25071_Patterson Ave_VIMS Design Plan Rev 2 and BRS Review Letter_20230405

April 5, 2023
Sent via Email

John R. Maas, PG and Thomas M. Baglivo, PE
GeoHydro Engineers, Inc. 2748 Interstate Steet, Suite A Charlotte, NC 28208 [e-mail]
[e-mail]
Subject: Passive Vapor Intrusion Mitigation System Design and Specification Plan – Revision 2
Patterson Avenue/Two Cities Church
Winston-Salem, Forsyth County Brownfields Project # 25071-21-034 Dear Mr. Maas and Mr. Baglivo:

The North Carolina Department of Environmental Quality’s Brownfields Redevelopment Section (DEQ Brownfields) received and reviewed the Passive Vapor Intrusion Mitigation System Design and Specification Plan – Revision 2 (VIMS Plan), dated April 5, 2023, for the above referenced Brownfields Property. DEQ Brownfields has found the VIMS Plan to satisfy
elements of the Land Use Restrictions of the pending Brownfields Agreement for design of a
vapor mitigation system, and as such, this letter constitutes DEQ approval of the VIMS Plan. As will be expressed in the Brownfields Agreement for this project, an essential component of public health protection for this design is the professional engineer’s seal of these
documents that the proposed design will be effective at mitigating the potential for vapor intrusion at the property and protecting public health. As a reminder, DEQ Brownfields is to be provided with timely notifications specified in the VIMS Plan. DEQ Brownfields reserves the authority to require confirmation of efficacy in the future.
Be advised that this review from DEQ Brownfields does not waive any applicable
requirement to obtain any necessary permits, licenses or certifications for the above listed activities nor does it waive any requirement to comply with applicable law for such activities.

John Maas and Thomas Baglivo April 5, 2023 Page 2

If you have questions about this correspondence or require additional information, please
contact me by phone at [phone], or e-mail at [e-mail].
Sincerely,
Peter L. Doorn Brownfields Project Manager
ec: David Vogel, Two Cities Church, Inc.
Kyle Mercer, Two Cities Church, Inc. Rick Reich, Kilpatrick Townsend Steve Berlin, Kilpatrick Townsend Ed Craver, Landmark Builders
Tracy Wahl, DEQ Brownfields
Kelly Johnson, DEQ Brownfields Jordan Thompson, DEQ Brownfields Sarah Hardison Young, DEQ Brownfields Kevin Slaughter, DEQ Brownfields

2748 Interstate Street, Suite A • Charlotte, North Carolina
o: 704.837.7174 • www.geohydro.com

Mr. Peter Doorn
Brownfields Project Manager April 5, 2023
North Carolina Department of Environmental Quality
Division of Waste Management, Brownfields Section
1646 Mail Service Center
Raleigh, North Carolina 27603

Passive Vapor Intrusion Mitigation System (VIMS) Design and Specification Plan
Patterson Avenue Property
N. Patterson Avenue, Ivy Avenue, and E. Tenth Street
Winston-Salem, Forsyth County, North Carolina
Brownfields Project ID: 25071-21-034
Geo-Hydro Project Number 221862.30
Revision 2

Mr. Doorn:

Geo-Hydro Engineers, Inc. (Geo-Hydro) has completed this Passive Vapor Intrusion Mitigation System
(VIMS) design and specification plan on behalf of Two Cities Church, Inc. (Prospective Developer) at the
above-referenced location. The VIMS was recommended as an engineering control to mitigate VI risk from
previously identified environmental conditions associated with the subject property. This design package
provides background information for the site and an overview of the system design along with design
specifications for the VIMS. Previous versions of this Passive VIMS Design and Specification Plan were
submitted October 3, 2023 and March 24, 2023. This revised version incorporates comments received from
the North Carolina Department of Environmental Quality (NCDEQ) Brownfields Program.

Geo-Hydro has appreciated the opportunity to provide our environmental consulting services. If you have
any questions about this report, or if we can be of further assistance, please contact us.

Sincerely,

GEO-HYDRO ENGINEERS, INC.

John R. Maas, P.G. Thomas M. Baglivo, P.E.
NC Environmental Manager NC Operations Manager
[e-mail] [e-mail]

cc: Mr. David Vogel – Two Cities Church, Inc. ([e-mail])

JRM/TMB/25071_Patterson Ave_VIMS Design_20230405
4/5/23

Passive Vapor Intrusion Mitigation System (VIMS)
Design and Specification Plan
Revision 2
Brownfields Project ID: 25071-21-034
Patterson Avenue Property
N. Patterson Avenue, Ivy Avenue, and E. Tenth Street
Winston-Salem, Forsyth County, North Carolina
Geo-Hydro Project Number 221862.30

Prepared For: Two Cities Church, Inc.
April 5, 2023
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 2
TABLE OF CONTENTS

Sincerely, .................................................................................................................................... i
TABLE OF CONTENTS ............................................................................................................. ii
APPENDICES ................................................................................................................................ iii
1 INTRODUCTION ................................................................................................................ 4
1.1 GENERAL INFORMATION AND COMMUNICATIONS .......................................................... 4
1.2 INTRODUCTION ........................................................................................ 4
1.3 VIMS DESIGN OVERVIEW .............................................................................. 5
1.4 QUALIFICATIONS AND LIMITATIONS ...................................................................... 6
1.5 CERTIFICATION ........................................................................................ 7
2 DESIGN BASIS .................................................................................................................. 8
2.1 ELEMENTS OF THE PASSIVE VIMS DESIGN ............................................................... 8
2.2 SUBGRADE SURFACE PREPARATION..................................................................... 9
2.3 SUB-SLAB SOIL GAS COLLECTION SYSTEM INSTALLATION ................................................. 9
2.4 VAPORBLOCK® PLUS 20™ SUB-SLAB IMPERMEABLE VAPOR BARRIER INSTALLATION ...................... 10
2.5 VENT RISERS ....................................................................................... 10
2.6 VENTILATORS AND EXHAUST FANS .................................................................... 11
2.7 MONITORING POINTS ................................................................................ 11
3 QUALITY ASSURANCE/QUALITY CONTROL ........................................................................ 12
3.1 VIMS INSTALLATION MONITORING AND INSPECTION ..................................................... 12
4 POST-CONSTRUCTION / PRE-OCCUPANCY EFFECTIVENESS TESTING ................................... 12
4.1 VIMS INFLUENCE TESTING ........................................................................... 12
4.2 POST-CONSTRUCTION/ PRE-OCCUPANCY SUB-SLAB SOIL GAS SAMPLING ................................ 13
4.3 POST-CONSTRUCTION/ PRE-OCCUPANCY INDOOR AIR SAMPLING ........................................ 14
4.4 VIMS EFFECTIVENESS TESTING REPORTING AND CONTINGENCY FOR CONVERSION TO ACTIVE VIMS ....... 14
4.5 FUTURE SLAB MODIFICATIONS, POUR BACK, AND SYSTEM PROTECTION .................................. 14
5 POST-OCCUPANCY EFFECTIVENESS TESTING ................................................................... 15
6 FUTURE TENANTS & BUILDING USES ................................................................................ 15
7 REPORTING ................................................................................................................... 16

Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30
April 5, 2023 │ iii
APPENDICES

APPENDIX 1 NCDEQ Brownfields Program VIMS Design Submittal Requirements – March 2022

APPENDIX 2 Figures
Figure 1 - Site Location Map
Figure 2 - Sample Location Plan
Figure 3 – Site Potentiometric Map
Figure 4A – Soil Analytical Results Map
Figure 4B – Groundwater Analytical Results Map
Figure 4C – Soil Gas Analytical Results Map
Figure 5 – Proposed Development Plan
Figure 6 - Receptor Survey Map

APPENDIX 3 Tables
Table 1 - Summary of Temporary Monitoring Well Construction and Groundwater Elevation Data
Table 2 - Summary of Soil Analytical Results
Table 3 - Summary of Groundwater Analytical Results
Table 4 - Summary of Sub-Slab Soil Gas Analytical Results
Table 5 - Summary of Exterior Soil Gas Analytical Results

APPENDIX 4 VIMS Design Drawings and General Specifications (Figures V1-V6)

APPENDIX 5 VIMS Product Specifications

REFERENCES

Division of Waste Management (March 2018, Version 2) - “Vapor Intrusion Guidance”
Note: this document also contains in Appendix H the “Brownfields Program Vapor Intrusion
Mitigation System (VIMS) Design Submittal New Construction Minimum Requirements Checklist”
https://deq.nc.gov/about/divisions/waste-management/waste-management-permit-guidance/dwm-
vapor-intrusion-guidance

ITRC Guidance Website - “Technical Resources for Vapor Intrusion Mitigation”
https://www.itrcweb.org/Guidance/ListDocuments?topicID=28&subTopicID=39

ANSI/AARST CC-1000, “Soil Gas Control Systems in New Construction of Buildings”.
Note: CC-1000 includes companion guidance that is not part of the ANSI/AARST American National
Standard Institute (ANSI), and may contain material that has not been subjected to public review or
a consensus process.
https://standards.aarst.org/CC-1000-2018/4/

Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 4
1 INTRODUCTION

1.1 General information and Communications

Brownfields Assigned Project Name: Patterson Avenue Property

Brownfields Project Number: 25071-21-034

Brownfields Property Address: Parcel numbers and street addresses as listed on the June 22,
2022, North Carolina Brownfields Program Supplemental Affidavit Re: Responsibility and
Compliance:
6836-30-2595, 1111 N. Patterson Ave., Winston-Salem, Forsyth County, NC
6836-30-6435, 0 Ivy Ave., Winston-Salem, Forsyth County, NC
6836-30-6484, 0 Ivy Ave., Winston-Salem, Forsyth County, NC
6836-30-2137, 1001 N. Patterson Ave., Winston-Salem, Forsyth County, NC
6836-30-4546, 0 N. Patterson Ave., Winston-Salem, Forsyth County, NC
6836-30-5485, 0 Ivy Ave., Winston-Salem, Forsyth County, NC
6836-30-7279, 0 E. Tenth St., Winston-Salem, Forsyth County, NC
6836-30-9312, 0 Ivy Ave., Winston-Salem, Forsyth County, NC
6836-30-9218, 1014 Ivy Ave., Winston-Salem, Forsyth County, NC
6836-30-9215, 0 Ivy Ave., Winston-Salem, Forsyth County, NC
6836-30-9119, 0 Ivy Ave., Winston-Salem, Forsyth County, NC

Brownfields Property Area (acres): 9.31

Prospective Developer (PD): Two Cities Church, Inc.
Contact Person: David Vogel
Phone Number: 865-789-0816
Email: [e-mail]

VIMS Installation Contractor for PD: Landmark Builders, Inc.
Contact Person: Tim Carper
Phone Number: 336-784-2000
Email: [e-mail]

Environmental Consultant: Geo-Hydro Engineers, Inc.
Contact Person: John Maas, P.G
Phone Number: 704-340-6087
Email: [e-mail]

Brownfields Program Project Manager: Peter Doorn
Phone Number: 984-275-5391
Email: [e-mail]

1.2 Introduction
The subject property is located within the boundaries of N. Patterson Avenue, Ivy Avenue, and E.
Tenth Street consists of eleven parcels. Land-use in the area is primarily commercial and industrial.
The project site has received a Letter of Eligibility (LOE) dated January 14, 2022 for the North
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 5
Carolina Department of Environmental Quality Brownfields Program (NCDEQ BP) with the site ID
No. 25071-21-034.

