VENTING AGGREGATE
SUBGRADE(BY OTHERS)
THICKENED SLAB FOOTING
(BY OTHERS)
LC
CONCRETE SLAB (BY OTHERS)
GEOMEMBRANE VAPOR BARRIER
NON-WOVEN CUSHION GEOTEXTILE
6" VENTING AGGREGATE
SUBGRADE(BY OTHERS)
THICKENED SLAB FOOTING
(BY OTHERS)
VENT STRIP (1-INCH X 12-INCH)
LC
NOTES:
1.A MINIMUM OF 6-INCHES CONTINUOUS SEAL TO CONCRETE REQUIRED
PER GEOMEMBRANE VAPOR BARRIER MANUFACTURER.
2.REFER TO STRUCTURAL DRAWINGS FOR REINFORCING OF WALLS,
FOUNDATION, ETC.
FINISH GRADE OR EXTERIOR SLAB
STUD WALL (BY OTHERS)
CONCRETE SLAB (BY OTHERS)
CMU PIER - SEE STRUCTURAL PLANS
6" MIN (NOTE 1)
FACE OF CMU
CMU WALL (BY OTHERS)
CONCRETE SLAB (BY OTHERS)
NOTES:
1.IF PIPE SLEEVE IS REQUIRED FOR VIMS PIPE THROUGH CMU WALL, PIPE SLEEVE
SHALL BE INSTALLED PER THE REQUIREMENTS OF THE STRUCTURAL ENGINEER.
SEAL ANNULAR SPACE OF PIPE SLEEVE WITH LINK SEAL OR EQUIVALENT.
2.NON-WOVEN FILTER GEOTEXTILE ONLY REQUIRED BELOW DRAIN HOLES.
PIPE TRANSITION ADAPTOR (PER VENT STRIP MANUFACTURER)
VENT STRIP (1-INCH X 12-INCH)
1
V201
1-FT MIN ON EITHER SIDE
OF DRAIN HOLES
PIPE BOOT SEAL PER PROJECT DOCUMENTS
FINISH GRADE OR EXTERIOR SLAB
4" DIA SCH. 40 PVC PIPE, LAY FLAT WITH 2 X 5/8" DIAMETER
DRAIN HOLES POINTING DOWN ON 3" CENTERS
NON-WOVEN FILTER GEOTEXTILE (NOTE 2)
4" DIA. SCH40 PVC PIPE
(SOLID WALL)
PIPE TRANSITION ADAPTOR (PER
VENT STRIP MANUFACTURER)
VENT STRIP
(1-INCH X 12-INCH)
GEOMEMBRANE VAPOR BARRIER
NON-WOVEN CUSHION GEOTEXTILE
6" VENTING AGGREGATE
SUBGRADE (BY OTHERS)
6" MIN.
OVERLAP 60 MIL SPRAY-APPLIED SEAM
PER GEOMEMBRANE VAPOR
BARRIER MANUFACTURER
NOTES:
1.UPPER CUSHION GEOTEXTILE NOT SHOWN.
CONCRETE SLAB (BY OTHERS)
NON-WOVEN CUSHION GEOTEXTILE
GEOMEMBRANE VAPOR BARRIER
NON-WOVEN CUSHION GEOTEXTILE
6" VENTING AGGREGATE
SUBGRADE (BY OTHERS)
2" (MIN.)
2" (MIN.)
1
V201 4" DIA. SCH. 40 PVC PIPE
NON-WOVEN FILTER GEOTEXTILE (NOTE 1)
1' MIN
NOTES:
NON-WOVEN FILTER GEOTEXTILE ONLY REQUIRED BELOW DRAIN
HOLES AND SHALL EXTEND AT LEAST 2 FEET ALONG LENGTH OF THE
PIPE (MIN OF 1 FOOT ON BOTH SIDES OF THE DRAIN HOLES).
1
V201
12"
VENT STRIP (1 -INCH X 12 -INCH)
UTILITY WIRE
NOTES:
1.CLOSED CELL CONDUIT SEALANT EXPANDING FOAM SHALL BE
INSTALLED WITHIN OR BELOW THE BOTTOM OF THE SLAB.
CONDUIT SEALANT
DRY UTILITY CONDUIT
PENETRATION
SUBGRADE (BY OTHERS)
1
V201
6" (MIN.)
3" (MIN.)
CONDUIT OR PIPE PENETRATION
NYLON OR POLYPROPYLENE CABLE TIE, TAPE, OR
SPRAY SEAL 2" MIN, ABOVE BASE PENETRATION
OR AS PER GEOMEMBRANE VAPOR BARRIER
MANUFACTURER'S RECOMMENDATIONS
GAS TIGHT BOOT (SEE NOTE 1)
3" MINIMUM COLLAR
EXTENDS INTO
CONCRETE
NOTES:
1.WHERE FOOTINGS, PLUMBING PIPES, ELECTRICAL CONDUITS OR OTHER MATERIALS
PENETRATE THE GEOMEMBRANE VAPOR BARRIER, THE PENETRATIONS SHALL BE SEALED
USING SLEEVES OR BOOTS COMPOSED OF THE SAME MATERIAL AND SEALED IN
ACCORDANCE WITH THE GEOMEMBRANE VAPOR BARRIER MANUFACTURER
RECOMMENDATIONS OR OTHER METHODS AS MAY BE APPROVED BY THE ENGINEER.
1
V201
V201
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
CO
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Job Number:
Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
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1
0
.
0
2
-
V
2
0
1
MB/MR
SB
MJ
TC
75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-V201.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
1
SCALE: NOT TO SCALE
DETAIL
TYPICAL GEOMEMBRANE VAPOR BARRIERV201
10
SCALE: NOT TO SCALE
DETAIL
CONDUIT SEALANT AT DRY PIPE PENETRATIONV201
VAPOR INTRUSION MITIGATION
DETAILS I
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0
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-
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2
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1
6
SCALE: NOT TO SCALE
DETAIL
GEOMEMBRANE VAPOR BARRIER
BELOW THICKENED FOOTING
V201 7
SCALE: NOT TO SCALE
DETAIL
VENT STRIP BELOW LOAD BEARING WALL
FOOTING
V201
2
SCALE: NOT TO SCALE
DETAIL
TYPICAL GEOMEMBRANE VAPOR BARRIER
TERMINATION AT EXTERIOR SLAB EDGE
V201
01
V201
11
SCALE: NOT TO SCALE
DETAIL
TYPICAL GEOMEMBRANE VAPOR BARRIER
PIPE PENETRATION
V201
5
SCALE: NOT TO SCALE
DETAIL
EXTRACTION RISER OR AIR INLET
PENETRATION BELOW GRADE
V201
3
V201
22
V203
21
V203
20
V203
33
V302
ACTIVE VIMS FAN
CONTINGENT ACTIVE METHANE MITIGATION FAN
PASSIVE EXTRACTION RISER
TYPICAL AIR INLET TERMINATION
4
SCALE: NOT TO SCALE
DETAIL
SUBSLAB VENT STRIP SYSTEM DETAILV201
8
SCALE: NOT TO SCALE
DETAIL
PLAN VIEW - TYPICAL VENT
STRIP TO PIPE CONNECTION
V201
9
SCALE: NOT TO SCALE
DETAIL
TYPICAL GEOMEMBRANE VAPOR
BARRIER OVERLAP
V201
3
SCALE: NOT TO SCALE
DETAIL
TYPICAL GEOMEMBRANE VAPOR BARRIER
WITH PIPING
V201
OR
OR
OR
NOTES:
1.A MINIMUM 6 INCH CONTINUOUS SEAL TO CONCRETE
REQUIRED PER GEOMEMBRANE VAPOR BARRIER
MANUFACTURER.
2.REFER TO STRUCTURAL DRAWINGS FOR REINFORCING OF
WALLS, FOUNDATION, ETC.
5" (MIN) PIPE SLEEVE PER THE
REQUIREMENTS OF THE
STRUCTURAL ENGINEER 6" MINIMUM (NOTE 1)
EXTERIOR BREEZEWAY
2X 5/8" DIAMETER DRAIN HOLES
POINTING DOWN ON 3" CENTERS
SEAL ANNULAR SPACE
BETWEEN VIMS PIPE AND
PIPE SLEEVE (TYP)
SEAL ANNULAR SPACE
BETWEEN VIMS PIPE AND
PIPE SLEEVE (TYP)
4-INCH SCH 40 PVC PIPE 5" (MIN) PIPE SLEEVE PER THE
REQUIREMENTS OF THE
STRUCTURAL ENGINEER
V202
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
CO
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Job Number:
Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
C:
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1
1
0
.
0
2
-
V
2
0
2
MB/MR
SB
MJ
TC
75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-V202.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
VAPOR INTRUSION MITIGATION
DETAILS II
NOTES:
1.PVC PRIMER AND CEMENT SHALL NOT BE USED TO CONSTRUCT SUBSLAB VAPOR MONITORING
PROBES AND CONDUIT.
2.CUT VERTICAL WALLS OF WELL VAULT TO FIT SLAB THICKNESS. ALTERNATIVE WELL VAULT IS
ACCEPTABLE PENDING APPROVAL FROM VIMS EOR.
3.BALL VALVE LOCATED ADJACENT TO SAMPLING IMPLANT IS TEMPORARY TO SUPPORT SSP
QUALITY CONTROL TESTING.
4.A MINIMUM OF 6 INCHES CONTINUOUS SEAL TO CONCRETE REQUIRED PER VAPOR BARRIER
MEMBRANE MANUFACTURER.
5.REFER TO STRUCTURAL DRAWINGS FOR REINFORCING OF WALLS, FOUNDATION, ETC.
1/4" SS BALL VALVE (NOTE 3)
CONDUIT SEALED WITH POLYURETHANE CAULK
1" MIN SCH 40 PVC
UNIVERSAL 65-8075WX 8"X8" MONITORING WELL
VAULT TRAFFIC-RATED MANHOLE COVER (NOTE 2)
1/4" OD COMPRESSION FITTING
1/4" SS BALL VALVE
PVC CAP
2" SAND
WELL PAD FOR SUBSLAB MONITORING PROBE
2" MIN
6" STAINLESS STEEL IMPLANT
CONDUIT SEALED WITH
POLYURETHANE CAULK
EXTERIOR WALL
PIPE BOOT SEAL PER
PROJECT DOCUMENTS
(NOTE 4)
15
SCALE: NTS
DETAIL
SLAB REPAIRV202
14
SCALE: NTS
DETAIL
GEOMEMBRANE VAPOR BARRIER REPAIRV202
13
SCALE: NTS
DETAIL
SAW CUT TRENCH THROUGH
GEOMEMBRANE VAPOR BARRIER
V202
12
SCALE: NTS
DETAIL
SAW CUT THROUGH GEOMEMBRANE
VAPOR BARRIER
V202
18
SCALE: NTS
DETAIL
TYPICAL REMOTE SUBSLAB
VAPOR MONITORING PROBE
V202
1/2"
PARTIAL SAW CUT THROUGH SLAB
PIPE, CONDUIT, OR OTHER SUBSLAB
ADDITION (BY OTHERS)
STEP ONE
NOTES:
1.BREAK OUT CONCRETE AFTER SAW CUTTING SHORT OF FULL DEPTH OF SLAB.
NOTES:
1.RETAIN A MINIMUM 12" LENGTH OF EXCESS VIMS LAYERS FOR OVERLAPPED SEAMS.
2.USE CAUTION TO NOT DAMAGE EXPOSED VIMS LAYERS.
3.VIMS LAYERS INCLUDE NON-WOVEN CUSHION GEOTEXTILES AND GEOMEMBRANE VAPOR
BARRIER.
NOTES:
1.CLEAN EXPOSED GEOMEMBRANE VAPOR BARRIER OF DIRT, DEBRIS, AND MOISTURE.
2.PLACE NEW VIMS LAYERS A MINIMUM OF 12-INCHES BEYOND EDGES OF REPAIR IN ALL DIRECTIONS.
3.REFER TO THE TECHNICAL SPECIFICATIONS AND GEOMEMBRANE VAPOR BARRIER MANUFACTURER
REQUIREMENTS FOR PROPER REPAIR (E.G., OVERLAP LENGTHS, GEOMEMBRANE VAPOR BARRIER
THICKNESS, ETC.) AND QUALITY CONTROL TESTING (E.G., SMOKE AND THICKNESS TESTING).
4.VIMS LAYERS INCLUDE NON-WOVEN CUSHION GEOTEXTILES AND GEOMEMBRANE VAPOR BARRIER.
SAW CUT THROUGH SLAB AND
GEOMEMBRANE VAPOR BARRIER
CONCRETE SLAB (BY OTHERS)
NON-WOVEN CUSHION GEOTEXTILE
GEOMEMBRANE VAPOR BARRIER
NON-WOVEN CUSHION GEOTEXTILE
6" VENTING AGGREGATE
SUBGRADE (BY OTHERS)
STEP TWO
CONCRETE SLAB (BY OTHERS)
NON-WOVEN CUSHION GEOTEXTILE
GEOMEMBRANE VAPOR BARRIER
NON-WOVEN CUSHION GEOTEXTILE
6" VENTING AGGREGATE
SUBGRADE (BY OTHERS)
12"
MIN.
12"
MIN.
WIDTH OF TRENCH VARIES
PIPE, CONDUIT, OR OTHER SUBSLAB
ADDITION (BY OTHERS)
STEP THREE
NEW/REPAIRED GEOMEMBRANE VAPOR
BARRIER (MIN. 12" SEAMED OVERLAP)
NEW/REPAIRED LOWER
NON-WOVEN CUSHION GEOTEXTILE PIPE, CONDUIT, OR OTHER SUBSLAB
ADDITION (BY OTHERS)
STEP FOUR
RESTORED SLAB (BY OTHERS)
NEW/REPAIRED UPPER NON-WOVEN
CUSHION GEOTEXTILE
NEW/REPAIRED GEOMEMBRANE VAPOR
BARRIER (MIN. 12" SEAMED OVERLAP)
NEW/REPAIRED LOWER
NON-WOVEN CUSHION GEOTEXTILE
NEW/REPAIRED UPPER NON-WOVEN
CUSHION GEOTEXTILE
12"
MIN.
SLAB REPAIR DETAIL 1 SLAB REPAIR DETAIL 2 SLAB REPAIR DETAIL 3 SLAB REPAIR DETAIL 4
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2
TRENCH DAM
TRENCH BACKFILL TRENCH
BACKFILL
SLURRY
SLURRY
UTILITY CONDUIT
PIPE BEDDING
PIPE BEDDING
6" MIN
NOTES:
1.TRENCH DAM SHALL CONSIST OF A MIXTURE OF 4% TYPE II CEMENT AND 2%
POWDERED BENTONITE.
2.TRENCH DAM SHALL BE AT LEAST AS WIDE AS THE UTILITY TRENCH.
3.TRENCH DAM SHALL EXTEND AT LEAST 12" OVER THE TOP OF THE UTILITY IF
BELOW THE FOUNDATION WALL.
BUILDING STRUCTURE
BUILDING EXTERIOR
17
SCALE: NTS
DETAIL
EXTERIOR TRENCH DAM DETAILV202
CONSTRUCTION JOINT
SEAL ALL CONSTRUCTION AND
OTHER SLAB JOINTS WITH
POLYURETHANE CAULK (TYP)
19
SCALE: NTS
DETAIL
TYPICAL SLAB-ON-GRADE JOINTV202
1
V201
16
SCALE: NTS
DETAIL
SECTION THROUGH CMU WALL FOOTING
WITH VIMS TRANSFER PIPING
V202
2
V201
11
V201
1/2" BIRD SCREEN ON EXHAUST
MINIMUM 10' HORIZONTAL TO ANY
BUILDING OPENING. MINIMUM 18"
ABOVE THE BUILDING ROOF AND
IMMEDIATELY ADJACENT ROOF
HANG OR OTHERWISE SUPPORT VIMS
HORIZONTAL PIPING ROOF JOIST AS
APPROVED BY STRUCTURAL ENGINEER (TYP)
CONCRETE SLAB (BY OTHERS)
4" SCH 40 PVC EXTRACTION RISER
32
V302
20
V203
21
V203
MONITORING PANEL
18
V202
CONTINGENT ACTIVE METHANE
MITIGATION FAN AND/OR ACTIVE
VIMS FAN (NOTE 5)
5
V201
PAINT ALL EXTERIOR PIPE TO
REDUCE UV DEGRADATION
V203
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
CO
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Job Number:
Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
C:
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1
1
0
.
0
2
-
V
2
0
3
MB/MR
SB
MJ
TC
75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-V203.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
VAPOR INTRUSION MITIGATION
DETAILS III
22
(CONTINGENT ON POST-OCCUPANCY MONITORING RESULTS)
SCALE: NTS
DETAIL
PASSIVE EXTRACTION RISERV203
21
(CONTINGENT ON POST-POUR AND/OR POST-OCCUPANCY METHANE SCREENING RESULTS)
SCALE: NTS
DETAIL
CONTINGENT ACTIVE METHANE MITIGATION FANV203
FRONT ELEVATION
PROVIDE 110V AND 20 AMP
POWER WITHIN 5' OF RISER FOR
CONTINGENT ACTIVE OPERATION
WEATHERTIGHT HOUSING
WITH SHUT OFF SWITCH
4" SCH 40 PVC EXTRACTION PIPE
SUPPORT STRAPPING (NOTE 2)
ELECTRICAL CONDUIT
4" WIND TURBINE VENTILATOR
MINIMUM 10' HORIZONTALLY TO ANY HVAC ROOF-TOP-UNIT
(RTU) OR OPENING INTO BUILDING.
(ALL DIRECTIONS; SEE NOTE 1)
INCLUDE LOW VOLTAGE WIRE
FOR CONTINGENT ACTIVE
MITIGATION TELEMETRY SYSTEM
1/2" NPT THREADED PLUG
TOP OF ROOF
NOTES:
1.REFER TO TECHNICAL SPECIFICATIONS FOR ADDITIONAL EXTRACTION PIPE DISCHARGE LOCATION
ALLOWANCES AND REQUIREMENTS.
2.THE CONTRACTOR IS RESPONSIBLE FOR INSTALLING APPROPRIATE BRACKETS AND ANCHORS FOR EACH
INDIVIDUAL BUILDING SURFACE MATERIAL ENCOUNTERED. THE BRACKETS SHALL BE INSTALLED IN A
MANNER THAT PROVIDES THE NECESSARY SUPPORT FOR THE PIPE AND EQUIPMENT. THE INSTALLATIONS
WILL MEET ALL BUILDING CODES, SEISMIC REQUIREMENTS, MAINTAIN A WATER TIGHT SURFACE AND WILL
NOT CREATE A MEANS TO ALLOW FUTURE DAMAGE OR FAILURE TO THE EXISTING STRUCTURES OR
SURFACES. ADJUST PIPE ROUTING AS NECESSARY TO PROVIDE THE BEST LOCATION FOR SUPPORT
BRACKETS.
3.PASSIVE EXTRACTION RISER OPERATION CONTINGENT ON POST-OCCUPANCY MONITORING RESULTS.
40" MIN
FRONT ELEVATION
MITIGATION FAN (APPROX.
4' TO 5' ABOVE GRADE)
FAN POWER DISCONNECT SWITCH
WITH DIMMING CAPABILITIES
WEATHERTIGHT HOUSING
STEEL
CLAMPS
MONITORING PANEL AND DIFFERENTIAL
PRESSURE SENSOR (NOTE 2)
1/4" VACUUM MONITORING TUBING
1/2" NPT THREADED PLUG
ELECTRICAL CONDUIT
UNISTRUT (OR EQUAL) ANCHORED INTO CONCRETE
FOUNDATION (AS NEEDED) (NOTE 3)
STEEL
CLAMPS
ANCHOR SUPPORTS TO FOUNDATION
PER MANUFACTURER REQUIREMENTS
METHANE SENSOR AT EXTACTION RISER
4" SCH 40 PVC EXTRACTION PIPE
TO ROOF
40" MIN
23
SCALE: NTS
DETAIL
EXTRACTION PIPING TO ROOFV203
NOTES:
1.ELECTRICAL CONDUIT WILL NEED TO BE INSTALLED FOR THE FAN,
MONITORING PANEL, AND SENSORS.
2.EXTERIOR PIPING SHALL BE MINIMIZED.
3.ROUTE PIPE TO MINIMIZE LENGTH OF PIPE AND NUMBER OF FITTINGS.
4.DETAIL IS TYPICAL FOR EXTRACTION RISER PIPE DESIGN TO ROOF.
1/4" VACUUM MONITORING TUBE
SUPPORT STRAPPING (TYP.)
1/2" NPT THREADED PLUG
FAN COVER
(OPTIONAL)
MITIGATION FAN (APPROX. 4' - 5' ABOVE GRADE)
RUBBER BOOT WITH
STAINLESS STEEL CLAMPS
4" SCH 40 PVC EXTRACTION PIPE
FAN POWER DISCONNECT SWITCH
WITH DIMMING CAPABILITIES
MONITORING PANEL AND DIFFERENTIAL
PRESSURE SENSOR (NOTE 1)
TO ROOF
12" MIN
40" MIN
WEATHERTIGHT HOUSING
ELECTRICAL CONDUIT
C:
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0
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0
2
-
V
2
0
3
NOTES:
1.DIFFERENTIAL PRESSURE SENSOR SHALL HAVE THE CAPABILITIES TO DIRECTLY DISPLAY DIFFERENTIAL
PRESSURE MEASUREMENTS AND PROVIDE REMOTE ALARMS IF VACUUM IS LOST.
2.THE CONTRACTOR IS RESPONSIBLE FOR INSTALLING APPROPRIATE BRACKETS AND ANCHORS FOR
EACH INDIVIDUAL BUILDING SURFACE MATERIAL ENCOUNTERED. THE BRACKETS SHALL BE INSTALLED
IN A MANNER THAT PROVIDES THE NECESSARY SUPPORT FOR THE PIPE AND EQUIPMENT. THE
INSTALLATIONS WILL MEET ALL BUILDING CODES, SEISMIC REQUIREMENTS, MAINTAIN A WATER TIGHT
SURFACE AND WILL NOT CREATE A MEANS TO ALLOW FUTURE DAMAGE OR FAILURE TO THE EXISTING
STRUCTURES OR SURFACES. ADJUST PIPE ROUTING AS NECESSARY TO PROVIDE THE BEST LOCATION
FOR SUPPORT BRACKETS.
3.FAN SELECTION BETWEEN THE ACTIVE VIMS AND ACTIVE METHANE FAN WILL BE DETERMINED BASED
OFF THE POST-POUR AND/OR POST-OCCUPANCY METHANE SCREENING RESULTS.
4.REFER TO TECHNICAL SPECIFICATIONS FOR ADDITIONAL VENT DISCHARGE LOCATION ALLOWANCES
AND REQUIREMENTS.
5.FAN TO BE SPECIFIED BY VIMS EOR.
NOTES:
1.REFER TO TECHNICAL SPECIFICATIONS FOR ADDITIONAL VENT DISCHARGE LOCATION ALLOWANCES
AND REQUIREMENTS.
2.DIFFERENTIAL PRESSURE SENSOR SHALL HAVE THE CAPABILITIES TO DIRECTLY DISPLAY DIFFERENTIAL
PRESSURE MEASUREMENTS AND PROVIDE REMOTE ALARMS IF VACUUM IS LOST.
3.THE CONTRACTOR IS RESPONSIBLE FOR INSTALLING APPROPRIATE BRACKETS AND ANCHORS FOR
EACH INDIVIDUAL BUILDING SURFACE MATERIAL ENCOUNTERED. THE BRACKETS SHALL BE INSTALLED
IN A MANNER THAT PROVIDES THE NECESSARY SUPPORT FOR THE PIPE AND EQUIPMENT. THE
INSTALLATIONS WILL MEET ALL BUILDING CODES, SEISMIC REQUIREMENTS, MAINTAIN A WATER TIGHT
SURFACE AND WILL NOT CREATE A MEANS TO ALLOW FUTURE DAMAGE OR FAILURE TO THE EXISTING
STRUCTURES OR SURFACES. ADJUST PIPE ROUTING AS NECESSARY TO PROVIDE THE BEST LOCATION
FOR SUPPORT BRACKETS.
4.FAN SELECTION BETWEEN THE ACTIVE VIMS AND ACTIVE METHANE FAN WILL BE DETERMINED BASED
OFF THE POST-POUR AND/OR POST-OCCUPANCY METHANE SCREENING RESULTS.
5.FAN TO BE SPECIFIED BY VIMS EOR.
32
V302
23
V203
20
(CONTINGENT ON BASELINE MONITORING RESULTS)
SCALE: NTS
DETAIL
ACTIVE VIMS FANV203
23
V203
32
V302
31
V302
5
V201
5
V201
5
V201
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METHANE ALARM
EVACUATE BUILDING
CALL 911
7' MIN
NOTES:
1. IF INSTALLED, ALL METHANE AUDIO/VISUAL ALARMS SHALL BE
INSTALLED ABOVE THE FLOOR AT A STANDARD HEIGHT OF 7 FEET
WITH ADJACENT SIGNAGE (AS SHOWN) UNLESS OTHERWISE NOTED.
WALL
FINISHED FLOOR
ELECTRICAL BOX
CONDUIT
CEILING
METHANE SENSORNOTES:
1.INDOOR AIR METHANE SENSORS WILL ONLY BE INSTALLED IF METHANE MITIGATION IS REQUIRED,
WHICH IS BASED UPON POST-POUR AND/OR POST-OCCUPANCY METHANE SCREENING RESULTS.
2.METHANE SENSOR SHALL BE ACCESSIBLE FOR ROUTINE MAINTENANCE AND MONITORING.
3.METHANE SENSOR SHALL HAVE A PLACARD AND IDENTIFICATION NUMBER FOR RECORD KEEPING.
4.STANDBY POWER SHALL PROVIDE SUFFICIENT POWER TO CONTINUOUSLY OPERAATE THE
INDOOR AIR METHANE SENSOR FOR 24 HOURS.
WIRE TO CONTROL PANELTUBING TO
MONITORING PANEL
M
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STROBE
WALL
SIDE VIEW - HORN AND
STROBE DEVICE
SURFACE MOUNT
HORN/STROBE
CAUTION
METHANE GAS IN PIPE
IF DAMAGED NOTIFY
BUILDING MANAGER
NO SMOKING
NO SPARKS OR FLAMES
WITHIN 25 FEET
NOTES:
1.VERTICAL METHANE EXTRACTION PIPE
LABELS WILL ONLY BE INSTALLED IF
METHANE MITIGATION IS REQUIRED, WHICH
IS BASED UPON POST-POUR AND/OR
POST-OCCUPANCY METHANE SCREENING
RESULTS.
2.ALL LABELS PLASTIC WITH ADHESIVE
BACKING, LARGE LETTERS MIN. 1" HIGH
WHITE LETTERS ON RED BACKGROUND
3.THIS LABEL SHALL BE POSTED ON EACH
EXTRACTION RISER NEAR THE TOP, ABOVE
THE ROOF LINE, AND ALSO AT THE BASE OF
PIPE. A MINIMUM OF ONE STICKER PER
EACH 10 LINEAR FEET OF PIPE.
WARNING
THIS BUILDING IS PROTECTED WITH A
METHANE MITIGATION SYSTEM. ANY
PROPOSED ALTERATION OF THE
FLOOR SLAB WITHIN THE ENCLOSED
SPACES REQUIRES NOTIFICATION
AND INSPECTION BY AN ENGINEER.
NOTES:
1.METHANE GAS MITIGATION SYSTEM
NOTIFICATION PLACARDS WILL ONLY BE
INSTALLED IF METHANE MITIGATION IS
REQUIRED, WHICH IS BASED UPON
POST-POUR AND/OR POST-OCCUPANCY
METHANE SCREENING RESULTS.
2.THIS NOTIFICATION IS TO BE
PERMANENTLY STAMPED OR ETCHED
AT A VISIBLE LOCATION NEXT TO EACH
INDOOR AIR METHANE ALARM.
3.ALL LETTERS 1/2" (MIN.) IN HEIGHT.
4.AT LEAST ONE REQUIRED PER BUILDING.
Sierra Monitor CorporationSMC Sierra Monitor Corporation5000MODELSMC5000MODEL Sierra Monitor CorporationSierra Monitor CorporationSMCMODEL5000 SMC 5000MODEL
OR CHANGE
COMB. %LEL
5ALARMS
SENTRY
SENSOR
FLASH=HIGH
RESET
TEST
1
TIME
MODE
32 4
POWER SENSOR
FLASH=HIGH
SENSOR8
ENTER
SOLID=LOW
6 7 21 ALARMS
ENTER
43 5
SOLID=LOW
76 8
COMB. %LEL
SENTRY
TROUBLE
OR CHANGECALIBRATE
LEVEL POWER LEVELSENSOR
TROUBLE
CALIBRATE
COMB. %LEL
SENSOR
SENTRY
SENSOR
SOLID=LOW
6ALARMS
SENTRY
ENTER
SENSOR
FLASH=HIGH
312 4 5
COMB. %LEL
7 8
FLASH=HIGH
21 3
LEVELSENSORPOWER
TROUBLE
OR CHANGECALIBRATE
POWER
ALARMS
SOLID=LOW
ENTER
54 6 87
LEVEL
TROUBLE
OR CHANGECALIBRATE
RESET
TEST
TIME
MODE
RESET
TEST
TIME
MODE
RESET
TEST
TIME
MODE
NOTES:
1.METHANE DETECTION SYSTEM WILL ONLY BE INSTALLED IF METHANE MITIGATION IS REQUIRED, WHICH
IS BASED UPON POST-POUR AND/OR POST-OCCUPANCY METHANE SCREENING RESULTS.
2.THE METHANE GAS DETECTION SYSTEM SHALL OPERATE 24 HR./DAY CONTINUOUSLY.
3.ALL BUILDING STROBE/ALARMS TO SOUND SIMULTANEOUSLY UPON ANY HIGH GAS DETECTION IN
BUILDING.
4.STANDBY POWER SHALL PROVIDE SUFFICIENT POWER TO THE METHANE GAS SENSORS FOR 24 HOURS.
5.FIRE DEPARTMENT NOTIFICATION UNIT SHALL BE ABLE TO PROVIDE EXTERNAL NOTIFICATION TO THE
FIRE DEPARTMENT IF INDOOR AIR SENSOR EXCEEDS 25% LEL.
6.INTERNAL NOTIFICATION TELEMETRY UNIT SHALL SEND A NOTIFICATION IF THE INDOOR AIR SENSOR
EXCEEDS 10%, OR IF THE EXTRACTION VENT RISER EXCEEDS 10% OR 25% LEL.
FIRE DEPARTMENT
NOTIFICATION UNIT
INTERNAL
NOTIFICATIION
TELMETRY UNIT
CONTROL PANELSTANDBY POWER
SOURCE
CONTINGENT METHANE GAS SENSOR
(EXTRACTION RISER SENSOR)
CONTINGENT METHANE
ALARM DEVICE
CONTINGENT METHANE GAS
SENSOR (INDOOR AIR SENSOR)
120 VOLT ELECTRIC POWER
TELEMETRIC MONITORING SYSTEM
IN WEATHERPROOF ENCLOSURE
COMMUNICATION WIRING (IF NEEDED-
SEE NOTE 1)
LOW VOLTAGE WIRING TO DIFFERENTIAL
PRESSURE SENSOR
NOTES:
1.IF TELEMETRY SYSTEM REQUIRES A PHONE LINE OR ETHERNET LINE,
INSTALL APPROPRIATE WIRING.
2.IF DESIRED, THE TELEMETRY SYSTEM FOR STATIC VACUUM
MONITORING MAY BE INTEGRATED INTO THE METHANE DETECTION
SYSTEM, SO THAT ONE TELEMETRY SYSTEM PROVIDES REQUIRED
STATIC VACUUM AND THE METHANE TELEMETRIC NOTIFICATIONS.
3.TELEMETRY SYSTEM SHALL HAVE A LOCAL ALARM CAPABILITY THAT
CAN ACTIVATE AN AUDIBLE/VISUAL ALARM WHEN A MINIMUM
VACUUM THRESHOLD IS EXCEEDED. THIS ALARM CAN BE BUILT INTO
THE TELEMETRY SYSTEM OR BE A STAND-ALONE DEVICE INSTALLED
NEAR THE TELEMETRY SYSTEM.
V301
VAPOR INTRUSION MITIGATION
DETAILS IV
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
CO
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Job Number:
Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
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75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-V301.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
27
V301
DETAIL
CONTINGENT METHANE ALARM DEVICE -
HORN AND STROBE COMBINATION
SCALE: NOT TO SCALE
25
V301
DETAIL
CONTINGENT METHANE ALARM DEVICE MOUNT
SCALE: NOT TO SCALE
28
V301
DETAIL
CONTINGENT CEILING MOUNTED INDOOR
AIR METHANE DETECTOR (TYP)
SCALE: NOT TO SCALE
30
V301
DETAIL
CONTINGENT METHANE GAS MITIGATION
SYSTEM NOTIFICATION PLACARD
SCALE: NOT TO SCALE
29
V301
DETAIL
CONTINGENT VERTICAL METHANE
EXTRACTION PIPE LABEL (TYP)
SCALE: NOT TO SCALE
24
V301
DETAIL
CONTINGENT METHANE DETECTION
SYSTEM (CONTROL PANEL)
SCALE: NOT TO SCALE
26
V301
DETAIL
TELEMETRY SYSTEM FOR STATIC
VACUUM MONITORING
SCALE: NOT TO SCALE
31
302
27
301
24
301
32
302
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301
(CONTINGENT ON POST-POUR AND/OR
POST-OCCUPANCY METHANE SCREENING RESULTS)
(CONTINGENT ON POST-POUR AND/OR
POST-OCCUPANCY METHANE SCREENING RESULTS)
(CONTINGENT ON POST-POUR AND/OR POST
OCCUPANCY METHANE SCREENING RESULTS)
(CONTINGENT ON POST-POUR AND/OR
POST-OCCUPANCY METHANE SCREENING RESULTS)
(CONTINGENT ON POST-POUR AND/OR
POST-OCCUPANCY METHANE SCREENING RESULTS)
(CONTINGENT ON POST-POUR AND/OR
POST-OCCUPANCY METHANE SCREENING RESULTS)
NOTES:
1.AIR INLET SHALL BE SECURED TO EXTERIOR WALL IN
ACCORDANCE WITH LOCAL BUILDING CODE.
EXTERIOR WALL
TEE RAIN CAP WITH
0.5" SCREEN OPENINGS
MIN 36" /
MAX 60"
(ABOVE
GRADE)
4" Ø SCH 40 PVC PIPE
ANCHOR TO THE WALL
1/4" NYLAFLOW TUBING
1/4" SS BALL VALVE
CONTINGENT CEILING MOUNTED
INDOOR AIR METHANE SENSOR
(NOTE 2)
INTERIOR EXTERIOR
1' MIN
MESH END AROUND CONDUIT TO
PROTECT REFERENCE TUBING
CONTINGENT CALIBRATION
TUBING (NOTE 2)
INDOOR AIR REFERENCE TUBING
DIFFERENTIAL PRESSURE
SENSOR (NOTE 3)
WEATHERTIGHT MONITORING PANEL
(ADD ELECTRICAL POWER AS NEEDED)
1/4" COMPRESSION FITTING
1/4" VACUUM MONITORING TUBE
NOTES:
1.ALL RENTAL UNITS WILL HAVE A MONITORING PANEL WITH INDOOR AIR REFERENCE
TUBING AND A DIFFERENTIAL PRESSURE SENSOR. THE COMMUNITY BUILDING WILL
HAVE A MONITORING PANEL WITH A DIFFERENTIAL PRESSURE SENSOR, BUT NO
INDOOR AIR REFERENCE TUBING.
2.METHANE SENSORS AND CALIBRATION CONDUIT AND TUBING WILL ONLY BE
INSTALLED IF METHANE MITIGATION IS REQUIRED, WHICH IS CONTINGENT UPON
POST-POUR AND/OR POST-OCCUPANCY METHANE SCREENING RESULTS.
3.DIFFERENTIAL PRESSURE SENSOR SHALL HAVE THE CAPABILITIES TO DIRECTLY
DISPLAY DIFFERENTIAL PRESSURE MEASUREMENTS AND PROVIDE REMOTE ALARMS
IF FAN VACUUM IS LOST. (ELECTRICAL POWER TO BE SUPPLIED AS NEEDED)
1" SCH 40 PVC
SEAL PENETRATION, INCLUDING ANNULAR
SPACE IN PIPE WITH POLYURETHANE CAULK
CONTINGENT METHANE SENSOR
CALIBRATION PORT (NOTE 2)
DIFFERENTIAL PRESSURE SENSOR (NOTE 3)
INDOOR AIR REFERENCE
MONITORING PORT
BUILDING WALL
CAVITY
TO MITIGATION FAN
1/4" NYLAFLOW TUBING
STAND-ALONE METHANE SENSOR
(IF REQUIRED BASED ON TESTING [NOTE 3])
ID
#
TO