The most recent Phase 1 (Progress, 2021) identified several recognized environmental concerns
(RECs) associated with the project site. The potential for impact to the subject site was identified
from undocumented releases originating from a former dry-cleaning facility located on an adjacent
property east of the site as well as from automotive service and repair facilities south and east of the
site. A documented groundwater contaminant plume originating from unknown sources in the
vicinity of the site was also identified.

The site is intended to be redeveloped as a church. It is Geo-Hydro’s understanding that construction
activities are currently under way. There will be one 47,485 square feet building with approximately
30,000 square feet total of ground level floors in the south central portion of the site. The building
will be split-level, with the northern section of the building (approximately 11,000 square feet) 15
feet lower in elevation than the southern 19,000 square feet main sanctuary area. The two sections
will be divided by a 15 feet high concrete poured in place retaining wall that will be in contact with
site soils (see Appendix 4 Figures V1 and V2). A 3 feet high concrete masonry unit (CMU) retaining
wall will be located between the elevated stage area and main sanctuary floor and will be in contact
with compacted structural fill site soils. An overview of the proposed building’s structural
components including thickened footers, retaining walls in contact with soils, and other components
is presented in Appendix 4, Figures V2 and V3. The remainder of the site will be impervious surface
paved parking areas and pervious landscaping. Figure 5 in Appendix 2 presents the proposed
development plan.

As summarized in Appendices 2 and 3, assessment activities at the site indicate the groundwater to
indoor air risk at the site exceeds the residential and non-residential risk thresholds. Concentrations
of petroleum (i.e., benzene, naphthalene) and chlorinated solvent (i.e., tetrachloroethylene,
trichloroethylene) related compounds exceeding applicable standards and risk screening levels were
identified in groundwater in the northern area of the site. The installation of a Passive Vapor Intrusion
Mitigation System (VIMS) has been recommended as an engineering control to mitigate VI risk.

This VIMS design plan was prepared following Geo-Hydro’s proposal (Geo Hydro proposal dated
August 11, 2022) in general accordance with the NCDEQ Brownfields Program March 2022 VIMS
Design Submittal Requirements. A copy of these requirements is included in Appendix 1.

Geo-Hydro was contracted by Two Cities Church, Inc. to prepare a design for a VIMS at the site.
This design package includes a report providing background information for the site and an overview
of the system design along with design specifications for the VIMS which are detailed in the
Appendices.

1.3 VIMS Design Overview
In order to develop the VIMS for the site, we have reviewed site redevelopment plans and the above
referenced environmental reports, as well as corresponding with Two Cities Church, Inc., and their
redevelopment general contractor, Landmark Builders, during the process. After reviewing the
proposed design documents and site environmental assessment data, Geo-Hydro opted to use Raven’s
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 6
VaporBlock® Plus 20™ (VBP20) sub-slab vapor intrusion barrier combined with a passive sub-slab
depressurization system. Ventilation fans are not proposed to be connected to the vent riser exhaust
piping on the roof to create an active ventilating system at this time.

The passive sub-slab depressurization system consists of horizontal runs of slotted 3-inch diameter
PVC piping as a sub-slab vapor collection system. The horizontal PVC pipe will be connected to
vertical risers constructed of solid 3-inch dimeter schedule 40 PVC pipe. The VIMS will be installed
across the entire footprint of the church beneath the floor slab (approximately 30,000 total square
feet) with vent risers extending from the sub-slab to the roof (as described in Section 2 and shown in
Appendix 2). This vims design plan is intended to protect all enclosed spaces within the subject
building.

1.4 Qualifications and Limitations

The scope of the recommendations in this VIMS design plan is expressly limited to the type of
structures described and detailed in the VIMS design plan. Geo-Hydro’s recommendations in this
VIMS design plan are based upon the information available to Geo-Hydro at this time. These
recommendations should not be assumed to be sufficient for activities beyond the described types of
structures or with respect to conditions, materials, or types of structures not described herein. If
additional information concerning the site conditions becomes available or other additional activities
are contemplated with respect to the materials on or development of the site, the conclusions and
recommendations in this VIMS design plan may not be adequate and should not be considered
accurate unless the additional information or activities are reviewed and the recommendations are
modified, if necessary, and approved in writing by Geo-Hydro.

This VIMS Design is subject to compliance review by the NCDEQ Brownfields Program. Minor
modifications to the design (e.g., use of equivalent products/materials, minor modifications to system
component locations) will be approved by the engineer and documented in as-built drawings (Section
7.0). Design elements may be moved within a certain tolerance zone to avoid structural elements (i.e.,
column footers) or to place monitoring points in more discrete or accessible locations. The tolerance
zone for design element and monitoring points movement will be +/- 5 feet. NCDEQ will promptly
be consulted if movements of the design elements or monitoring points further than the tolerance
zone occur. Significant alterations to the VIMS Design (e.g., changes to the areas to receive
mitigation, the number of risers, or the number of monitoring points) will be submitted to the NCDEQ
Brownfields Program in a VIMS Design Report Addendum for compliance review.

Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 7

1.5 Certification
The VIMS detailed herein is designed to mitigate intrusion of subsurface vapors into the subject
building from known Brownfields Property contaminants in a manner that is in accordance with the
most recent and applicable guidelines including, but not limited to, 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.
The sealing professional engineer below is satisfied that the design is fully protective of public health
from known Brownfields Property contaminants.

_____________________________________
Printed Name of Registered Professional Engineer

_____________________________________
Signature of Registered Professional Engineer

Date________________________ Registration No. ______________ State NC

4/5/23
Thomas M. Baglivo, P.E.
4/5/23 044669
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 8

2 DESIGN BASIS

2.1 Elements of the Passive VIMS Design
This report documents the design basis, design, planned installation and quality assurance/quality
control program, and post-construction/pre-occupancy testing and reporting for the passive VIMS.
Elements of the passive VIMS design include the following:
• Initial preparation
• VIMS installation
• Vent riser locations
• Roof top ducting
• Sealing requirements
• Figures identifying the location and layout of the vapor barrier, sub-slab depressurization
system, and typical cross sections of the vapor tie-ins to major foundation structural
components
• Specification details for VIMS installation procedures
• QA/QC oversight/inspection procedures
• Post-construction/pre-occupancy testing and reporting

This document has been prepared as a summary of the VIMS design elements. Included in the
Appendices to this document are design specifications for the VIMS system layout, installation
instructions, and manufacturer information detailing the VPB20 sub-slab vapor intrusion barrier and
passive sub-slab depressurization system. Figures, including drawing details of the VIMS system
components, were prepared from site plans and drawings provided by others. The appropriate
structural, foundation, and mechanical, electrical, and plumbing (MEP) plans should be referred to
for the VIMS installation.

Utility plans were examined to review locations of planned subsurface utilities in relation to the
proposed site building and areas of identified contamination. As discussed in Section 1.2,
concentrations of petroleum (i.e. benzene, naphthalene) and chlorinated solvent (i.e.
tetrachloroethylene, trichloroethylene) related compounds exceeding applicable standards and risk
screening levels were identified in groundwater in the northern “green space” area of the site (TMW-
3). The footprint of the proposed church building is over 250 feet south-southwest and hydraulically
cross-gradient from the temporary groundwater monitoring well TMW-3 location, such that the
groundwater is interpreted to flow from the TMW-3 area northwest and away from the footprint of
the proposed church building. Water lines will run to the proposed church building from the south
(East 10th Street) and West (Patterson Avenue). Sanitary and storm sewer pipes are planned to be
placed between the proposed church building and green space area of identified groundwater
contamination, running southeast to northwest approximately along the main driveway. No utilities
are proposed to be installed within the proposed green space of identified groundwater contamination.
Based on the planned locations and distance of subsurface utilities in relation to the area of identified
groundwater contamination and footprint of the proposed church building, it is Geo-Hydro’s opinion
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 9
that trench dams to restrict vapor migration along these pathways are not needed as a part of this
VIMS design.

This document has been prepared to detail a design that incorporates current industry standards that
will effectively mitigate potential hazardous vapor intrusion to the satisfaction of the NCDEQ. The
installation is to occur during construction activities prior to installation of the slab foundation.

2.2 Subgrade Surface Preparation
The subgrade surface shall consist of a gravel layer. The gravel layer provides a porous layer beneath
the gas barrier to allow for increased transport of gases from beneath the building. The slotted PVC
collection system will be installed within the gravel layer. Subgrade details are summarized below.

• The gravel layer will consist of a crushed stone material that will support the concrete slab
while allowing vapor to freely flow through the material to the suction point piping collection
system. Ideally a ¾” minus gravel/ #57 stone layer with rounded edges should be specified;
however, the proposed system can accommodate a wide variety of different permeable
substrates.
• The gravel layer shall be a minimum of 4-inches thick and be compacted, rolled flat, and
meet the requirements for the building design.

2.3 Sub-Slab Soil Gas Collection System Installation
The slotted PVC soil gas collection system is laid within the subgrade gravel layer and connected to
the evacuation system to evacuate soil vapors from beneath the building footprint. Installation details
are summarized below.

• The collection system has a typical effective radius of 25 feet; therefore, each horizonal
collection run can be placed up to 50 feet on-centers. The layout of the soil gas collection
system is shown in Appendix 4.
• The collection system will be installed within the subgrade gravel layer below the VPB20
vapor barrier.
• The collection system will be composed of slotted three-inch minimum Schedule 40 PVC
pipe.
• The slotted PVC pipe will be connected to solid 3-inch minimum Schedule 40 PVC pipe vent
risers that extend through the roof as shown in Appendix 4.
• Solid piping will be sloped to allow drainage of water buildup toward the collection system.
Vent riser manifold piping will not be lower in grade than the horizontal slotted PVC
collection system.
• Solid 3-inch minimum Schedule 40 PVC Solid pipe within a protective pipe sleeve will be
used for portions of the collection system penetrating through areas of thickened slab (i.e.,
near columns, stadium seating in sanctuary).
• Slotted PVC collection piping details are shown in Appendix 5.

Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 10
2.4 VaporBlock® Plus 20™ Sub-slab Impermeable Vapor Barrier Installation
The proposed VBP20 sub-slab impermeable vapor barrier system will be installed beneath the slab
of church building at the site. The VBP sub-slab vapor barrier system will provide a gas restrictive
layer to prevent VOC vapors not collected by the slotted PVC system from entering the building.
VPB20 is a seven-layer co-extruded barrier made using high quality virgin-grade polyethylene and
ethylene vinyl alcohol copolymer (EVOH) resins to provide impact strength as well as resistance to
soil gas and moisture transmission. According to the manufacturer, Raven, VPB20 is more than 100
times less permeable than typical high-performance polyethylene vapor retarders against VOCs.
VPB20 20 multi-layer gas barrier has been tested to exceed ASTM E-1745 (Plastic Water Vapor
Retarders Used in Contact with Soil or Granular Fill Under Concrete Slabs) Class A, B, and C
requirements. VPB20 consists of a 20 mil thick barrier installed with Butyl Seal 2-sided tape at the
barrier overlap and 1-sided seaming tape at the seams.
VPB20 sub-slab impermeable vapor barrier system details are summarized below.
• The VPB20 vapor barrier will be installed below the building slab surrounded by the inner
face of the exterior footings.
• A gas-tight seal must be provided where the VPB20 vapor barrier is attached to all exterior
wall footings using the manufacturer’s recommendations. The VPB20 vapor barrier will be
installed around sides of pile caps and caisson caps.
• Gas-tight seals are needed at all pipe or conduit penetrations through the barrier. This
includes, but is not limited to, all water lines, sanitary sewer pipes, electrical conduits, and
any other materials that penetrate the barrier. The manufacturer recommended sealing agents
(seam/repair tape, pourable sealant) will be used at all pipe or conduit penetrations through
the vapor barrier.
• The VBP20 layer will be placed over the subgrade in one direction with minimum 12-inch
overlaps which will be sealed in-between with a 2-sided tape and then sealed with a 1-sided
tape centered on the overlap seam per manufacturer’s recommendations.
• The vapor liner will be installed around sub-grade vertical retaining walls and elevator pits.
Exterior ground surface elevation is planned to be at or below horizontal sub-slab vapor
barrier elevation with the exception of sub-grade vertical retaining walls.
• If the VBP20 layer is damaged prior to the concrete slab pour, a patch will be installed using
a piece of VBP20 cut with a minimum of 6-inches of patch surrounding the damaged area.
The patch seams will be sealed using the manufacturer recommended tape.
• VBP20 details are shown in Appendix 4.