R
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F
FR
O
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B
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GR
A
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(
N
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2
)
4-INCH WYE, WITH THREADED
BUSHING TO ACCOMMODATE
GAS SENSOR ASSEMBLY
PIPE ID LABEL
6" MIN
1/2" NPT THREADED PLUG
NOTES:
1.STANDBY POWER SHALL PROVIDE SUFFICIENT POWER TO CONTINUOUSLY
OPERATE THE EXTRACTION RISER METHANE SENSOR FOR 24 HOURS.
2.METHANE SENSOR SHOULD BE 6" AT A MINIMUM FROM TOP OF SLAB.
3.EXTRACTION RISER METHANE SENSORS WILL ONLY BE INSTALLED IF
METHANE MITIGATION IS REQUIRED, WHICH IS CONTINGENT UPON
POST-POUR AND/OR POST OCCUPANCY METHANE SCREENING RESULTS.
LOW VOLTAGE WIRE TO
CONTINGENT METHANE
DETECTION SYSTEM CONTROL
PANEL (NOTE 1)
V302
VAPOR INTRUSION
MITIGATION DETAILS V
161 SOUTH LEXINGTON AVENUE
ASHEVILLE, NORTH CAROLINA 28801 USA
CO
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Job Number:
Date:
Revisions:
Sheet
DES BY:
CHK BY:
DRN BY:
DRAWING INFORMATION
APP BY:
SAWMILL
VILLAGE
GN9110.02
06/06/2024
C:
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0
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0
2
-
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2
MB/MR
SB
MJ
TC
75% DRAFT DESIGN DRAWINGS07/20/2023
PW: N\NORTHWESTERN HOUSING ENTERPRISES\GN9110 - SAWMILL VILLAGE BF REDEVELOPMENT\CADD\01 - VIMS DESIGN\DRAWINGS\SHEETS\ GN9110.02-V302.DWG
90% DRAFT DESIGN DRAWINGS10/23/2023
100% REV 1 DESIGN DRAWINGS06/06/2024
1
33
SCALE: NTS
DETAIL
TYPICAL AIR INLET TERMINATIONV302
32
SCALE: NTS
DETAIL
MONITORING PANELV302
31
SCALE: NTS
DETAIL
METHANE SENSOR AT EXTRACTION RISERV302
23
V203
28
V301
(CONTINGENT ON METHANE ASSESSMENT RESULTS)
24
V301
(CONTINGENT ON METHANE ASSESSMENT RESULTS)
NOTES:
1.DETAIL FROM VAPOR PIN STANDARD
OPERATING PROCEDURE INSTALLATION OF THE
VAPOR PIN INSERT, JUNE 2020
34
SCALE: NTS
DETAIL
TYPICAL SUBSLAB VAPOR MONITORING PROBEV302

APPENDIX B

Technical Specifications
Prepared for
Northwestern Housing Enterprises, Incorporated
P.O. Box 1673
Boone, North Carolina 28607

APPENDIX B: TECHNICAL SPECIFICATIONS
FOR THE CONSTRUCTION OF THE VIMS AT
THE SAWMILL HOLLOW PROPERTY
Yancey County Parcel No. 083003244675000

Intersection of Sawmill Hollow Road and US Highway
19E
Burnsville, North Carolina
Brownfields Project No. 26015-22-100
Prepared by
Geosyntec Consultants of NC, P.C.
161 South Lexington Avenue
Asheville, North Carolina 28801

Project Number GN9110

June 2024

Revision 1

SAWMILL HOLLOW BROWNFIELDS PROPERTY
CONSTRUCTION DOCUMENTS June 2024

TABLE OF CONTENTS
Section 13 3390 Geotextile
Section 13 3391 Venting Aggregate
Section 13 3392 VIMS Piping
Section 13 3393 Geomembrane Vapor Barrier
Section 13 3394 Wind Driven Turbine, VIMS Fans, Differential Pressure Sensor, and Telemetry
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
GEOTEXTILE 13 3390 - 1

SECTION 13 3390
GEOTEXTILE
PART 1 — GENERAL
The Vapor Intrusion Mitigation System (VIMS) Geotextile Technical Specifications presented herein shall
be used in the construction of the VIMS for the Sawmill Hollow Brownfields property as shown on the
Construction Drawings.
1.1 DESCRIPTION OF WORK
A. The Geosynthetic Installer shall attend the pre-construction meeting at the site and prior to the
commencement of construction activities. This meeting will be held in accordance with the
requirements stipulated in the Construction Quality Assurance (CQA) Plan.
B. The Geosynthetic Installer shall furnish all labor, materials, tools, supervision, transportation,
equipment, and incidentals necessary for the installation of the geotextile. The work shall be carried
out as specified herein and in accordance with the Construction Documents.
C. The work shall include, but not be limited to, delivery, storage, placement, and seaming of the
various geotextile components of the project.
D. One non-woven needle-punched geotextile (referred to herein as “Filter Geotextile”) shall be
deployed under perforated VIMS extraction piping between the subgrade and the Venting
Aggregate in a minimum of 2 foot perimeter below the VIMS piping drain holes as indicated on
the Construction Drawings. One non-woven needle-punched geotextile (referred to herein as the
“Upper Cushion Geotextile”) shall be deployed between the geomembrane vapor barrier and the
overlying concrete slab. A second non-woven needle-punched geotextile (referred to herein as
the “Lower Cushion Geotextile”) shall be deployed between the Venting Aggregate and the
geomembrane vapor barrier (defined in Section 13 3393). If the geomembrane vapor barrier is a
composite membrane consisting of a bonded geotextile at the base of the geomembrane, then
the “Lower Cushion Geotextile” is not required. If the selected geomembrane vapor barrier does
not contain a bonded geotextile at the base of the geomembrane, then the minimum specifications
for the Lower Cushion Geotextile defined herein applies. Upper Cushion Geotextile minimum
specifications are provided in Table 3390-1. Filter Geotextile and Lower Cushion Geotextile
minimum specifications are provided in Table 3390-2.
1.2 RELATED SECTIONS
A. Section 13 3391 — Venting Aggregate
B. Section 13 3392 — VIMS Piping
C. Section 13 3393 — Geomembrane Vapor Barrier
D. Section 13 3394 — Wind-Driven Turbines, VIMS Fans, Differential Pressure Sensor, and
Telemetry
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
GEOTEXTILE 13 3390 - 2

1.3 REFERENCES
A. General:
1. The following documents form part of the Specifications to the extent stated. Where differences exist between codes and standards, the Contractor shall request clarification from the Engineer as to which applies. 2. Unless otherwise noted, the referenced standard edition is the current one at the time of commencement of the Work.
B. Construction Documents: Vapor Intrusion Mitigation System Design: Sawmill Hollow Property
(Geosyntec Consultants of NC, PC [Geosyntec], 2024).
C. Construction Quality Assurance Plan (CQA Plan), Geosyntec (submitted as part of the Vapor
Intrusion Mitigation System Design: Sawmill Hollow Property Report, 2024).
D. Latest version of ASTM International (ASTM) standards:
1. ASTM D4355 Standard Test Method for Deterioration of Geotextile from Exposure to
Light, Moisture and Heat in a Xenon Arc Type Apparatus
2. ASTM D4533 Standard Test Method for Trapezoid Tearing Strength of Geotextiles
3. ASTM D4632 Standard Test Method for Breaking Load and Elongation of Geotextile
(Grab Method)
4. ASTM D5261 Standard Test Method for Measuring Mass per Unit Area of Geotextiles
5. ASTM D6241 Standard Test Method for Static Puncture Strength of Geotextile and
Geotextile-Related Products Using a 50-mm Probe.
1.4 SUBMITTALS
A. The Geosynthetic Installer shall submit to the Engineer, at least 7 days prior to geotextile delivery,
the following information regarding the proposed geotextile:
1. manufacturer and product name; and
2. minimum property values of the proposed geotextile and the corresponding test
procedures.
B. The Geosynthetic Installer (or Geosynthetic Installer’s direct representative) shall sign a
certification of acceptance form prior to and following the installation of the geotextile.
1.5 QUALITY ASSURANCE
A. The Geosynthetic Installer shall ensure that the geotextile and installation methods used meet the
requirements of the Construction Documents and this Section. Any material or method that does
not conform to these documents, or to alternatives approved in writing by the Engineer, will be
rejected and shall be repaired or replaced by the Geosynthetic Installer.
B. The Geosynthetic Installer shall be aware of all monitoring and conformance testing required by the
CQA Plan. The CQA Consultant will perform this monitoring. If nonconformances or other
deficiencies are found in the Geosynthetic Installer’s materials or completed work, the Geosynthetic
Installer will be required to repair the deficiency or replace the deficient materials.
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
GEOTEXTILE 13 3390 - 3

1.6 MANUFACTURING QUALITY CONTROL
A. The geotextile shall be manufactured with quality control procedures that meet or exceed generally
accepted industry standards.
B. The Geotextile Manufacturer shall sample and test the geotextile to demonstrate that the material
conforms to the requirements of these Specifications.
C. At a minimum, the following manufacturing quality control tests shall be performed on the cushion
geotextiles, and Filter Geotextile:
Upper Cushion Geotextile
95

D. The Geotextile Manufacturer shall comply with the certification and submittal requirements of this
Section.

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
GEOTEXTILE 13 3390 - 4

PART 2 — PRODUCTS
2.1 GEOTEXTILE PROPERTIES
A. The cushion and filter geotextiles shall be nonwoven materials, suitable for use in cushion and
filtration applications, respectively, having properties that comply with the required property values
shown in Tables 3390-1 and 3390-2.
2.2 PACKAGING AND LABELING
A. Geotextile shall be supplied in rolls wrapped in relatively impermeable and opaque protective
covers.
B. Geotextile rolls shall be marked or tagged with the following information:
1. manufacturer's name;
2. product identification;
3. lot or batch number;
4. roll number; and
5. roll dimensions.
2.3 TRANSPORTATION, HANDLING, AND STORAGE
A. Handling, unloading, storage, and care of the geotextile prior to and following installation at the site,
is the responsibility of the Geosynthetic Installer. The Geosynthetic Installer shall be liable for any
damage to the materials incurred prior to final acceptance by the Engineer.
B. The geotextile shall be protected from sunlight, excessive heat or cold, puncture, or other damaging
or deleterious conditions. The geotextile shall be protected from mud, dirt, solvents, fuels, and dust.
Any additional storage procedures required by the Geotextile Manufacturer shall be the
responsibility of the Geosynthetic Installer.

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
GEOTEXTILE 13 3390 - 5

PART 3 — EXECUTION
3.1 FAMILIARIZATION
A. Prior to implementing any of the work described in this Section, the Geosynthetic Installer shall
become thoroughly familiar with the site, the site conditions, and all portions of the work falling within
this Section.
B. Inspection:
1. The Geosynthetic Installer shall carefully inspect the installed work of all other Sections
and verify that all such work is complete to the point where the installation of this
Section may properly commence without adverse effect.
2. If the Geosynthetic Installer has any concerns regarding the installed work of other
Sections or the site, the Engineer shall be notified, in writing, prior to commencing the work.
Failure to notify the Engineer or installation of the geotextile will be construed as
Geosynthetic Installer’s acceptance of the related work of all other Sections.
3. The Geosynthetic Installer (or Geosynthetic Installer direct representative) shall sign a
certification of acceptance form following the inspection of the various system components.
This includes an inspection prior to the placement of geotextile and following the installation
of VIMS components.
3.2 PLACEMENT
A. The Geosynthetic Installer shall handle all geotextiles in such a manner as to ensure they are not
damaged in any way.
B. After unwrapping the geotextile from its opaque cover, the geotextile shall not be left exposed for a
period in excess of 14 days unless a longer exposure period is approved in writing by the Geotextile
Manufacturer and approved by the Engineer.
C. The Geosynthetic Installer shall anchor or weight all geotextile with sandbags, or the equivalent, to
prevent wind uplift. No soil, gravel bags, stakes, and/or nails shall be used to anchor geotextile.
D. The Geosynthetic Installer shall take care not to entrap stones, excessive dust, or moisture between
the geotextile and geomembrane vapor barrier.
E. The Geosynthetic Installer shall examine the entire geotextile surface after installation to ensure
that no foreign objects are present that may damage the geotextile or adjacent layers. The
Geosynthetic Installer shall remove any such foreign objects and shall replace any damaged
geotextile.
3.3 SEAMS AND OVERLAPS
A. Geotextiles shall be overlapped a minimum of 12 inches.
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GEOTEXTILE 13 3390 - 6

3.4 REPAIR
A. Any holes or tears in the geotextile shall be repaired using a patch made from the same geotextile.
Geotextile patches shall be overlapped a minimum of 12 inches and may be taped to the underlying
geotextile base. Should any tear exceed 50% of the width of the roll, that roll shall be removed and
replaced.
B. The Geosynthetic Installer shall take all precautions necessary to avoid contamination of the
geotextile by solvents and fuels. If solvents and/or fuels are spilled on or otherwise impact the
geotextile, the Geosynthetic Installer shall remove and replace the geotextile and any additional
impacted materials (rock, subgrade, geomembrane) to the satisfaction of the CQA Consultant.
3.5 PLACEMENT OF OVERLYING MATERIALS
A. The Geosynthetic Installer shall place overlying materials (venting aggregate, concrete
reinforcement, concrete, etc.) on top of the geotextile in such a manner as to ensure that:
1. the geotextile and the underlying materials are not damaged;
2. minimum slippage occurs between the geotextile and the underlying layers during
placement; and
3. excess stresses are not produced in the geotextile.
B. There shall not be any aggregate placed between the Upper Cushion Geotextile and the slab.
C. Construction equipment directly on the Upper Cushion Geotextile shall not exceed 85 pounds per
square inch (psi). Concrete trucks can exhibit ground pressures in excess of 120 psi; concrete trucks
are not allowed directly on any VIMS component (cushion geotextile, geomembrane, etc.).
D. No construction equipment is allowed directly on the Filter Geotextile or Lower Cushion Geotextile.
E. Sections of plywood or other approved methods shall be employed by the Geosynthetic Installer in
highly trafficked areas and where materials are to be stockpiled (e.g., under rebar bundles) to
minimize the potential for damage to the underlying geomembrane vapor barrier.
F. At no time shall stakes or other objects be driven through the geotextile.
3.6 PROTECTION OF WORK
A. The Geosynthetic Installer shall use all means necessary to protect all work of this Section.
B. In the event of damage, the Geosynthetic Installer shall make repairs and replacements to the
satisfaction of the Engineer at the expense of the Geosynthetic Installer.

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
GEOTEXTILE 13 3390 - 7

TABLE 3390-1 and TABLE 3390-2
REQUIRED PROPERTY VALUES FOR GEOTEXTILES

Properties Qualifiers Units Upper Cushion
Specified Values
Filter and Lower
Cushion1
Test Method
95
Note:
1. If the geomembrane vapor barrier is a composite membrane consisting of geotextile bonded to the base of
the geomembrane vapor barrier, then a “Lower Cushion Geotextile” is not required. If the selected
geomembrane vapor barrier does not contain a geotextile bonded to the base of the geomembrane vapor
barrier, then the minimum specifications for the Lower Cushion Geotextile shown in Table 3390-2 applies.
2. N/S – Not Specified

[END OF SECTION]
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024

VENTING AGGREGATE 13 3391 - 1

SECTION 13 3391
VENTING AGGREGATE
PART 1 — GENERAL
The Venting Aggregate Technical Specifications presented herein shall be used in the construction of the
Vapor Intrusion Mitigation System (VIMS) for the Sawmill Hollow Brownfields Property as shown on the
Construction Drawings.
1.1 DESCRIPTION OF WORK
A. The Contractor shall attend the pre-construction meeting at the site and prior to the
commencement of construction activities. The meeting will be held in accordance with the
requirements stipulated in the Construction Quality Assurance (CQA) Plan.
B. The Contractor shall furnish all labor, materials, tools, supervision, transportation, and equipment
necessary to install venting aggregate material, as shown on the Construction Drawings.
1.2 RELATED SECTIONS
A. Section 13 3390 — Geotextile
B. Section 13 3392 — VIMS Piping
C. Section 13 3393 — Geomembrane Vapor Barrier
D. Section 13 3394 — Wind-Driven Turbines, VIMS Fans, Differential Pressure Sensor, and
Telemetry
1.3 REFERENCES
A. General:
1. The following documents form part of the Specifications to the extent stated. Where differences exist between codes and standards, the Contractor shall request clarification from the Engineer as to which applies. 2. Unless otherwise noted, the referenced standard edition is the current one at the time of commencement of the Work.
B. Construction Documents: Vapor Intrusion Mitigation System Design: Sawmill Hollow Property
(Geosyntec Consultants of NC, PC [Geosyntec], 2024).
C. Construction Quality Assurance Plan (CQA Plan), Geosyntec (submitted as part of the Vapor
Intrusion Mitigation System Design: Sawmill Hollow Property, 2024).
D. Latest version of the ASTM International standards (“ASTM”) specifications:
1. ASTM C33 Standard Specification for Concrete Aggregates
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024

VENTING AGGREGATE 13 3391 - 2

1.4 SUBMITTALS
A. The Contractor shall submit to the Engineer for approval, at least 7 days prior to installation of this
material, Certificates of Compliance for the venting aggregate to be furnished. Certificates of
Compliance shall consist of a properties sheet of the venting aggregate gradation relative to the
specifications outlined herein.
B. Following installation of the venting aggregate, the geomembrane vapor barrier installer (Installer)
shall provide certification of acceptance forms to the Contractor documenting the venting aggregate
has been prepared in a condition suitable for the installation of the overlying geomembrane vapor
barrier and in accordance with the requirements of the geomembrane vapor barrier manufacturer.
The certification of venting aggregate acceptance forms shall be provided to the CQA Consultant
for inclusion in the VIMS CQA Report.
1.5 QUALITY ASSURANCE
A. The Contractor shall ensure that the materials and methods used for installing the venting aggregate
meet the requirements of the Construction Documents and this Section. Any material or method
that does not conform to these documents, or to alternatives approved in writing by the Engineer,
will be rejected and shall be repaired or replaced by the Contractor.

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024

VENTING AGGREGATE 13 3391 - 3

PART 2 — MATERIALS
2.1 VENTING AGGREGATE
A. Venting aggregate shall meet the grading requirements specified in Table 3391-1. The venting
aggregate shall be graded as #57 Stone per the American Association of State Highway and
Transportation Officials (AASHTO) requirements. Alternative gradations may be acceptable
pending review and written approval from the Engineer.
B. Venting aggregate shall be washed to minimize fines in accordance with the gradation requirements
outlined herein.
C. Venting aggregate shall be hard, durable, and not subject to deterioration.
D. Venting aggregate shall be free of organics, rubbish, debris, and other objectionable material.

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024

VENTING AGGREGATE 13 3391 - 4

PART 3 — EXECUTION
3.1 VENTING AGGREGATE PLACEMENT
A. Prior to placement of venting aggregate, Contractor shall ensure surface of prepared subgrade is
smooth and unyielding, and free from loose objects/materials.
B. Filter geotextile shall be installed between the venting aggregate and subgrade material in select
locations, as indicated on the Construction Drawings.
C. Venting aggregate shall meet the requirements of these specifications during placement (e.g., no
addition of fines due to stockpiling or field conditions).
D. Venting aggregate shall be placed to a minimum of 6-inches of venting aggregate as indicated on
the Construction Drawings.
E. Venting aggregate shall be leveled and lightly tamped or rolled to create a firm and unyielding
surface for the overlying geomembrane vapor barrier.
F. Protrusions of venting aggregate shall not be in excess of 0.75-inches.
3.2 PROTECTION OF WORK
A. The Contractor shall use all means necessary to protect all work of this Section.
B. Solvent and/or fuel spills on or within the venting aggregate shall be remediated to the satisfaction
of the Environmental Consultant. Materials (geotextile, rock, pipe, and/or subgrade) impacted by
the spills shall be removed from within the footprint of the VIMS and disposed of in accordance with
local regulations.

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024

VENTING AGGREGATE 13 3391 - 5

TABLE 3391-1
SIEVE SIZE SPECIFICATIONS FOR VENTING AGGREGATE

#57 Stone – ASTM C33 and AASHTO M 80 (Nominal Size is 1 to No. 4 inch) (25.4 to 4.75 mm)
Sieve Size (Sieves with Square Openings)

[END OF SECTION]

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
VIMS PIPING 13 3392 - 1

SECTION 13 3392
VIMS PIPING
PART 1 — GENERAL
The Vapor Intrusion Mitigation System (VIMS) Piping Technical Specifications presented herein shall be
used in the construction of the VIMS for the Sawmill Hollow Brownfields property as shown on the
Construction Drawings.
1.1 DESCRIPTION OF WORK
A. The Contractor shall attend the pre-construction meeting at the site and prior to the commencement of construction activities. This meeting will be held in accordance with the requirements stipulated in the Construction Quality Assurance (CQA) Plan.
B. The Contractor shall furnish all labor, materials, tools, supervision, transportation, and equipment necessary to install air inlet and vapor extraction vent strip, polyvinyl chloride (PVC) Schedule (Sch.) 40 pipe, and fittings, as shown on the Construction Documents.
1.2 RELATED SECTIONS
A. Section 13 3390 — Geotextile
B. Section 13 3391 — Venting Aggregate
C. Section 13 3393 — Geomembrane Vapor Barrier
D. Section 13 3394 — Wind-Driven Turbines, VIMS Fans, Differential Pressure Sensor, and
Telemetry
1.3 REFERENCES
A. General:
1. The following documents form part of the Specifications to the extent stated. Where differences exist between codes and standards, the Contractor shall request clarification from the Engineer as to which applies. 2. Unless otherwise noted, the referenced standard edition is the current one at the time of commencement of the Work.
B. Construction Documents: Vapor Intrusion Mitigation System Design: Sawmill Hollow Property
(Geosyntec Consultants of NC, PC [Geosyntec], 2024).
C. Construction Quality Assurance Plan (CQA Plan), Geosyntec (submitted as part of the Vapor
Intrusion Mitigation System Design: Sawmill Hollow Property Report, 2024).
D. Latest version of the ASTM International standards (ASTM):
1. ASTM D1784 Standard Specification for Rigid Poly (Vinyl Chloride) (PVC) Compounds
and Chlorinated Poly (Vinyl Chloride) (CPVC) Compounds.
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VIMS PIPING 13 3392 - 2

2. ASTM D1785 Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Pipe,
Schedules 40, 80 and 120.
3. ASTM D2466 Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings,
Schedule 40.
4. ASTM D2564 Standard Specification for Solvent Cements for Poly (Vinyl Chloride) (PVC)
Plastic Pipe and Fittings.
5. ASTM D2774 Standard Practice for Underground Installation of Thermoplastic Pressure
Piping.
6. ASTM D2855 Standard Practice for the Two-Step (Primer and Solvent Cement) Method
of Joining Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride)
(CPVC) Pipe and Piping Components with Tapered Sockets.
7. ASTM F656 Standard Specification for Primers for Use in Solvent Cement Joints of
Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings.
1.4 SUBMITTALS
A. The Contractor shall submit to the Engineer for approval, at least 7 days prior to installation of this
material, Certificates of Compliance for the vent strip, PVC pipe, and fittings to be furnished. Certificates of Compliance shall consist of a properties sheet, including specified properties measured using test methods indicated herein.
B. The Contractor shall submit to the Engineer, as-built plans of the installed PVC piping, vent strip, and appurtenant fittings, including both horizontal and vertical locations of installed PVC pipe/vent strip, and, as applicable, PVC piping/vent strip modifications that were made during construction as approved by the Engineer.
1.5 QUALITY ASSURANCE
A. The Contractor shall ensure that the materials and methods used for vent strip, PVC pipe, and fitting installation meet the requirements of the Construction Drawings and this Section. Any material or method that does not conform to these documents, or to alternatives approved in writing by the Engineer, will be rejected and shall be repaired or replaced by the Contractor.
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
VIMS PIPING 13 3392 - 3

PART 2 — MATERIALS
2.1 PVC PIPE & FITTINGS
A. PVC pipe and fittings shall be manufactured from a PVC compound which meets the requirements of Cell Classification 12454-B polyvinyl chloride as outlined in ASTM D1784.
B. PVC pipe shall meet the requirements of ASTM D1784 and ASTM D1785 for Schedule 40 PVC pipe.
C. PVC fittings shall meet the requirements of ASTM D2466.
D. Clean rework or recycle material generated by the manufacturer's own production may be used so long as the pipe or fittings produced meet all the requirements of this Section.
E. Pipe and fittings shall be homogenous throughout and free of visible cracks, holes, foreign inclusions, or other injurious defects. Being uniform in color, capacity, density, and other physical properties.
F. PVC pipe and fitting primer shall meet the requirements of ASTM F656 and solvent cements shall meet the requirements of ASTM D2564.
G. PVC pipe and fitting primer and cement shall meet the requirements of California SCAQMD Rule 1168/316A for Low VOC emissions.
2.2 VENT STRIP
A. Vent strip shall be comprised of a three-dimensional high-density polyethylene (HDPE) or
polystyrene (PS) core wrapped in a non-woven, needle-punched filter fabric.
B. Minimum product specifications for the vent strip are provided in Table 3392-1.
C. Manufacturer-approved fittings to connect vent strip to pipes as shown on the Construction Documents shall be provided.
2.3 LABELING
A. Vapor extraction and air inlet pipes shall be labeled “VAPOR INTRUSION MITIGATION SYSTEM: NOTIFY BUILDING MAINTENANCE IN CASE OF DAMAGE” in at least 0.5-inch lettering every 10 feet along the entire length of above grade pipe.
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
VIMS PIPING 13 3392 - 4