2.5 Vent Risers
The horizontal soil gas collection system will be connected to a total of twelve, 3-inch minimum
diameter solid Schedule 40 PVC vertical risers. Each vertical riser is estimated to have a capacity to
accommodate sub-slab depressurization of up to 5,000 square feet of sub-slab area, so the venting
system will be more than adequate to cover the approximate 30,000 total square feet of the building
footprint. The northern 11,000 square feet section of the church will have four vertical risers, and the
southern 19,000 square feet sanctuary section will have eight vertical risers.

Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 11
• The slotted three-inch minimum Schedule 40 PVC gas collection system will be connected
to solid vertical vent risers.
• Vent risers will be properly secured to the interior of the building (e.g., enclosed within wall
cavities or pipe chases) to protect from damage and extend at least 18-inches above the roof.
• Each vent riser exhaust point shall be at least ten feet away from any opening into conditioned
spaces of the building that is less than two feet below the exhaust point.
• There should be at least one vent riser per every 5,000-square feet of building footprint.
• The locations of the vent risers for each building are shown on Appendix 4.
• All vent risers must be routed within the thermal envelope of the building to ensure the
venting system functions properly.
• Vent riser piping will be 3-inch minimum diameter and consist of Schedule 40 PVC pipe or
equivalent.

Care should be taken to limit horizontal to near horizontal runs within the vent risers, and limit the
number of fittings, other than couplings, within runs. In addition to terminating 12-inches above the
roof, terminations of vent riser should also allow adequate room for the installation of an exhaust fan
in the event the system is converted to an active system.

2.6 Ventilators and Exhaust Fans
To assist the passive VIMS, a stainless steel stationary ventilator will be installed on the exhaust end
of the vertical riser piping. If the system is later converted to active exhausting, fans are to be installed
on each of the vent risers on the building roof. A Fantech® Rn 4EC-4 Inline Radon Fan or design
engineer approved equivalent will be employed to actively exhaust the system.

• The fans will be constructed with UV protected materials and fan housing will be welded for
leak-proof housing construction.
• Fans will operate on 120-volt power supplies connected by a licensed electrician.
• Electrical junction boxes will be installed near the top of the exhaust risers.
• The fan exhaust piping will be covered with a rain cap to prevent rain infiltration.
• Preliminary typical fan specifications are provided in Appendix 5.

2.7 Monitoring Points
Fourteen permanent vacuum monitoring points (VMP-1 through VMP-14) and fifteen temporary
vacuum monitoring points (TVMP-1 through TVMP-15) consisting of minimum 1-inch PVC piping
to allow for measurement of pressure influence testing and sub-slab soil gas sample collection from
the gas permeable layer will be installed. The purpose of the monitoring points is for vacuum
influence testing and sub-slab soil gas sampling to be conducted post-installation of the VIMS and
pre-occupancy of the building (see Section 4) and to avoid puncturing the VPB20 vapor barrier.

• Vacuum monitoring points will be installed through the slab and vapor intrusion barrier and
open to the gas permeable layer. The vapor barrier will be sealed around the PVC monitoring
points per manufacturer instructions for penetrations.
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
Project Number 221862.30

April 5, 2023 │ 12
• The monitoring points will be installed at points relatively distant from the soil gas collection
system and at points near each suction point and associated horizontal piping to conduct
effectiveness testing. Monitoring point locations are subject to the sole discretion of the
NCDEQ Brownfields Program.
• The number and locations of the monitoring points may be altered to accommodate tenant
needs, pending approval from the VIMS design engineer, or in consultation with the
NCDEQ.
• Temporary vacuum monitoring points will be abandoned with NCDEQ approval following
VIMS influence testing.
• Permanent monitoring points will remain in the event post-occupancy testing is determined
to be required, so as to avoid creating future penetrations through the building slab and vapor
barrier that may impact the integrity of the VIMS.

3 QUALITY ASSURANCE/QUALITY CONTROL

3.1 VIMS Installation Monitoring and Inspection
The sub-slab vapor intrusion barrier with passive sub-slab depressurization system will be installed
by the PD’s selected qualified contractor. During each phase of the installation, qualified personnel
under the supervision of the design P.E. shall visit the site to conduct inspections and document
observations of the sub-slab depressurization system and the sub-slab vapor intrusion barrier. No
components of this system will be covered without inspection and full documentation. When
possible, NCDEQ will be provided with a minimum of two business days advance notification prior
to inspections. If a two-day advance notice is not possible due to time sensitive construction activities,
NCDEQ will be provided with as much notice as possible. Details of the monitoring and inspection
activities are summarized below.

• Inspector will be onsite periodically during the placement of the sub-slab vapor intrusion
barrier with passive sub-slab depressurization system to monitor installation activities.
• Inspector will observe sub-slab gravel and piping prior to the installation of the vapor barrier.
• Inspector will verify quantities of materials used.
• Inspector will monitor and observe a smoke test to verify and confirm proper functioning of
the VIMS.
• Before placement of concrete, inspector will conduct final site visit for a visual inspection of
the VIMS to determine if the VIMS has been damaged and needs repair.
• Inspector will observe vent riser piping prior to covering with drywall or other finishings.
• Inspector will observe roof riser vent exhaust outlets after installation.
• Inspector will document observations with field logs and photographs.

4 POST-CONSTRUCTION / PRE-OCCUPANCY EFFECTIVENESS TESTING

4.1 VIMS Influence Testing
Influence testing for the passive system will be conducted post-installation of the VIMS and pre-
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
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occupancy of the building. The objective of the testing is to document that all areas below the slab
can be effectively influenced by the installed VIMS network if conversion to an active system with
electric fans is needed in the future. The testing will involve attaching one or more vapor extraction
fans to the vertical risers and measurement of vacuum at the fan locations and vacuum monitoring
points. A pressure differential resulting in depressurization below the slab of 4 pascals or greater at
remote extents of each VIMS area is considered sufficiently depressurized.

Vacuum influence testing results will be submitted to NCDEQ as part of the VIMS Installation
Completion Report. If the influence testing results indicate that modifications to the VIMS are needed
to achieve sufficient sub-slab depressurization, NCDEQ will be notified of the modifications prior to
submittal of the VIMS Installation Completion Report.

Temporary vacuum monitoring points will be abandoned with NCDEQ approval following VIMS
influence testing. Permanent monitoring points will remain in the event post-occupancy testing is
determined to be required, so as to avoid creating future penetrations through the building slab and
vapor barrier that may impact the integrity of the VIMS. No post-occupancy influence testing is
proposed at this time. If warranted based on evaluation results, or at the direction of the NCDEQ,
further testing will be conducted. A Work Plan for additional influence testing will be submitted to
NCDEQ for approval prior to testing.

4.2 Post-Construction/ Pre-Occupancy Sub-Slab Soil Gas Sampling
Sub-slab soil gas sampling will be conducted post-installation of the VIMS and pre-occupancy of the
building. Eight samples (or a number deemed sufficient in discussions with NCDEQ) will be
collected from select monitoring points according to the NCDEQ Division of Waste Management
Vapor Intrusion Guidance dated March 2018. Sub slab vapor sampling frequency and locations are
subject to the sole discretion of the NCDEQ Brownfields Program. A helium containment shroud
will be placed around the monitoring point and sample canister, tubing, and connections and a leak
check test was performed. The sub-slab soil gas sampling points will be purged of at least three
sample train volumes with a syringe or pump into a Tedlar® bag, and purged air will be screened
with a helium detector. The helium concentrations detected in the purged vapors will be considered
acceptable if they do not exceed 10% of the concentration maintained within the shroud. Should a
sample point fail its respective helium test, the monitoring point will be evaluated and repaired as
appropriate, and additional helium testing performed until acceptable results are measured.

Sub-slab soil gas samples will be collected from the sampling points using laboratory provided batch
certified Summa canisters with flow controllers calibrated to approximately 200 milliliters per minute
(mL/min). The target final vacuum level of the sample canisters will be approximately 5 inches of
mercury (in HG). One duplicate sub-slab soil gas sample will be collected. The samples will be
transported under standard chain of custody protocol to a certified laboratory. The sub-slab soil gas
samples will be submitted for analytical testing of VOCs by US EPA method TO-15.

Analytical results will be input into the NCDEQ Risk Calculator to evaluate the soil-gas to indoor air
pathways for residential and non-residential receptors, and results will be compared to NCDEQ’s
acceptable risk thresholds (incremental lifetime cancer risk of 10-4 and hazard index of 1). Sampling
activities will be summarized, and results will be presented in the VIMS Installation Completion
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
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Report (Section 7). If results warrant additional data collection including indoor air samples, a Work
Plan for additional sampling will be submitted to NCDEQ for approval prior to sampling.

4.3 Post-Construction/ Pre-Occupancy Indoor Air Sampling
Indoor air sampling will be conducted post-installation of the VIMS and pre-occupancy of the
building. Six indoor air samples (or a number deemed sufficient in discussions with NCDEQ) will be
collected from select areas of the building interior according to the NCDEQ Division of Waste
Management Vapor Intrusion Guidance dated March 2018. Indoor air samples will be collected a
minimum of one week after the building HVAC system has become operational and the building is
sufficiently completed (e.g., windows and doors installed and sealed). Indoor air sampling frequency
and locations are subject to the sole discretion of the NCDEQ Brownfields Program.

Indoor air samples will be collected using laboratory provided batch certified Summa canisters with
flow controllers calibrated to collect over approximately 8 hours. One duplicate indoor air sample
will be collected. One background outdoor air sample will be collected concurrently with the indoor
air samples. The samples will be transported under standard chain of custody protocol to a certified
laboratory. The sub-slab soil gas samples will be submitted for analytical testing of VOCs by US
EPA method TO-15.

Analytical results will be input into the NCDEQ Risk Calculator to evaluate the indoor air risk for
residential and non-residential receptors, and results will be compared to NCDEQ’s acceptable risk
thresholds (incremental lifetime cancer risk of 10-4 and hazard index of 1). Sampling activities will
be summarized, and results will be presented in the VIMS Installation Completion Report (Section
7).

4.4 VIMS Effectiveness Testing Reporting and Contingency for Conversion to Active VIMS
VIMS effectiveness testing including vacuum influence testing and sub-slab soil gas and/or indoor
air sampling results will be included in the VIMS Installation Completion Report (Section 7).
Preliminary results will be shared with the NCDEQ. If calculated cumulative risks for a non-
residential scenario continue to exceed acceptable levels for NCDEQ’s risk thresholds (incremental
lifetime cancer risk of 10-4 and hazard index of 1) as a result of structural vapor intrusion,
considerations will be made to convert the system from a passive system to an active system. The
building shall not be occupied until approval is provided by NCDEQ based on pre-occupancy data.
This requirement is separate from a certificate of occupancy provided by local code enforcement or
other federal, state, or local occupancy authorizations.