PART 3 — EXECUTION
3.1 VENT STRIP AND PVC PIPE HANDLING
A. When shipping, delivering, and installing vent strip, PVC pipe, fittings, and accessories, do so in a manner to achieve a sound, undamaged installation. Provide adequate storage for all materials and equipment delivered to the job site. Materials shall be handled carefully in loading and unloading so as not to damage the vent strip, PVC pipe, fittings, or underlying materials.
B. Vent strip shall not be exposed to UV-light for durations longer than 14-days unless approved in writing by the Manufacturer.
3.2 PVC PIPE BEDDING
A. Pipe bedding shall consist of venting aggregate as defined in VIMS Technical Specifications Section 13 3391.
B. Filter geotextile shall be installed fully below portions of the pipe bedding trenches as indicated on the Construction Drawings and in accordance with Section 13 3390 (Geotextile). The filter geotextile shall be installed below the drain holes of the PVC pipe.
C. The bedding shall be placed to the lines and grades shown on the Construction Drawings.
D. Trench dams shall be installed in accordance with, and as shown on, the Construction Drawings. Trench dams shall be installed for any utilities that enter the building through or under the building foundations. The intent of the trench dam is to mitigate vapors in the utility trench backfill from migrating along the trench backfill under the building.
E. Pipe bedding shall be placed in a manner which does not deform or otherwise damage the pipe and fittings.
3.3 PVC PIPE INSTALLATION
A. PVC pipe installation shall conform to these Specifications, the Manufacturer’s recommendations, and as outlined in ASTM D2774.
B. Solid wall PVC pipe and fittings shall be installed as shown on the Construction Drawings.
C. Solid wall PVC pipe shall be installed on a minimum thickness
2-inch venting aggregate and backfilled with sufficient quantity of venting aggregate to cover the PVC pipe in its entirety and as indicated on the Construction Drawings.
D. Pipe trench tolerances shall not exceed more than 4-inches beyond the trench depths and widths shown on the Construction Drawings.
E. All piping penetrations, including but not limited to the plumbing and electrical conduit, VIMS extraction, air inlet, and vapor monitoring piping, shall be sealed to the geomembrane vapor barrier
in accordance with the manufacturer requirements, Technical Specifications Section 13 3393, and Construction Drawings.
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VIMS PIPING 13 3392 - 5

F. Temporary pipe end caps shall be installed in the exposed branches (e.g., pipe fittings, air inlet
pipes) prior to the installation of subsequent section of PVC piping to prevent unintended accumulation of water and/or debris in the fitting/pipe.
G. Piping penetrations through slab infrastructure shall be completed in accordance with structural requirements. In situations with multiple pipe penetrations through the slab in confined areas, as in
the case of a utility bank, piping shall be sealed to the geomembrane vapor barrier as indicated in the Construction Drawings or in an alternative method approved by the Geomembrane Vapor Barrier manufacturer.
H. If pipe penetrations through exterior concrete are sleeved (as required by others), the annular
space between the pipe and sleeve shall be sealed. Seal annular space with waterproof modular seal by Link-Seal, Metraseal or equivalent alternative product as approved by building code,
Engineer, and other applicable design team members (e.g., structural engineer, architect).
I. Adjustments in the foundation design that may require vent strip and/or PVC pipe routing changes shall not be implemented unless approved by the Engineer.
J. PVC pipe and vent strip shall be inspected for cracks, deep scratches, or other damages prior to
installation. Any pipe showing damage, which in the opinion of the Engineer will affect performance of the pipe, must be removed from the site. Replace any material found to be defective.
K. Install drain holes at base of solid wall piping as indicated on the Construction Drawings.
L. The terminal end of the air inlet and vapor extraction PVC piping is open with a screen as indicated
on the Construction Drawings. The screen shall be stainless steel with 0.5-inch openings.
3.4 JOINING OF PVC PIPES
A. Air inlet and vapor extraction PVC pipe and fittings shall be joined by primer and solvent-cements in accordance with ASTM D2855. The primer and solvent cement materials shall also meet the requirements for Low VOC emissions in accordance with California SCAQMD Rule 1168/316A.
B. Monitoring probe PVC pipe and fittings shall not be joined with PVC primers and cements. Monitoring probe PVC pipes and fittings may be joined using threaded fittings, rubber couplings, or other Engineer-approved alternative that results in a watertight connection designed for use in underground applications (e.g., Fernco fittings).
C. All burrs, chips, etc., shall be removed from pipe interior and exterior
D. All loose dirt and moisture shall be wiped from the interior and exterior of the pipe end and the interior of fittings.
E. All PVC pipe cuts shall be square and perpendicular to the centerline of the pipe.
F. PVC pipe and fittings shall be selected so that there will be as small a deviation as possible at the joints, and so inverts present a smooth surface. PVC pipe and fittings that do not fit together to form a tight fit will be rejected.
3.5 VENT STRIP INSTALLATION
A. Vent strip installation shall conform to these Specifications and the Manufacturer’s recommendations.
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
VIMS PIPING 13 3392 - 6

B. Vent strip shall be installed with the flat base side of the core placed down on the prepared
subgrade.
C. Only vent strip fittings approved by the manufacturer shall be approved for use.
D. Vent strip shall be joined in accordance with manufacturer’s recommendations.
E. All loose dirt and moisture shall be wiped from the interior and exterior of the vent strip interior and
the interior of fittings.
F. When geotextile fabric is disconnected from the core dimple matting to allow for two sections of vent
strip to be connected, the geotextile fabric shall be re-wrapped around vent strip core and sealed (e.g., using tape) such that the core dimple matting is not exposed and susceptible to clogging or
other damage.
G. All vent strip cuts shall be square and perpendicular to the centerline of the vent strip.
H. Fittings shall be selected so that there will be as small a deviation as possible at the joints, and so inverts present a smooth surface. Vent strip and fittings that do not fit together to form a tight fit will
be rejected.
I. Vent strip shall not be routed through concrete walls or footings, if needed air transfer pipes shall
be used, made from solid PVC transfer pipe and sleeved in accordance with manufacturer specifications.
3.6 EXTRACTION RISER INSTALLATION
A. The Contractor shall install the extraction risers in the locations indicated on the Construction Drawings.
B. The Contractor shall install temporary caps on risers or any exposed piping during the construction process to prevent water and/or debris from accumulating inside the piping and to prevent workers from accidentally dropping tools or trash down the open pipe ends.
C. Exposed, unfinished above-grade piping shall be clearly marked and noticeable (e.g., flagging, paint) to prevent unintentional damage from heavy equipment traffic.
D. Extraction risers shall be secured to the building in accordance with the Construction Drawings, architectural requirements, and local building code.
E. Horizontal sections of vent riser piping installed inside of buildings are not anticipated. However, should they be required, horizontal pipe sections shall be minimized. In locations where horizontal vent riser piping is required, slope pipe 1% toward the suction point (i.e., to where the vent riser pipe penetrates the slab).
F. The exhaust point of the riser pipe above the roof shall be at least: 1. 10 feet horizontally from any HVAC air intakes or other openings into the building; 2. 18 inches above the building roof and immediately adjacent roof; 3. 6 feet horizontally from parapet walls; and 4. 6 inches above adjacent parapet walls if within 10 feet of a parapet wall.
G. Extraction riser pipes shall be directed vertically and terminate through a bird screen as indicated on the Construction Drawings.
H. The Contractor shall paint exposed PVC pipe with ultraviolet (UV) resistant paint.
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VIMS PIPING 13 3392 - 7

3.7 AIR INLET INSTALLATION
A. The Contractor shall install the air inlets in the locations indicated on the Construction Drawings.
B. The air inlets shall terminate with a varmint guard screen as indicated on the Construction Drawings.
C. The Contractor shall paint exposed PVC pipe with UV resistant paint.
D. The Contractor shall install temporary caps on air inlet piping or any exposed piping during the construction process to prevent water and/or debris from accumulating inside the piping and to prevent workers from accidentally dropping tools or trash down the open pipe ends.
3.8 REMOTE SUBSLAB VAPOR MONITORING INSTALLATION
A. The Contractor shall install the remote subslab vapor monitoring probe (“remote monitoring probe”)
and conduit in the locations indicated on the Construction Drawings.
B. Remote monitoring probe PVC pipe conduit and fittings shall not be joined with PVC primers and cements. Remote monitoring probe PVC pipes and fittings may be joined using threaded fittings, rubber couplings, or other Engineer-approved alternative that results in a watertight connection acceptable for use in underground applications (e.g., Fernco fittings).
C. The interior of the remote monitoring probe conduit shall contain ¼-inch O.D. Nylaflow tubing and 6-
inch stainless soil gas implants as indicated on the Construction Drawings.
D. Compression fittings shall be used for tubing-to-tubing connections as indicated on the Construction
Drawings. Compression or barb fittings are sufficient for tubing-to-implant connections. Tubes shall
be labeled with the monitoring probe ID at every compression fitting.
E. Remote monitoring probe conduit and tubing shall terminate with stainless steel shut-off ball valves
via compression fittings in flush-mounted vaults as indicated on the Construction Drawings.
F. The remote monitoring probe flush-mounted vaults shall be labeled with the monitoring probe ID.
G. The Contractor shall not install sample valves (e.g., stainless steel ball valves) on the remote
monitoring probe until a protective manhole cover is installed over the sample location. Temporary
PVC pipe end caps (or equivalent) shall be installed in the exposed PVC conduit prior to the
installation of the manhole cover to prevent unintended accumulation of water and/or debris in the
subslab probe. Once the protective manhole cover is installed and has cured with the surrounding
concrete slab, sample valves may be installed.
3.9 COMMUNITY CENTER SUBSLAB VAPOR MONITORING INSTALLATION
A. The Contractor shall install the subslab vapor monitoring probe at the locations indicated on the
Construction Drawings. The subslab vapor monitoring probe shall consist of a Vapor Pin® installed
within a Vapor Pin Insert.
B. Prior to pouring the slab, the Contractor shall install a Vapor Pin Insert through the geomembrane
vapor barrier per manufacturer standard operation procedures, as indicated on the Construction
Drawings.
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VIMS PIPING 13 3392 - 8

C. After the slab is poured, the Contractor shall install a Vapor Pin in the Vapor Pin Insert, per
manufacture standard operation procedure, as indicated on the Construction Drawings.
3.10 DRY CONDUIT SEALS
A. Electrical cable, telephone, and other dry conduit shall be end sealed at the closest conduit joint
inside the building prior to penetrating the slab with closed cell expanding foam as indicated on the
Construction Drawings.
3.11 QUALITY CONTROL TESTING
A. The Contractor or their selected representative (as approved by the Engineer) shall perform air flow
checks on the installed components of the remote monitoring probe tubing prior to covering the
remote monitoring probes. A vacuum pump shall be connected to the end of the remote monitoring
probe tubing prior to connecting a subsequent section of tubing and/or covering the conduit and
tubing with overlying materials.
1. The ball valve nearest to the 6-inch soil gas implant shall be closed and the opposite end of
the monitoring tubing shall be connected to a vacuum pump. With the referenced ball valve
closed, the vacuum pump shall purge the tubing such that a vacuum of approximately 5-8
inches of mercury is developed in the sample line, after which the sample pump shall be
turned off. The vacuum shall be monitored for a minimum of 1 minute. If the vacuum
dissipates (indicated by a reduction in vacuum of more than 5%), it is an indication of a leak
that shall be rectified prior to proceeding. Once all leaks are identified, repaired, and it is
confirmed that vacuum can be maintained within the sample tubing for at least one minute,
the ball valve nearest the soil gas implant can be opened and the sample tubing line purged
of at least three equipment volumes of air. If three volumes of air is readily purged from the
line, this indicates a passed monitoring probe test. Following confirmation testing, the ball
valve nearest the soil gas implant may be removed, the soil gas implant reattached, and
tubing shall be promptly covered and protected.
3.12 PROTECTION OF WORK
A. The Contractor shall use all means necessary to protect all work of this Section.
B. In the event of damage, the Contractor shall make all repairs and replacements necessary to the satisfaction of the Engineer.
C. Solvent and/or fuel spills on or within the pipes and/or trenches shall be remediated to the satisfaction of the Environmental Consultant. Materials (geotextile, rock, pipe, and/or subgrade) impacted by the spills shall be removed from within the footprint of the VIMS and disposed of in accordance with local regulations.

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
VIMS PIPING 13 3392 - 9

TABLE 3392-1
VENT STRIP REQUIREMENTS

Properties Qualifiers Units Specified
Values Test Method
Sieve

[END OF SECTION]

SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
GEOMEMBRANE 13 3393 - 1

SECTION 13 3393
GEOMEMBRANE VAPOR BARRIER
PART 1 — GENERAL
The Vapor Intrusion Mitigation System (VIMS) Geomembrane Vapor Barrier Technical Specifications
presented herein shall be used in the construction of the VIMS for Sawmill Hollow Brownfields property as
shown on the Construction Drawings.
1.1 DESCRIPTION OF WORK
A. The Geosynthetic Installer shall attend the pre-construction meeting at the site and prior to the
commencement of construction activities. This meeting will be held in accordance with the
requirements stipulated in the Construction Quality Assurance (CQA) Plan.
B. The Geosyntec Installer shall furnish all labor, materials, tools, supervision, transportation,
equipment, and incidentals necessary for the installation of geomembrane vapor barrier as shown
on the Construction Drawings. The work shall be carried out as specified herein and in accordance
with Construction Drawings.
C. The work shall include, but not be limited to, delivery, storage, placement, anchorage, and seaming
of the geomembrane vapor barrier.
1.2 RELATED SECTIONS
A. Section 13 3390 — Geotextile
B. Section 13 3391 — Venting Aggregate
C. Section 13 3392 — VIMS Piping
D. Section 13 3394 — Wind-Driven Turbines, VIMS Fans, Differential Pressure Sensor, and
Telemetry
1.3 REFERENCES
A. General:
1. The following documents form part of the Specifications to the extent stated. Where differences exist between codes and standards, the Contractor shall request clarification from the Engineer as to which applies. 2. Unless otherwise noted, the referenced standard edition is the current one at the time of commencement of the Work.
B. Construction Documents: Vapor Intrusion Mitigation System Design: Sawmill Hollow Property
(Geosyntec Consultants of NC, PC [Geosyntec], 2024).
C. Construction Quality Assurance Plan (CQA Plan), Geosyntec (submitted as part of the Vapor
Intrusion Mitigation System Design: Sawmill Hollow Property, 2024).
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D. Latest version of the ASTM International (ASTM) standards:
1. ASTM D412 Standard Test Method for Vulcanized Rubber and Thermoplastic Elastomers -
Tension.
2. ASTM D413 Standard Test Methods for Rubber Property - Adhesion to Flexible Substrate.
3. ASTM D1709 Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling
Dart Method.
4. ASTM D5199 Standard Test Method for Measuring Nominal Thickness of Geosynthetics.
5. ASTM D5994 Standard Test Method for Measuring Core Thickness of Textured
Geomembranes.
6. ASTM E96 Standard Test Methods for Water Vapor Transmission of Materials.
7. ASTM E154 Standard Test Methods for Water Vapor Retarders Used in Contact with Earth
under Concrete Slabs, on Walls, or as Ground Cover.
1.4 QUALIFICATIONS
A. Geomembrane Vapor Barrier Manufacturer (Manufacturer):
1. The Manufacturer shall be responsible for the production of the components of the
geomembrane vapor barrier materials and shall provide material meeting the requirements
of this Section and the construction schedule for this project.
2. The Prequalified Manufacturers are (in alphabetical order by company name):
a. CETCO; 2870 Forbs Avenue; Hoffman Estates, IL 60192; [phone].
b. EPRO; 1328 E Kellogg Dr., Wichita, KS 67211; [phone].
c. Land Science, 1011 Calle Sombra, San Clemente, CA 92673; [phone].
B. Geosynthetics Installer:
1. The Geosynthetics Installer, which is subcontracted to the Contractor, shall be responsible
for and shall provide sufficient resources for field handling, deploying, seaming, temporarily
restraining (against wind), and other aspects of the deployment and installation of the
geomembrane vapor barrier materials and other geosynthetic components of the project.
2. The Geosynthetics Installer shall have successfully completed a training course provided
by the Manufacturer and shall have installed a minimum of 2,000,000 square feet (ft2) of
geomembrane vapor barrier on previous projects.
3. The Superintendent shall have supervised the installation of a minimum of 1,000,000 ft2 of
geomembrane vapor barrier on at least five different projects.
1.5 WARRANTY
A. The Geosynthetic Installer shall furnish the Engineer a written warranty against defects in materials.
B. The Geosynthetic Installer shall furnish the Engineer with a 1-year written warranty against defects
in workmanship.
1.6 SUBMITTALS
A. The Geosynthetic Installer shall submit the following documentation to the Engineer for approval.
1. List of material properties, including test method.
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B. The Geosynthetic Installer shall submit certificates of compliance certifying that the
geomembrane vapor barrier materials meet the requirements outlined herein.
C. The Geosynthetic Installer shall submit the following information to the Engineer for approval at
least 14 days prior to mobilization.
1. Installation schedule.
2. Copy of Geosynthetic Installer's letter of approval or license by the Manufacturer.
3. Installation capabilities, including:
a. information on equipment proposed for this project;
b. average daily production anticipated for this project; and
c. quality control procedures.
4. In accordance with Part 1.4, a resume of the Superintendent to be assigned to this project,
including dates and duration of employment, shall be submitted at least 14 days prior to
beginning geomembrane vapor barrier installation.
D. During installation, the Geosynthetic Installer shall be responsible for the timely submission to the
Engineer of:
1. Quality control documentation; and
2. Venting aggregate acceptance certificates, signed by the Geosynthetic Installer, for each
area to be covered by geosynthetic materials.
E. Upon completion of the installation, the Geosynthetic Installer shall be responsible for the
submission to the Engineer of a warranty from the Geosynthetic Installer as specified in Part 1.5 of
this Section.
1.7 QUALITY ASSURANCE
A. The Geosynthetic Installer shall ensure that the materials and methods used for installation of the
geomembrane vapor barrier meet the requirements of the Construction Drawings and this Section.
Any material or method that does not conform to these documents, or to alternatives approved in
writing by the Engineer, will be rejected and shall be repaired or replaced by the Geosynthetic
Installer.
B. The Geosynthetic Installer shall be aware of and accommodate all monitoring and conformance
testing required by the CQA Plan. The CQA Consultant (e.g., the CQA Field Monitor) will observe
this monitoring, which may also include random testing of construction materials and completed
work. If nonconformances or other deficiencies are found in the Geosynthetic Installer’s materials
or completed work, the Geosynthetic Installer will be required to repair the deficiency or replace the
deficient materials.

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PART 2 — PRODUCTS
2.1 GEOMEMBRANE VAPOR BARRIER PROPERTIES
A. The geomembrane vapor barrier shall have properties that comply with the values shown in Table
3393-1. The geomembrane vapor barrier shall be seamed and attached to the building foundation
using spray-applied materials having property values compliant with the minimum requirements
listed in Table 3393-1.
2.2 TRANSPORTATION, HANDLING, AND STORAGE
A. Handling and care of the geomembrane vapor barrier prior to and following installation at the site
shall be the responsibility of the Geosynthetic Installer. The Geosynthetic Installer shall be liable for
all damage to the materials incurred prior to final acceptance of the geomembrane vapor barrier by
the Engineer.
B. The Geosynthetic Installer shall be responsible for storage of the geomembrane vapor barrier
materials at the site.
C. Liquid and spreadable materials must be kept within the manufacturer’s specified temperature
ranges.
1. Proper storage of onsite materials is the responsibility of the Geosynthetic Installer.
Storage area shall be clean, dry, and protected from the elements. If ambient air
temperatures are expected to fall below 40°F, precautions shall be taken to protect any
emulsion product from near freezing temperatures. Protect stored materials from direct
sunlight.
D. Remove and replace liquid and spreadable materials which are not applied within their stated shelf
life.

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PART 3 — EXECUTION
3.1 FAMILIARIZATION
A. Prior to implementing any of the work described in this Section, the Geosynthetic Installer shall
become thoroughly familiar with all portions of the work falling within this Section.
B. Inspection:
1. The Geosynthetic Installer shall carefully inspect the installed work of all other Sections
and verify that all work is complete to the point where the work of this Section may properly
commence without adverse effect.
2. If the Geosynthetic Installer has any concerns regarding the installed work of other
Sections, he/she shall notify the Engineer in writing prior to the start of the work of this
Section. Failure to inform the Engineer in writing or installation of the geomembrane will be
construed as the Geosynthetic Installer’s acceptance of the related work of all other
Sections.
C. A pre-installation meeting shall be held to coordinate the installation of the geomembrane vapor
barrier with the installation of other components of the VIMS and foundation systems.
3.2 SURFACE PREPARATION
A. Concrete surfaces shall have a light broom or smoother finish. Concrete surfaces shall be free of
dirt, debris, loose materials, release agents, curing agents and moisture.
B. Voids in concrete surface deeper and/or wider than ¼ inch shall be filled and allowed to cure
before installation.
C. All concrete form tie holes must be filled with non-shrink grout.
D. Provide a ¾-inch minimum bead of trowel grade or roller-applied geomembrane vapor barrier, or
other equivalent geomembrane vapor barrier material, at all horizontal to vertical transitions and
other inside corners. Allow this material to cure as required by the geomembrane vapor barrier
manufacturer prior to applying the geomembrane vapor barrier seam.
E. Maintenance of equipment and/or storage of potential Chemicals of Concern (fuels, solvents, oils,
etc.) shall not be performed within the footprint of the VIMS.
F. Level and tamp or roll subgrade venting aggregate in accordance with Technical Specifications
Section 13 3391, Venting Aggregate.
G. Cleaning applicator nozzles/pipes shall not be performed directly within or above the VIMS
components. Cleaning shall be performed away from the geomembrane work area to avoid
contamination of the VIMS materials. Waste products generated during cleaning operation shall
be disposed of in accordance with local, state, and Federal regulations.
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3.3 GEOMEMBRANE VAPOR BARRIER INSTALLATION
A. The Geosynthetic Installer shall take care not to entrap dirt beneath the geomembrane vapor
barrier during placement, or dirt/stones above the geomembrane vapor barrier.
B. Geosynthetic Installer shall install the geomembrane vapor barrier in accordance with the
manufacturer requirements.
C. When multiple concrete slab pours will occur, extend the geomembrane vapor barrier a minimum
of 2 feet past the pour joint.
D. The geomembrane vapor barrier shall be overlapped a minimum of 6 inches.
E. At the seam overlap, apply the spray-applied joint compound in a manner that is consistent with
the minimum geomembrane vapor barrier manufacturer specifications.
F. The Geosynthetic Installer shall examine the entire geomembrane vapor barrier surface after
installation to ensure that no foreign objects are present that may damage the geomembrane
vapor barrier or adjacent layers. The Geosynthetic Installer shall remove any such foreign objects
and shall replace any damaged geomembrane vapor barrier.
G. Apply geomembrane vapor barrier to concrete surface in accordance with the Manufacturer’s
requirements. Geomembrane vapor barrier shall be overlapped onto concrete surfaces a
minimum of 6 inches unless otherwise approved by the geomembrane vapor barrier
manufacturer.
H. The Contractor or Geosynthetic Installer shall anchor or weight all carrier geomembrane with
sandbags, or the equivalent, to prevent wind uplift. Soil stockpiles, gravel bags, nails, and/or
stakes shall not be used to anchor carrier geomembrane.
I. Surfaces that will receive the spray-applied product or taped product must be clean and free from
standing moisture.
J. Geomembrane vapor barrier shall not be placed during any precipitation, in the presence of
excessive moisture (e.g., dew, heavy fog that deposits dew on the geomembrane vapor barrier),
in an area of ponded water, or in the presence of winds in excess of 20 miles per hour.
K. The Geosynthetic Installer shall ensure that:
1. No vehicular traffic is allowed on the geomembrane vapor barrier.
2. Equipment used does not damage the geomembrane vapor barrier by handling, trafficking, or
leakage of hydrocarbons (i.e., fuels).
3. Personnel working on the geomembrane vapor barrier do not smoke, wear damaging shoes,
bring glass onto the geomembrane vapor barrier, or engage in other activities that could
damage the geomembrane vapor barrier.
4. The geomembrane vapor barrier is protected from damage in heavily foot trafficked areas.
5. No stakes, posts, and/or bulkheads are driven through the geomembrane vapor barrier.
L. Geomembrane vapor barrier shall be overlapped a minimum of 12 inches when application
process is interrupted for more than 8 hours. The overlap area shall be cleaned of dust, dirt and
other materials that may affect the quality of the geomembrane vapor barrier.
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M. The geomembrane vapor barrier shall be applied in accordance with the manufacturer’s allowable
temperature range requirements.
3.4 PENETRATIONS IN THE GEOMEMBRANE VAPOR BARRIER
A. All penetrations through the geomembrane vapor barrier shall be cleaned and prepared in
accordance with the Manufacturer’s requirements.
B. Cut geomembrane vapor barrier around penetration so that the geomembrane vapor barrier lies flat
on the Venting Aggregate and/or other applicable foundation components.
C. Seal utility penetration to prepared geomembrane vapor barrier in accordance with the
Manufacturer’s requirements. Spray apply 60-mil thick geomembrane vapor barrier and allow to
cure.
D. Install and tighten cable tie at top of geomembrane vapor barrier. Trim excess cable tie after
tightening.
3.5 GEOMEMBRANE VAPOR BARRIER REPAIR
A. Voids left by sampling or other damage shall be repaired by patching with geomembrane vapor
barrier overlapped a minimum of 6 inches beyond the edge of the defect. Geomembrane vapor
barrier seal material (spray, as appliable) shall then be applied at least 3-inches beyond the edge
of the geomembrane vapor barrier unless otherwise required by the geomembrane vapor barrier
manufacturer.
B. Inspect damaged area to determine which system components have been damaged.
C. If the geomembrane vapor barrier has been compromised, patch the areas that have been
damaged by re-installing new materials in place of damaged materials. The patch shall extend a
minimum of 6 inches beyond the damaged area in all directions.
D. Punctures of the geomembrane shall be repaired by sealing the punctures following
geomembrane manufacturer recommendations with materials approved by the geomembrane
manufacturer.
E. The Engineer shall be notified prior to all geomembrane repairs, including those required after
the concrete slab is poured.
3.6 SLAB REPAIR REMOVAL
A. Floor slab removal is not part of this work. If in the future, a portion of the floor slab must be removed,
the Geosynthetic Installer should review the general work sequence for floor slab removal/repair
sequence shown on the Construction Drawings and should consult with the architect and the structural
engineer to determine the requirements for replacing the floor slab concrete (e.g., the need for dowels
and the appropriate concrete specification, concrete finishing, and concrete curing).
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B. All post-slab installation repairs affecting the VIMS shall be completed by the Geosynthetic Installer
and repairs shall be documented in writing to be consistent with geomembrane manufacturer
requirements. Repairs affecting the VIMS shall be monitored by the VIMS CQA Consultant.
C. If a portion of the floor slab must be removed, the vicinity of the floor slab area to be removed shall be
ventilated as needed and the air exhausted outside the building in a safe manner until the
geomembrane vapor barrier has been replaced.
D. While ventilating the vicinity of the floor slab removal area as needed, the concrete to be removed
shall be saw cut into manageable pieces per the slab repair details in the Construction Drawings. Slab
pieces shall be removed without damaging adjacent floor slab areas.
E. After the floor slab has been removed and the required subslab work performed (e.g., subslab utility
modifications), subgrade materials shall be replaced and compacted as required by the geotechnical
engineer. Then, new geomembrane vapor barrier material shall be installed equivalent/in-kind with
the original geomembrane vapor barrier installed. The section of replaced geomembrane vapor barrier
shall be placed beneath the existing geomembrane vapor barrier at the perimeter of the saw cut
opening, and the joint between the existing and new geomembrane vapor barriers shall be sealed
according to manufacturer requirements. After the new and original geomembrane vapor barriers
have been sealed together per manufacturer requirements and these Construction Drawings, and as
observed by the VIMS CQA Consultant (or their direct representative), the floor slab concrete and
steel reinforcement, if any, can be replaced per the requirements of the architect and the structural
engineer.
3.7 SEALING OF JOINTS, CRACKS, AND OPENINGS IN THE SLAB
A. The intent of slab sealing is to aid in the performance of the VIMS and minimize the leakage of gas
between the subslab and the indoor air space of the building.
B. All floor slab penetrations including but not limited to expansion joints, control joints, construction joints,
open cracks, plumbing and electrical conduits, venting system pipes, etc. shall be sealed using
urethane caulk according to manufacturer's recommendations.
C. The annulus of all utilities, pipes, and other conduits that penetrate the floor slab, including the riser
pipes, shall be sealed with a urethane caulk according to manufacturer's recommendations and in a
manner meeting applicable fire codes.
D. All openings in the floor slab greater than ½ inch shall be sealed using suitable expanding foam
sealants or approved equal.
E. All openings in the slab, such as openings created by plumbing box outs for tubs, showers, or drains
shall be sealed using expanding foam sealants or urethane caulk.
3.8 GEOMEMBRANE VAPOR BARRIER QUALITY CONTROL TESTING
A. Upon completion of cure time of a section of the geomembrane vapor barrier, the Geosynthetic
Installer shall smoke test the geomembrane for leaks. The smoke test shall be performed once for
approximately every 2,000 ft2 of installed geomembrane vapor barrier or per mitigated footprint,
whichever is smaller. Leaks shall be repaired prior to installing any overlying materials.
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B. If the selected geomembrane vapor barrier is a full spray-applied barrier application (as opposed to a
geomembrane vapor barrier that is only sprayed at the seams, utility penetrations, and foundation, for
example), then coupon thickness testing is required to verify sufficient thickness of the spray
application. In this case, upon completion of cure time of a section of the geomembrane vapor barrier,
the Geosynthetic Installer shall collect coupon samples of geomembrane to evaluate the total
geomembrane vapor barrier thickness. The Geosynthetic Installer shall re-spray areas that are thinner
than the geomembrane vapor barrier manufacturer minimum thickness requirements and patch the
coupon location consistent with the geomembrane vapor barrier repair requirements. The thickness
test shall be performed once for approximately every 2,000 ft2 of installed geomembrane vapor
barrier. Leaks shall be repaired prior to installing any overlying materials.
C. The smoke leak testing and coupon thickness testing (if applicable) is the responsibility of the
Geosynthetic Installer and will be observed by the CQA Consultant.
3.9 MATERIALS IN CONTACT WITH THE GEOMEMBRANE VAPOR BARRIER
A. The Geosynthetic Installer shall take all necessary precautions to ensure that the geomembrane
vapor barrier is not damaged during its installation or during the installation of overlying materials.
B. All attempts shall be made to minimize wrinkles in the geomembrane vapor barrier.
C. Equipment shall not be driven directly on the geomembrane.
3.10 GEOMEMBRANE VAPOR BARRIER ACCEPTANCE
A. The Geosynthetic Installer shall retain all ownership and responsibility for the geomembrane vapor
barrier until accepted by the Owner.
B. The geomembrane shall be accepted by the Owner when:
1. The installation is completed;
2. All documentation is submitted;
3. The associated construction quality control and construction quality assurance testing is
complete; and
4. All warranties are submitted to the owner.
3.11 PROTECTION OF WORK
A. The Geosynthetic Installer shall use all means necessary to protect all work of this Section.
B. In the event of damage, the Geosynthetic Installer shall make all repairs and replacements
necessary to the satisfaction of the Engineer.
C. In the event of damage, including spillage of Chemicals of Concern (e.g., fuels, oils, solvents,
etc.) on the geomembrane vapor barrier, the Geosynthetic Installer shall immediately make all
repairs and replacements necessary to the approval of the Engineer and/or CQA Consultant.
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TABLE 3393 - 1
REQUIRED GEOMEMBRANE VAPOR BARRIER PROPERTIES

minimum --
Notes:
1. Battista and Row, “Evaluation of Diffusion of PCE and TCE Through High Performance
Geomembranes”, Queens University, 2018
2. The Queens University permeance/diffusion testing results are not directly comparable to other
geomembrane vapor barrier diffusion tests that have been performed in the literature.
Geomembrane vapor barriers that have been evaluated for PCE permeance using alternative
methods may be acceptable pending Engineer review and approval.