4.5 Future Slab Modifications, Pour Back, and System Protection
No pour back areas are planned in the current construction schedule. As also discussed in Section 6,
If slab modifications are made in the future, communication testing will be required after completion
of each of the following events:

• Based on the results of the post-construction/ pre-occupancy sub-slab soil gas sampling
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
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discussed in Section 4.2, in the event Trichloroethylene (TCE) is present, preventative
measures will be implemented when the VIMS barrier is removed,
• Once the pour back area VI barrier has been installed,
• Following completion of tenant up-fit activities,
• Prior to pouring the concrete floor slab, and
• Following repair of any damage to the VI barrier.

NCDEQ will be notified of a minimum of two business days prior to the start of slab modifying
activities. A Work Plan approved in writing by NCDEQ for sampling and protective measures will
be prepared if the building is to be occupied during such activities.

Vent risers within the building will be installed within wall cavities for system protection and
aesthetics. To aid in identification of the vapor mitigation piping, the above-slab piping will be
labeled with “Vapor Mitigation – Contact Maintenance”, or similar language, on all accessible piping
at intervals of no greater than 10-linear feet. Vent risers will exhaust from the building roof and be
inaccessible to the general building occupants other than maintenance or service contactor personnel.

5 POST-OCCUPANCY EFFECTIVENESS TESTING

Two semi-annual sub-slab soil gas and indoor air sampling events will be conducted post-occupancy
of the building. Samples will be collected according to the respective scopes outlined in Sections 4.2
and 4.3.

If warranted based on sub-slab soil gas and indoor air sampling risk evaluation results, and in
consultation with the NCDEQ, post-occupancy sampling scope may be modified, resampling may be
determined to be necessary, or sampling events may be determined to be able to cease. Permanent
monitoring points will remain in the event additional post-occupancy testing is determined to be
required or directed by the NCDEQ, to avoid creating future penetrations through the building slab
and vapor barrier that may impact the integrity of the VIMS.

6 FUTURE TENANTS & BUILDING USES

Continued operation of the VIMS within requires on-going adherence to the system post-occupancy
operation, maintenance, monitoring (OM&M) requirements from future owners, tenants, and
occupants. Notification of the presence and requirements of the system must be given to building
tenants and occupants by the owner, and future owners should be made aware of system requirements.
To aid in identification of the vapor mitigation piping, the above-slab piping will be labeled with
“Vapor Mitigation – Contact Maintenance”, or similar language, on all accessible piping at intervals
of no greater than 10-linear feet. Building modifications should not alter system components (e.g.,
riser pipes, exhaust fans, concrete slab, retaining walls, sub-slab components) without approval from
a P.E. If the vapor intrusion barrier is exposed or penetrated (e.g., for installation of sub-slab utilities),
approval is required. Approved changes to system components should be conducted under the
QA/QC requirements described in Section 3. System changes should be documented in revised as-
built drawings. Future VIMS maintenance and upkeep will be the responsibility of the building owner
or property management group.
Passive VIMS Design Plan – BF No. 25071-21-034 –Patterson Avenue Property ● Winston-Salem, North Carolina
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7 REPORTING

Within 60 days following the completion of initial post-construction testing as outlined in Sections 4
and 5 above, a VIMS design representative will prepare a report summarizing the above installation,
quality assurance measures, and installation and post-construction monitoring and inspection to
include the following:

• A report prepared and submitted to the Brownfields Program under P.E. seal.
• Summary of the installation, QA/QC measures, post-construction/pre-occupancy system
effectiveness testing, post-occupancy effectiveness testing, and any deviations from this
approved design plan.
• A statement from the P.E. providing an opinion of whether the VIMS was delivered in a
condition consistent with the VIMS design and objectives. Note: Certain components of these
reporting requirements, including pressure measurements, sub slab vapor sampling, and
indoor air sampling, can be conducted and reported under a N.C. licensed Professional
Geologist seal.
• Appendices to include:
o as-built drawings (also signed/sealed by a P.E.);
o all inspection logs including photographs and field logs; and
o an index of, and individual safety data sheets for, any materials used during
construction that could contribute to background indoor air contamination.
• P.E. sealed statement regarding the system effectiveness as follows: “The VIMS detailed
herein is designed to mitigate intrusion of subsurface vapors into the subject building from
known Brownfields Property contaminants in a manner that is in accordance with the most
recent and applicable guidelines including, but not limited to, 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. The sealing professional engineer below is satisfied that the design and its
installation are fully protective of public health from known Brownfields Property
contaminants.”

The VIMS Installation Completion Report will be submitted to the NCDEQ Brownfields Program
for occupancy consideration. It is understood NCDEQ may provide conditional occupancy
approval with submittal of a data and risk summary based on the proposed building occupancy date
and full report preparation and review time.