[END OF SECTION]

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WIND DRIVEN TURBINE, FANS AND TELEMETRY 13 3394 - 1

SECTION 13 3394
WIND-DRIVEN TURBINES, VIMS FANS, DIFFERENTIAL PRESSURE SENSOR, AND
TELEMETRY
PART 1 — GENERAL
The Vapor Intrusion Mitigation System (VIMS) Wind-Driven Turbines, VIMS Fans, Differential Pressure
Sensor, and Telemetry Technical Specifications presented herein shall be used in the construction of the
VIMS for the Sawmill Hollow Brownfields property as shown on the Construction Drawings. Wind-driven
turbines will only be installed at a building following written authorization from the North Carolina
Brownfields Redevelopment Section (BRS); otherwise, VIMS fans will be installed. Technical specifications
for wind-driven turbines are provided herein in the anticipation that wind-driven turbines may be installed in
the future.
1.1 DESCRIPTION OF WORK
A. The Contractor shall attend a pre-construction meeting at the site and prior to the commencement
of the fan, wind-driven turbine, differential pressure sensor, and telemetry system installation
activities. This meeting will be held in accordance with the requirements stipulated in the
Construction Quality Assurance (CQA) Plan.
B. The Contractor shall furnish all labor, materials, tools, supervision, transportation, equipment, and
incidentals necessary for the installation of the wind-driven turbines, fans, differential pressure
sensors, and telemetry system. The work shall be carried out as specified herein and in accordance
with the Construction Drawings.
C. The work shall include, but not be limited to, delivery, storage, installation, and testing of the
wind-driven turbines, fans, differential pressure sensors, and telemetry system.
D. Once all joint, penetration, conduit and other sealing as required by the VIMS Technical
Specifications is completed by the Contractor and approved by the CQA Consultant, VIMS
operational evaluation testing will be performed by or under the supervision of the VIMS Engineer.
E. The Contractor shall install the design fans as indicated herein and conduct start-up testing. Start-
up testing shall be completed by the Contractor and will be observed by the CQA Consultant. The
purpose of start-testing is to confirm fan operation and, if necessary, calibrate the VIMS fans as
required by the Engineer.
1.2 RELATED SECTIONS
A. Section 13 3390 — Geotextile
B. Section 13 3391 — Venting Aggregate
C. Section 13 3392 — VIMS Piping
D. Section 13 3393 — Geomembrane Vapor Barrier
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1.3 REFERENCES
A. General:
1. The following documents form part of the Specifications to the extent stated. Where differences exist between codes and standards, the Contractor shall request clarification from the Engineer as to which applies. 2. Unless otherwise noted, the referenced standard edition is the current one at the time of commencement of the Work.
B. Construction Documents: Vapor Intrusion Mitigation System Design: Sawmill Hollow Property
(Geosyntec Consultants of NC, PC [Geosyntec], 2024).
C. Construction Quality Assurance Plan (CQA Plan), Geosyntec (submitted as part of the Vapor
Intrusion Mitigation System Design: Sawmill Hollow Property, 2024).
1.4 QUALIFICATIONS
A. The Contractor shall be a well-established firm(s) with documented experience with fan and
wind-driven turbine installations, including mechanical and electrical components, differential
pressure sensors, and telemetric monitoring systems.
1.5 SUBMITTALS
A. The Contractor shall submit to the Engineer, at least 7 days prior to the delivery of the wind-driven
turbines, fans, differential pressure sensors, and telemetry system the following information:
1. Manufacturer and product name;
2. Technical specifications; and
3. Operations and Maintenance Manual.
B. The Contractor shall submit to the Engineer, record drawings of the installed fans, including both
horizontal and vertical locations.
1.6 CONSTRUCTION QUALITY ASSURANCE MONITORING
A. The Contractor shall ensure that the wind-driven turbine and fan installation methods meet the
requirements of the Construction Drawings and this Section. Any material or method that does not
conform to these documents, or to alternatives approved in writing by the Engineer, will be rejected
and shall be repaired or replaced by the Contractor.
B. The Contractor shall be aware of and accommodate all performance testing required by the CQA
Plan. The Engineer will perform this testing. If nonconformances or other deficiencies are found in
the Contractor’s equipment or completed work, the Contractor will be required to repair the
deficiency or replace the deficient equipment.

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PART 2 — PRODUCTS
2.1 WIND-DRIVEN TURBINE SPECIFICATIONS
A. Assembly for wind-driven turbines will consist of a 4-inch wind-driven turbine (made of galvanized
steel construction capable of generating at least 120 cubic feet per minute at 4 miles per hour wind
speed) mounted on top of the respective vapor extraction pipe. To allow for contingent active
operation, 110-volt (V) and 20-ampere (amp) power supply and low-voltage wiring will be provided
within 5 feet of the wind-driven turbine location, inclusive of weather tight electrical housing with a
shut-off switch. A 1/2-inch NPT threaded plug on the intake side of the wind-driven turbine will be
installed as indicated in the Construction Drawings.
2.2 VIMS FAN SPECIFICATIONS
A. Assembly for fans will include a radon-style mitigation fan (specific product to be specified by the
Engineer following diagnostic testing), 110V and 20 amp power supply within 5 feet of the fan,
weather tight electrical housing with a rheostat (e.g., rotary dimmer switch) and shut-off switch,
differential pressure sensor for monitoring fan vacuum, low voltage wire for interface with the VIMS
telemetry system, and a ½-inch NPT threaded plug on the intake side of the fan as indicated on the
Construction Drawings.
2.3 DIFFERENTIAL PRESSURE SENSOR AND TELEMETRY SYSTEM SPECIFICATIONS
A. A differential pressure sensor shall be installed on the extraction pipe of each fan near ground
level (on the intake side of the fan) as indicated in the Construction Drawings. The differential
pressure transmitter shall communicate with a telemetry system for notifying building maintenance
or an authorized representative if the vacuum in the extraction pipe decreases below a minimum
setpoint value. The set point value shall be specified by the VIMS Engineer. These alerts are
important to inform maintenance personnel if the fan is not operating per design (e.g., fan was
turned off or damaged).
B. The VIMS telemetry monitoring system may be integrated with the Building Management System
(BMS), a dedicated VIMS telemetry monitoring system (e.g., Sensaphone Sentinel), or other
automated monitoring approach as approved by the VIMS Engineer. The telemetry system (BMS
or otherwise) shall be on a different circuit breaker than the VIMS fans and operate 24 hours, 7 days
a week. The VIMS telemetry system shall be able to send notifications via email, voice call, or text
message to a mobile phone.
2.4 MANUFACTURING QUALITY CONTROL
A. The wind-driven turbines, fans, differential pressure sensors, and telemetry system shall be
manufactured with quality control procedures that meet or exceed generally accepted industry
standards.
B. The Manufacturer shall test the fans and wind-driven turbines (if applicable) prior to delivery to the
site.
C. The Manufacturer shall comply with the certification and submittal requirements of this Section.
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2.5 PACKING AND LABELING
A. Fans, wind-driven turbines, differential pressure sensors, and telemetry system shall be delivered
in their original packaging.
B. Fans, wind-driven turbines, differential pressure sensors, and telemetry system shall be marked or
tagged with the following information:
1. manufacturer's name; and
2. product identification;
2.6 TRANSPORTATION, HANDLING, AND STORAGE
A. The Contractor shall be liable for any damage to the fans, wind-driven turbines, differential pressure
sensors, and telemetry system incurred prior to and during transportation to the site.
B. Handling, unloading, storage, and care of the fans, wind-driven turbines, differential pressure
sensors, and telemetry system prior to and following installation at the site is the responsibility of
the Contractor. The Contractor shall be liable for any damage incurred prior to final acceptance by
the Engineer.
C. The fans, wind-driven turbines, differential pressure sensors, and telemetry system shall be
protected from any damaging or deleterious conditions. The fans, wind-driven turbines, differential
pressure sensors, and telemetry system shall be protected from mud, dirt, and dust. Any additional
storage procedures required by the Manufacturer(s) shall be the responsibility of the Contractor.
D. The Contractor shall be responsible for storage of the fans, wind-driven turbines, differential
pressure sensors, and telemetry system at the site.

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WIND DRIVEN TURBINE, FANS AND TELEMETRY 13 3394 - 5

PART 3 — EXECUTION
3.1 FAMILIARIZATION
A. Prior to implementing any of the work described in this Section, the Contractor shall become
thoroughly familiar with the site, the site conditions, and all portions of the work falling within this
Section.
B. Inspection:
1. The Contractor shall carefully inspect the installed work of all other Sections and verify that
all work is complete to the point where the installation of this Section may properly
commence without adverse impact.

2. If the Contractor has any concerns regarding the installed work of other Sections, he/she
shall notify the Engineer in writing prior to commencing the work. Failure to notify the
Engineer prior to the installation of the fans and wind-driven turbines will be construed as
Contractor’s acceptance of the related work of all other Sections.
3.2 HANDLING AND INSTALLATION
A. The Contractor shall not begin fan or wind-driven turbine installation until all QC/QA documentation
is complete for the installation of the vapor extraction pipes.
B. The Contractor shall handle all fans, wind-driven turbines, differential pressure sensors, and
telemetry system in such a manner that they are not damaged in any way.
C. Fans shall be installed near grade, as shown on the Construction Drawings. Wind-driven turbines,
if installed, shall be installed on the top of the respective vapor extraction pipe as shown on the
Construction Drawings.
D. Support for the fans (e.g., Unistrut anchors) shall be provided if needed per the requirements of the
roofing consultant, mechanical/electrical/plumbing designer, and local building code.
E. The fan discharge point shall be directed upwards, contain a bird screen with ½” openings, and
exhaust a minimum of 10 feet from any building opening or building intake (e.g., window, door,
louver, HVAC), 18 inches above the building roof and immediately adjacent roof, at least 6 feet
horizontally from parapet walls, and at least 6 inches above adjacent parapet walls if within 10 feet
of a parapet wall.
F. Power to the fans shall not be on the same circuit as the telemetry monitoring system.
G. Upon completion of the mechanical installation, the electrical tie-in shall be completed by a licensed
electrician.
H. Provide electric service with a dedicated circuit breaker at an electric junction box within five feet of
the fan.
I. The differential pressure sensors and telemetry system shall be accessible for routine operations
and maintenance.
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
WIND DRIVEN TURBINE, FANS AND TELEMETRY 13 3394 - 6

J. The electrical components of the differential pressure sensors and telemetry system shall be
installed by a licensed electrician and in accordance with the local building code.
K. The Contractor shall perform start-up testing of the installed fans and wind-driven turbines to confirm
the VIMS is operating consistent with the intended design by the Engineer. Upon start up, fan shall
be allowed to run for a minimum of five minutes upon installation. The disconnect switch will be
tested to ensure it stops operation of the fan. The rheostat installed on the fan will be dialed up and
down to test the operation. The fan should increase/decrease exhaust air velocity following changes
in the rheostat setting. The fan inner housing will be inspected for leaks during startup. Contractor
shall remove any foreign objects and shall replace any damages.
3.3 DIFFERENTIAL PRESSURE SENSOR/TRANSMITTERS AND ALARM SYSTEM
A. The differential pressure alarm system shall consist of a differential pressure sensor/transmitter and
a system controller that is capable of telemetric signal.
B. Permanent differential pressure sensors/transmitters calibrated to measure a vacuum from 0 to 10
inches of water column (in WC) shall be installed on each riser pipe as indicated in the Construction
Documents.
C. The differential pressure transmitter shall signal two alarms if a monitored vacuum level decreases
below a setpoint value. One alarm shall be a notification alarm to building maintenance or an
authorized representative. The other alarm shall be a local audible/visual alarm at a central location
(e.g., the telemetry system). Alarms shall be set to be activated when the measured vacuum falls
to a level determined by the VIMS Engineer based on the VIMS operational evaluation.
D. The telemetry monitoring system shall be able to send notifications via email, voice call, or text
message to a mobile phone.
E. The differential pressure transmitter and telemetry monitoring system shall be accessible for routine
operations and maintenance as indicated on the Construction Drawings and in locations as
approved by the architect and building owner.
E. The telemetry monitoring system, or alternative energy source, shall provide power to the differential
pressure sensors.
F. The telemetry monitoring system shall be provided with an outlet within 3 feet of the mounting
location that supplies 110V power.
G. The telemetry monitoring system shall have a backup battery rated for a minimum of 8-hours for
standby mode plus 5 minutes of alarm under full load condition. Backup power shall be available
within 60 seconds of primary power loss.
H. An ethernet cable with an internet connection will be provided by others to be enable the telemetric
features of the telemetry monitoring system. Alternatively, a localized Wi-Fi hub or a cellular modem
may be connected to the telemetry monitoring system for remote internet access.
I. Wiring shall be in accordance with the local Electrical Code.
SAWMILL HOLLOW BROWNFIELDS PROPERTY CONSTRUCTION DOCUMENTS June 2024
WIND DRIVEN TURBINE, FANS AND TELEMETRY 13 3394 - 7

3.4 PROTECTION OF WORK
A. The Contractor shall use all means necessary to protect all work of this Section.
B. In the event of damage, the Contractor shall immediately make all repairs and replacements
necessary to the approval of the Engineer.

[END OF SECTION]

APPENDIX C

Construction Quality Assurance Plan for
Vapor Intrusion Mitigation System

Prepared for
Northwestern Housing Enterprises, Incorporated
P.O. Box 1673
Boone, North Carolina 28607

APPENDIX C: CONSTRUCTION
QUALITY ASSURANCE PLAN FOR
VAPOR INTRUSION MITIGATION
SYSTEM
SAWMILL HOLLOW PROPERTY
SAWMILL HOLLOW ROAD
BURNSVILLE, NC
Brownfields Project Number: 26015-22-100

Prepared by
Geosyntec Consultants of NC, P.C.
161 South Lexington Avenue
Asheville, North Carolina 28801

Project Number GN9110

June 2024

Revision 1

GN9110 – Construction Quality Assurance Plan i June 2024
TABLE OF CONTENTS
1. INTRODUCTION ................................................................................................................. 1
1.1 Terms of Reference ...................................................................................................... 1
1.2 Project Overview and Description ............................................................................... 1
1.3 Plan Organization ......................................................................................................... 2
2. QUALITY ASSURANCE AND QUALITY CONTROL OVERVIEW .............................. 3
3. RESPONSIBLE PARTIES AND DEFINITIONS ................................................................ 4
3.1 Responsible Parties ...................................................................................................... 4
3.2 Definitions and Responsibilities................................................................................... 5
4. CQA ORGANIZATION ....................................................................................................... 7
4.1 General ......................................................................................................................... 7
4.2 Project Manager ........................................................................................................... 7
4.3 Construction Manager .................................................................................................. 7
4.4 Vapor Intrusion Mitigation System Design Engineer .................................................. 7
4.5 CQA Consultant ........................................................................................................... 7
4.6 CQA Manager .............................................................................................................. 7
4.7 CQA Field Monitors .................................................................................................... 8
5. MEETINGS ......................................................................................................................... 10
5.1 Pre-Construction Meeting .......................................................................................... 10
5.2 Daily Progress Meetings ............................................................................................ 11
5.3 Resolution Meeting .................................................................................................... 11
5.4 Project Visits .............................................................................................................. 12
6. COMPLIANCE WITH TECHNICAL SPECIFICATIONS ............................................... 13
6.1 Technical Specification Sections ............................................................................... 13
6.2 Material Requirements ............................................................................................... 13
6.3 Submittals .................................................................................................................. 13
6.4 Handling and Placement ............................................................................................ 14
6.5 Installation .................................................................................................................. 14
6.6 Installation of Overlying Materials ............................................................................ 14
6.7 Electrical Requirements ............................................................................................. 15

TABLE OF CONTENTS (CONT’D)

GN9110 – Construction Quality Assurance Plan ii June 2024
6.8 Monitoring Systems ................................................................................................... 15
6.9 Start-Up Testing ......................................................................................................... 15
7. DOCUMENTATION .......................................................................................................... 16
7.1 General ....................................................................................................................... 16
7.2 Daily Record Keeping ................................................................................................ 16
7.2.1 General ........................................................................................................16
7.2.2 Monitoring Logs and Testing Data Sheets ..................................................16
7.2.3 Construction Problems ................................................................................17
7.2.4 Spills ............................................................................................................17
7.3 Photographic Reporting ............................................................................................. 17
7.4 Design, Technical Specifications, and/or Construction Drawing Changes ............... 17
7.5 CQA Report ............................................................................................................... 18

GN9110 – Construction Quality Assurance Plan 1 June 2024
1. INTRODUCTION
1.1 Terms of Reference
Geosyntec Consultants of NC, P.C. (Geosyntec), has prepared this Vapor Intrusion Mitigation
System (VIMS) Construction Quality Assurance (CQA) Plan (CQA Plan) on the behalf of
Northwestern Housing Enterprises, Incorporated (“NHE”, “Prospective Developer” or “PD”) for
the North Carolina Department of Environmental Quality (NCDEQ) Brownfields Redevelopment
Section (BRS) for the Sawmill Hollow Brownfields Property (“Site”). This CQA Plan was
prepared by Morgan Randolph, and was reviewed by Mike Burcham, P.E.(NC, TX) and Todd N.
Creamer, P.G.(NC, CA, PA, WY), in accordance with the review policies of the firm.
1.2 Project Overview and Description
The Site is the 3.86-acre parcel at the intersection of Sawmill Hollow Road and US Highway 19E
in Burnsville, North Carolina identified under Yancey County Parcel Number 083003244675000
(referred to herein as the “Site”). A Letter of Eligibility (LOE) was received for the property on
November 10, 2022, indicating that the Site was eligible for entry into the BRS and for the eventual
finalization of a Brownfields Agreement (BFA). The Site is listed under Brownfields Project No.
26015-22-100. Previous sampling efforts indicate the presence of methane and volatile organic
compounds (VOCs) in soil gas at the Site. Further details of environmental sampling are provided
in the Supplemental Assessment Report (Geosyntec, 2022).
NHE intends to redevelop the Site under the BRS into a rental community including 26 affordable
rental residential units, a community building with amenities, and a playground. In response to the
VOC and methane impacts detected in soil gas at the Site and the planned Site redevelopment,
Geosyntec has prepared a VIMS Design Report (referred to herein as the “Design Report”),
Construction Drawings, Technical Specifications, and this CQA Plan to facilitate redevelopment
of the Site. In response to the methane detected in soil gas, the BRS required that woody debris be
removed from Site prior to redevelopment and that a subsequent methane assessment be conducted
to demonstrate that removing woody debris effectively reduced methane concentrations in soil gas
to acceptable levels, or if further methane assessment would be necessary to define and address
buried woody debris. The methane assessment results indicated that, following woody debris
excavation, methane concentrations in soil gas decreased below 1.25 percent by volume (%v) and
was no longer present at two of the three monitoring locations approximately two months after
excavations were completed. Based on these results, methane is not a target of the VIMS detailed
herein.
VIMS are designed to mitigate each building on Site (the community building and rental unit
footprints C, F, G, and H) as indicated on the Construction Drawings and Figure 3 of the Mitigation
Strategy of the Design Report (Geosyntec, 2024). Each VIMS will operate by providing air flow
underneath the building’s concrete slab. VIMS components for all buildings include an aggregate
venting layer, a geomembrane vapor barrier, cushion geotextiles, vent strip and piping for active
or passive vapor extraction, a monitoring system, and a mechanical fan or wind turbine. The

GN9110 – Construction Quality Assurance Plan 2 June 2024
community building VIMS will also include fresh air inlet vent strip and piping. Post-pour and
pre-occupancy methane screening will be conducted as described in the Design Report and if the
BRS requires methane mitigation then fans, sensors, and alarms for methane mitigation will be
specified and submitted under a separate cover.
Additional details of the VIMS are discussed in the Design Report, Construction Drawings,
Technical Specifications, and this CQA Plan.
1.3 Plan Organization
The remainder of this CQA Plan is organized as follows:
• Section 2, Quality Assurance and Quality Control Overview, outlines the terminology and
the purpose of construction quality insurance and quality control (QA/QC).
• Section 3, Responsible Parties and Definitions, presents the main parties involved and
defines the project terminology.
• Section 4, CQA Organization, presents the personnel titles and their responsibilities for
this project.
• Section 5, Meetings, specifies meetings to be held and the attendees and items addressed
at each meeting.
• Section 6, Compliance with Technical Specifications, describes the CQA activities
involved with the installation of the various components of the VIMS.
• Section 7, Documentation, specifies the means and frequency by which information shall
be recorded during construction of the VIMS.

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2. QUALITY ASSURANCE AND QUALITY CONTROL OVERVIEW
Construction Quality Assurance (CQA) and Construction Quality Control (CQC) involve the
monitoring and testing of materials and construction to document that the final product is
constructed in accordance with the Construction Drawings and Technical Specifications
(Construction Documents). While CQA and CQC are similar, and often referenced simultaneously
(i.e., CQA/CQC), each is intended to serve a slightly different purpose.
The common thread between CQA and CQC is the monitoring and testing of materials and
construction activities used to document that the final product has been constructed in accordance
with the Construction Documents. The difference between CQA and CQC is the party who is
responsible for performing the duties. A third party, independent of the contractor and hired by the
owner, typically performs CQA. CQC is usually performed by the contractor, or a party hired by
the contractor, to aid the contractor in constructing a quality product. CQA information may be
used to complement the Contractor’s CQC function, in correcting work that does not satisfy project
requirements.
Materials used to construct the VIMS must meet or exceed the criteria indicated in the Construction
Documents. Each component of the VIMS will be monitored by CQA personnel; no portion of the
VIMS may be covered unless documented by the CQA manager or the CQA field monitors to be
in compliance with the Construction Documents. The VIMS Design Engineer (defined in Section
3) must also approve, in writing, deviations from the Construction Documents.

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3. RESPONSIBLE PARTIES AND DEFINITIONS
This section provides descriptions, definitions, and responsibilities of the various companies and
individuals involved with construction of the VIMS.
3.1 Responsible Parties
The responsible parties for VIMS construction activities at this Site are:
Owner
Northwestern Housing Enterprises, Incorporated
P. O. Box 1673
Boone, NC 28607
Contact: E. G. “Ned” Fowler, President/CEO
Phone: [phone]

Project Manager
Northwestern Housing Enterprises, Incorporated
P. O. Box 1673
Boone, NC 28607
Contact: E. G. “Ned” Fowler, President/CEO
Phone: [phone]

Construction Manager:
ALH General Contractor, Inc.
4457 NC Hwy 105 S, G-2
Boone, NC 28607
Contact: Alan Herman
Phone: [phone]

Geosynthetics Installer
Bessco Inc
Contact: Jim Brunson
Phone: [phone]

Electrical VIMS installer
Whitson Electric
Contact: Gary Holcombe
Phone: [phone]

Other VIMS installers (piping, etc.)
Firm: TBD
Contact: TBD
Phone: TBD

GN9110 – Construction Quality Assurance Plan 5 June 2024

Vapor Intrusion Mitigation System Project Manager
Geosyntec Consultants of NC, P.C.
2501 Blue Ridge Road, Suite 430
Raleigh, North Carolina 27607
Contact: Morgan Randolph, E.I.T.
Phone: [phone]

Vapor Intrusion Mitigation System Design Engineer (Engineer)
Geosyntec Consultants of NC, P.C.
2501 Blue Ridge Road, Suite 430
Raleigh, North Carolina 27607
Contact: Mike Burcham, P.E. (NC, TX)
Phone: [phone]

3.2 Definitions and Responsibilities
Definitions and responsibilities of the various companies and individuals involved with
construction of the VIMS are described below.
Owner – Northwestern Housing Enterprises, Incorporated.
Project Manager (NHE) – The representative of the owner overseeing and having ultimate
responsibility for the project.
Construction Manager (ALH General Contractor, Inc.) – The person responsible for monitoring
the performance of the work by the Contractor and approval of Contractor submittals.

Contractor – The party responsible for the timely construction and installation of selected aspects
of the project as delineated on, and in accordance with the requirements outlined in, the Technical
Specifications and Construction Drawings.
Subcontractor(s) – The party responsible for installing components of the project as designated
by the Contractor and in accordance with the requirements outlined in the Technical Specifications
and Construction Drawings.
VIMS Design Engineer (“Engineer of Record [EOR]” or “Engineer”) (Geosyntec) – The firm
responsible for the design of the VIMS.
CQA Consultant (Geosyntec) – The VIMS CQA consultant, having responsibility for managing,
coordinating, and implementing the VIMS CQA activities and documenting that the Contractor’s
Construction Quality Control activities are performed in accordance with the Construction
Documents.

GN9110 – Construction Quality Assurance Plan 6 June 2024
CQA Manager – The individual representative of the CQA consultant, having overall
responsibility for managing, coordinating, and implementing the CQA activities and directing
CQA Field Monitors.
CQA Field Monitors – Representatives of the CQA Consultant, working under the direct
supervision of the CQA Manager, responsible for implementation of CQA activities.
Environmental Consultant (Geosyntec) – The firm responsible for overseeing the Site
redevelopment activities at the Site, as it relates to the BRS requirements.
Geosynthetics Installer (“Installer”) – Particular subcontractor responsible for installation of the
geosynthetic components of the VIMS (geomembrane vapor barrier and cushion geotextiles).

GN9110 – Construction Quality Assurance Plan 7 June 2024
4. CQA ORGANIZATION
4.1 General
The personnel listed below will jointly carry out the CQA responsibilities for VIMS construction.
The responsibility of each individual is described in each section.
4.2 Project Manager
The Project Manager works on behalf of the Owner and has ultimate authority on the project.
4.3 Construction Manager
The Construction Manager works for the Project Manager and serves as coordinator between the
Contractor, CQA Consultant, Engineer, and the Project Manager. The Construction Manager
reports concerns and issues to the Project Manager and acts as on-Site authority for all CQA-related
decisions.
4.4 Vapor Intrusion Mitigation System Design Engineer
The VIMS Design Engineer, as part of the VIMS Design team, prepares Construction Drawings
and Technical Specifications for the VIMS. Deviations or modifications from the Construction
Drawings or Technical Specifications must be approved by the Design Engineer.
4.5 CQA Consultant
The CQA Consultant is the firm having responsibility for managing, coordinating, implementing,
and documenting the VIMS CQA activities. Representatives of the VIMS CQA Consultant will
perform CQA of the VIMS. The CQA personnel include a CQA Manager and one or more CQA
Field Monitors.
4.6 CQA Manager
The CQA Manager will be a representative of the CQA Consultant. Responsibilities of the CQA
Manager include the following:
• Reviewing the Construction Drawings, the Technical Specifications, and addenda
• Reviewing other Construction Documents, including proposed material layouts
• Administrating the CQA program (i.e., assign and manage all CQA personnel, review field
reports and CQA logs, and provide engineering review of CQA related issues)
• Providing quality control of the CQA activities, including Site visits

GN9110 – Construction Quality Assurance Plan 8 June 2024
• Reviewing changes to the design, the Construction Drawings, and the Technical
Specifications
• Familiarizing CQA Field Monitors with the Site, project documents, and
project-specific-CQA requirements
• Managing the daily activities of the CQA Field Monitors
• Attending CQA related meetings (e.g., pre-construction, daily, weekly)
• Reviewing test results provided by contractors and making appropriate recommendations
to Construction Manager
• Assigning locations for testing and sampling
• Reviewing CQA Field Monitors’ daily reports and CQA logs
• Reporting to Project Manager and Construction Manager, as well as documenting in the
daily and weekly reports, relevant observations reported by the CQA Field Monitors
• Reporting unresolved deviations from the CQA Plan, the Construction Drawings, and the
Technical Specifications to the Project Manager and Construction Manager
• Reviewing submittals from the Contractor and making appropriate recommendations to the
Construction Manager
• Reviewing the qualifications of the Contractor for conformance with the Technical
Specifications and making appropriate recommendations to the Construction Manager
• Taking note of observed on-Site activities that could result in damage to components of the
project and reporting them to the Construction Manager and Contractor
• Performing duties of the CQA Field Monitors as needed
• Preparing the Final CQA Report(s)
4.7 CQA Field Monitors
The duties of the CQA Field Monitors, as assigned by the CQA Manager, include monitoring and
documenting construction of the VIMS before each component is covered. The duties of the CQA
Field Monitors include the following:
• Monitoring and testing (as required) geosynthetics prior to and during the installation

GN9110 – Construction Quality Assurance Plan 9 June 2024
• Monitoring polyvinyl chloride (PVC) pipe and vent strip components and installation
• Monitoring geomembrane vapor barrier installation
• Monitoring geotextile installation
• Monitoring ventilating aggregate installation
• Observing monitoring probe installation
• Documenting installation and testing of monitoring system components
• Documenting installation of passive wind driven turbines and/or active fans
• Recording CQA activities on field logs
• Preparing daily field reports
• Reporting to the CQA Manage
In addition to these specific duties, CQA Field Monitors will take note of on-Site activities that
could result in damage to components of the VIMS. Observations so noted by the CQA Field
Monitors will be reported to the CQA Manager. The CQA Manager will report observations to the
Construction Manager.

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5. MEETINGS
5.1 Pre-Construction Meeting
A pre-construction meeting will be held prior to commencing VIMS construction activities. At a
minimum, the meeting shall be attended by the Project Manager (or assigned representative), the
Construction Manager, the Contractor, relevant Subcontractors, the CQA Manager, and select
CQA Field Monitors.
Specific topics pertaining to the CQA of the VIMS to be considered for this meeting include the
following:
• The responsibilities and lines of authority of each party
• The status of submittals
• Establishment of work area security and safety protocols
• The methods to be used for documenting and reporting
• Changes in the Construction Drawings and Technical Specifications relating to the VIMS
(if any)
• Establishing protocols to be used for testing, deficiency identification, repairs, and retesting
• The proposed equipment and methodology for installation of VIMS components
• The VIMS construction schedule and its relationship to other aspects of the project
• Establishing material stockpile, storage, and processing locations
• A Site walk as deemed necessary by the Project Manager to review: (i) the limits of the
construction area and (iii) locations of storage areas
The pre-construction meeting will be documented in meeting minutes prepared by a person
designated by the Construction Manager at the beginning of the meeting. Within two working days
of the meeting, draft minutes will be transmitted to representatives of parties in attendance for
review and comment. Corrections and/or comments to the draft minutes shall be made within two
working days of receipt of the draft minutes to be incorporated in the final meeting minutes.
A weekly progress meeting, as needed, should be held between the CQA Manager, the Contractor,
Construction Manager, and other concerned parties participating in the construction of the project.
This meeting will include discussions on the current progress of the project, planned activities for
the next week, and revisions to the work plan and/or schedule.

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5.2 Daily Progress Meetings
Daily progress meetings will be convened at the discretion of either the Construction Manager
and/or the CQA Manager during VIMS construction activities. If held, the daily progress meetings
will be held prior to the start of a construction shift at the Site. At a minimum, the Construction
Manager, the Contractor, and the CQA Manager (or his/her representative) shall attend the
meeting.
Topics considered for this meeting include the following:
• New health and safety topics that are not addressed by the health and safety plan
• Proposed activities scheduled by the Contractor for the day
• Problems or deficiencies that have arisen during construction, if any
• Status of unresolved issues from previous daily meetings
• Results of test data
• Contractor’s deployment of personnel and equipment
• Previous day’s activities including the effectiveness of measures taken to alleviate
deficiencies
Topics discussed during daily progress meetings will be summarized by the CQA Manager in daily
field reports that will be provided to the Construction Manager and EOR.
5.3 Resolution Meeting
A resolution meeting will be held when and if a problem or deficiency is present or anticipated. At
a minimum, the Contractor, relevant Subcontractors, Project Manager, Construction Manager,
CQA Manager, and the appropriate CQA Field Monitor(s) shall attend the meeting. The purpose
of the meeting is to define and resolve the problem or work deficiency as follows:
• Define and discuss the problem or deficiency
• Review alternative solutions
• Implement an action plan to resolve the problem or deficiency
The resolution meeting will be documented in meeting minutes prepared by a person designated
by the Construction Manager at the beginning of the meeting. Within two working days of the
meeting, draft minutes will be transmitted to representatives of parties in attendance for review
and comment. Corrections to and/or comments on the draft minutes shall be made within two

GN9110 – Construction Quality Assurance Plan 12 June 2024
working days of receipt of the draft minutes to be incorporated in the final meeting minutes.
If the action plan to resolve the problem or deficiency requires a design change, the Construction
Manager will obtain approval of the design change by the EOR prior to the implementation of the
action plan.
5.4 Project Visits
The Engineer may periodically visit the construction Site. This visit should be coordinated by the
CQA Manager and the Construction Manager.