Appendix 1
VIMS Design Submittal Requirements Checklist
VIMS Design Checklist Version 1, March 2022
Vapor Intrusion Mitigation System (VIMS)
Design Submittal Requirements
NCDEQ Brownfields Program – March 2022
In order to more efficiently process and approve VIMS designs, the Brownfields Program has standardized the format for design
submittals. We have generated this format in the form of a checklist to allow for ease in submittal by the prospective developer’s
consultant and the Brownfields Program’s completeness review. The checklist below outlines the minimum requirements and
submittal format under the Brownfields Program for VIMS system design considerations and reporting. All VIMS design submittals
to the Brownfields Program must include this completed checklist in this required format. Strictly adhering to these design
submittal requirements will allow DEQ to minimize its review time for the design and the scope of performance and pre-
occupancy sampling wherever possible. However, if these requirements are not followed fully, DEQ will require a more
extensive and on-going sampling protocol to ensure that the VIMS is fully protective of public health. For the purposes of
these requirements, PE shall mean a Professional Engineer licensed in North Carolina.
The benefits of following these requirements include:
-Significant Professional Engineering design discretion by a PE as to the VIMS design;
-Minimal turnaround time as the Brownfields Program review will consist of a completeness check rather than a
detailed design review;
-Pre- and post-occupancy sampling location and frequency minimization and the lowest possible frequency of pre-
/post-occupancy sampling to confirm system efficacy, at DEQ’s discretion; and
-Potential reduction in long term monitoring requirements and costs.
If these requirements are not followed, and the VIMS design fails a completeness check:
-Significant delays and associated costs may be incurred as DEQ conducts an in-depth review;
-Subsequent design modifications and costs of delay associated with multiple review iterations; and
-The establishment of extensive ongoing sampling requirements to ensure adequate system performance and
public health protection.
Please note that this VIMS design submittal is not the end of communication with the Brownfields Program. Best practices
for successful project completion and avoiding installation/construction delays include maintaining close coordination and
consultation with the Brownfields Program between the PD, VIMS contractors, and all general contractors for the
installation of the design. This will avoid costly construction delays and installation issues that would trigger additional
monitoring requirements that otherwise would not be necessary. It is important that significant advance notification of
schedules, and subsequent rescheduling as it occurs, for the following activities (at a minimum) is provided to the
Brownfields Program:
-Project construction;
-Design modification/addenda;
-Installation;
-Performance testing; and
-Inspections
Note: The format below should be followed verbatim in its entirety in the VIMS design submittal to satisfy and facilitate the
completeness review performed by the DEQ Brownfields Program. In addition, this document is to be completed and
submitted as a checklist along with the design to ensure the necessary elements are addressed in the design.
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VIMS Design Checklist Version 1, July 2021
☐ Section 1. Introduction
Provide a brief background of the Brownfields Property and basis for installing a VIMS (e.g. off-site migration of
contaminants, on-site releases, chlorinated solvents, pre-emptive approach for residential redevelopment, etc.). Document
the type of foundation design required by construction plans (e.g. waffled construction, ground floor post-tension cabling,
build-to-suit construction, or other unique construction plans). Additional items to be included in the VIMS design
submittal must include:
☐ Brownfield Project ID#, Parcel #s, address(es), site history, approximate acreage of site, and contact
information for the developer, consultant, VIMS installation contractor, and Brownfields Project Manager.
☐ If vapor mitigation is not proposed for all buildings (new, existing, or partial building), provide a risk-based
justification for why mitigation is not needed for all buildings (note that confirmatory sampling of unmitigated
areas may be required post construction/renovation).
☐ Discussion of proposed site redevelopment (e.g., townhomes, apartments, commercial, mixed-use, retail, etc.),
and general layout of building(s) - (e.g., garage on first floor, with living space on second and third floors,
presence of elevators, former textile mill with ground floor and basement level apartments, podium parking first
floor, 10 story apartment building with podium parking on first three floors, etc.).
Include references to the following figures (to be included in the Figures section outlined below):
☐ Site vicinity map
☐ Figures detailing all existing and/or proposed buildings overlain on historical sampling locations/known
impacts
☐ Figures detailing the approximate ground floor square footage, including square footage of area proposed for
mitigation (if different), of relative buildings and their proposed use per floor. Include footprint of planned
demolition or retention of existing buildings.
☐ Locations of thickened footers, separate slabs, etc. that may hinder communication between slab segments
☐ Locations of relevant mitigation features (including but not limited to extent of vapor barrier, suction lines,
risers, extraction points, pressure monitoring points, etc.)
☐ Locations of vertical walls in contact with soils (and a statement regarding whether any such features exist or
not)
☐ The Design and any figures as appropriate have a PE Seal using the following language:
“The Vapor Intrusion Mitigation System (VIMS) detailed herein is designed to mitigate intrusion
of subsurface vapors into the subject building from known Brownfields Property contaminants in
a manner that is in accordance with the most recent and applicable guidelines including, but not
limited to, 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. The sealing professional engineer below is
satisfied that the design [add “and its installation” for use in an installation report] is [are]
fully protective of public health from known Brownfields Property contaminants.”
Note: If a VIMS is not installed for certain portions of a Brownfields Property due to open-air ‘podium’ construction or
parking decks, a VIMS may still be required for features such as elevator shafts, stairwells, and/or areas with utility
penetrations that exchange air with occupied areas. Confirmatory sampling of these areas and associated occupied spaces
may be required during post construction/renovation.
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VIMS Design Checklist Version 1, July 2021
☐ Section 2. Design Basis
Specify which type(s) of VIMS is intended for the planned structures, selecting which is appropriate, and explaining the
basis for the selection:
☐Passive System. Note for all passive systems, a mechanism/process shall be established (to be approved by
DEQ) by which the system can be made active, which may include a reliance on information from pressure
measurements, soil gas and/or indoor air sampling, or changes in site conditions. A passive system should be
designed and installed such that the passive system is as effective as an active system at preventing vapor intrusion.
☐Active System. Note a pressure differential resulting in depressurization below the slab of 4 pascals or greater at
remote extents of each VIMS area is considered sufficiently depressurized (low pressure readings such as 1 to 2
pascals may be acceptable if employed with continuous pressure measurement during varied HVAC situations,
weather events, and climate for winter and summer months). An overview of the alarm system that informs
appropriate parties in the event the system malfunctions should be included.
Note: Pressure monitoring points are recommended to be placed at locations remotely distant from where each suction point
transitions to below the slab in addition to locations positioned near each suction point and associated horizontal piping. If
monitoring points are not installed at remote locations, future sampling requirements may necessitate installation of
additional monitoring locations or an evaluation of indoor air quality.
For all system designs, the following design specifications must be included as exhibits:
☐ Sub-slab Venting Construction Materials and Installation. Design specifications must be included as an exhibit
(see Section 8 below). All piping, including above a roof line must be labeled at intervals no greater than 10 linear
feet permanently labeled with Vapor Intrusion Mitigation System” with contact information for questions or
repairs.
☐ Membrane Vapor Barrier Construction Materials and Installation. Design specifications must be included as an
exhibit (see Section 8 below). Particular attention should be paid to the design and diagrams for sealing barriers at
slab penetrations and edges. Note: Brownfields Property contaminants of concern (COCs) must not be present in
building materials.
Note: If materials are proposed that are not specifically rated for chemical resistance to specific site contaminants of
concern, this will have a bearing on DEQ’s determination of performance testing requirements following construction.
Specification documentation should be provided for all materials utilized as part of the VIMS.
Note: All utility penetrations are required to include trench dams. Include details on trench dam installation as part of
system design.
☐ Section 3. Quality Assurance / Quality Control
☐ Details on planned inspections are required for all gravel & piping prior to installing the vapor barrier, and are
required for all sections of the vapor barrier prior to pouring the slab. These inspections must be conducted by
qualified personnel under the supervision of the design PE and include field logs and photographs.
☐ A statement committing to provide a minimum of 2 business days’ advance notification to the Brownfields
Program prior to inspections should be included.
☐ Smoke Testing and/or Thickness (Coupon) Measurements: Smoke testing is strongly recommended for both
roll-out and spray applied barriers.Coupon testing will be required on spray application barriers only.
Note: Non-performance of adequate inspections or smoke testing will have a bearing on DEQ’s determination of
performance testing requirements following construction.
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VIMS Design Checklist Version 1, July 2021
☐ Section 4. Post-Construction / Pre-Occupancy Effectiveness Testing
☐ Discussion of Pilot/Influence Testing is required for passive and active systems prior to occupancy with the
objective being to document that all areas below the slab can be effectively influenced by the current piping
network. Testing details should include, at minimum:
☐ Pressure monitoring points: Note based on pilot testing results and review by the Brownfields Program,
the number of pressure monitoring points installed for pilot testing may ultimately reduce the number of
permanent pressure monitoring points.
☐ Pressure monitoring points are placed at locations that are demonstrated to be remotely distant
from where each suction point transitions and are located at the extents of the area of influence to
below the slab in addition to locations near each suction point and associated horizontal piping
☐ Sub-slab vacuum monitoring and/or sample collection points: Note these should be installed PRIOR to
installation of floor slab(s). Drilling through concrete slabs and VIMS barriers after a concrete slab is in
place may result in significant issues regarding the sealing of the sampling point to the VI barrier once the
concrete slab has been poured.
☐ A statement committing to provide a minimum of 2 business days’ advance notification to the
Brownfields Program prior to inspections should be included.
☐ Discussion of pour back areas including:
☐ Protection of and testing following completion: Note if concrete pour back areas for future tenants are
included in the VIMS design or if slab modifications are made in the future, communication testing will be
required after completion of each of the following events: 1) in the event TCE is present, preventative
measures implemented when the barrier is removed, 2)once the pour back area VI barrier has been installed,
3) following completion of tenant up-fit activities, 4) prior to pouring the concrete floor slab, and 5)
following repair of any damage to the VI barrier.
☐ Commitment to DEQ notification of a minimum of 2 business days prior to the start of tenant up-fit
activities.
☐ Discussion regarding sampling/protective measures that will be taken if a building is occupied during up-
fit activities.
Note: Section 3 (Quality Assurance/Quality Control) above will apply to all future pour backs and slab modifications; these
requirements apply to all system or slab alterations regardless of how small the altered area. If pour-back area
communication testing is not deemed sufficient prior to floor slab being poured, this will result in the need for additional
sampling. Alteration of pour back areas or alteration of slabs in the future may necessitate future sampling of the site
buildings.
☐ Discussion of protection of exposed systems: During any time that the system is left exposed (i.e. without a
concrete/wooden cover in place), protective measures must be implemented, as noted above, and scheduled
inspections of the exposed system are required. In addition to the pre-occupancy testing, during the time that the
system is left exposed, monitoring, including vapor intrusion assessment, will be conducted in the subject building.
If PCE, TCE, and/or select daughter products are present at the Brownfields Property, indoor air sampling will be
required.
☐ Discussion of proposed pre-occupancy soil gas and/or indoor air sampling: Sampling is to be completed prior
to occupancy and the data will be compared to applicable DEQ screening criteria. Include considerations for
resampling in the event that impacts are identified above applicable criteria. Note: Unlike the remainder of this
document, which has significant PE discretion in design; soil gas/indoor air sampling frequency and locations is
subject to the sole discretion of the DEQ Brownfields Program.
Note: Pilot/Influence Testing, Soil Gas, and/or Indoor Air Sampling must be submitted to the Brownfields Program for
conditional occupancy considerations as per standard Brownfields VI provisions.
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☐ Section 5. Post-Occupancy Effectiveness Testing – Should be specified with the design submittal and not
at a later date.
☐ Discussion of On-going Pressure Testing: Note this is required for active systems to be conducted on a
monthly basis for the first year with collected information submitted to the Brownfields Program on a quarterly
basis (or via telemetry data submittals on a basis as pre-approved by DEQ). Based on the first year of pressure
readings, and with approval of the Brownfields Program, pressure testing may be collected quarterly (see below)
and data would be submitted with the annual Land Use Restriction Update (LURU) following the first year of data
collection. Note that the Brownfields Program utilizes a ‘sliding scale’ of pressure reading collection frequency vs.
the stated depressurization goal or observed depressurization (e.g., if a VIMS is designed (or observed) to obtain a
pressure differential less than 4 pascals, more frequent depressurization measurements will be necessary and may
include continuous data logging; or an upgrade to the VIMS to increase pressure differentials may be necessary).
☐ Discussion of proposed post-occupancy sub slab vapor and/or indoor air sampling: Sampling is to be completed
post occupancy and the data will be compared to applicable DEQ screening criteria. Include considerations for
resampling in the event that impacts are identified above applicable screening criteria. Note: Unlike the remainder
of this document, which has significant PE discretion in design; sub slab vapor/indoor air sampling frequency and
locations is subject to the sole discretion of the DEQ Brownfields Program.
Note: In addition to these requirements, townhomes remain subject to the sampling requirements outlined in the DEQ
Brownfields Townhome Minimum Requirements located at www.ncbrownfields.org. Ensure that Townhome
redevelopment has been approved by the NC DEQ Brownfields Program in advance of redevelopment planning.
☐ Section 6. Future Tenants & Building Uses
This section must address plans to notify future tenants of the presence of a VIMS and to prevent future tenants or
occupants from exposing/damaging the VIMS without the oversight of a qualified P.E. Note that if the VIMS is
exposed (for installation of new utilities, etc.), the same inspection requirements and reporting as for initial
installation is required.
☐ Section 7. Reporting
This section must discuss reporting deliverables within 60 days following completion of initial post-construction testing as
outlined in Sections 4 and 5 above and a commitment to include in the final deliverable:
☐ A report prepared and submitted to the Brownfields Program under PE seal
☐ Summary of the installation, QA/QC measures, post-construction/pre-occupancy system effectiveness testing
☐ A statement from the PE providing an opinion of whether the VIMS was delivered in a condition consistent with
the VIMS design and objectives. Note: Certain components of these reporting requirements, including pressure
measurements, sub slab vapor sampling, and indoor air sampling, can be conducted and reported under a N.C.
licensed Professional Geologist seal.
☐ Appendices to include at minimum:
☐ as-built drawings (also signed/sealed by a PE);
☐ all inspection logs including photographs and field logs. Note that the inspection logs do not need to be
addressed in the text of the report unless information pertinent to the operation of the VIMS was discovered; and
☐ An index of, and individual safety data sheets for, any materials used during construction that could
contribute to background indoor air contamination.
☐ PE sealed statement regarding the system effectiveness verbatim as follows:
“The Vapor Intrusion Mitigation System (VIMS) detailed herein is designed to mitigate intrusion
of subsurface vapors into the subject building from known Brownfields Property contaminants in
a manner that is in accordance with the most recent and applicable guidelines including, but not
limited to, DWM Vapor Intrusion Guidance, Interstate Technology & Regulatory Council (ITRC)
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VIMS Design Checklist Version 1, July 2021
guidance, and American National Standards Institute (ANSI)/American Association of Radon
Scientists and Technologists (AARST) standards. The sealing professional engineer below is
satisfied that the design [add “and its installation” for use in an installation report] is [are]
fully protective of public health from known Brownfields Property contaminants.”
☐ Section 8. Design Submittal Exhibits
Drawings to be included:
☐ General Site Location Map (to include a scale and north arrow)
☐ Site Figure that includes:
☐ The Brownfields Property boundary and immediately adjacent properties or landmarks such as
streets;
☐ Graphic scale and north arrow;
☐ Historical sampling locations and known impacts (groundwater, soil, soil-gas, subs-slab, indoor air,
and if available on-site or adjacent surface water locations) relative to existing and proposed structures;
and
☐ Reference to table(s) in the VIMS Plan where analytical results are provided. These results should
be compared to the appropriate screening criteria (residential or non-residential IASL’s, etc.).
☐ Design Specifications: Sub-Slab Venting Construction Materials and Installation; Membrane Vapor
Barrier Construction Materials and Installation
☐ Material Specification Sheets for all items associated with the VIMS (vapor barrier, piping, mastic, tape,
sealants, cleaners, etc.)
☐Section 9. Special Considerations for Retrofits
The following details will need to be provided for DEQ review for a planned retrofit of existing buildings:
☐ Complete explanation of subsurface structural conditions on all site buildings, including those buildings that are
not proposed for mitigation but will remain on-site including but not limited to details on the presence or absence of
the following:
☐ Basements/crawlspaces;
☐ Vertical walls in contact with soil;
☐ Details on slab thickness and underlying conditions (i.e. slab on gravel, slab on grade, slab over
crawlspace, etc.);
☐ Details on number of slabs per building that are connected that have differing thicknesses or thickened
footer separations or sub-walls that would create isolated slab areas for consideration or would hinder overall
VIMS influence;
☐ Obvious issues with slab integrity such as cracks or voids, etc.);
☐ Presence of sub-slab utility conduits, trenches, or tunnels that could act as preferential pathways and the
need to mitigate (e.g. installation of trench dams, anti-seep collars, etc.);
☐ Sumps;
☐ Elevator pits; and
☐ Other applicable subsurface building features.
☐ Details on proposed sealing/repairs of obvious/existing concrete slab from minor caulking of floor
cracks/expansion joints, and VIMS core drilled suction points, to possible VIMS saw cut trench sealing or
specialized coatings for entire floor slab (e.g. Retro-CoatTM or other similar coatings).
☐ Details on radius of influence in pilot/communication testing planned.
☐ Existing buildings to remain as part of redevelopment and/or proposed buildings shown on the Site Plan should
be accurate and complete. At a minimum, plans should provide the following details:
8
VIMS Design Checklist Version 1, July 2021
☐Detailed foundation plans - In addition to displaying piping network and proposed monitoring point
locations, foundation plans should show all footers, grade beams, and other sub-slab features that could
affect vacuum communication. This would also include sub-grade crawl spaces, basements, tunnels, walk-
out basements, elevator pits, and other situations where soil is in contact with side walls of structure in
addition to below the footprint of the building slab. Provide details on any vertical walls in contact with soil
and the planned mitigation of such.
☐Drawings shall be provided of each VIMS barrier sealing detail, including piping layout (transition from
slotted PVC, terra vent, etc. to solid piping through grade beams for example, and examples of these detail
drawings should be called out on VIMS layout drawing. When possible, drawings should be provided in
color so that VIMS piping, extents of proposed vapor barrier, proposed sample/vacuum monitoring locations
and other features can be easily distinguished.
☐Detailed drawings of grade beams, thickened slabs, and other sub-slab features that could affect VIMS
influence must be clearly defined and easily discernable from existing or proposed interior walls that are
above the floor slab (which would have no effect on vacuum influence below the slab).
Useful Reference(s):
☐ NOTE: Include references to any guidance/documents used or referenced by the PE during design of the VIMS.
Division of Waste Management (March 2018, Version 2) - “Vapor Intrusion Guidance”
Note: this document also contains in Appendix H the “Brownfields Program Vapor Intrusion Mitigation System (VIMS)
Design Submittal New Construction Minimum Requirements Checklist”
https://deq.nc.gov/about/divisions/waste-management/waste-management-permit-guidance/dwm-vapor-intrusion-guidance
“North Carolina Brownfields Program Minimum Requirements for Townhome Developments”(May 2020)
https://deq.nc.gov/about/divisions/waste-management/bf/statutes
ITRC Guidance Website - “Technical Resources for Vapor Intrusion Mitigation”
https://www.itrcweb.org/Guidance/ListDocuments?topicID=28&subTopicID=39
ANSI/AARST CC-1000, “Soil Gas Control Systems in New Construction of Buildings”.
Note: CC-1000 includes companion guidance that is not part of the ANSI/AARST American National Standard
Institute (ANSI), and may contain material that has not been subjected to public review or a consensus process.
https://standards.aarst.org/CC-1000-2018/4/

Appendix 2
Figures
Figure 1. Site Location MapPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 0.25 0.50.125 Miles
Legend
Site Location
q
1 inch = 0.25 miles
Subject Property
Figure 2. Sample Location PlanPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 200 400100Feet
Legend
Sample Point
!>Soil Boring
<<>Soil Boring/Monitoring Well
!>Soil Gas
!>Sub-Slab Soil Vapor
!>Historic Sample
Site Location
q
Figure 3. Site Potentiometric MapPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 200 400100Feet
Legend
!>Groundwater Monitoring Well
Site Location
q
Survey results for TMW-1 wereobtained; however the elevationgiven was accompanied by anindicated probable maximumvertical error 0.58 feet.
Figure 4A. Soil Analytical Results MapPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 200 400100Feet
Legend
!>Sample Points
Site Location
q
Notes:
Only select compounds with exceedances shown. Samples collected on 5/25/2022.Concentrations reported in milligrams per kilograms (mg/Kg)
Italics = exceeds Residential Health Based PSRGUnderlined =exceeds Industrial/Commercial Health Based PSRGBold = exceeds Protection of Groundwater PSRGND = Not Detected above laboratory reporting limitsBaP = Benzo(a)pyreneAs = ArsenicCr(VI) = Hexavalent Chromium
Figure 4B. Groundwater Analytical Results MapPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 200 400100Feet
Legend
!>Groundwater Monitoring Well
Site Location
q
TMW-4ND
TMW-33 Benzene:1,2-Dichloropropane:Naphthalene (VOC):Naphthalene (SVOC):n-Propylbenzene:Tetrachloroethene:Trichloroethene:
131 1.8144249.683.647.67.33
TMW-2ND
TMW-1Lead (Total):Lead (Dissolved):38 34
Notes:Only select compounds with exceedances shownSamples collected on 5/27/2022Concentrations reported in micrograms per liter (µg/L)Bold = Exceeds NCDEQ 2L StandardND = Not Detected above laboratory reporting limits
Figure 4C. Soil Gas Analytical Results MapPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 200 400100Feet
Legend
Type
!>Soil Gas
!>Sub-Slab Soil Vapor
Site Location
q
Notes:
Only select compounds with exceedances shownSamples collected on 5/26/2022.Concentrations reported in micrograms per cubic meter (µg/m3).Bold = Exceeds NCDEQ Residential Soil Gas Screening LevelND = Not Detected above laboratory reporting limits
1,3-BD = 1,3-ButadieneChl = ChloroformNap = NaphthalenePCE = Tetrachloroethene
!>
!>
!>
!>
!>
!>!>
!>
!>
!>
!>
!>
!>
!>
!<>
!<>
!<>
!<>
!>
!>
!>
!>
!>
!>
SS-8
BG2/TW-3
BG1/TW-2
SS-9
SS-7
SS-6
SS-5
SS-3
SS-1
SSV-3
SSV-2
SSV-1
SS-15
SS-13
SS-11
SS-10
SS-4/TMW-2
SS-2/TMW-1
SS-14/TMW-4
SS-12/TMW-3
SG-4
SG-3
SG-2
SG-1
Figure 5. Proposed Development PlanPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 175 35087.5 Feet
Legend
Type
!>Soil Boring
!<>Soil Boring/Monitoring Well
!>Soil Gas
!>Sub-Slab Soil Vapor
!>Historic Sample
Site Location
q
Figure 6. Receptor Survey MapPatterson Avenue Site Brownfields Assessment ServicesBrownfields Project ID: 25071-21-034N. Patterson Avenue, Ivy Avenue, and E. Tenth StreetWinston-Salem, Forsyth County, North CarolinaGeo-Hydro Project Number 221862.30
0 750 1,500375Feet
Legend
Stream
1,500 Ft Radius
Site Location
Tax Parcel
q

Appendix 3
Tables

Well ID Well Diameter (in) TOC Elevation (ft)
Well Depth (ft
bgs)
Screen Interval (ft
bgs)
Depth to
Groundwater (ft
TOC)
Groundwater
Elevation (ft)
TMW-1 1 933.36 44 34 - 44 32.8 900.56
TMW-2 1 915.67 18 8 - 18 8.8 906.87
TMW-3 1 922.48 30 20 - 30 24.0 898.48
TMW-4 1 898.00 26 16 - 26 11.1 886.90
Created by : JM 6/24/2022 Checked by: GP 6/24/2022
Notes:
in = inches; ft = feet; bgs = below ground surface; TOC = top of casing
Depth to groundwater and well depth measurements collected on March 31, 2020.
Survey results for TMW-1 were obtained; however the elevation given was accompanied by an indicated probable
maximum vertical error of 0.58 ft.
Patterson Avenue Property, Winston-Salem, NC
Brownfields Project ID 25071-21-034
Geo-Hydro Project Number 221862.30
Table 1: Summary of Temporary Monitoring Well Construction and Groundwater Elevation Data