GN9110 – Construction Quality Assurance Plan 13 June 2024
6. COMPLIANCE WITH TECHNICAL SPECIFICATIONS
This section describes the CQA activities involved with the submittal process and installation of
the components of the VIMS in compliance with the technical specifications.
6.1 Technical Specification Sections
The VIMS Technical Specifications include the following sections:
• Section 13 3390 – Geotextile
• Section 13 3391 – Venting Aggregate
• Section 13 3392 – VIMS Piping
• Section 13 3393 – Geomembrane Vapor Barrier
• Section 13 3394 – Wind Driven Turbines, VIMS Fans, and Telemetry
6.2 Material Requirements
The materials used in VIMS construction must conform to the Technical Specifications. The CQA
Consultant will document that the materials used on Site are consistent with the products approved
by the Engineer. Non-compliance will be documented and reported to the Construction Manager.
6.3 Submittals
Prior to installing the VIMS, the Contractor will provide the CQA Consultant product sheets that
describe specified properties measured using test methods indicated in the Technical
Specifications, or equivalent of the geotextile, venting aggregate, VIMS piping, geomembrane
vapor barrier, and wind-driven turbines and fans. Non-compliance with the submittals will be
documented and reported to the Construction Manager.
In addition, the following submittals will be provided to the CQA Consultant by the Contractor
upon completion of the VIMS installation:
• Venting aggregate acceptance forms prior to the deployment of the geomembrane vapor
barrier
• Documentation of proper geomembrane vapor barrier deployment and successful
performance of smoke and/or coupon thickness (if applicable) testing as required by the
geomembrane vapor barrier manufacturer and Technical Specifications
• As-built drawings of the VIMS piping layout indicating piping layout changes, if any, as
approved in writing by the Engineer

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6.4 Handling and Placement
CQA personnel will monitor the handling and placement of materials used during VIMS
installation to be consistent with the requirements of the Technical Specifications. CQA personnel
will observe that geosynthetic materials are protected from ultraviolet light exposure, precipitation
or other inundation, mud, dirt, dust, puncture, cutting, and other damaging conditions. Non-
conformance and/or other deviations from the Technical Specifications will be documented and
reported to the Construction Manager.
The CQA Field Monitor will document that chemicals and chemical-containing products such as
fuel tanks are not stored on VIMS components at any time. If fuel products or other chemicals are
spilled on the VIMS components, the CQA Field Monitor will document the response.
6.5 Installation
The CQA Field Monitor will observe that the materials used in VIMS construction are installed as
indicated in the Technical Specifications, this includes, but is not limited to the following:
• Installing VIMS piping and vent strip, including subslab monitoring system components
• Surface preparation for the geotextile and geomembrane vapor barrier, including
documentation from the Installer that the venting aggregate on which the geomembrane
vapor barrier is deployed is acceptable
• Seaming and overlapping the geotextiles and geomembrane vapor barrier as indicated by
the manufacturer requirements and Technical Specifications
• Field testing, as performed by the Installer and in accordance with the Technical
Specifications, which requires smoke testing the geomembrane vapor barrier at a frequency
of at least once per 2,000 square feet or per mitigated footprint, whichever is smaller (and
geomembrane vapor barrier coupon thickness testing once per 2,000 square feet pending
the geomembrane vapor barrier manufacturer requirements selected by the Installer)
• Repair components used in VIMS installation as indicated in the Technical Specifications
Non-compliance will be documented and reported to the Construction Manager.
6.6 Installation of Overlying Materials
The CQA field monitor will observe the installation of materials overlying the VIMS and
document that it is installed in a manner that is in accordance with the Construction Documents
and that the underlying materials are not damaged. Non-compliance will be documented by the
CQA Field Monitor and reported to the Construction Manager.

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6.7 Electrical Requirements
The CQA Field Monitor will observe that the power supply to the powered fans is appropriate,
including number of phases, voltage, and full load current. The CQA Field Monitor will document
the power supply to the powered fan enclosures meet the requirements of the Technical
Specifications. Non-compliance with the Construction Documents will be documented and
reported to the Construction Manager.
6.8 Monitoring Systems
The CQA Field Monitor will document monitoring systems installation and their supporting
components, including extraction riser differential pressure sensors, are completed as indicated on
the Technical Specifications and Construction Drawings. Non-compliance will be documented and
reported to the Construction Manager.
6.9 Start-Up Testing
The CQA Field Monitor will observe start up testing as performed by the Contractor in accordance
with the Technical Specifications. Start-up testing is separate from VIMS diagnostic testing and
pre-occupancy testing, which are defined in the VIMS Design Report. Non-compliance with the
Construction Documents will be documented and reported to the Construction Manager.

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7. DOCUMENTATION
7.1 General
The effectiveness of a CQA Plan depends largely on: (i) recognizing construction activities that
should be monitored; and (ii) assigning responsibility for monitoring. This is effectively
accomplished by documenting quality assurance activities. The CQA Manager will document that
quality assurance requirements have been addressed and satisfied.
The CQA Manager will provide the Construction Manager with signed descriptive remarks, data
sheets, and logs to document that CQA monitoring activities have been carried out. The CQA
Manager will also maintain a file of the Construction Drawings, Technical Specifications, CQA
Plan, checklists, test procedures, daily logs, and other pertinent documents. CQA documentation
will be submitted to the Construction Manager following completion of the project.
7.2 Daily Record Keeping
7.2.1 General
Standard reporting procedures will include preparing CQA documentation (may be in digital form)
which, at a minimum, will consist of: (i) field notes, including memoranda of meetings and/or
discussions with the contractors, Construction Manager, or Project Manager; (ii) CQA monitoring
logs and testing data sheets; and (iii) construction problem and solution summary sheets. This
information will be regularly submitted to and reviewed by the CQA Manager.
7.2.2 Monitoring Logs and Testing Data Sheets
Monitoring logs and testing data sheets will be prepared for each inspection. At a minimum, logs
will include the following:
• Date, project name, location, and other identification
• Weather conditions
• Descriptions and locations of ongoing construction
• A summary of test results
• Delivery of VIMS-related materials
• Decisions made regarding acceptance of units of work and/or corrective actions to be taken
in instances of substandard testing results

GN9110 – Construction Quality Assurance Plan 17 June 2024
7.2.3 Construction Problems
The CQA personnel will notify the Construction Manager and the Engineer of significant
non-conformance from the Construction Drawings, the Technical Specifications, and/or the CQA
Plan. The CQA personnel, Construction Manager, and Engineer will evaluate the cause of the non-
conformance and identify appropriate changes to the procedures or the Construction Drawings and
Technical Specifications. The Construction Manager will submit changes to the Engineer for
review and approval. When this type of evaluation is made, the CQA personnel will document the
results, and the Engineer will approve revisions to the procedures, Construction Drawings, and/or
Technical Specifications.
Upon completion of construction, the Construction Manager will provide a summary of all
supporting data sheets, along with final testing results and the CQA Manager’s approval of the
work to the Engineer.
7.2.4 Spills
If solvent or fuel spills on or within the VIMS piping, trenches, or geosynthetic layers (e.g.,
geomembrane vapor barrier, geotextiles), the Contractor will be required to remediate the spill to
the satisfaction of the Environmental Consultant. Materials (e.g., subgrade, geotextile, venting
aggregate, pipe, geomembrane vapor barrier) impacted by a spill shall be removed from within the
footprint of the VIMS and disposed of in accordance with local regulations. Repairs to the VIMS
resulting from a spill response will be documented by the CQA personnel and included in the CQA
Report. Remedial actions overseen by the Environmental Consultant are not the responsibility of
the VIMS CQA Consultant; therefore, reporting related to potential remedial response actions will
not be presented in the CQA Report.
7.3 Photographic Reporting
CQA personnel will photograph work progress, problems, and mitigation activities. The Engineer
will maintain a project file containing the digital photos compiled by the CQA Manager and Field
Monitors.
7.4 Design, Technical Specifications, and/or Construction Drawing Changes
Design, Technical Specifications, and/or Construction Drawing changes may be required during
construction. In such cases, the CQA Manager will notify the Engineer.
Design, Technical Specifications, and/or Construction Drawing changes will be made only with
the written approval of the Engineer and will take the form of an amendment to the Technical
Specifications and/or the Construction Drawings. Documentation of design, Technical
Specifications, and/or Construction Drawing changes will be maintained by the VIMS CQA
Consultant and affected contractors.

GN9110 – Construction Quality Assurance Plan 18 June 2024
7.5 CQA Report
At project completion, the CQA Manager will submit a CQA Report to the Construction Manager.
This report will describe: (i) whether the work has been performed in compliance with the
Construction Drawings, the Technical Specifications, and approved changes; (ii) whether physical
sampling and testing has been conducted at the appropriate frequencies in accordance with the
CQA Plan; and (iii) whether the summary document provides the necessary supporting
information.
At a minimum, this report will include the following:
• Summaries of construction activities
• Monitoring logs and testing data sheets, including sample location plans
• Approved changes from the design, the Technical Specifications, and/or the Construction
Drawings
• As-built drawings to be prepared by the Contractor as outlined in the Technical
Specifications
• A summary statement, as applicable, indicating compliance with the Construction
Drawings, the Technical Specifications, and approved changes which is prepared by a
professional engineer licensed to practice in North Carolina

APPENDIX D

Typical Material Product Sheets

[phone] [e-mail] eproinc.com
System: Geo-Seal EV40s
Application: Underslab Contaminant Vapor Barrier System Thickness: 41 mils
1st Layer Seaming Materal
Product Name Geo-Seal EV40 Geo-Seal CORE
DESCRIPTION
Geo-Seal® EV40s is a significant improvement over existing
single sheet membranes. Geo-Seal EV40s consists of an EVOH
membrane combined with a robust geotextile layer to provide
a single sheet vapor intrusion barrier that is chemically-resistant
and easy to install, while also providing improved protection
during the installation process.
Geo-Seal® EV40s is ideal for lower risk sites where site
concentrations are lower than state-specific screening levels,
large flat and open areas where fast installation times are
required, or where active sub-slab ventilation systems are
utilized.
BENEFITS
• Spray Seams: Geo-Seal® CORE spray membrane to seal seams,
detail penetrations and terminate the membrane to concrete
surfaces
• Not Corrosive: Will not corrodelike metalized film membranes.
• EVOH: EVOH provides enhanced chemical vapor protection and
lower permeation rates than thicker HDPE membranes.
• Single-Source Warranty: EPRO can be a single point of contact to
address building vapor intrusion and waterproofing needs.
• Class A: Class A vapor barrier that alone will meet the basic
water vapor barrier requirements for new construction.
LIMITATIONS
• Do not apply below 20°F or to damp, frozen or contaminated
surfaces.
• Contact EPRO for waterproofing system recommendations.
Vapor Intrusion Mitigation Technology - Geo-Seal EV40s
Geo-Seal CORE(spray applied polymer modified asphaltic membrane)
Geo-Seal EV40(EVOH/Geotextile)
Vapor-Vent System
EV40s
[phone] [e-mail] eproinc.com
Vapor Intrusion Mitigation Technology - Geo-Seal EV40s
SPECIFICATIONS, DRAWINGS, AND TECHNICAL
ASSISTANCE
The most current specifications and drawings can be found on
www.eproinc.com. For project specific details contact EPRO directly,
or your local EPRO representative.
Site conditions, performance goals, and budget determine which system
is most appropriate for a given project. For more information regarding
product performance, testing, plan review, or general technical
assistance, please contact EPRO.
WARRANTY
EPRO provides a wide range of warranty options for Geo-Seal systems.
For a project to be eligible for any warranty option beyond a 1-year
material warranty, a Geo-Seal Authorized Applicator must be used
and the project must be registered and approved by EPRO prior to
the commencement of any product application.
Warranty options available for this system include:
• Material warranty
• Longer warranty periods are available. Contact EPRO for more
information.
Physical Property Test Method Value
Film Material .....................................................................................................................................Polyethylene & EVOH
Film Color ..........................................................................................................................................White/Blue
Weight................................................................................................................................................618 g/m²
Film Thickness ...................................................................................................................................41 Mil
Classification .......................................................ASTM E1745 ........................................................Class A, B & C
Water Vapor Permeance ...................................ASTM E96 ............................................................0.0098 perms
Tensile Strength ..................................................ASTM D882 ..........................................................71 lbf
Elongation ...........................................................ASTM D882 ..........................................................735%
Puncture Resistance ...........................................ASTM D1709 ........................................................2600 grams
Life Expectancy ...................................................ASTM E154 ..........................................................Infinite
Low Temp. Impact ..............................................ASTM D1790 ........................................................Resistant to 105° C
Methane Gas Permeance .................................ASTM D1434 ........................................................3.68 x 10-12 m/s
Benzene Gas Permeance ..................................Queens University1 .............................................1.13 x 10-10 m2/sec
TCE Gas Permeance ..........................................Queens University1 .............................................7.66 x 10-11 m2/sec
PCE Gas Permeance ..........................................Queens University1 .............................................7.22 x 10-11 m2/sec
Ethylbenzene Permeance ..................................Queens University1 .............................................1.23 x 10-10 m2/sec
Toluene Permeance............................................Queens University1 .............................................1.57 x 10-10 m2/sec
Radon Diffusion Coeffiecent .............................K124/02/95 ..........................................................7.22 x 10-11 m2/sec
1 Queens University testing results are not directly comparable to other permeation/diffusion testing methods.
Geo-Seal® EV40
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Product Description
Basic Use: Geo-Seal EV40 is a standalone geocomposite EVOH
passive barrier system used to mitigate vapor intrusion for
sites deemed to be low risk. Geo-Seal EV40 may also be used
in conjunction with an active sub-slab mitigation to increase
system efficiency and provide an additional layer of redundancy.
Geo-Seal CORE, , a specially formulated asphalt emulsion, is
applied within the Geo-Seal EV40 seam overlap, around pipe
penetrations, and at termination, points to eliminate the need
for costly tape. Combining a sheet membrane with spray-
applied detailing helps increase installation efficiency while also
ensuring a robust seal in critical areas.
Composition: Geo-Seal EV40 is a 41-mil composite EVOH
geomembrane with a 3 oz. geotextile bonded to one side to
increase tensile and puncture strength. Geo-Seal EV40 also
exceeds all Class A, B, and C vapor barrier requirements.
Benefits
• EVOH geocomposite sheet membrane provides increased
thickness and robustness over similarly priced sheet
membranes.
• Geotextile backing enhances tensile strength and puncture
resistance, while also increasing seam strength and
durability.
• Geo-Seal EV40 can easily be smoke tested to ensure proper
installation and quality control measures.
• Meets class A, B, and C vapor barrier standards.
Limitations
• A more robust composite system should be utilized for sites
with elevated risk or more complex applications as thinner
mil vapor intrusion barriers are less durable and and less
puncture resistant than thicker composite systems offered by
EPRO.
• Additional geotextile may be required to cushion the Geo-
Seal EV40s system from additional aggregate layers.
Technical Data
Properties: See physical properties table
Coverages: One roll covers 1200 square feet, not including
overlaps or waste
Specification Writer: Contact EPRO before writing specifications
on this product
Installation
Preparation: Please refer to manufacturer’s specifications for
substrate requirements. Rolls should be inspected for damage
prior to application.
Application: Please refer to manufacturer’s specifications.
Overlap the seams of Geo-Seal EV40 a minimum of 6” and with
a 60 mil application of Geo-Seal CORE in the seam overlap.
Availability and Packaging
Contact a local EPRO installer or authorized applicator
(www.eproinc.com).
Roll Size: 12’ x 100’ unfolded rolls, 165 lbs.
Warranty
Limited Warranty: EPRO Services, Inc. believes to the best of its
knowledge that performance tables are accurate and reliable.
EPRO warrants this product to be free from defects. EPRO
makes no other warranties with respect to this product, express
or implied, including without limitation the implied warranties
of MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.
EPRO’s liability shall be limited in all events to supplying
sufficient product to repair the specific areas to which defective
product has been applied. EPRO shall have no other liability,
including liability for incidental or resultant damages, whether
due to breach of warranty or negligence. This warranty may
not be modified or extended by representatives of EPRO or its
distributors.
Equipment
Seaming: AD-55 Sprayer, available through EPRO for application
of Geo-Seal CORE in seam overlaps.
Smoke Testing: EPRO Smoke Test Machine for underslab
applications
Technical Services and Information
Complete technical services and information are available by
contacting EPRO at 800.882.1896 or www.eproinc.com.
Geo-Seal® EV40
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Physical Property Test Method Value
Film Material .....................................................................................................................................Polyethylene & EVOH
Film Color ..........................................................................................................................................White/Blue
Weight................................................................................................................................................618 g/m²
Film Thickness ...................................................................................................................................41 Mil
Water Vapor Permeance ...................................ASTM E96 ............................................................0.0098 perms
Tensile Strength ..................................................ASTM D882 ..........................................................61 lbf
Elongation ...........................................................ASTM D882 ..........................................................730%
Puncture Resistance ...........................................ASTM D1709 ........................................................2600 grams
Life Expectancy ...................................................ASTM E154 ..........................................................Infinite
Low Temp. Impact ..............................................ASTM D1790 ........................................................Resistant to 105° C
Methane Gas Permeance .................................ASTM D1434 ........................................................3.68 x 10-12 m/s
Benzene Gas Permeance ..................................Queens University ..............................................1.13 x 10-10 m2/sec
TCE Gas Permeance ..........................................Queens University ..............................................7.66 x 10-11 m2/sec
PCE Gas Permeance ..........................................Queens University ..............................................7.22 x 10-11 m2/sec
Classification .......................................................ASTM E1745 ........................................................Class A, B & C
Dimensions: 12’ x 100’
Weight: 165 lbs.
Typical Physical Properties
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Geo-Seal® CORE
Product Description
Basic Use: Geo-Seal CORE is a polymer modified asphalt (PMA)
applied to nominal dry thicknesses depending on the configuration
of the Geo-Seal system vapor intrusion barrier system. Spray
applied to form a seamless barrier, Geo-Seal CORE is an integral
component to all Geo-Seal systems due to its ability to bond to
and seam high density polyethylene (HDPE), polyolefin sheets.
Geo-Seal CORE is applied with a proprietary self-contained
sprayer designed to produce a high build, monolithic, and
rapidly curing membrane.
Composition: Geo-Seal CORE is a non-hazardous, low-viscosity,
water-based, anionic asphalt emulsion modified with a blend of
synthetic polymerized rubbers and proprietary additives. Geo-Seal
CORE is highly stable during transit and proper storage, but
becomes highly reactive during the spray application to form a
rapidly cured membrane with exceptional bonding, elongation,
and hydrophobic characteristics.
Benefits
• Provides a layer of seamless protection and redundancy in
all Geo-Seal system assemblies
• Hydrophobic and resistant to methane gas
• Non-toxic, non-hazardous, non-flammable, and VOC free
• Forms a tenacious bond to HDPE sheets
• Application to damp substrates is acceptable
• Can be applied in below freezing temperatures with proper
equipment
Limitations
• Surfaces shall be free of dirt and debris
• Material should be stored above 40°F and not allowed
to freeze
• Not a traffic bearing surface, additional protection required
• Must not be applied to ponded water
• Direct foot traffic should be limited when ambient air
temperatures are greater than 100°F
Technical Data
Shelf life: 6 months. The ability to apply the product beyond
its estimated shelf life is dependent on storage conditions and
homogeneity of the product. Storing material in an enclosed
temperature controlled environment that maintains a minimum
ambient temperature of 65° Fahrenheit will likely extend the
shelf life beyond 6 months.
Properties: See physical properties table
Specification Writer: Contact EPRO before writing specifications
on this product. Geo-Seal system assemblies should be reviewed
in order to meet project specific site conditions.
Additional test information available upon request.
Installation
EPRO Authorized Applicators must be approved in writing by
EPRO prior to receiving a contract in order to qualify for a
warranty for this product and system assembly.
Surface Preparation: All surfaces shall be prepared in
accordance to manufacturer’s specifications. Surfaces shall be
uniform, free of loose materials, and surface contaminants.
Contaminant and loose debris shall be removed prior to
application by suitable methods.
Application: Please refer to manufacturer’s specifications.
Geo-Seal CORE shall be spray applied to the specified nominal
mil thickness. When properly applied, Geo-Seal CORE will set
up immediately on the surface and promptly start the curing
process. Light foot traffic is acceptable, but must be limited to
the authorized Geo-Seal applicator. The initial cure is complete
when Geo-Seal CORE is no longer ejecting moisture, 12 to 48
hours depending on ambient air conditions.
Availability and Packaging
Contact EPRO sales representative for local distributors or
authorized applicators (www.eproinc.com).
Geo-Seal CORE is available in the following packaging options:
55 gallon drum
275 gallon tote
330 gallon tote
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Geo-Seal® CORE
Physical Property Test Method Results
Tensile Strength - Core only .............................ASTM 412 ...........................................................32 psi
Tensile Strength - Geo-Seal System ................ASTM 412 ...........................................................662 psi
Elongation ..........................................................ASTM 412 ...........................................................4140%
Resistance to Decay .........................................ASTM E 154 Section 13 .....................................4% Perm Loss
Accelerated Aging ............................................ASTM G 23 .........................................................No Effect
Moisture Vapor Transmission ...........................ASTM E 96 ...........................................................026 g/ft2/hr
Hydrostatic Water Pressure .............................ASTM D 751 .......................................................26 psi
Perm rating ........................................................ASTM E 96 (US Perms) ......................................0.21
Methane transmission rate ..............................ASTM D 1434 .....................................................Passed
Adhesion to Concrete & Masonry ...................ASTM C 836 & ASTM C 704 .............................11 lbf./inch
Hardness ............................................................ASTM C 836 .......................................................80
Crack Bridging ...................................................ASTM C 836 .......................................................No Cracking
Heat Aging ........................................................ASTM D 4068 .....................................................Passed
Environmental Stress Cracking ........................ASTM D 1693 .....................................................Passed
Oil Resistance ....................................................ASTM D543 .........................................................Passed
Soil Burial ...........................................................ASTM D 4068 .....................................................Passed
Low Temp. Flexibility .........................................ASTM C 836-00 ..................................................No Cracking at –20°C
Resistance to Acids
Acetic ................................................................................................................................................30%
Sulfuric and Hydrochloric ...............................................................................................................13%
Temperature Effect
Stable ...............................................................................................................................................248°F
Flexible .............................................................................................................................................13°F
Typical Physical Properties
Warranty
Limited Warranty: EPRO Services, Inc. believes to the best of its
knowledge that performance tables are accurate and reliable.
EPRO warrants this product to be free from defects. EPRO
makes no other warranties with respect to this product, express
or implied, including without limitation the implied warranties
of MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.
EPRO’s liability shall be limited in all events to supplying
sufficient product to retreat the specific areas to which defective
product has been applied. EPRO shall have no other liability,
including liability for incidental or resultant damages, whether
due to breach of warranty or negligence. This warranty may
not be modified or extended by representatives of EPRO or its
distributors.
Equipment
Spray System: AD-55 Sprayer is available through EPRO. To
discuss alternative spray machine options, please contact
EPRO directly.
Smoke Testing: EPRO Smoke Test Machine for underslab
applications
Technical Services and Information
Complete technical services and information are available by
contacting EPRO at 800.882.1896 or www.eproinc.com.
e.roll
Product Data Sheet
EPRO Services Inc. [phone] eproinc.com
Product Description
Basic Use: e.roll is a key component to EPRO’s redundant field
installed composite design concept and is a roller applied
version of e.spray. It is designed to be used for system detailing,
repairs, and in areas where the required clearance for e.spray
cannot be achieved. e.roll is most commonly used in conjunction
with e.poly to reinforce system penetrations, terminations, seams,
cracks, and membrane transitions. e.roll is used on decks, over-
excavated walls, blindside vertical walls, and underslab E.Series
assemblies. e.roll can be applied to a wide range of materials/
substrates, high density polyethylene (HDPE), polyolefin sheets,
geotextile fabric, wood, metal, foam insulation, and concrete
based surfaces (green concrete, shotcrete and concrete masonry
units (CMU)).
Composition: e-roll is a medium viscosity water-based, polymer-
modified anionic asphalt emulsion, which exhibits exceptional
bonding, elongation and waterproofing characteristics.
Benefits
• e.roll is a single component material, no additional
blending is required
• Provides the ability to easily detail and repair assemblies
without the use of a spray pump
• Non-toxic, non-hazardous, non-flammable, and VOC free
• Forms both a mechanical and ionic bond directly to
concrete
• Application to damp substrates is acceptable
Limitations
• Surfaces shall be free of dirt and debris
• Material should be stored above 40°F and not allowed to
freeze
• Not a traffic bearing surface, additional protection required
• Must not be applied to ponded water
• Cold temperatures will prolong cure time
Technical Data
Shelf life: 1 year. The ability to apply the product beyond its
estimated shelf life is dependent on storage conditions and
homogeneity of the product. Storing material in an enclosed
temperature controlled environment that maintains a minimum
ambient temperature of 65° Fahrenheit will likely extend the
shelf life beyond 1 year.
Properties: See physical properties table
Specification Writer: Contact EPRO before writing specifications
on this product. E.Series system assemblies should be reviewed
in order to meet project specific site conditions.
Installation
Surface Preparation: All surfaces shall be prepared in
accordance to manufacturer’s specifications. In general, this
means all surfaces shall be uniform, free of loose materials, and
surface contaminants. Contaminant and loose debris shall be
removed prior to application by suitable methods. A test should
always be done prior to application using the same cleaning
preparation and application procedures to be used on the
project.
Application: Please refer to manufacturer’s specifications. e.roll
shall be spray applied to the specified nominal mil thickness.
e.roll may be applied by roller or brush.
Cleaning: Clean all tools, hoses, spray guns, and tips with
kerosene and/or equivalent.
Availability and Packaging
Contact EPRO sales representative for local distributors or
authorized applicators (www.eproinc.com).
e.roll is available in 5 gallon or 1 gallon containers.
Warranty
Limited Warranty: EPRO Services, Inc. believes to the best of its
knowledge that performance tables are accurate and reliable.
EPRO warrants this product to be free from defects. EPRO
makes no other warranties with respect to this product, express
or implied, including without limitation the implied warranties
of MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.
EPRO’s liability shall be limited in all events to supplying
sufficient product to retreat the specific areas to which defective
product has been applied. EPRO shall have no other liability,
including liability for incidental or resultant damages, whether
due to breach of warranty or negligence. This warranty may
not be modified or extended by representatives of EPRO or its
distributors.
e.roll
Product Data Sheet
EPRO Services Inc. [phone] eproinc.com
Physical Property Test Method Value
Color ..................................................................................................................................................Brown to Black
Solvent Content.................................................................................................................................No Solvents
Shelf Life ............................................................................................................................................6 months
Tensile Strength ..................................................ASTM D412 ..........................................................32 psi
Elongation ...........................................................ASTM D412 ..........................................................3860%
Resistance to Decay ...........................................ASTM E154 SECTION 13 .....................................9% Perm Loss
Accelerated Aging .............................................ASTM G23 ...........................................................No Effect
Moisture Vapor Transmission ............................ASTM E96 ............................................................0.071 g/ft²/hr
Hydrostatic Water Pressure ...............................ASTM D751 ..........................................................28 psi
Perm Rating.........................................................ASTM E96 ............................................................0.17 perms
Methane Transmission Rate ..............................ASTM D14334 ......................................................0
Adhesion to Concrete & Masonry ....................ASTM C836 ..........................................................1 lbf/inch
Hardness .............................................................ASTM C836 ..........................................................85
Crack Bridging ....................................................ASTM C836 ..........................................................No Cracking
Low Temp. Flexibility ..........................................ASTM C836-00 .....................................................No Cracking at -20°C
Packaging: 5 gallon bucket
Typical Physical Properties
Equipment
No special equipment is necessary.
Technical Services and Information
Complete technical services and information are available by
contacting EPRO at 800.882.1896 or www.eproinc.com.
This product was formally known as Ecoline-R.
e.poly
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Product Description
Basic Use: e.poly is a polyester fabric that is designed to
reinforce membrane terminations, transitions, penetrations,
seams, and general repair areas. Used in every E.Series
assembly, e.poly is installed between two layers of e.roll or
e.spray.
Composition: e.poly is a 100% polyester textile material
composed of staple fibers hydraulically entangled.
Benefits
• Excellent conformability and elongation
• Exceptional tear resistance and high tensile strength
• Open weave allows complete saturation and integration
Limitations
• Not suitable for expansion joints or areas where movement
is desired
Technical Data
Properties: See physical properties table
Coverages: 6”, 12” and 40” rolls cover 150, 300, and 1,080
square feet, respectively
Specification Writer: Contact EPRO before writing specifications
on this product. E.Series system assemblies should be reviewed
in order to meet project specific site conditions.
Installation
Preparation: Please refer to manufacturer’s specifications for
substrate requirements. Application of e.poly should be done
when weather conditions meet the requirement of e.roll or
e.spray.
Installation: Please refer to manufacturer’s specifications.
Install specified thickness of e.roll or e.spray and immediately
embed e.poly into the initial layer of e.roll or e.spray. Once
firmly pressed into the uncured membrane, fully saturate with
additional layer of e.roll or e.spray to the specified thickness.
Availability and Packaging
Contact EPRO sales representative for local distributors or
authorized applicators (www.eproinc.com).
Roll: 6” x 300’, 12” x 300’, and 40” x 324’ rolls are available
Warranty
Limited Warranty: EPRO Services, Inc. believes to the best of its
knowledge that performance tables are accurate and reliable.
EPRO warrants this product to be free from defects. EPRO
makes no other warranties with respect to this product, express
or implied, including without limitation the implied warranties
of MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.
EPRO’s liability shall be limited in all events to supplying
sufficient product to retreat the specific areas to which defective
product has been applied. EPRO shall have no other liability,
including liability for incidental or resultant damages, whether
due to breach of warranty or negligence. This warranty may
not be modified or extended by representatives of EPRO or its
distributors.
Equipment
No special equipment is needed.
Technical Services and Information
Complete technical services and information are available by
contacting EPRO at 800.882.1896 or www.eproinc.com.
This product was formally known as Polyester.
e.poly
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Physical Property Test Method Value
Weight................................................................................................................................................3 oz.
Bursting Strength ...............................................ASTM D3786 ........................................................177 lbs.
Tensile Strength .................................................ASTM D1682 ........................................................57.1 psi
Tear Strength .......................................................ASTM D1117 ........................................................16.1 lbs
Elongation ..........................................................ASTM D1682 ........................................................62.0%
Conformability ..................................................................................................................................Excellent
Ease of saturation ............................................................................................................................Excellent
Dimensions: 6” x 300’, 12” x 300’, and 40” x 324’ rolls are available
Typical Physical Properties
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Vapor-Vent
Product Description
Basic Use: Vapor-Vent vapor collection system is a composite
low profile pressure relief and collection system designed to
mitigate the build up of methane gas and contaminated vapor
under an overlying structure. Vapor-Vent is most commonly
designed to operate passively, but may also be designed as
an active system when conditions require.
Composition: Vapor-Vent features a lightweight, three-
dimensional, highly flexible polypropylene core and a non-
woven geotextile filter fabric. The filter fabric is bonded to the
polypropylene core to prevent fine substrates, such as sand,
from clogging the vent pipe.
Benefits
• Cost effective alternative to traditional trenched PVC or ADS
pipe systems
• Placed directly below the barrier system to drastically
reduce vapor accumulation under the structure
• Can operate as a passive system with the ablity to activate
in the future
Limitations
• Not effective when constantly submerged
• Should be placed within permeable substrates
Technical Data
Properties: See physical properties table
Coverages: One roll covers 165 lineal feet. Radius of influence is
25', maximum spacing between Vapor-Vent runs is 50'. Vent riser
locations should be identified by an environmental engineer
prior to installation.
Specification Writer: Contact EPRO before writing specifications
on this product. Geo-Seal system assemblies should be reviewed
in order to meet project specific site conditions.
Installation
Preparation: Please refer to manufacturer’s specifications for
substrate requirements. Rolls should be inspected for cosmetic
damage prior to application. Substrate must be compacted
and inspected prior to installation, to make certain it is in
accordance with manufacturer’s requirements.
Application: Please refer to manufacturer’s specifications.
Installation of Vapor-Vent shall occur after the preparation of
substrate and prior to the placement of the barrier system.
Vapor-Vent end outs shall be used in transition to vertical
vent risers as required.
Availability and Packaging
Contact EPRO sales representative for local distributors or
authorized applicators (www.eproinc.com).
Roll: 165’ x 12” x 1”, 65 lbs.
Warranty
Limited Warranty: EPRO Services, Inc. believes to the best of its
knowledge that performance tables are accurate and reliable.
EPRO warrants this product to be free from defects. EPRO
makes no other warranties with respect to this product, express
or implied, including without limitation the implied warranties
of MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.
EPRO’s liability shall be limited in all events to supplying
sufficient product to retreat the specific areas to which defective
product has been applied. EPRO shall have no other liability,
including liability for incidental or resultant damages, whether
due to breach of warranty or negligence. This warranty may
not be modified or extended by representatives of EPRO or its
distributors.
Equipment
No special equipment is required.
Technical Services and Information
Complete technical services and information are available by
contacting EPRO at 800.882.1896 or www.eproinc.com.
Product Data Sheet
EPRO Services, Inc. [phone] eproinc.com
Vapor-Vent
Physical Property Test Method Vapor-Vent Poly Value
Material .............................................................................................................Polystyrene.......................................HDPE
Comprehensive Strength ..................................ASTM D 1621 ......................9,000 lbs/ft2 ....................................11,400 lbs/ft2
In-plane flow (Hydraulic gradient-0.1) ............ASTM D 4716 ......................30 gpm/ft of width .........................30 gpm/ft of width
Chemical Resistance ........................................................................................N/A ..................................................Excellent
FABRIC PROPERTIES
Grab Tensile Strength .......................................ASTM D 4632 ......................100 lbs ............................................110 lbs
Puncture Strength ..............................................ASTM D 4833 ......................65 lbs ..............................................30 lbs
Mullen Burst Strength ........................................ASTM D 3786........................N/A ..................................................90 PSI
AOS .....................................................................ASTM D 4751 ......................70 U.S. Sieve ...................................50 U.S. Sieve
Flow Rate ...........................................................ASTM D 4491 ......................140 gpm/ft2 .....................................95 gpm/ft2
UV Stability (500 hours) ....................................ASTM D 4355 ......................N/A ..................................................70% Retained
DIMENSIONAL DATA
Thickness ...........................................................................................................1 inch ...............................................1 inch
Standard Widths ...............................................................................................12 inches .........................................12 inches
Roll Length ........................................................................................................165 ft ...............................................165 ft
Roll Weight ........................................................................................................65 lbs ..............................................68 lbs
Typical Physical Properties
TECHNICAL DATATECHNICAL DATA
FORM: TDS_ULTRASHIELD_G-1000_AM_EN_201705_V2
North America: 847.851.1800 | 800.527.9948 | www.cetco.com
© 2017 Minerals Technologies Inc. IMPORTANT: The information contained herein supersedes all previous printed versions, and is believed to be accurate and
reliable. For the most up-to-date information, please visit www.cetco.com. CETCO accepts no responsibility for the results obtained through application of this
product. All products are sold on the understanding that the user is solely responsible for determining their suitability for the intended use and for proper use and
disposal of the product. CETCO MAKES NO WARRANTY OF MERCHANTABILITY OR SUITABILITY FOR ANY PARTICULAR PURPOSE IN CONNECTION WITH ANY SALE
OF THE PRODUCTS DESCRIBED HEREIN. CETCO reserves the right to update information without notice.
DESCRIPTION
ULTRASHIELD™ G-1000 is a polypropylene,
staple iber, non-woven geotextile. The ibers
are needled-punched, forming a stable net-
work that retains dimensional stability rela-
tive to each other. The geotextile is resistant
to ultraviolet degradation and biological and
chemical environments found in soils. Manu-
facturing Quality Control tests have been
performed and are accredited by the Geosyn-
thetic Accreditation Institute’s Laboratory Ac-
creditation Program (GAI-LAP).
APPLICATION
ULTRASHIELD™ G-1000 is designed for use as
a underslab adhesion protection course spe-
cially designed and required for underslab LIQ-
UID BOOT® applications where the membrane
must remain attached to the underslab of the
building. This is to ensure the membrane re-
mains in place despite soil settlement, which
is common when building is on a landill.
BENEFITS
ULTRASHIELD™ G-1000 is installed directly
over the inished LIQUID BOOT® vapor intru-
sion barrier, providing superior protection from
other trades.
PACKAGING
• 15 ft. x 180 ft. (4.5 m x 55 m) Rolls
ULTRASHIELD™ G-1000
NON-WOVEN GEOTEXTILE FABRIC
ULTRASHIELD™ G-1000 is a needle-punched, non-woven geotextile with superior tensile strength and puncture resistance.
UPDATED: MAY 2017
PHYSICAL PROPERTIES
PROPERTY TEST METHOD RESULT (ENGLISH) RESULT (METRIC)
Tensile Bond Strength to Concrete³ ASTM C 297-94 7 psi
Mass/Unit Area ASTM D 5261 10.0 oz/yd²339 g/m²
Thickness ASTM D 5199 105 mils 2.7 mm
Tensile Strength ASTM D 4632 270 lbs.1202 N
Elongation ASTM D 4632 50% 50%
CBR Puncture Strength ASTM D6241 725 lbs.3226 N
Trapezoid Tear ASTM D 4533 105 lbs. 467 N
UV Resistance ASTM D 4355 70% 70%
A.O.S.ASTM D 4751 100 U.S. Sieve 0.150 mm
Permittivity ASTM D 4491 1.2 sec–1 1.2 sec–1
Permeability ASTM D 4491 0.30 cm/sec 0.30 cm/sec
Water Flow Rate ASTM D 4491 85 gal/min//ft²3463 l/min/m²
TESTING DATA
NOTES:
1. The property values listed above are effective 04/2011 and are subject to change without notice.
2. All values shown are in weaker principal direction and are Minimum average roll values (MARV), except for AOS, which is a Maximum average roll value.
3. Historical value, based on past testing.
Product Name
(MARV) listed below:
1. The property values listed above are subject to change without notice.
2.
3. Maximum Average Roll Value (MaxARV)
4. At time of manufacturing. Handling may change these properties.
Minimum Average Roll Values (MARV) is calculated as the average minus two standard deviations.
Statistically, it yields approximately 97.5% degree of confidence that any samples taken from quality
assurance testing will meet or exceed the values described above.
This information is provided for reference purposes only and is not intended as a warranty or guarantee. SKAPS
assumes no liability in connection with the use of this information.
Property Method English (MARV2) Metric (MARV2)
SKAPS GE‐160 is a needle‐punched nonwoven geotextile made of
100% virgin polypropylene staple fibers, which are formed into a random
network for dimensional stability. SKAPS GE‐160 resists ultraviolet
deterioration, rotting, biological degradation, naturally encountered
alkalis and acids. Polypropylene is stable within the pH range of 2 to 13.
SKAPS GE‐160 conforms to the Minimum Average Roll Values
Weight ASTM D 5261 6 oz/yd2 203 g/m2
Grab Tensile Strength ASTM D 4632 160 lbs 0.711 kN
Grab Elongation ASTM D 4632 50% 50%
Trapezoid Tear Strength ASTM D 4533 65 lbs 0.29 kN
Thickness4 ASTM D‐5199 85 mils 2.16 mm
CBR Puncture Resistance ASTM D 6241 450 lbs 2 kN
Permittivity4 ASTM D 4491 1.63 sec-1 1.63 sec-1
Permeability4 ASTM D 4491 0.48 cm/sec 0.48 cm/sec
Roll Dimensions (W x L) 15 x 900 ft. 4.58 m x 274.32 m
Water Flow4 ASTM D 4491 125 gpm/ft2 5080 l/min/m2
Apparent Opening Size (AOS)3&4 ASTM D 4751 70 US Sieve 0.212 mm
UV Resistance ASTM D 4355 70%/500 hrs. 70%/500 hrs.
Packaging
Note
Area Per Roll 1500 sq. yards 1256 sq. meters
NON-WOVEN GEOTEXTILE
GE - 160
RP
Radon Mitigation Fan
All RadonAway® fans are specifically designed for radon
mitigation. RP Series Fans provide superb performance, run
ultra-quiet and are attractive. They are ideal for most sub-slab
radon mitigation systems.
Features
• Eternalast™polycarbonate plastic housing
• Energy efficient
• Ultra-quiet operation
• Meets all electrical code requirements
• Water-hardened motorized impeller
• Seams sealed to inhibit radon leakage
(RP140 & RP145 double snap sealed)
• ETL Listed - for indoor or outdoor use
• Thermally protected motor
• Rated for commercial and residential use
• HVI certified fan performance
For Further Information, Contact Your Radon Professional:
Rev G 0322
P/N 02047© 2022 RadonAway
Installs white, stays white
A
C
B
All RadonAway® inline radon fans are covered
by our 5-year, hassle-free warranty.
MODEL P/N FAN DUCTDIAMETER WATTS
RECOM. MAX.
OP. PRESSURE “WC
TYPICAL CFM vs. STATIC PRESSURE WC
0”.2”.5”1.0”1.5”2.0”
RP140†28460 4”14-19 0.6 152 120*64*---
RP145 28461 4”34-66 1.7 169 150*124*81*42 4
RP260 28462 6”47-65 1.3 251 210*157 70 --
RP265 28463 6”96-136 2.3 375 340*282*204*140 70
RP380 28464 8”96-138 2.0 531 490*415*268*139 41
ETL Listed
RP140 Only
Model A B C
RP140 4.5”9.7”8.5”
RP145 4.5”9.7”8.5”
RP260 6”11.75”8.6”
RP265 6”11.75”8.6”
RP380 8”13.41”10.53”
*HVI Certified Values. †Energy Star® Rated.
Specifications
Medium: Non-combustible, non-corrosive air, insensitive to
moisture, dust, condensation and oil
Working Temp.: 20~70°C
Medium Temp.: 0~60°C
Temp. Compensation: 0~50°C
Working Pressure: overload 10xFS, burst 15xFS
Display: 5 bits LCD, with engineering unit & backlight
Output: 0-10V / 4-20mA (3 wires)
Output load: ≤500Ω (current), ≥2KΩ (voltage)
Relay Output: 2×SPST, 3A/30VDC, 3A/250VAC or 1xBuzzer
Accuracy: up to ±1.0%FS(±2.0%FS@25Pa range)
Long term stability: ±0.5%FS /Year
Thermal effect: <0.05%FS/°C (zero), <0.08%FS/°C(FS)
Power type 16~28VDC/AC
24V Power Supply included
Process Connection: 5mm ID tubing, two pairs (left/back)
Keys: 3 touch buttons
Protection: IP54
Approval: CE
Display update time: selectable for 0.5/1/5/10s (default 1s)
Pricing: $125 per unit
Add $30 for 4-20 mA / 0-10V version
Custom options and bulk order
pricing available. Call or email for
details.
Applications and Features
Scale 0-40 inches WC eliminates need for multiplegauges.
Visual and audible alarm included and factory set at 1"WC
Fully programmable for Display, Alarm, Delay, and Units.
Options
Second adjustable relay for triggering additional alarms.Optional 4-20 MA or 0-10 output for data.
Wireless 0-10 VDC Voltage Meters
General Description
The Wireless Voltage Meter measures the voltage
between two electrical points. It can be connected to
the power and ground of any voltage source and
measure within stated accuracy up to 10 VDC. It can be
connected to any kind of variable voltage device, such
as a transducer or sensor that outputs voltage. If the
device to be measured is passive, the user must supply
their own excitation voltage to the device.
-Accurate to +/-(2.0% of Reading + .002 V)
-Accurate to +/-(0.5% of Reading + .002 V) with user
calibration
-Interfaces with any variable-voltage device
-1 mV resolution
Principle of Operation
Wireless Voltage Meters read the voltage difference
between two electrical points and reports back the
measured voltage. It is programmed to sleep for a
user-given time interval (heartbeat) and then wake up,
convert the analog data, mathematically compute the
voltage, and transmit the data to the gateway, where it
is then logged into a cloud service. The user can
configure defined thresholds and have the system alert
on threshold breaches.
Example Applications
-Battery Health
-Voltage Measurement
-Transducer Measurement
-Machinery
-Electrical Motors
-Additional applications
PAGE 1
Features of Wireless Sensors
-Wireless range of 1,200+ feet through 12+ walls *
-Frequency-Hopping Spread Spectrum (FHSS)
-Best in class interference immunity
-Best in class power management for longer battery
life **
-Encrypt-RF® Security (Diffie-Hellman Key Exchange
+ AES-128 CBC for sensor data messages)
-Onboard data memory stores up to 512 readings
per sensor:
- 10-minute heartbeats = 3.5 days
- 2-hour heartbeats = 42 days
-Over-the-air updates (future proof)
-Free basic online wireless sensor monitoring and
notification system to configure sensors, view data
and set alerts via SMS text and email

*Actual range may vary depending on environment.
**Battery life is determined by sensor reporting
frequency and other variables. Other power options
are also available.
Commercial AA Wireless 0-10 VDC Voltage Meter | Technical Specifications
Supply voltage 2.0?3.8 VDC (3.0?3.8 VDC using power supply) *
Current consumption
0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle),
2.5 mA (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio
TX mode)
Operating temperature range (board circuitry and batteries)-18°C to 55°C (0°F to 130°F) using alkaline
-40°C to 85°C (-40°F to 185°F) using lithium **
Optimal battery temperature range (AA)+10°C to +50°C (+50°F to +122°F)
Integrated memory Up to 512 sensor messages
Wireless range 1,200+ ft non-line-of-sight
Security Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Weight 3.7 ounces

900 MHz product; FCC ID: ZTL-G2SC1 and IC: 9794A-G2SC1.
868 and 433 MHz product tested and found to comply with: EN
300 220-2 V3.1.1 (2017-02), EN 300 220-2 V3.1.1 (2017-02)
and EN 60950
Power Options
The standard version of this sensor is powered by two replaceable 1.5 V AA sized batteries (included with purchase). This
sensor is also available with a line power option. The line powered version of this sensor has a barrel power connector
allowing it to be powered by a standard 3.0?3.6 V power supply. The line powered version also uses two standard 1.5 V
AA batteries as backup for uninterrupted operation in the event of line power outage. Power options must be selected at
time of purchase, as the internal hardware of the sensor must be changed to support the selected power requirements.
PAGE 3
*Hardware cannot withstand negative voltage. Please take care when connecting a power device.
**At temperatures above 100°C, it is possible for the board circuitry to lose programmed memory.
Sensing Specifications
Range 0 - 10 V*
Accuracy +/-(2.0% of Reading + .002 V)
Calibrated Accuracy +/-(0.5% of Reading + .002 V)**
Resolution 1 mV
Input Impedance 247 kOhm
Open Circuit Voltage ~0.000 Volts
Max Rated Input 20 Volts
Lead wire length 2 Wires, 1 ft (12 in), Red (+), Black (-), 18 AWG
(Custom lengths available upon request)
* The sensor is capable of measuring above 10 volts but may not meet the specified accuracy above this value.
**For best results calibrate at a voltage between 50% and 90% of the voltage range.
PAGE 5
Commercial Grade Sensors
Commercial grade sensors are designed for applications in ordinary environments (normal room temperature, humidity
and atmospheric pressure). Do not use these sensors under the following conditions as these factors can deteriorate the
product characteristics and cause failures and burnout.
-Corrosive gas or deoxidizing gas: chlorine gas, hydrogen sulfide gas, ammonia gas, sulfuric acid gas, nitric oxides
gas, etc.
-Volatile or flammable gas
-Dusty conditions
-Low-pressure or high-pressure environments
-Wet or excessively humid locations
-Places with salt water, oils chemical liquids or organic solvents
-Where there are excessively strong vibrations
-Other places where similar hazardous conditions exist
Use these products within the specified temperature range. Higher temperature may cause deterioration of the
characteristics or the material quality.
Industrial Grade Sensors | Type 1, 2, 4, 4X, 12 and 13 NEMA Rated Enclosure
Industrial sensors are enclosed in reliable, weatherproof NEMA-rated enclosures. Our NEMA-rated enclosures are
constructed for both indoor or outdoor use and protect the sensor circuitry against the ingress of solid foreign objects like
dust as well as the damaging effects of water (rain, sleet, snow, splashing water, and hose-directed water).
-Safe from falling dirt
-Protects against wind-blown dust
-Protects against rain, sleet, snow, splashing water, and hose-directed water
-Increased level of corrosion resistance
-Will remain undamaged by ice formation on the enclosure
Proper Installation
If the sensor is not connected to the power source properly, it will
appear that the sensor is broken. Please follow this wiring
diagram to ensure proper performance and detection.
General Description
The Commercial LTE Gateway allows you to control
settings for your sensors without additional IT
infrastructure. All you need is a power source to monitor
your environment and equipment using our
industry-leading devices. The LTE Gateway will
communicate with sensors and to deliver data alerting
you to conditions in a surrounding area.
LTE Gateways connect your sensors to your chosen
monitoring platform using 4G LTE CAT-M1/NB1 cellular
technology. This advanced wireless IoT (Internet of
Things) gateway will accommodate multiple vertical IoT
application segments and wireless sensor management
solutions. Your gateway is equipped with a 24-hour
backup battery. Your Wireless Sensors will continue to
communicate with the sensor portal via cellular
transmission in the event of a power outage. The LTE
Gateway is ideal for applications without an existing wired
internet connection or where existing infrastructure is
dedicated to other resources.
LTE Gateway Features
-Wireless range of 1,200+ feet through 12+ walls *
-Frequency Hopping Spread Spectrum (FHSS)
-Improved interference immunity
-Encrypt-RF® Security (Diffie-Hellman Key Exchange +
AES-128 CBC for sensor data messages)
-Up to 30,000 sensor message memory
-Over the air updates (future proof)
-True plug & play, no hassles for Internet configuration
set-up
-No PC required for operation
-Low-cost cellular service packages
-Local status LEDs with transmission and online status
indicators
-AC power supply
-24 hour battery backup in event of power outage
* Actual range may vary depending on environment.
Example Applications
-Remote Location Monitoring
-Shipping and Transportation
-Agricultural Monitoring
-Vacant Property Management
-Vacation Home Property Management
-Construction Site Monitoring
-Data Center Monitoring
4G LTE Gateway
PAGE 1
4G LTE Gateway Specifications
Models
Cellular MNG2-9-LTE-CCE
Cellular
Cellular Technology
LTE CAT-M1
LTE-only module for global use
(AT&T, Verizon, Telenor, Hologram, US Cellular, and Sasktel)
Cat M1/NB1 deployed bands 2, 3, 4, 5, 8, 12, 13, 20, 28
SIM Card Compatibility Mini-SIM (3FF) 15 mm x 12 mm x 0.76 mm
Power
Input Power 5.0 VDC @ 1 A
Battery Backup
Battery Type: Rechargeable Lithium Polymer
Battery Duration: Up to 24 hours
Battery Cycle Life: 500 times
Battery Safety: IEC62133
Mechanical
LEDs Connectivity, Server, Network Status
Device Memory
Up to 30,000 sensor messages
(Sensor messages will be stored in the event of Internet outage and
transferred when connection is restored)
Enclosure ABS
Dimensions 5.004 x 3.8 x 1.51 in.
Weight 7 ounces
Environmental
Operating Temperature +5 to +45°C (41 to 113°F)
Storage Temperature -20 to +60°C (-4 to 140°F)
Wireless
Transmit Power (EIRP)50 mW (900 MHz), 25 mW (868 MHz), 10 mW (433 MHz)
Antenna Type Connector: SMA
Gain: 4.0 dBi
Wireless Range 1,200+ ft. non-line-of-sight *
Security Encrypt-RF® (256-bit key exchange and AES-128 CBC)
Certifications Safety: IEC 60950-1 and IEC 62368-1; EMC: IEC 55024, IEC 55032, IEC 301489-1, -3, -A, -52, FCC 47
CFR Part 15, subpart B and ICES - 001 Issue 6; RF: 900 MHz product includes model FCC ID:
ZTL-G2SC1 / IC: 9794A-G2SC1 and FCCID: XPY2AGQN4NNN / IC: 8595A-2AGQN4NNN; 868 MHz
product includes Module G2SC1 (IEC 300 220-1, -2); 433 MHz product includes Module G2SC2 (IEC
300 220-1,-2)
PAGE 2
* Actual range may vary depending on environment.
Commercial Grade Cellular Gateways:
Commercial grade cellular gateways are designed for applications in ordinary environments (normal room temperature,
humidity and atmospheric pressure). Do not use these gateways under the following conditions as these factors can
deteriorate the product characteristics and cause failures and burn-out.
-Corrosive gas or deoxidizing gas ? chlorine gas, hydrogen sulfide gas, ammonia gas, sulfuric acid gas,
nitric oxides gas, etc.).
-Volatile or flammable gas.
-Dusty conditions.
-Under low or high pressure.
-Wet or excessively humid locations.
-Places with salt water, oils chemical liquids or organic solvents.
-Where there are excessively strong vibrations.
-Other places where similar hazardous conditions exist.
Use these product within the specified temperature range. Higher temperature may cause deterioration of the
characteristics or the material quality.
PAGE 3
Cellular Coverage Maps:
AT&T Verizon Telenor Hologram US Cellular Sasktel
THE OBAR GBR76
COMPACT RADIAL BLOWER

Based on 25 years of experience and 2 years of research and
development, the patent pending GBR series of compact
radial blowers provide the perfect combination of
performance and design.

PERFORMANCE

GBR76

Built in speed control to customize performance.
Condensate bypass built in.
12 month warranty - 40,000 hr sealed bearings.

DESIGN

Our modular design means the blower and manifold assembly can be removed and replaced as a unit. This makes
repairs cost effective and easy and allows contractors to upgrade systems simply by swapping assemblies.
The GBR series is based on a bypass blower designed to handle combustible materials.
The housing is not required to be air tight, so you can add gauges and alarms without compromising the system.
Built in condensate bypass.
Built in speed control.
Quick disconnect electrical harness.
All UL listed components including UL listed enclosure for outside use.
Wall fastening lugs included.
GBR series roof and wall mounts available to quickly configure the blowers for your installation while providing a
custom built look.

haust.
Universal Drive model accepts voltage from 120-240V without alteration

COST GBR76 SOE GBR76 UD

COMPLETE UNIT $1339.00 $1539.00
3 YEAR WARRANTY $450.00 $550.00

OBAR SYSTEMS INC 2969 ROUTE 23 SOUTH NEWFOUNDLAND NJ 07435 800 949 6227
GBR76 WITH ROOF MOUNT

GBR76 SOE Wattage
SOE 16 150 140 129 118 105 90 75 35 150-320
SOE 12 125 115 100 83 62 39 0 110-200
SOE 8 105 90 70 42 0 60-120
SOE 4 75 50 0 37-50
GBR SOE performance using built in potentiometer set at se

GBR76 UD Wattage
110V 195 158 118 63 20 700-870
220V 197 162 130 89 50 800-1100

Blower Specifications

Enclosure Specifications

Ratings:

Ingress Protection (EN 60529): 66/67

Electrical insulation: Totally insulated
Halogen free (DIN/VDE 0472, Part 815): yes
UV resistance: UL 508
Flammability Rating (UL 746 C 5): complies with UL 508
Glow Wire Test (IEC 695-2-1) °C: 960
NEMA Class: UL Type 4, 4X, 6, 6P, 12 and 13
Certificates: Underwriters Laboratories

OBAR SYSTEMS INC 2969 ROUTE 23 SOUTH NEWFOUNDLAND NJ 07435 800 949 6227
160
200
240
280
320
360
8.0
10.0
12.0
14.0
16.0
18.0
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.
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GBR76 SOE with 4" piping GBR76-SOE SOE wattage
GBR76-
SOE
wattage
0
40
80
120
0.0
2.0
4.0
6.0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160
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Flow Rate CFMObar manufacturer date: 10/11 Test data from WPB-radon.com
Wattage
12/13/22, 11:10 AM The Determinator - Delphian Corporation
https://www.delphian.com/Determinator.htm 1/4
Contact
Products
Leak Detection
Help With a System
Technology
Glossary
Home
The
Determinator
infrared gas
monitor
Principle of Operation
Determines Gas
Routine Maintenance
Theory of Operation
4-20 mA Signals and Error Codes
Construction | Part Numbers | Options
Why the Determinator is better than other fixed point
infrared gas monitors
Part Numbers
How to Specify an Infrared System
The Remediator
Calibrating the Determinator
The Determinator - Installation
The Determinator - Setup
***** FM and CSA Approved *****
The Delphian Determinator (Fixed Point Infrared) sensor is a smart infrared hydrocarbon gas detector. It
has no moving parts. It displays gas concentrations up to and above 100% LEL including over-range
(above 120% LEL) concentrations up to 999% LEL. It can determine which hydrocarbon gas is being
detected and transmit a 4-20 mA signal proportional to the LEL concentration of that gas or vapor. The
Determinator displays the correct LEL as well as the gas detected on its five digit LED display. It can be
set to show up to three gas alarm levels. An optional four-relay alarm module (SLAM) can be connected
directly to the Determinator so that local alarms can be actuated in the event of a gas alarm or failure. The
detector head is designed so that all normal operations, including checking calibration and changing
alarm levels can be done in the field without declassifying the area. The built-in self test continuously
monitors the hardware and software. Minor fault conditions are displayed on the LED display. Four
informational and six possible critical malfunctions are transmitted on the 4-20 mA line. Standard RS
422/485 output is also available. Using a separate COMO module, the Determinator can be interfaced on
Modbus RTU protocol highways.
DETERMINES GAS
Delphian’s patented multiple active channel system allows the sensor to recognize and identify multiple
hydrocarbon gases. The sensor detects hydrocarbon gases only. It cannot detect and will not be affected
by hydrogen or other non-hydrocarbon gases. When complex mixtures of hydrocarbon gases are present,
especially in substantial concentrations, it will display its best estimate of the correct LEL.
List of gases that the Determinator can recognize (pn 364-335)
LOW ROUTINE MAINTENANCE
The Determinator is a very low maintenance instrument. It does not require span calibration. Zero point
adjustments are required infrequently.
12/13/22, 11:10 AM The Determinator - Delphian Corporation
https://www.delphian.com/Determinator.htm 2/4
PRINCIPLE OF OPERATION
A beam of infrared energy is directed to a detector through gas which is drawn into the sampling cell by a
patented convection mechanism. The beam is filtered to match the absorption of hydrocarbon molecules.
If a hydrocarbon gas is present in quantities over 5% LEL, it will absorb energy from the beam and the
detector will register a drop in the total transmission of infrared energy. This drop in transmission can be
directly related to the concentration of gas.
THEORY OF OPERATION
SENSOR
The Delphian Determinator (Fixed Point Infrared) Combustible Hydrocarbon (CHC) sensor uses infrared
light to probe for the presence of hydrocarbons. The detection process is independent of the fact that the
gases of interest are combustible, therefore the presence of oxygen is immaterial.
THE SCIENCE BEHIND THE SENSOR
All CHC gases have one or more hydrogen (H) atoms chemically bonded to a carbon (C) atom. The bond
between the H and the C is elastic and the distance between the two atoms can oscillate. The oscillation
is activated when energy, with a wavelength of about 3.3 micrometer (3.3 µm, 0.00013 inch), strikes the
molecule. The precise wavelengths that interact with any one gas are unique for that gas. The energy at
3.3 µm is qualitatively no different from visible light, except that that the human eye can not "see" the light.
For this reason we call this kind of energy "infrared light."
Infrared-based CHC gas sensors differ from catalytic bead sensors in the variation range of the transfer
factors for different gases relative to methane gas.
Catalytic beads exhibit transfer factors between 0.6 and 4.0. For the common IR sensors with one
reference and one active channel the transfer factors can easily vary in a range of 100 to 1. Therefore it is
essential to know which gas is present at the sensor in order to obtain a reliable gas concentration in
terms of % LEL.
The Delphian FPIR sensor consists of a gold-surfaced "light pipe" with an opening at the bottom and the
top. The atmosphere containing the combustible gas enters the tube through a flame arrestor at the
bottom opening and exits through an opening at the top. The gas diffusion is enhanced by a heater at the
base of the pipe. A miniature infrared source at the bottom directs infrared into the pipe. At the opposite
end of the pipe from the source is an infrared sensitive receiver with four custom filters. Each filter cuts a
narrow slice out of all the wavelengths coming from the infrared source. Three filters transmit energy in
neighboring slices of wavelengths that interact with CHC gases. One filter transmits only energy that does
not interact with CHC gases. The signals from the three detectors behind the interacting filters are called
the active channels, and the fourth signal from the detector behind the non-interacting filter is the
reference channel.
Most hydrocarbons exhibit characteristic ratios of interaction with IR energy in the three wavelength
slices. The microprocessor in the Delphian sensor evaluates the signals and deduces from the ratios of
the three active channels which hydrocarbon has entered the light pipe. Once the gas has been identified,
the % LEL is computed for that gas.
WARNING: The IR-based sensor can accurately measure the concentration of only one CHC gas at one
time. A mixture of two or more CHC gases of concentrations above 5% LEL may be either misinterpreted
by the instrument as a different gas than either of the present gases, or, more likely, the instrument may
not identify the gas at all. In this case the microprocessor computes a % LEL gas concentration based on
a gas that it believes provides the highest margin of safety (worst case). This kind of uncertainty can only
occur if similar concentrations of different gases are present, such as 10% LEL of methane and 8% LEL
of butane. A background of multiple gases, each in concentrations of less than 1% LEL will not severely
impact the identification of a CHC above 15-20% LEL concentration. More about the infrared sensor
CONSTRUCTION
The sensor and conduit box are explosion proof.
The conduit box is epoxy coated to prevent corrosion. The internal sensor components, as well as all
connectors exposed to the atmosphere, are gold plated.
All components are designed to plug into an Interface Module. This module makes wiring the Detector
Head easy as well as permitting rapid replacement of components.
12/13/22, 11:10 AM The Determinator - Delphian Corporation
https://www.delphian.com/Determinator.htm 3/4
Sensors are designed to withstand "hot plugging" in and out of the Interface Module while power is
supplied.
All connectors are unique and are keyed to prevent incorrect connections.
All working electronics are encapsulated to prevent deterioration from dust and humidity.
4-20 mA Signals and Error Codes
The sensor displays all detected warnings and failures.
The following messages are transmitted on the 4-20 mA signal line:
>23.2 mA Over-range (>120%LEL)
20 mA Full scale
4.0 to 23 mA %LEL displayed
negative LEL is a sensor failure indicated by 0.2 mA (acetylene can cause
this failure)
2.3 mA CPU POST successful, no output
2.1 mA Off-line
1.9 mA Zero adjust failed - off-line
1.7 mA Zero adjustment in progress -offline
1.5 mA Voltage too high to function
1.3 mA Sensor missing or not connected
1.1 mA Optics dirty - light path blocked
0.9 mA Lamp failed
0.7 mA Low power line voltage
0.5 mA Sensor Module circuit fault
0.3 mA Processor Module circuit fault
<0.2 mA No power, system fault
NOTE: In the event 1-5 mA option is chosen only the
high and low gas alarms and system fail is transmitted.
click to see enlargement
PART NUMBERS
Standard Configuration
includes:
conduit box, interface module
and processor module:
With aluminum sensor:
364-850-01
With stainless steel sensor:
364-850-02
OPTIONS
Splash/Dust Guard—for severe environmental and operational conditions.
Lightning arrestor —where high-energy transient suppression is necessary.
SLAM—local alarm relay module (relays for 3-gas alarms and one for fail) connects to Interface Module.
Reclamation Adaptor —to allow the sensor to be mounted externally to a duct or area outside of the
sensor's temperature range.
Why the Determinator is better than other FPIR gas monitors:
Altitude adjustment: altitude can make up to a 25% difference in readings. Delphian's patented
altitude adjustment corrects this problem.
Will provide correct LEL and linearization simultaneously for a wide range of CHC gas/vapors
consistently (patent pending).
Competitive models are often switch selectable between a few gases, but for all gases except the
one selected, they compute their LEL incorrectly.
Virtually immune to the water condensation and temperature/humidity variations which cause
competitive models to give inaccurate readings.
Bright, large five-digit LED display allows user to easily see gas alarms, the gas being detected and
any fault conditions.
Easy to change alarm settings in the field, without removing the cover.
No moving parts.
Smaller footprint than most competitive models.
12/13/22, 11:10 AM The Determinator - Delphian Corporation
https://www.delphian.com/Determinator.htm 4/4
Uses the same conduit box and wiring as Delphian's catalytic bead sensor, so field replacement of
existing catalytic sensors is easy.
Rugged construction and encapsulated electronics protect it from water, corrosion and normal
vibration.
Response time and recovery of the Determinator is much faster than that of competitive units we
have tested. Design of light Pipe (patent pending) allows more rapid response and recovery times.
2 year warranty.
Smart sensor: sensor is programmed with the latest gas information so field electronics don't need to
be changed or reprogrammed.
Diagnostic signals: 4-20mA feedback with10 different diagnostic codes.
The Determinator is designed to handle rapid temperature changes.
Glossary of Gas Detection Terms | How to specify a Delphian infrared system
Copyright ©2022 Delphian Corporation, 220 Pegasus Avenue, Northvale, N.J., U.S.A.