Residential
Health Based
Industrial/
Commercial
Health Based
Protection of
Groundwater
Date Collected 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 5/25/2022 --- --- ---
Sample Depth (Ft)5 5 5 5 5 5 10 7.5 5 5 5 5 5 5 5 5 1 1 1 --- --- ---
Acetone 0.114 0.023 J 0.143 0.027 0.075 0.136 0.052 0.096 0.054 0.134 0.069 0.059 0.156 0.271 0.037 0.009 J NE NE NE 14000 210000 25
n-Hexane 0.001 J 0.001 J 0.001 J <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0007 <0.0007 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 <0.0008 NE NE NE 130 540 55
Methyl Ethyl Ketone (MEK) 0.003 J 0.003 J 0.018 J 0.002 J 0.007 J 0.016 J 0.003 J 0.006 J 0.006 J 0.011 J 0.005 J 0.004 J 0.013 J 0.018 J 0.001 J 0.001 J NE NE NE 5500 40000 17
Tetrachloroethene <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 0.002 J 0.001 J <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 <0.001 NE NE NE 17 82 0.0063
Toluene <0.0008 <0.0008 <0.001 <0.001 <0.001 0.001 J <0.008 <0.008 <0.007 <0.007 <0.008 <0.008 <0.008 <0.008 <0.008 <0.008 NE NE NE 990 9700 8.3
Benzo(a)anthracene <0.167 <0.163 <0.215 0.306 J 0.333 J <0.174 <0.163 0.204 J <0.157 <0.156 <0.159 0.282 J <0.167 <0.171 <0.175 <0.158 NE NE NE 1.1 21 0.35
Benzo(a)pyrene <0.176 <0.173 <0.227 0.417 J 0.546 J 0.206 J <0.173 0.208 J <0.166 <0.165 <0.169 0.237 J <0.176 <0.181 <0.185 <0.167 NE NE NE 0.11 2.1 0.12
Benzo(b)fluoranthene <0.175 <0.172 <0.226 0.554 J 0.591 J 0.278 J <0.171 0.266 J <0.165 <0.164 <0.168 0.391 J <0.175 <0.180 <0.184 <0.166 NE NE NE 1.1 21 1.2
Benzo(g,h,i)perylene <0.163 <0.160 <0.210 0.312 J 0.436 J <0.170 <0.160 <0.173 <0.154 <0.153 <0.156 0.203 J <0.163 <0.168 <0.171 <0.155 NE NE NE --- --- ---
Benzo(k)fluoranthene <0.164 <0.161 <0.212 <0.172 0.185 J <0.171 <0.161 <0.174 <0.155 <0.154 <0.157 <0.166 <0.164 <0.169 <0.172 <0.156 NE NE NE 11 210 12
Bis(2-ethylhexyl)phthalate <0.144 <0.141 <0.185 0.206 J 0.686 J 2.73 <0.141 <0.153 0.146 J <0.135 <0.138 <0.145 <0.144 <0.148 <0.151 <0.136 NE NE NE 39 160 14
Butyl benzyl phthalate <0.135 <0.133 <0.174 <0.141 <0.136 1.45 <0.133 <0.144 <0.128 <0.127 <0.130 <0.137 <0.135 <0.139 <0.142 <0.128 NE NE NE 290 1200 290
Chrysene <0.170 <0.167 <0.219 0.366 J 0.381 J 0.186 J <0.167 0.199 J <0.160 <0.160 <0.163 0.281 J <0.170 <0.175 <0.179 <0.162 NE NE NE 110 2100 36
Di-n-butyl phthalate <0.128 <0.126 <0.269 <0.134 0.148 J 0.137 J <0.126 <0.136 <0.121 <0.120 <0.123 <0.130 <0.128 <0.132 <0.135 <0.122 NE NE NE 1300 16000 35
Fluoranthene <0.148 <0.145 <0.190 0.633 0.628 J 0.319 J <0.144 0.406 J <0.139 <0.138 <0.141 0.653 J <0.147 <0.152 <0.155 <0.140 NE NE NE 480 6000 670
Indeno(1,2,3-cd)pyrene <0.215 <0.211 <0.277 0.327 J 0.489 J <0.224 <0.210 <0.228 <0.202 <0.202 <0.205 <0.217 <0.215 <0.221 <0.226 <0.204 NE NE NE 1.1 21 3.9
Phenanthrene <0.250 <0.245 <0.321 0.398 J 0.404 J <0.260 <0.244 0.266 J <0.235 <0.234 <0.239 0.425 J <0.250 <0.257 <0.262 <0.237 NE NE NE --- --- ---
Pyrene <0.161 <0.158 <0.207 0.600 J 0.568 J 0.293 J <0.157 0.353 J <0.151 <0.151 <0.154 0.568 J <0.161 <0.165 <0.169 <0.152 NE NE NE 360 4500 440
RCRA Metals by EPA 6020B/7471B
Arsenic <1.6 <5.8 2.7 3.7 4.2 1.8 3.00 2.9 4.1 3.8 2.8 1.6 1.3 1.7 3.3 <7.4 NE NE NE 0.68 3.0 5.8
Barium 75.5 72.8 118 197 118 10.8 81 84.7 75.9 65.8 67.4 208 149 69.5 115 145 NE NE NE 3100 47000 580
Cadmium <0.78 <2.9 <0.71 <0.61 0.83 <0.65 <0.60 <0.66 0.67 <0.55 <0.56 <0.64 <0.63 <0.60 <0.69 <3.7 NE NE NE 1.4 20 3.0
Chromium, Total* 3.3 20.7 20.7 39.5 40.4 4 39.6 23.5 26.7 37.3 26.1 56.6 13.1 18.5 14.4 45.9 NE NE NE NE NE NE
Chromium, Trivalent* 2.38 19.87 19.7 38.4 40.4 0.7 38.65 22.2 25.9 35.5 24.9 55.3 11.7 17.73 13.8 44.9 NE NE NE 23000 350000 360000
Chromium, Hexavalent*0.92 0.83 1 1.1 <0.52 3.3 0.95 1.3 0.8 1.8 1.2 1.3 1.4 0.77 0.6 1 NE NE NE 0.31 6.5 3.8
Lead 83.6 8.1 19.1 63.3 228 24.1 22.4 53 126 49.3 43.2 38.5 12.2 10.1 9.7 8.6 31.1 9.28 17.4 400 800 270
Mercury 0.15 <0.092 <0.12 <0.091 0.8 <0.11 <0.089 <0.090 0.11 0.21 <0.077 <0.099 <0.10 <0.092 <0.10 <0.11 NE NE NE 4.7 70 1.0
Selenium <1.6 <5.8 <1.4 <1.2 <1.3 <1.3 <1.2 <1.3 <1.3 <1.1 <1.1 <1.3 <1.3 <1.2 <1.4 <7.4 NE NE NE 78 1200 2.1
Silver <1.6 <5.8 <1.4 <1.2 <1.3 <1.3 <1.2 <1.3 <1.3 <1.1 <1.1 <1.3 <1.3 <1.2 <1.4 <7.4 NE NE NE 78 1200 3.4
Notes: Created by : GP 7/9/2022 Checked by: JM 7/14/2022
NCDEQ = North Carolina Department of Environmental Quality Italics = exceeds Residential Health Based PSRG Bold = exceeds Protection of Groundwater PSRG SVOCs = Semi-Volitile Organic Compounds NE= Not examined
PSRG = Preliminary Soil Remediation Goals January 2022 Underlined =exceeds Industrial/Commercial Health Based PSRG VOC = Volitile Organic Compunds ft bgs = feet below ground surface mg/Kg = miligrams per kilogram
Table 2: Summary of Soil Analytical Results
Patterson Avenue Property, Winston-Salem, NC
Brownfields Project ID 25071-21-034
Geo-Hydro Project Number 221862.30
North Carolina Department of Environmental
Quality
Preliminary Soil Remediation Goals
SS-12 SS-13 SS-14 SS-15
DUP
(Duplicate
of SS-7)
DP-1 DP-2 DP-DUP-1
SVOCs by EPA 8270E
VOCs by EPA 8260D
Constituent SS-3 SS-4 SS-5 SS-6 SS-11
(mg/Kg)
SS-1 SS-2 SS-7 SS-8 SS-9 SS-10
TMW-1 TMW-2 TMW-3 TMW-4
TMW-DUP-1
(TWM-4
Duplicate)
NCDEQ 2L
Groundwater
Quality Standard
NCDEQ
Residential
Vapor Intrusion
Groundwater
Screening Level
NCDEQ Non-
Residential
Vapor Intrusion
Groundwater
Screening Level
Date Collected 5/27/2022 5/27/2022 5/27/2022 5/27/2022 5/27/2022 --- --- ---
Screened Interval (ft bgs)34 - 44 8 - 18 20 - 30 16 - 26 16-26 --- --- ---
Acetone 5.82 1.88 J 6.64 <1.80 <1.80 6000 --- ---
Benzene <0.180 <0.180 131 <0.180 <0.180 1 2 69
n-Butylbenzene <0.185 <0.185 9.51 <0.185 <0.185 70 --- ---
sec-Butyl benzene <0.200 <0.200 16.7 <0.200 <0.200 70 --- ---
tert-Butyl benzene <0.920 <0.920 8.56 <0.920 <0.920 70 --- ---
Chloroform 2.63 <0.220 <0.220 <0.220 <0.220 70 1 3.6
1,1-Dichloroethane <0.240 <0.240 0.694 <0.240 <0.240 6 8 33
cis-1,2-Dichloroethene <0.200 <0.200 40.6 <0.200 <0.200 70 --- ---
1,2-Dichloropropane <0.190 <0.190 1.81 <0.190 <0.190 0.6 6.6 29
Ethylbenzene <0.170 <0.170 358 <0.170 <0.170 600 4 15
n-Hexane <1.30 <1.30 14.9 <1.30 <1.30 400 2 8.3
2-Hexanone
(Methyl butyl ketone)<0.380 <0.380 3.77 J <0.380 <0.380 40 1600 6900
Isopropylbenzene <0.180 <0.180 57.0 <0.180 <0.180 70 --- ---
4-Isopropyl toluene <0.089 <0.089 22.8 <0.089 <0.089 --- --- ---
4-Methyl-2-Pentanone (Methyl isobutyl
ketone)<1.00 <1.00 3.47 J <1.00 <1.00 100 110000 470000
Naphthalene <0.470 <0.470 442 <0.470 <0.470 6 4.6 20
n-Propylbenzene <0.190 <0.190 83.6 <0.190 <0.190 70 490 2000
Styrene <0.220 <0.220 3.46 <0.220 <0.220 70 1900 7800
Tetrachloroethene <0.220 <0.220 47.6 <0.220 <0.220 0.7 12 48
Toluene <0.220 <0.220 6.54 <0.220 <0.220 600 3800 16000
1,1,1-Trichloroethane <0.160 <0.160 0.542 <0.160 <0.160 200 1500 6200
Trichloroethene <0.180 <0.180 7.33 <0.180 <0.180 3 1 4.4
1,3,5-Trimethylbenzene <0.180 <0.180 290 <0.180 <0.180 400 35 150
o-Xylene <0.210 <0.210 113 <0.210 <0.210 500 98 410
m,p-Xylene <0.420 <0.420 310 <0.420 <0.420 500 71 300
Xylene (Total)<0.21 <0.21 423 <0.21 <0.21 500 77 320
Naphthalene <11.7 <9.69 49.6 <8.59 <7.88 6.0 4.6 20
Arsenic (Total) 6.0 J <5 <5 <5 <28 10 --- ---
Arsenic (Dissolved)<28 <28 <28 <28 <28 10 --- ---
Barium (Total) 175 21 13 57 67 700 --- ---
Barium (Dissolved) 82 54 39 J 46 J 44 J 700 --- ---
Cadmium (Total) 0.5 JB <0.2 <0.2 <0.2 2.5 J 2 --- ---
Cadmium (Dissolved)<1.5 <1.5 <1.5 <1.5 <1.5 2 --- ---
Chromium (Total)<3 <3 <3 <3 222 10 --- ---
Chromium (Dissolved)<19 <19 <19 <19 93 10 --- ---
Lead (Total)38 <2 <2 <2 <12 15 --- ---
Lead (Dissolved)34 <12 <12
<12 <12 15 --- ---
Residential Cumulative Calculated
Hazard Quotient N/A N/A N/A
Residential Cumulative Calculated
Carcinogenic Risk N/A N/A N/A
Non-Residential Cumulative
Calculated Hazard Quotient N/A N/A N/A
Non-Residential Cumulative
Calculated Carcinogenic Risk N/A N/A N/A
Notes:Created by : GP 7/9/2022 Checked by: JM 7/14/2022
NCDEQ = North Carolina Department of Environmental Quality
BOLD = exceeds NCDEQ 2L Standard
ITALICS = exceed Residential Vapor Intrusion Groundwater Screening Levels
UNDERLINED = exceeds NCDEQ Non-Residential Vapor Intrusion Groundwater Screening Levels
ug/L = micrograms per liter
NCDEQ 15A NCAC 02L .0202 Groundwater Standards (April 1, 2022)
NCDEQ Non-Residential Vapor Intrusion Groundwater Screening Levels (January 2022)
ft bgs= feet below ground surface
NE = Not Established
J = estimated value below laboratory reporting limits but above method detection limits
'Hazard Quotient and Carcinogenic Risk obtained utililizing NCDEQ Vapor Intrusion Screening Level Calculator (Januarry 2022)
Target Carcinogenic Risk = 1E-06 individual, 1E-04 cumulative
Target Hazard Quotient = 0.2 individual, 1 cumulative
1.0E+01
2.9E-04
2.4E+00
6.7E-05
SVOCs by EPA 8270E
RCRA Metals by EPA 6020B/7471B
Constituent
VOCs by EPA 8260D
Table 3: Summary of Groundwater Analytical Results
Patterson Avenue Property, Winston-Salem, NC
Geo-Hydro Project Number 221862.30
(ug/L) (ug/L)
Brownfields Project ID 25071-21-034
SSV-1 SSV-2 SSV-3
SSV-DUP-1
(Duplicate
of SSV-1)
NCDEQ Residential
Soil Gas Screening
Level
NCDEQ Non-
Residential Soil Gas
Screening Level
Date Collected 5/26/22 5/26/22 5/26/22 5/26/22 --- ---
Sample Depth (ft bgs)0.5 0.5 0.5 0.5
Acetone 145 48.9 209 148 --- ---
Benzene 3.51 1.84 8.41 3.42 12 160
1,3-Butadiene 3.27 <0.328 8.02 3.32 3.1 41
Carbon Disulfide 1.36 J 0.919 J 13.3 1.47 J 4900 61000
Carbon Tetrachloride <0.155 6.12 <0.155 <0.155 16 200
Chloroethane <0.164 <0.164 0.475 J <0.164 28000 350000
Chloroform 4.5 <0.0864 7.19 4.5 4.1 53
Cyclohexane 4.27 <0.161 9.48 4.24 42000 530000
Dichlorodifluoromethane 3.69 3.47 3.26 3.39 700 8800
Ethylbenzene 7.49 6.56 11.3 7.63 37 490
4-Ethyltoluene (Ethylmethyl Benzene) 9.3 8.64 11.2 9.07 --- ---
Heptane 3.66 6.61 17.7 3.81 2800 35000
n-Hexane 4.18 9.72 13.2 4.16 4900 61000
2-Hexanone 4.04 <0.285 13.6 3.88 210 2600
Isopropyl Alcohol (Isopropanol) 7.08 B 4.23 JB 29.4 8.61 B 1400 18000
Methyl Ethyl Ketone (MEK) 25.2 4.19 55.5 25 35000 440000
4-Methyl-2-Pentanone 1.96 J 0.418 J 8.36 1.93 J 21000 260000
Methylene Chloride 3.08 2.34 3.21 1.75 3400 53000
Naphthalene 10.9 9.2 3.6 10.5 2.8 36
Propene 18.5 11.2 56.6 17.7 21000 260000
Styrene 0.797 J 0.545 J 1.05 J 0.618 J 7000 88000
Tetrachloroethene 2.87 JB 0.726 JB 14.8 2.76 JB 280 3500
Tetrahydrofuran 0.495 J <0.107 2.11 0.56 J --- ---
Toluene 15.4 12.9 28.9 15.4 35000 440000
Trichlorofluoromethane 2.11 J 1.71 J 1.03 J 2.14 J --- ---
1,2,4-Trimethylbenzene 51.50 47.7 43.5 50.1 420 5300
1,3,5-Trimethylbenzene 11.8 11.1 10.9 11.6 420 5300
o-Xylene 18.60 17 23.9 18.4 700 8800
m,p-Xylene 34.7 33.3 53.5 34.8 700 8800
Xylene (Total) 53.3 50.3 77.4 53.2 700 8800
Residential Cumulative Calculated
Hazard Quotient N/A N/A
Residential Cumulative Calculated
Carcinogenic Risk N/A N/A
Non-Residential Cumulative Calculated
Hazard Quotient N/A N/A
Non-Residential Cumulative Calculated
Carcinogenic Risk N/A N/A
Created by : GP 7/9/2022 Checked by: JM 7/14/2022
Notes:
Bold = exceeds residential screening level
Underlined = exceeds non-residential screening level
µg/m3 = micrograms per cubic meter
ft bgs = feet below ground surface
NCDEQ Residential and Non-Residential Vapor Intrusion Screening Levels (VISL)
J = estimated value below laboratory reporting limits but above method detection limits
N/A = Not Applicable
--- = No established value
Hazard Quotient and Carcinogenic Risk obtained utililizing NCDEQ Vapor Intrusion Screening Level Calculator (Januarry 2022)
Target Carcinogenic Risk = 1E-06 individual, 1E-04 cumulative
Target Hazard Quotient = 0.2 individual, 1 cumulative
Table 4: Summary of Sub-Slab Soil Gas Analytical Results
Patterson Avenue Property, Winston-Salem, NC
Geo-Hydro Project Number 221862.30
Constituent
(µg/m3) (µg/m
3)
Brownfields Project ID 25071-21-034
VOCs by TO-15
3.2E-01
9.7E-06
2.5E-02
7.4E-07
SG-1 SG-2 SG-3 SG-4
NCDEQ Residential
Soil Gas Screening
Level
NCDEQ Non-
Residential Soil Gas
Screening Level
Date Collected 5/26/22 5/26/22 5/26/22 5/26/22 --- ---
Sample Depth (ft bgs)5 5 5 5
Acetone 16 15.8 21.2 16.7 --- ---
Benzene 1.74 1.54 J 4.63 1.07 J 12 160
Carbon Disulfide 17.1 25.6 40.2 18.4 4900 61000
Carbon Tetrachloride 5.98 <0.155 <0.155 <0.155 16 200
Chloroform 3.16 5.97 5.56 6.05 4.1 53
Chloromethane 0.198 J <0.0673 <0.0673 <0.0673 630 7900
Cyclohexane 4.69 <0.161 <0.161 <0.161 42000 530000
1,3-Dichlorobenzene 0.884 J 1.48 J 0.649 J 0.541 J --- ---
1,4-Dichlorobenzene 0.818 J <0.186 <0.186 <0.186 8.5 110
Dichlorodifluoromethane 3.67 3.52 3.88 4.78 700 8800
cis-1,2-Dichloroethene 0.92 J <0.0955 <0.0955 2.86 --- ---
trans-1,2-Dichloroethene 0.325 J <0.108 <0.178 <0.108 280 3500
1,2-Dichloropropane 5.31 7.2 7.99 4.01 25 330
Ethyl Acetate 3.93 5.03 8.08 5.94 56 6100
Ethylbenzene 5.44 3.48 5.02 3.54 37 490
4-Ethyltoluene (Ethylmethyl Benzene) 0.944 J 0.546 J 0.605 J 0.398 J --- ---
1,1,2-Trichloro-1,2,2-trifluoroethane 0.935 J <0.561 <0.561 <0.561 35000 44000
Heptane 1.27 J 1.43 J 6.94 1.22 J 2800 35000
n-Hexane 1.71 J 1.96 4.86 10.6 4900 61000
2-Hexanone 0.643 J <0.285 <0.285 0.827 J 210 2600
Isopropyl Alcohol (Isopropanol) 37.8 4.18 JB 3.85 JB 4.31 JB 1400 18000
Methyl Ethyl Ketone (MEK) 2.57 3.17 4.02 2.9 35000 440000
Methyl tert-butyl ether (MTBE) 1.31 J <0.0336 <0.0336 <0.0336 360 4700
4-Methyl-2-Pentanone 0.737 J 0.496 J 0.705 J 0.619 J 21000 260000
Methylene Chloride 7.63 7.99 8.49 28.9 3400 53000
Naphthalene 3.04 5.92 2.9 2.96 2.8 36
Propene 1.76 <0.242 <0.242 <0.242 21000 260000
Tetrachloroethene 190 291 138 138 280 3500
Tetrahydrofuran 1.35 J 0.784 J 1.09 J 0.77 J --- ---
Toluene 85.4 68.5 126 48 35000 440000
1,1,1-Trichloroethane 0.818 J <0.144 <0.144 <0.144 35000 440000
Trichlorofluoromethane 24.2 16.6 19.1 19.9 --- ---
1,2,4-Trimethylbenzene 4.10 1.85 J 2.45 J 1.77 J 420 5300
1,3,5-Trimethylbenzene 1.54 J 0.678 J 0.757 J 0.56 J 420 5300
Vinyl Acetate 3.74 <0.224 <0.224 <0.224 1400 18000
o-Xylene 7.48 5.17 6.5 4.24 700 8800
m,p-Xylene 18 10.7 14.6 10.8 700 8800
Xylene (Total) 25.5 15.9 21.1 15 700 8800
Residential Cumulative Calculated
Hazard Quotient N/A N/A
Residential Cumulative Calculated
Carcinogenic Risk N/A N/A
Non-Residential Cumulative Calculated
Hazard Quotient N/A N/A
Non-Residential Cumulative Calculated
Carcinogenic Risk N/A N/A
Created by : GP 7/9/2022 Checked by: JM 7/14/2022
Notes:
Bold = exceeds residential screening level
Underlined = exceeds non-residential screening level
µg/m3 = micrograms per cubic meter
ft bgs = feet below ground surface
NCDEQ Residential and Non-Residential Vapor Intrusion Screening Levels (VISL)
J = estimated value below laboratory reporting limits but above method detection limits
N/A = Not Applicable
--- = No established value
Hazard Quotient and Carcinogenic Risk obtained utililizing NCDEQ Vapor Intrusion Screening Level Calculator (Januarry 2022)
Target Carcinogenic Risk = 1E-06 individual, 1E-04 cumulative
Target Hazard Quotient = 0.2 individual, 1 cumulative
Table 5: Summary of Exterior Soil Gas Analytical Results
Patterson Avenue Property, Winston-Salem, NC
Geo-Hydro Project Number 221862.30
(µg/m3)(µg/m3)
Brownfields Project ID 25071-21-034
3.6E-01
5.8E-06
2.8E-02
4.4E-07
Constituent
VOCs by TO-15