Gas Detection
FE ATURES & BENEFITS
Sensepoint XCL
Fixed Gas Detector
Sensepoint XCL is a fixed point gas leak detector that is designed to meet
the needs of commercial and light industrial applications. With over 50
years experience in gas leak detection, Honeywell offers a flexible range
of highly-reliable sensing devices to meet those needs.
• Quicker installation
• Rapid configuration
• Simple to operate
• Straightforward to maintain
Honeywell innovation enables customers to pair the gas detector with
their mobile phone, and then use an app to perform many tasks related
to installation, commissioning and maintenance.
Flexible Output Options
Sensepoint XCL is available with either mA loop analog output or
Modbus RTU with the option for relays on both. The result is a flexible
solution that can easily be incorporated into legacy systems as well as
new installations.
Faster Installation
Everything you need for installation is in the box, including simple drilling
templates.
Easy Control and Maintenance
Sensepoint XCL's smartphone interface makes for much faster
calibration, configuration and bump tests. Inspecting the status and
settings of individual Sensepoint XCL detectors is simple. Use the
mobile app to:
• Read gas concentrations in real-time
• Reconfigure settings
• Check unit histories
Automated Reporting
Increase the efficiency of your operations and reduce administration
time. The app and Sensepoint XCL provides easy access to diagnostic
information and generates calibration reports at the touch of a screen.
Compatible System Controller
Touchpoint Plus is the perfect complement to Sensepoint XCL, providing
an intuitive, easy to operate gas detection solution to meet the needs of
your business.
Visual Integration
Sensepoint XCL is designed with the needs of
building architects in mind. Clean aesthetics
and a choice of colors mean that the detector
is ideal for public spaces like lobbies and retail
environments.
Typical Applications
• Kitchens and food processing
• Manufacturing facilities and factories
• Hospitals
• Retail sites
• Transportation and parking
• Laboratories
• Hotel and leisure
• Apartments, accommodation blocks and
condominiums
Accessories
• Calibration cap / flow housing
• Duct mount kit for round or flat profile ducts
• Choose from a range
of mA or Modbus
output versions for
flexible system design
to meet the
customers
requirements.
• Selectable source or
sink current for
analog output
enables one detector
to be suitable for both
system
configurations.
• Optional relay output
for external control
systems or alarming
devices enables easy
integration and local
indication.
• The ingress
protection of IP65
allows units to be
mounted in wash
down areas.
• Multi-color visual
indicator to show
status makes it easier
to know the detector
status immediately
and identify detectors
that require attention
or are warning of
danger.
• Gassing port for
easier bump test of
units installed in
inaccessible
locations. No need to
purchase a separate
accessory and thus
saves money.
• Manage the detector
without making a
physical connection.
Remove the need for
physical access to
hard-to-reach
devices.
• Simplified
maintenance with
familiar smartphone
technology saves
money and time.
Sensepoint XCL Technical Specifications
For more information
www.honeywellanalytics.com
Europe, Middle East, Africa
Life Safety Distribution GmbH
Tel: [phone] (Freephone number)
Tel: [phone] (Alternative number)
Middle East Tel: [phone] (Fixed gas detection)
Middle East Tel: [phone] (Portable gas
detection)
Americas
Honeywell Analytics Distribution Inc.
Tel: [phone]
Toll free: [phone]
RAE Systems by Honeywell
Phone: [phone]
Toll Free: 1.888.723.4800
Asia Pacific, India
Honeywell Analytics Asia Pacific
North Asia Tel: [phone]
South East Asia Tel: [phone]
India Tel: [phone]
China Tel: [phone]-3000
www.honeywell.com
DS_01178 | Rev. 01 | 05/2018
© 2018 Honeywell International Inc.
PHYSICAL PROPERTIES
DIMENSIONS 113 x 113 x 59 mm
( 4.4 x 4.4 x 2.3 in )
WEIGHT 500 g (1.1 lb)
CASING MATERIAL Polycarbonate (charcoal or white)
INGRESS PROTECTION RATING IP65, Type 4 (in accordance with
NEMA 250)
LIFETIME 10 years (excludes sensor)
AVAILABLE SENSORS
FLAMMABLE, TOXIC GASES AND
OXYGEN RANGES
• Combustible: 0 to 100 % LEL (factory
calibrated to Methane)
• O₂: 0 to 25% vol
• CO: 300 ppm (adjustable between 50
and 1000 ppm)
• H₂: 1000 ppm
• H₂S Low Range: 50 ppm (adjustable
between 10 and 50 ppm)
• H₂S High Range: 100 ppm (adjustable
between 50 and 200 ppm)
• NO₂: 20 ppm (adjustable between
5 and 50 ppm)
• NH₃: 200 ppm (adjustable between
50 and 200 ppm)
• CO2 (ppm range): 5,000 ppm
(adjustable between 1,000 and 5,000
ppm)
• CO2 (% vol range): 5.0% vol
(adjustable between 1.0 and 5.0%
vol)
POWER SUPPLY
NOMINAL DC INPUT VOLTAGE 24 V DC†
NOMINAL AC INPUT VOLTAGE 24 V AC‡, 50/60 Hz
MAXIMUM INRUSH CURRENT 850 mA
OUTPUT
ANALOG OUTPUT 0 to 22 mA
DIGITAL OUTPUT Modbus RTU
RELAY OUTPUT 2 relays rated at 24 V DC / 240 V AC, 5 A
MAXIMUM POWER CONSUMPTION
mA VERSIONS < 1.2 W (toxic), < 1.7 W (flammable and CO2)
MODBUS VERSIONS < 0.7 W (toxic), < 1.2 W (flammable and CO2)
RELAY VERSIONS Additional 0.6 W total
† mA versions: 11 to 32 VDC, Modbus versions: 9 to 32 VDC
‡ All versions: 20 to 27 VAC
CONNECTION
TYPE Pluggable rising clamp style, 0.5 to
1.5 mm2, 20 to 16 AWG.
USER INTERFACE
VISUAL INDICATOR Multi-colour LED light ring
• Green: normal§
• Flashing red: Alarm
• Flashing green and yellow: Warning
• Flashing yellow: Fault
• Solid yellow: Inhibited
• Flashing blue: Bluetooth pairing in
progress
• Solid blue: Bluetooth connection
established
WIRELESS INTERFACE Bluetooth 4.0 (Bluetooth Low Energy).
Dedicated mobile app, enabling wireless
configuration and maintenance.
Connect up to 10 m away (mobile
device dependent). Use a compatible
smartphone or other mobile device
running Android 4.3 or above.
OPERATING ENVIRONMENT
OPERATING TEMPERATURE
STORAGE TEMPERATURE
HUMIDITY
ATMOSPHERIC PRESSURE
−20 to 50°C (−4 to 122 °F) 0 to 30°C
(32 to 86 °F)
15 to 90% RH (non-condensing)
90 to 110 kPa
APPROVALS
ELECTRICAL SAFETY EN/UL/IEC61010-1
CSA-C22.2 No. 61010-1-12
EMC EN 50270
RADIO RED, FCC
OTHER UL2075 (CO and CH4), AS 1668.2
§LED behavior in normal condition can be changed by the user: solid green, green confidenceflash or off.

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Grainger.com®
2023INDUSTRIAL & SAFETY REFERENCE GUIDE NO.
414
©2023 W.W. Grainger, Inc. W-FP414CR
The Grainger Shipping Box design is a registered trademark of W.W. Grainger, Inc.
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Attic Ventilators
Find even MORE on Grainger.com®1-800-GRAINGER (472-4643)
HVAC & REFRIGERATION
2968
Scan. Order. Done.
Details on page A1.
Wind-Driven Turbine Attic Ventilators
Externally braced for strength and perfect alignment. Bronze, oil-impregnated top bearing. The 4", 6", and
8" vents have a bottom thrust-type pivot bearing with a hardened steel ball riding in a hardened steel seat.
The 10" and larger vents use a bottom thrust-type ball bearing. Galvanized steel construction with aluminum
bracing on 4" to 14" units; galvanized steel bracing on 16" to 24" units.
Optional adjustable Base 4C505 allows vertical mounting of Ventilator 2C531 on 0/12 to 7/12 pitch roofs.
Includes 20" x 20" flashing for weatherproof installation.
4C505
2C531 Description Mfr.Model ItemNo.Accessories
Adjustable Roof Base, 6", For Use With 2C528 AB06G 33MH61
Adjustable Roof Base, 8", AB08G 33PM38
Adjustable Roof Base, 10", For Use With 2C530 AB10G 33PM39
Adjustable Roof Base, 12", For Use with 2C531 AB12G 4C505
Flat Roof Base, 4", For Use With 4C016 FB04G 33PM40
Flat Roof Base, 6", For Use With 2C528 FB06G 33PM41Flat Roof Base, 8", For Use With 2C529 FB08G 33PM42Flat Roof Base, 10", For Use With 2C530 FB10G 33PM43
Flat Roof Base, 12", For Use With 2C531 FB12G 33PM44
Flat Roof Base, 14", For Use With 2C532 FB14G 33MH59
Flat Roof Base, 16", For Use With 2C533 FB16G 33PM45
Flat Roof Base, 18", For Use With 2C534 FB18G 33MH58
Flat Roof Base, 20", For Use With 2C802 FB20G 33PM46
Flat Roof Base, 24", For Use With 2C803 FB24G 33MH60Bearing Repair Kit, 4" to 14" Turbines, For Use With 2C528, 2C529, 2C530, 2C531, 2C532, 4C016 3WAY 33PM47Bearing Repair Kit, 16" to 20" Turbines, For Use With 2C533, 2C534, 2C802 4WAY20 33PM48
Bearing Repair Kit, 24" Turbines, For Use With 2C803 4WAY24 33PM49
Throat
Dia.
CFM @
4 mph Wind
Overall
Height
Overall
Width
Mfr.
Model
Item
No.
Ventilators
4 in 126 cfm 12 in 10 1⁄4 in TV04G 4C016
6 in 147 cfm 14 1⁄2 in 12 3⁄4 in TV06G 2C528
8 in 255 cfm 15 in 14 1⁄4 in TV08G 2C529
10 in 425 cfm 16 1⁄4 in 16 1⁄4 in TV10G 2C530
12 in 631 cfm 17 in 19 in TV12G 2C531
14 in 700 cfm 19 3⁄4 in 22 3⁄4 in TV14G 2C532
16 in 950 cfm 21 3⁄4 in 25 1⁄2 in TV16G 2C533
18 in 1,200 cfm 24 in 29 in TV18G 2C534
20 in 1,700 cfm 25 13⁄64 in 31 5⁄8 in TV20G 2C802
24 in 2,350 cfm 28 1⁄4 in 35 3⁄4 in TV24G 2C803
For proper attic ventilation, the Home Ventilation Institute recom-
mends a system that provides at least 10 air exchanges per
hour. Use the following formula to determine the fan capacity
(cu. ft. per min., cfm) needed to
provide this minimum airflow:
Attic Square Feet x 0.7 = cfm
Note: For roofs pitched 7/12 or higher, you may want to
add 20% more cfm capacity to handle the larger volume
of attic space; 30% more for roofs 11/12 and higher.
How to Select Power Attic Ventilators
120V Attic Ventilators
Garage
Mounted
45AM66
Gable
Mounted
10W199
Roof Mounted
10N201
▪Automatic control
Max.Attic Area CFM @0.000" SP Amps Included with Ventilator Brand Mfr.Model ItemNo.
Gable Mounted
1,500 sq ft 1060 1.0 Guard, Thermostat Dayton 347HY1 347HY1
1,500 sq ft 1095 1.0 Guard, Shutter, Thermostat Dayton 347HX9 347HX9
1,600 sq ft 800 1.4 Guard, Shutter, Thermostat Dayton 347HX8 347HX8
1,630 sq ft 1220 3.1 Thermostat Dayton 10W193 10W193
1,630 sq ft 1220 3.1 Humidistat, Thermostat Dayton 10W198 10W198
1,900 sq ft 1380 3 Thermostat Dayton 10W196 10W196
1,900 sq ft 1380 3 Humidistat, Thermostat Dayton 10W201 10W201
2,300 sq ft 1650 3.15 Thermostat Dayton 10W194 10W194
2,300 sq ft 1650 4 Humidistat, Thermostat Dayton 10W195 10W195
2,300 sq ft 1650 4 Thermostat Dayton 10W197 10W197
2,300 sq ft 1650 4 Humidistat, Thermostat Dayton 10W199 10W199
2,300 sq ft 1860 1.3 Guard, Shutter, Thermostat Dayton 347HY0 347HY0
3,000 sq ft 1495 1.9/0.6 Accessory Bag, Smart Control Hub, Vent Covers Quietcool AFG SMT PRO-2.0 60RG26
3,000 sq ft 1947 1.9 A Thermostat Quietcool AFG PRO-2.0 787L79
4,000 sq ft 2801 2.1/1.0/0.3 Accessory Bag, Smart Control Hub Quietcool AFG SMT ES-3.0 60RG28
4,000 sq ft 2860 2.1/1.4 Accessory Bag, Smart Control Hub, Vent Covers Quietcool AFG SMT PRO-3.0 60RG27
Garage Mounted
2,300 sq ft 1452 —Guard, Thermostat Quietcool GA ES-1500 45AM66
Roof Mounted
2,100 sq ft 1500 2.3 Thermostat Dayton 10N201 10N201
2,100 sq ft 1500 2.3 Humidistat, Thermostat Dayton 10N202 10N202
2,285 sq ft 1600 8 Guard Broan 356BK 39W620
3,000 sq ft 2116 2.3/1.1/0.3 Accessory Bag, Smart Control Hub Quietcool AFR SMT ES-2.0 60RG29
Blade Material Shutter Opening Required
Fits
Fan Dia.
Mfr.
Model
Item
No.
Backdraft Damper / Gable Shutters
White Painted Aluminum 17 in x 17 in 16 in 4YN20 4YN20
Mill Finish Aluminum 17 in x 17 in 16 in 3HHR1 3HHR1
Solar-Powered Attic Ventilators
Gable
Mounted
787L77
Roof
Mounted
4YCK9
These ventilators install without the need for wiring or electrical hookup and operate during peak daylight
hours to help increase airflow and remove moisture. The solar panels are resistant to wind, hail, and other
environmental hazards.
Max.
Attic Area
CFM @
0.000"
SP Includes
Control
Method Dome Material Brand
Mfr.
Model
Item
No.
Gable Mounted
2,600 sq ft 1217 Thermostat, 40 Watt Solar
Panel, Accessory Bag Automatic —Quietcool AFG SLR-40W 787L77
Roof Mounted
1,550 sq ft 1000 Detached Solar Panel, 25 ft Cord Manual Mill Finish Galvanized Steel Maxx Air VX1000SOLMILUPS 4YCK9
1,550 sq ft 1000 Detached Solar Panel, 25 ft Cord Manual Black Galvanized Steel Maxx Air VX1000SOLBLKUPS 4YCL1
1,550 sq ft 1000 Detached Solar Panel, 25 ft Cord Manual Brown Galvanized Steel Maxx Air VX1000SOLBRNUPS 4YCL2
1,550 sq ft 1000 Detached Solar Panel, 25 ft Cord Manual Weathered Gray Galvanized Steel Maxx Air VX1000SOLWGUPS 4YCL3
1,550 sq ft 1000 Detached Solar Panel, 25 ft Cord Manual —Maxx Air VX2515SOLUPS 4YCL4
1,900 sq ft 791 Thermostat, Accessory Bag Automatic —Quietcool AFR SLR-40W 787L78
3,200 cu ft 537 —Automatic Black Acrylic ABS Plastic Broan 345SOBK 20AZ87
3,200 cu ft 537 —Automatic Weather Wood Acrylic ABS Plastic Broan 345SOWW 20AZ88
These attic ventilators turn on automatically and provide proper airflow to help
prevent heat and moisture buildup. They can reduce energy costs by circulating
air, cooling attics, and reducing overall air conditioner strain.

APPENDIX E

VIMS POC Information

GC7466/CAR240019 1 June 2024
Vapor Intrusion Mitigation System Point of Contact Information
Prospective Developer (PD): Northwestern Housing Enterprises, Incorporated Contact Person: E.G. “Ned” Fowler, President [phone] [phone]
Email: [e-mail] Contractor for PD: ALH General Contractor Contact Person: Alan Herman [phone] [phone]Email: [e-mail] Environmental Consultant and Engineer of Record: Geosyntec Consultants of NC, P.C. Contact Person: Mike Burcham [phone] [phone]Email: [e-mail] VIMS Installation Contractor: TBD Phone Numbers: Office: BD Mobile: BD Email: TBD Brownfields Program Project Manager: Bill Schmithorst Phone Numbers: Office: Mobile: Email: [e-mail]

APPENDIX F

Historical Environmental Data
Phase II Environmental Site Assessment
(September 2021)

Historical Environmental Data
HORIZ
O
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YOUNG CIRCLE
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COMMUNICATIONSFACILITY
UNKNOWN - RESEMBLESSALVAGE BUSINESS
PREGNANCYCENTERCONSIGNMENTSHOP
RESIDENCE
RESIDENCE
RESIDENTIAL
RESIDENTIAL
SUBJECT PROPERTY±1.92 ACRES
RESIDENCE
TRANSFORMERS
TRANSFORMER
WOODED AREAS WITHDENSE OVERGROWTHINACCESSIBLE BY DRILL RIG
WOOD
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PILES OF WOODCHIPS
TRANSFORMERS
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WOODED AREAS WITHDENSE OVERGROWTHINACCESSIBLE BY DRILL RIG
V:\
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1 inch = 80 ft.
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LEGEND
APPROXIMATE AREA WITH HISTORICAL STRUCTURES
TEMPORARY MONITORING WELL LOCATION
NOTES:
1.) WELL LOCATIONS DETERMINED BY A HANDHELD GPS DEVICE.
BU
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NOTES:
1.) PROBE LOCATIONS DETERMINED BY A HANDHELD GPS DEVICE.
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74-83-9 75-09-2 108-88-3 ---7439-97-6 7440-38-2 7440-39-3 7440-43-9 7440-47-3 1854-02-99 7439-92-1 7782-49-2 7440-22-4 50-00-0
TW-1 12/7/2021 ND 0.45 0.63 ND ND ND 173 0.407 7.59 0.025 6.01 ND ND 94
TW-2 12/7/2021 1.2 0.54 0.66 ND ND 12.7 1850 0.689 26.8 0.014 11.7 ND ND 200
TW-3 12/7/2021 ND ND ND ND ND 10.9 5120 1.62 13 ND 3.24 ND ND 92
10 5 600 NA 1 10 700 2 10 NL 15 20 20 600
100,000 5,000 260,000 NA NL NL 700,000 NL 10,000 NL 15,000 NL 20,000 NL
Notes:
1.) All results provided in ug/L (micrograms per liter) or parts per billion
2.) Compounds analyzed for by laboratory but not listed were not detected above laboratory detection limits. See the laboratory report included in the Appendix for a full list of constituents.
3.) NC 2L Standard - North Carolina Groundwater Quality Standard as per NC Administrative Code 15A NCAC 02L
4.) GCLs for Groundwater = NCDENR UST Section Gross Contamination Levels for Groundwater
NA = Not Applicable.
ND = Compound Not Detected.
Result = Result Exceeds Laboratory Detection Limits
Result = Result Exceeds 2L Standard
Result = Result Exceeds GCL Value
7470/6010/7196 - Metals
Table 1
Burnsville, Yancey County, North Carolina
Saw Mill Hollow Road
WR Project Number: 08210844.00
Buzzard Rock LLC Property
Summary Of Groundwater Analytical Results (VOCs, Metals, and Formaldehyde)
NC 2L Standard
GCLs for Groundwater
8260 - Volatile Organic CompoundsAnalytical Method
Sample
ID
Date
Collected
Page 1 of 1
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3/106-42-3 95-47-6 98-82-8 103-65-1 622-96-8 108-67-8 95-63-6
VP-1 12/7/2021 130 ND ND ND ND 300 1200 350 420 ND 4000 620 2200 620 38 110 470 110 390
VP-2 12/7/2021 0.58 1.2 69 12 7 3.5 22 14 8.7 ND 220 22 94 16 1.4 2.3 8 1.2 3.5
VP-3 12/7/2021 ND ND ND 53 ND ND 180 74 59 7.9 1500 170 880 220 11 30 170 37 150
VP-4 12/7/2021 ND ND ND ND ND ND 84 53 21 ND 1100 130 680 160 7.4 19 110 27 100
VP-5 12/7/2021 13 ND ND ND ND ND 2000 74 78 ND 620 67 320 80 ND 16 86 24 84
Notes:
1.) All results are provided in µg/m3 (micrograms per cubic meter)
ND = Not Detected by Laboratory
Result = Result Exceeds Laboratory Detection Limits
Result = Result Corresponds to the Maixmum Concentration for that Particular Targeted Compound for Use in NCDEQ Risk Calculator
2.) Compounds analyzed for by laboratory but not listed were not detected above laboratory detection limits. See the laboratory report included in the Appendix for a full list of constituents.
Analytical Method TO-15 - Volatile Organic Compounds
Sample
ID
Date
Collected
Burnsville, Yancey County, North Carolina
Table 2
Summary of Soil Vapor Results (VOCs - Detections only)
Buzzard Rock LLC Property
WR Project Number: 08210844.00
Saw Mill Hollow Road
Page 1 of 1

Supplemental Assessment Report
(September 2022)

Historical Environmental Data
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Sawmill Hollow Road
US Highway 19E
Fair Haven Drive
Segment 4
Segment 5
Segment 3
Segment 2
Segment 1
SB-06
SB-07
SB-05
SB-04
SB-03
SB-02
SB-01
SB-08
SB-09
SB-10
SG-04
SG-05
SG-03
SG-02
SG-01
SG-08
SG-06
SG-07
SG-09
SG-10
VP-1
VP-3
VP-4
VP-2
VP-5
TW-1 TW-3
TW-2
N:\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\Supplemental Report\Figure 2 Sample Location Map.mxd 12/21/2022 10:03:50 AM
Sawmill Hollow RoadBurnsville, North Carolina
Sample Location Map
0 50Feet
³Figure
2Asheville, NC December 2022
LegendSite BoundaryFormer BuildingProposed CommunityCenterProposed Housing Unit
Proposed RoadSampling Segments
!(Soil Boring Location
!(Soil Gas Sample Location
>Historical Soil Vapor Probe
>Historical Off-Site SoilVapor Probe
!>Historical TemporaryMonitoring Well
!>Historical Off-SiteTemporary Monitoring WellNotes:1. Parcel boundary from Yancey County GIS.2 Basemap from Source: Esri, Maxar, Earthstar Geographics, and the GIS UserCommunity.
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Sawmill Hollow Road
US Highw
Fair Haven Drive
Segment 4
Segment 5
Segment 3
Segment 2
Segment 1
SB-06
SB-07
SB-05
SB-04
SB-03
SB-02
SB-01
SB-08
SB-09
SB-10
SG-04
SG-05
SG-03
SG-02
SG-01
SG-08
SG-06
SG-07
SG-09
SG-10
VP-1
VP-3
VP-4
VP-2
VP-5
TW-1
TW-3
TW-2
N:\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\Supplemental Report\Figure 3 Soil Results Map VOCs.mxd 12/22/2022 11:52:19 AM
Sawmill Hollow RoadBurnsville, North Carolina
Soil Sample Detections Map
VOC Analysis
0 50
Feet
³Figure
3Asheville, NC December 2022
Legend
Site Boundary
Former Building
Proposed Community
Center
Proposed Housing Unit
Proposed Road
Sampling Segments
!(Soil Boring Location
!(Soil Gas Sample Location
>Historical Soil Vapor Probe
>Historical Off-Site Soil Vapor
Probe
!>Historical Temporary
Monitoring Well
!>Historical Off-Site
Temporary Monitoring WellNotes:
1. Parcel boundary from Yancey County GIS.
2. Only detected compounds are presented.
3. Soils recovered from all borings were screened with a photo ionization detector (PID). Depth intervals exhibitng the greatest response in each
segment were selected for volatile organic compound (VOC) analysis.4. Soil sampling results were compared to the North Carolina Department of Environmental Quality (NCDEQ) Residential Preliminary Soil
Remediation Goals (PSRG) (July 2022).
5. Sample depth is presented in feet below land surface (ft BLS).6. Results are presented in milligrams per kilogram (mg/kg).7. Basemap from Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community.
2-Butanone (MEK) 0.0133 J
Acetone 0.202
Toluene 0.0499
4 ft BLS
SG-02
Acetone 0.0223 J
7 ft BLS
SB-02
Acetone 0.044 J
4 ft BLS
SB-04
2-Butanone (MEK) 0.0105 J
Acetone 0.0874
2-Butanone (MEK) 0.0146 J
Acetone 0.127
SB-03 Duplicate
8 ft BLS
SB-03
2-Butanone (MEK) 0.0197 J
Acetone 0.310
Toluene 0.00483 J
2 ft BLS
SB-06
Acetone 0.291
Methyl acetate 0.0568
Acetone 0.315
7 ft BLS
5 ft BLS
SG-04
Acetone 0.0369 J
Methyl acetate 0.0337
2-Butanone (MEK) 0.0104 J
Acetone 0.0847
1 ft BLS
SB-08
5 ft BLS
2-Butanone (MEK) 5,500
Acetone 14,000
Methyl acetate 16,000
Toluene 990
NCDEQ Residential PSRG
SG-09
3 ft BLS
No VOCs detected
SB-09
73 ft BLS
No VOCs detected
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Sawmill Hollow Road
US Highw
Fair Haven Drive
Segment 4
Segment 5
Segment 3
Segment 2
Segment 1
SB-06
SB-07
SB-05
SB-04
SB-03
SB-02
SB-01
SB-08
SB-09
SB-10
SG-04
SG-05
SG-03
SG-02
SG-01
SG-08
SG-06
SG-07
SG-09
SG-10
VP-1
VP-3
VP-4
VP-2
VP-5
TW-1
TW-3
TW-2
N:\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\Supplemental Report\Figure 4 Soil Results Map SVOCs.mxd 12/22/2022 12:28:04 PM
Sawmill Hollow RoadBurnsville, North Carolina
Soil Sample Detections Map
SVOC and Metals Analysis
0 50
Feet
³Figure
4Asheville, NC December 2022
Legend
Site Boundary
Former Building
Proposed Community
Center
Proposed Housing Unit
Proposed Road
Sampling Segments
!(Soil Boring Location
!(Soil Gas Sample Location
>Historical Soil Vapor Probe
>Historical Off-Site Soil Vapor
Probe
!>Historical Temporary
Monitoring Well
!>Historical Off-Site
Temporary Monitoring WellNotes:
1. Parcel boundary from Yancey County GIS.
2. Only detected semi-volatile organic compounds (SVOCs) and metals are presented.
3. Soils for composite samples collcted from soil borings (SB) and soil gas borings (SG) within each segment.4. Orange shading indicates the compound was detected above the North Carolina Department of Environmental Quality (NCDEQ)
Residential Preliminary Soil Remediation Goals (PSRG) (July 2022).
5. Composite sample depth is presented in feet below land surface (ft BLS).
6. Results are presented in milligrams per kilogram (mg/kg).7. Basemap from Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community.
Anthracene 3,600
Benzaldehyde 170
Benzo[a]anthracene 1.1
Benzo[b]fluoranthene 1.2
Chrysene 120
Dibenzofuran 16
Fluoranthene 480
Indeno[1,2,3-cd]pyrene 1.2
Naphthalene 2.1
Pentachlorophenol 1.0
Phenanthrene NC
Pyrene 360
Arsenic 0.68
Barium 3,100
Cadmium 1.4
Chromium, Total 24,000
Lead 400
Mercury 2.3
Hexavalent Chromium 0.31
NCDEQ Residential PSRG
SVOCs
Arsenic 1.34 J
Barium 81.0
Cadmium 0.121 J
Chromium, Total 19.8
Lead 16.0
Mercury 0.0462
Hexavalent Chromium 0.938
SVOCs
Arsenic 2.69
Barium 62.9
Cadmium 0.148 J
Chromium, Total 32.0
Lead 12.6
Mercury 0.0670
Hexavalent Chromium 0.311 J
Metals
Segment 5
0-4.0 ft BLS
No Compounds Detected
Metals
4.0-8.0 ft BLS
No Compounds Detected
SVOCs
Arsenic 3.17
Barium 139
Cadmium 0.128 J
Chromium, Total 60.9
Lead 14.7
Mercury 0.0461
Hexavalent Chromium 1.23
SVOCs
Arsenic 2.21
Barium 200
Chromium, Total 77.4
Lead 9.59
Mercury 0.0670
Hexavalent Chromium 1.50
Segment 4
0-4.0 ft BLS
No Compounds Detected
Metals
4.0-8.0 ft BLS
No Compounds Detected
Metals
Benzaldehyde 0.141 J
Chrysene 0.0481 J
Fluoranthene 0.0556 J
Naphthalene 0.0666 J
Pentachlorophenol 0.771 J
Phenanthrene 0.0424 J
Pyrene 0.0444 J
Arsenic 2.52
Barium 150
Cadmium 0.178 J
Chromium, Total 36.9
Lead 14.2
Mercury 0.0372
SVOCs Pentachlorophenol 9.70
Arsenic 2.43
Barium 74.7
Chromium, Total 79.1
Lead 7.25
Mercury 0.0832
Hexavalent Chromium 0.849
Segment 3
0-4.0 ft BLS
SVOCs
Metals
4.0-8.0 ft BLS
Metals
Anthracene 0.0499 J
Benzo[a]anthracene 0.0846 J
Benzo[b]fluoranthene 0.131 J
Chrysene 0.132 J
Dibenzofuran 0.0877 J
Fluoranthene 0.273 J
Indeno[1,2,3-cd]pyrene 0.0340 J
Phenanthrene 0.199 J
Pyrene 0.197 J
Arsenic 2.83
Barium 137
Chromium, Total 44.4
Lead 8.95
Mercury 0.0210 J
Hexavalent Chromium 0.563
SVOCs
Barium 176
Cadmium 1.94 J
Chromium, Total 50.8
Lead 12.1
Hexavalent Chromium 1.12
SVOCs
Barium 211
Cadmium 2.11 J
Chromium, Total 70.8
Lead 14.1
Mercury 0.00924 J
Hexavalent Chromium 1.01
Metals
SVOCs
Metals
Segment 2
0-4.0 ft BLS
4.0-8.0 ft BLS Duplicate
4.0-8.0 ft BLS
No Compounds Detected
Metals
No Compounds Detected
SVOCs
Arsenic 2.74
Barium 112
Cadmium 0.145 J
Chromium, Total 27.6
Lead 14.8
Mercury 0.0498
Hexavalent Chromium 0.622
SVOCs
Arsenic 2.97
Barium 112
Cadmium 0.145 J
Chromium, Total 36.6
Lead 14.1
Mercury 0.0559
Hexavalent Chromium 0.358 J
Segment 1
0-4.0 ft BLS
Metals
No Compounds Detected
4.0-8.0 ft BLS
No Compounds Detected
Metals
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Sawmill Hollow Road
US Highw
Fair Haven Drive
Segment 4
Segment 5
Segment 3
Segment 2
Segment 1
SB-06
SB-07
SB-05
SB-04
SB-03
SB-02
SB-01
SB-08
SB-09
SB-10
SG-04
SG-05
SG-03
SG-02
SG-01
SG-08
SG-06
SG-07
SG-09
SG-10
VP-1
VP-3
VP-4
VP-2
VP-5
TW-1
TW-3
TW-2
N:\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\Supplemental Report\Figure 5 Methane Screening Results.mxd 11/8/2022 3:05:04 PM
Sawmill Hollow RoadBurnsville, North Carolina
Methane Screening Results Map
0 50
Feet
³Figure
5Asheville, NC December 2022
Legend
Site Boundary
Former Building
Proposed Community
Center
Proposed Housing Unit
Proposed Road
Sampling Segments
!(Soil Boring Location
!(Soil Gas Sample Location
>Historical Soil Vapor Probe
>Historical Off-Site Soil Vapor
Probe
!>Historical Temporary
Monitoring Well
!>Historical Off-SiteTemporary Monitoring WellNotes:
1. Parcel boundary from Yancey County GIS.2. Methane screening results and initial pressure measurements collected using GEM 5000 ladfill gas meter.3. Initial pressure measurements collected using a Dwyer Series 475-3-FM manometer prior to purging. Methanescreening results collected using a GEM 5000 landfill gas meter.4. Basemap from Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community.
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐01 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐02 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐03 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐04 0.0 1.3
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐05 0.0 5.1
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐06 0.0 1.2
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐07 0.0 0.3
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐08 0.0 0.0
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐09 0.0 0.4
Sample
Location
Static Pressure
("H2O)
Methane
(% volume)
SG‐10 0.0 0.0
!>
!>!>
>
>
>
>
>
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
Sawmill Hollow R
oad
US Highw
Fair Haven Drive
Segment 4
Segment 5
Segment 3
Segment 2
Segment 1
SB-06
SB-07
SB-05
SB-04
SB-03
SB-02
SB-01
SB-08
SB-09
SB-10
SG-04
SG-05
SG-03
SG-02
SG-01
SG-08
SG-06
SG-07
SG-09
SG-10
VP-1
VP-3
VP-4
VP-2
VP-5
TW-1
TW-3
TW-2
N:\N\Northwestern Housing Enterprises\Sawmill Village\7.0 GIS\MXDs\Supplemental Report\Figure 6 Soil Gas Results Map.mxd 12/27/2022 1:03:15 PM
Sawmill Hollow RoadBurnsville, North Carolina
Soil Gas Sampling Results Map
Screening Level Exceedances, PCE, and TCE
0 50
Feet
³Figure
6Asheville, NC December 2022
Legend
Site Boundary
Former Building
Proposed Community
Center
Proposed Housing Unit
Proposed Road
Sampling Segments
!(Soil Boring Location
!(Soil Gas Sample Location
>Historical Soil Vapor Probe
>Historical Off-Site Soil Vapor
Probe
!>Historical Temporary
Monitoring Well
!>Historical Off-Site
Temporary Monitoring WellNotes:
1. Parcel boundary from Yancey County GIS.2. Only presenting results for tetrachloroethene (PCE), trichloroethene (TCE), or compounds with a detection greater than its
respective Residential Vapor Intrusion Screening Level (VISL) in at least one sample.
3. Orange shading indicates compound detected above its Residential VISL.
4. Italics indicates compound was not detected and had a reporting limit above its Residential VISL.5. Laboratory Reporting Limits presented for compounds not detected.
6. NA indicates that VP-2, VP-3, VP-4, and VP-5 were not analyzed for naphthalene.
7. Results are presented in micrograms per cubic meter (µg/m3).
8. Basemap from Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community.
1,3-Butadiene 3.1
Benzene 12
Ethyl Benzene 37
m,p-Xylene 600
Naphthalene 2.8
Tetrachloroethene 280
Trichloroethene 14
Residential SGSL
1,3-Butadiene 2.5 U
Benzene 3.6
Ethyl Benzene 4.9 U
m,p-Xylene 4.9 U
Naphthalene 12 U
Tetrachloroethene 7.6 U
Trichloroethene 6.0 U
9/21/2022
SG-01
1,3-Butadiene 2.5 U
Benzene 3.7
Ethyl Benzene 2.2 J
m,p-Xylene 5.8
Naphthalene 12 U
Tetrachloroethene 7.8 U
Trichloroethene 6.2 U
SG-03
9/21/2022
1,3-Butadiene 3.5 U
Benzene 140
Ethyl Benzene 9.2
m,p-Xylene 21
Naphthalene 3.1 J
Tetrachloroethene 11 U
Trichloroethene 8.4 U
SG-04
9/21/2022
1,3-Butadiene 14 U
Benzene 18 J
Ethyl Benzene 39
m,p-Xylene 41
Naphthalene 65 U
Tetrachloroethene 42 U
Trichloroethene 33 U
9/21/2022
SG-05
1,3-Butadiene 3 U
Benzene 7.0
Ethyl Benzene 2.6 J
m,p-Xylene 8.4
Naphthalene 14 U
Tetrachloroethene 9.3 U
Trichloroethene 6.2 J
1,3-Butadiene 3 U
Benzene 6.9
Ethyl Benzene 2.8 J
m,p-Xylene 7.6
Naphthalene 14 U
Tetrachloroethene 9.2 U
Trichloroethene 2.0 J
SG-06 Duplicate
9/21/2022
SG-06
1,3-Butadiene 2.7 U
Benzene 1.5 J
Ethyl Benzene 5.3 U
m,p-Xylene 2.7 J
Naphthalene 13 U
Tetrachloroethene 8.3 U
Trichloroethene 6.6 U
SG-07
9/21/2022
1,3-Butadiene 2.5 U
Benzene 3.6 U
Ethyl Benzene 4.9 U
m,p-Xylene 4.9 U
Naphthalene 12 U
Tetrachloroethene 7.7 U
Trichloroethene 6.1 U
SG-08
9/21/2022
1,3-Butadiene 2.4 U
Benzene 9.2
Ethyl Benzene 3.5 J
m,p-Xylene 10
Naphthalene 12 U
Tetrachloroethene 3.4 J
Trichloroethene 5.9 U
SG-09
9/21/2022
1,3-Butadiene 2.6 U
Benzene 3.3 J
Ethyl Benzene 2.2 J
m,p-Xylene 5.0 J
Naphthalene 12 U
Tetrachloroethene 7.8 U
Trichloroethene 6.2 U
SG-10
9/21/2022
1,3-Butadiene 0.58
Benzene 14
Ethyl Benzene 22
m,p-Xylene 94
Naphthalene NA
Tetrachloroethene 1.4 U
Trichloroethene 1.1 U
VP-2
12/7/2021
1,3-Butadiene 3.2 U
Benzene 74
Ethyl Benzene 170
m,p-Xylene 880
Naphthalene NA
Tetrachloroethene 1.8 J
Trichloroethene 7.9
VP-3
12/7/2021
1,3-Butadiene 2.3 U
Benzene 53
Ethyl Benzene 130
m,p-Xylene 680
Naphthalene NA
Tetrachloroethene 7.0 U
Trichloroethene 5.6 U
VP-4
12/7/2021
1,3-Butadiene 13
Benzene 74
Ethyl Benzene 67
m,p-Xylene 320
Naphthalene NA
Tetrachloroethene 15 U
Trichloroethene 12 U
VP-5
12/7/2021
1,3-Butadiene 2.6 U
Benzene 3.7 U
Ethyl Benzene 5.0 U
m,p-Xylene 5.0 U
Naphthalene 12 U
Tetrachloroethene 1.7
Trichloroethene 6.3
SG-02
9/21/2022
TABLE 5
SOIL GAS SCREENING RESULTS
SAWMILL VILLAGE
SAWMILL HOLLOW ROAD
BURNSVILLE, NORTH CAROLINA
Soil Gas
Probe ID
Filter Pack
Interval
(ft BLS)
Date Screened Initial Pressure
(inches H2O)(% by volume)
Corresponding
Carbon Dioxide
(% by volume)
Corresponding
Oxygen
(% by volume)
Maximum
VOCs
(ppmv)
SG-01 5 - 6 9/21/2022 0.0 0.0 8.5 12.8 2.9
SG-02 4 - 5 9/21/2022 0.0 0.0 9.2 11.2 2.0
SG-03 7 - 8 9/21/2022 0.0 0.0 4.7 14.1 2.3
SG-04 7 - 8 9/21/2022 0.0 1.3 9.1 12.1 4.7
SG-05 7 - 8 9/21/2022 0.0 5.1 17.3 7.1 4.9
SG-06 7 - 8 9/21/2022 0.0 1.2 9.7 14.3 10.2
SG-07 7 - 8 9/21/2022 0.0 0.3 12.7 10.6 7.9
SG-08 7 - 8 9/21/2022 0.0 0.0 0.0 20.5 3.6
SG-09 7 - 8 9/21/2022 0.0 0.4 4.4 18.7 8.1
SG-10 7 - 8 9/21/2022 0.0 0.0 9.7 12.3 4.1
Notes:
1. Initial pressure measured with a Dwyer Series 475-3-FM manometer.
3. Maximum VOCs corresponds to the maximum PID reading collected during screening.
ft BLS: feet below land surface.
inches H2O: inches of water
%: percent
ppmv: parts per million by volume.
VOCs: volatile organic compounds.
2. Carbon dioxide and oxygen results presented correspond to those measured at the time of the highest methane detection. For locations where no methane was detected, readings from the final purge volume are presented.
1 of 1
TABLE 6
SOIL ANALYTICAL RESULTS
SAWMILL VILLAGE
SAWMILL HOLLOW ROAD
BURNSVILLE, NORTH CAROLINA
Segment
Volatile Organic Compounds (VOCs) by EPA Method 8260D
1,2-Dibromo-3-Chloropropane 96-12-8 0.0056 --mg/kg 0.0141 U 0.01050 U --------0.0103 U 0.00969 U 0.0117 U ------------
2-Butanone (MEK)78-93-3 0.0133 J 0.02620 U --------0.0257 U 0.0105 J 0.0146 J ------------Acetone 67-64-1 0.202 0.02230 J --------0.0440 J 0.0874 0.127 ------------Methyl acetate 79-20-9
0.0499 0.00523 U --------0.00513 U 0.00484 U 0.00583 U ------------
Semivolatile Organic Compounds (SVOCs) by EPA Method 8270E
0.396 U 0.406 U ------------0.385 U 0.395 U 0.388 U
2.04 U 2.09 U ------------1.98 U 2.04 U 2 U
0.0499 J 0.395 U 0.388 U
0.0846 J 0.395 U 0.388 U
0.396 U 0.406 U ------------0.385 U 0.395 U 0.388 U
0.131 J 0.395 U 0.388 U
0.396 U 0.406 U ------------0.385 U 0.395 U 0.388 UChrysene218-01-9 ----0.132 J 0.395 U 0.388 U
0.396 U 0.406 U ------------0.385 U 0.395 U 0.388 U
Dibenzofuran 132-64-9 0.0877 J 0.395 U 0.388 U
0.273 J 0.395 U 0.388 U
0.396 U 0.406 U ------------0.385 U 0.395 U 0.388 U
0.396 U 0.406 U ------------0.385 U 0.395 U 0.388 U
----0.0340 J 0.395 U 0.388 UNaphthalene91-20-3N-Nitrosodi-n-propylamine 621-64-7 0.396 U 0.406 U ------------0.385 U 0.395 U 0.388 UPentachlorophenol87-86-5 2.04 U 2.09 U ------------1.98 U 2.04 U 2 U
Phenanthrene 85-01-8 0.199 J 0.395 U 0.388 U0.197 J 0.395 U 0.388 U
Metals Analysis by EPA Methods 6010D, 7471B, and 7199
Arsenic 7440-38-2 0.68 4.5 mg/kg --------2.74 2.97 ------------2.83 23.8 U 21.7 UBarium7440-39-3 3,100 --mg/kg --------112 112 ------------137 176 211
Cadmium 7440-43-9 1.4 0.1 mg/kg --------0.145 J 0.145 J ------------0.572 U 1.94 J 2.11 J
Chromium, Total 7440-47-3 24,000 0.2 mg/kg --------27.6 36.6 ------------44.4 50.8 70.8Lead7439-92-1 400 4.2 mg/kg --------14.8 14.1 ------------8.95 12.1 14.1Mercury7439-97-6 2.3 --mg/kg --------0.0498 0.0559 ------------0.0210 J 0.0297 U 0.00924 J
Hexavalent Chromium 18540-29-9 0.31 --mg/kg --------0.622 0.358 J ------------0.563 1.12 1.01
Notes:
2. F1 indicates Matrix Spike and/or Matrix Spike Duplicate recovery exceeds control limits.
4. U indicates analyte was not detected above the MDL. RLs are presented for compounds not detected above the MDL.
5. Analyte detections are identified in bold.
6. Analytes not detected above the MDL are grey and the RL for each analyte is presented.
7. Analyte detections that exceed the Residential PSRG are highlighted in orange.
8. Analytes with an RL greater than the respective PSRG are italicized.
9. * indicates duplicate sample.
CAS: Chemical Abstracts Service.
EPA: United States Environmental Protection Agency.
ft BLS: feet below land surface.
mg/kg: milligrams per kilogram.
NC: no criteria.
10. Average values of background metals for North Carolina soils taken from Heavy Metals in North Carolina Soils Occurrence &
Significance by NCDACS, 2008.
Analyte CAS Number Residential
PSRG
Regional Background
Metals in Soil (Average)
1. Results presented include detected compounds and any compound with an RL greater than the respective Residential PSRG.
3. J indicates an estimated concentration above the method detection limit (MDL) and below the reporting limit (RL).
0.0 to 4.0 4.0 to 8.04.0
09/20/2022
4.0 0.0 to 4.0 4.0 to 8.0
09/20/2022*09/20/202209/20/2022
8.0
Segment 2
09/20/2022 09/20/202209/20/2022
Segment 1
09/20/2022*09/20/2022 09/20/2022
7.0
Page 1 of 2
TABLE 6
SOIL ANALYTICAL RESULTS
SAWMILL VILLAGE
SAWMILL HOLLOW ROAD
BURNSVILLE, NORTH CAROLINA
Segment
Volatile Organic Compounds (VOCs) by EPA Method 8260D
1,2-Dibromo-3-Chloropropane 96-12-8 0.0056 --mg/kg2-Butanone (MEK)78-93-3Acetone67-64-1Methyl acetate 79-20-9
Semivolatile Organic Compounds (SVOCs) by EPA Method 8270E
Chrysene 218-01-9
Dibenzofuran 132-64-9
Naphthalene 91-20-3N-Nitrosodi-n-propylamine 621-64-7Pentachlorophenol87-86-5
Phenanthrene 85-01-8
Metals Analysis by EPA Methods 6010D, 7471B, and 7199
Arsenic 7440-38-2 0.68 4.5 mg/kgBarium7440-39-3 3,100 --mg/kg
Cadmium 7440-43-9 1.4 0.1 mg/kgChromium, Total 7440-47-3 24,000 0.2 mg/kgLead7439-92-1 400 4.2 mg/kgMercury7439-97-6 2.3 --mg/kg
Hexavalent Chromium 18540-29-9 0.31 --mg/kg
Notes:
2. F1 indicates Matrix Spike and/or Matrix Spike Duplicate recovery exceeds control limits.
4. U indicates analyte was not detected above the MDL. RLs are presented for compounds not detected above the MDL.
5. Analyte detections are identified in bold.
6. Analytes not detected above the MDL are grey and the RL for each analyte is presented.
7. Analyte detections that exceed the Residential PSRG are highlighted in orange.
8. Analytes with an RL greater than the respective PSRG are italicized.
9. * indicates duplicate sample.
CAS: Chemical Abstracts Service.
EPA: United States Environmental Protection Agency.
ft BLS: feet below land surface.
mg/kg: milligrams per kilogram.
NC: no criteria.
10. Average values of background metals for North Carolina soils taken from Heavy Metals in North Carolina Soils Occurrence &
Significance by NCDACS, 2008.
Analyte CAS Number Residential
PSRG
Regional Background
Metals in Soil (Average)
1. Results presented include detected compounds and any compound with an RL greater than the respective Residential PSRG.
3. J indicates an estimated concentration above the method detection limit (MDL) and below the reporting limit (RL).
0.0168 U 0.0204 U 0.0126 U --------0.00903 U 0.0105 U --------0.00968 U 0.00922 U --------
J 0.0511 U 0.0315 U --------0.0226 U 0.0104 J --------0.0242 U 0.0231 U ----------------0.0369 J 0.0847 --------0.0484 U 0.0461 U --------0.042 U 0.0568 0.0315 U --------0.0337 0.0262 U --------0.0242 U 0.0231 U --------
0.00483 J 0.0102 U 0.0063 U --------0.00452 U 0.00524 U --------0.00484 U 0.00461 U --------
0.427 U 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
2.2 U 2.01 U --------2 U 2.1 U --------1.98 U 1.88 U
0.141 J 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.427 U 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.427 U 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U0.0481 J 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.427 U 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.0556 J 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.427 U 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.427 U 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.0666 J 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U0.427 U 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
0.771 J 9.70 --------2 U 2.1 U --------1.98 U 1.88 U
0.0424 J 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U0.0444 J 0.391 U --------0.388 U 0.407 U --------0.384 U 0.364 U
2.52 2.43 --------3.17 2.21 --------1.34 J 2.6915074.7 --------139 200 --------81.0 62.9
0.178 J 0.559 U --------0.128 J 0.547 U --------0.121 J 0.148 J
36.9 79.1 --------60.9 77.4 --------19.8 F1 32.014.2 7.25 --------14.7 9.59 --------16.0 12.60.0372 0.0832 --------0.0461 0.0670 --------0.0462 0.0670
0.849 --------1.23 1.50 --------0.938 0.311 J
Segment 5
5.0 0.0 to 4.0 4.0 to 8.0 3.0 0.0 to 4.07.0 4.0 to 8.0
Segment 4
5.0 1.0
09/19/202209/19/2022 09/19/202209/19/202209/19/202209/20/2022 09/20/2022 09/19/202209/20/2022 09/20/2022 09/20/2022
0.0 to 4.0 4.0 to 8.0
09/19/202209/19/2022
7.0
Segment 3
2.0
Page 2 of 2
TABLE 7
SOIL GAS ANALYTICAL RESULTS
SAWMILL VILLAGE
SAWMILL HOLLOW ROAD
BURNSVILLE, NORTH CAROLINA
Date Sampled
Units
1,1,2,2-Tetrachloroethane 79-34-5 7.7 U 8.0 U 7.9 U 11 U 42 U 9.4 U 9.3 U 8.4 U 7.8 U 7.6 U 7.9 U 1.4 U 10 U 7.1 U 15 U
1,1,2-Trichloroethane 79-00-5 6.1 U 6.4 U 6.3 U 8.6 U 34 U 7.5 U 7.4 U 6.7 U 6.2 U 6.0 U 6.3 U 1.1 U 8.0 U 5.7 U 12 U
1,2,4-Trichlorobenzene 120-82-1 33 U 34 U 34 U 47 U 180 U 41 U 40 U 36 U 34 U 33 U 34 U 7.4 U 54 U 38 U 82 U
1,2,4-Trimethylbenzene 95-63-6 4.6 J 30 U 3.5 J 3.2 J 6.0 U 5.6 U 2.6 J 5.7 U 3.5 150 100 84
1,2-Dibromoethane (EDB)106-93-4 8.6 U 9.0 U 8.8 U 12 U 48 U 10 U 10 U 9.4 U 8.7 U 8.5 U 8.9 U 1.5 U 11 U 8.0 U 17 U
1,2-Dichloroethane 107-06-2 4.5 U 4.7 U 4.6 U 6.4 U 25 U 5.6 U 5.5 U 5.0 U 4.6 U 4.5 U 4.7 U 0.81 U 5.9 U 4.2 U 9.0 U
1,2-Dichloropropane 78-87-5 29 U 6.4 U 6.3 U 5.7 U 5.2 U 5.1 U 5.3 U 0.93 U 6.8 U 4.8 U 10 U
1,3,5-Trimethylbenzene 108-67-8 1.2 37 27 24
1,3-Butadiene 106-99-0 3.5 U 14 U 3.0 U 3.0 U 2.7 U 2.5 U 2.4 U 2.6 U 0.58 3.2 U 2.3 U 13
1,4-Dichlorobenzene 106-46-7 9.4 U 37 U 8.3 U 8.2 U 7.4 U 6.8 U 6.6 U 6.9 U 1.2 U 8.8 U 6.2 U 13 U
1,4-Dioxane 123-91-1 23 U 89 U 20 U 20 U 18 U 16 U 16 U 17 U 0.35 J 5.3 U 3.7 U 8.0 U
2,2,4-Trimethylpentane 540-84-1 1,700 1,700 5.5 J 5.3 U 9.9 180 22 180 84 2000
2-Butanone (Methyl Ethyl Ketone)78-93-3 9.4 J 5.9 J 4.6 J 23 57 J 7.1 J 6.8 J 13 J 4.4 J 5.3 J 8.9 J 0.65 J 22 U 15 U 2.9 J
2-Propanol 67-63-0 13 5.9 J 16 48 J 7.1 J 6.3 J 12 U 11 U 6.3 J 9.0 J 7.0 J 7.4 J 7.6 J 9.8 J
3-Chloropropene 107-05-1 14 U 14 U 14 U 20 U 78 U 17 U 17 U 15 U 14 U 14 U 14 U 3.1 U 23 U 16 U 35 U
4-Ethyltoluene 622-96-8 1.8 J 4.3 J 30 U 2.0 J 1.9 J 6.0 U 5.6 U 2.0 J 1.6 J 8.0 170 110 86
4-Methyl-2-pentanone 108-10-1 4.1 J 7.8 J 5.6 U 5.6 U 5.0 U 4.6 U 4.5 U 1.1 J 0.82 U 6.0 U 4.3 U 9.1 U
Acetone 67-64-1 19 J 33 28 150 520 40 36 36 23 J 24 J 51 12 53 J 10 J 24 J
alpha-Chlorotoluene 100-44-7 5.8 U 6.0 U 6.0 U 8.1 U 32 U 7.1 U 7.0 U 6.4 U 5.9 U 5.7 U 6.0 U 1.0 U 7.6 U 5.4 U 11 U
Benzene 71-43-2 3.6 3.7 U 3.7 140 18 J 7.0 6.9 1.5 J 3.6 U 9.2 3.3 J 14 74 53 74
Bromodichloromethane 75-27-4 7.5 U 7.8 U 7.7 U 10 U 42 U 9.2 U 9.1 U 8.2 U 7.6 U 7.4 U 7.7 U 1.3 U 9.8 U 7.0 U 15 U
Bromomethane 74-83-9 43 U 45 U 45 U 61 U 240 U 53 U 53 U 48 U 44 U 43 U 45 U 7.8 U 57 U 40 U 9.9 J
Carbon Disulfide 75-15-0 13 J 14 U 26 48 77 U 18 11 J 19 11 J 180 26 1.9 J 7.2 J 16 U 12 J
Carbon Tetrachloride 56-23-5 39 U 8.6 U 8.6 U 7.7 U 7.1 U 7.0 U 7.3 U 0.44 J 9.2 U 6.5 U 14 U
Chloroform 67-66-3 5.5 U 0.91 J 5.6 U 7.7 U 30 U 6.7 U 6.6 U 3.7 J 5.5 U 5.4 U 5.6 U 0.56 J 6.8 J 4.9 J 11 U
Chloromethane 74-87-3 0.51 J 15 U 11 U 23 U
cis-1,2-Dichloroethene 156-59-2 2.8 J 5.4 U 4.9 U 4.5 U 4.4 U 4.6 U 0.8 U 5.8 U 4.1 U 8.8 U
Cumene 98-82-8 1.4 11 7.4 11 U
Cyclohexane 110-82-7 4.4 J 21 U 12 12 4.2 U 3.9 U 4.4 1.2 J 0.25 J 1.6 J 18 U 28 J
Ethanol 64-17-5 12 J 22 U 96 120 U 26 U 26 U 23 U 21 U 21 U 22 U 69 8.3 J 9.7 J 16 J
Ethyl Benzene 100-41-4 2.2 J 9.2 39 2.6 J 2.8 J 5.3 U 4.9 U 3.5 J 2.2 J 22 170 130 67
Freon 11 75-69-4 1.4 J 1.3 J 1.4 J 8.8 U 35 U 7.7 U 7.6 U 6.9 U 6.4 U 1.8 J 6.5 U 1.2 1.9 J 2.7 J 3.2 J
Freon 113 76-13-1 0.44 J 11 U 8 U 17 U
Freon 12 75-71-8 2.9 J 2.6 J 2.7 J 7.8 U 31 U 6.8 U 6.7 U 1.6 J 2.6 J 3.4 J 1.6 J 2.5 J 2.5 J 2.5 J 55 U
Heptane 142-82-5 4.9 4.8 U 3.2 J 35 41 5.6 U 5.6 U 3.2 J 4.6 U 20 2.9 J 8.7 59 21 78
Hexachlorobutadiene 87-68-3 48 U 50 U 49 U 67 U 260 U 59 U 58 U 52 U 48 U 47 U 49 U 11 U 78 U 55 U 120 U
Hexane 110-54-3 8.8 4.1 U 2.4 J 46 34 12 11 11 4.0 U 36 3.9 J 3.5 9.0 J 2.1 J 36 J
m,p-Xylene 108-38-3 5.8 21 41 8.4 7.6 2.7 J 4.9 U 10 5.0 J 94 880 680 320
Methylene Chloride 75-09-2 8.1 J 5.3 J 220 U 48 U 47 U 43 U 39 U 38 U 12 J 1.4 U 10 U 7.2 U 15 U
Naphthalene 91-20-3 12 U 12 U 12 U 3.1 J 65 U 14 U 14 U 13 U 12 U 12 U 12 U NA NA NA NA
o-Xylene 95-47-6 2.1 J 6.1 J 14 J 4.4 J 5.1 J 1.0 J 4.9 U 3.0 J 1.5 J 16 220 160 80
Propylbenzene 103-65-1 25 J 6.8 U 6.7 U 6.0 U 5.6 U 5.4 U 5.7 U 2.3 30 19 16
Styrene 100-42-5 2.1 J 7.4 J 5.8 U 5.8 U 5.2 U 4.8 U 4.7 U 4.9 U 0.86 U 6.3 U 4.4 U 9.4 U
Tetrachloroethene 127-18-4 1.7 J 7.8 U 11 U 42 U 9.3 U 9.2 U 8.3 U 7.7 U 3.4 J 7.8 U 1.4 U 1.8 J 7 U 15 U
Tetrahydrofuran 109-99-9 4.3 5.2 3.6 U 3.3 U 3.2 U 3.4 U 3 U 22 U 15 U 33 U
Toluene 108-88-3 4.4 4.4 U 12 130 20 J 11 12 6.7 1.0 J 34 12 220 1500 1100 620
Trichloroethene 79-01-6 33 U 6.2 J 2.0 J 6.6 U 6.1 U 5.9 U 6.2 U 1.1 U 7.9 5.6 U 12 U
Vinyl Chloride 75-01-4 16 U 3.5 U 3.5 U 3.1 U 2.9 U 2.8 U 3.0 U 0.51 U 3.8 U 2.6 U 5.7 U
Notes:
2. J indicates an estimated concentration above the method detection limit (MDL) and below the reporting limit (RL).
3. U indicates analyte was not detected above the MDL. RLs are presented for compounds not detected above the MDL.
4. * indicates duplicate sample.
5. Analyte detections are identified in bold.
6. Analytes not detected above the MDL are grey and the RL for each analyte is presented.
7. Analyte detections that also exceed the Residential VISL are highlighted in orange.
8. Analyte detections that also exceed the Non-Residential VISL are highlighted in red.
9. Analytes with an RL greater than the respective VISL are italicized.
10. Sample locations VP-2 through VP-5 were sampled by WithersRavenel in December 2021.
CAS: Chemical Abstracts Service.
EPA: United States Environmental Protection Agency.
NC: no criteria.
NA: not analyzed.
µg/m3: micrograms per cubic meter.
VP-2 VP-3 VP-4 VP-5
09/21/2022 09/21/2022
Volatile Organic Compounds (VOCs) by EPA Method TO-15
12/07/2021 12/07/2021 12/07/2021 12/07/202109/21/2022 09/21/2022*09/21/2022
VISL: North Carolina Department of Environmental Quality (NCDEQ) Sub-slab and Exterior Soil Gas Residential and Non-Residential Vapor Intrusion Screening Levels (VISLs), amended July 2022.
SG-08
Analyte CAS Number Residential
VISL 09/21/202209/21/2022 09/21/2022 09/21/2022 09/21/2022 09/21/2022
Page 1 of 1

APPENDIX G

Example VIMS O&M Forms
Site: Project No.:
Field Personnel: Date:
Recorded By: Weather:
Building Address: Equipment:
Monitoring Probe ID
Date
Time
Differential Pressure (Pa)
Monitoring Probe ID
Date
Time
Differential Pressure (Pa)
Other Observations:
EXAMPLE: VIMS - Monitoring Probe Measurements
Subslab Monitoring Probe
Subslab Monitoring Probe
Site: Project No.:
Field Personnel: Recorded By:Date:
Extraction
Pipe ID Date Time
Operational On
Arrival?
(Y/N)
Velocity
(ft/min)
Calculated
Flow Rate
(scfm)
Static Vacuum
(Pa/in H2O)Comment
Overall Comments: (non-routine maintenance, observations, problems, etc.)
EXAMPLE: VIMS - Extraction Riser Measurements
Vent Risers