Appendix 4
VIMS Design Drawings and General Specifications
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FIGURE V1. VIMS SITE PLAN
PATTERSON AVE BROWNFIELDS VIMS DESIGN
BROWNFIELDS ID#: 25071-21-034
WINSTON-SALEM, FORSYTH COUNTY, NC
GEO-HYDRO PROJECT #: 221862.30
VIMS EXTENT FIRST
FLOOR (FINISHED
FLOOR REFERENCE
ELEVATION 85')
VIMS EXTENT SECOND
FLOOR (FINISHED
FLOOR REFERENCE
ELEVATION 100')
RETAINING WALL
SCALE AS SHOWN. BASE DRAWING OBTAINED FROM SHEET C1.0 BY LANDMARK BUILDERS
PATTERSON AVE BROWNFIELDS VIMS DESIGN
BROWNFIELDS ID#: 25071-21-034
WINSTON-SALEM, FORSYTH COUNTY, NC
GEO-HYDRO PROJECT #: 221862.30
FIGURE V2.
VAPOR INTRUSION MITIGATION SYSTEM
LAYOUT FIRST FLOOR
LEGEND
EXTENT OF VAPOR BARRIER
HORIZONTAL COLLECTION PIPING
3" PVC EXHAUST VENT VERTICAL RISER
(R-#)
PERMANENT VACUUM MONITORING POINT
(VMP-#)
TEMPORARY VACUUM MONITORING POINT
(TVMP-#)
VMP-1
VMP-2
VMP-4 VMP-5
VMP-3
TVMP-1
TVMP-2
TVMP-4
TVMP-3
R-1
R-2
R-4
R-3 !!>qNOTES
SCALE AS SHOWN. BASE STRUCTURAL
DRAWING OBTAINED FROM SHEET S-1.01 BY
STITCH DESIGN + DEVELOPMENT, LLC.
VIMS COMPONENTS ARE EXAGGERATED FOR
CLARITY.
THIS VIMS DESIGN PLAN IS INTENDED TO
PROTECT ALL ENCLOSED SPACES WITHIN THE
SUBJECT BUILDING.
20 MIL VAPOR BARRIER
REVISION DATE DESCRIPTION
0 9/27/22 FOR NCDEQ REVIEW
1 10/19/22 PIPING AND VMP REVISIONS
2 3/23/23 ADDITIONAL REVISIONS
REVISION DATE DESCRIPTION
0 9/27/22 FOR NCDEQ REVIEW
1 10/19/22 PIPING AND VMP REVISIONS
2 3/23/23 ADDITIONAL REVISIONS
PATTERSON AVE BROWNFIELDS VIMS DESIGN
BROWNFIELDS ID#: 25071-21-034
WINSTON-SALEM, FORSYTH COUNTY, NC
GEO-HYDRO PROJECT #: 221862.30
FIGURE V3.
VAPOR INTRUSION MITIGATION SYSTEM
LAYOUT SECOND FLOOR
R-5 R-6
R-7 R-8
R-9 R-10
R-12
R-11
VMP-6
VMP-7
VMP-9
VMP-11
VMP-8
VMP-10
VMP-12
TVMP-5
TVMP-7
TVMP-6
VMP-13
TVMP-8
TVMP-13
TVMP-10
VMP-14
TVMP-12
TVMP-11
TVMP-9 !!>qLEGEND
EXTENT OF VAPOR BARRIER
HORIZONTAL COLLECTION PIPING
3" PVC EXHAUST VENT VERTICAL RISER
(R-#)
PERMANENT VACUUM MONITORING POINT
(VMP-#)
TEMPORARY VACUUM MONITORING POINT
(TVMP-#)
CONTINUOUS THICKENED SLAB
8" DEEP x 12" WIDE
NOTES
SCALE AS SHOWN. BASE STRUCTURAL
DRAWING OBTAINED FROM SHEET S-1.01 BY
STITCH DESIGN + DEVELOPMENT, LLC.
VIMS COMPONENTS ARE EXAGGERATED FOR
CLARITY.
THIS VIMS DESIGN PLAN IS INTENDED TO
PROTECT ALL ENCLOSED SPACES WITHIN THE
SUBJECT BUILDING.
TVMP-14
TVMP-15
20 MIL VAPOR BARRIER
SOLID CONCRETE
RAMP ON SLAB,THICKNESS 0' AT BASE
TO 3' TOP
1 VAPOR BARRIER AND STONE BASE (TYPICAL)
2 SLOTTED SUB-SLAB VAPOR COLLECTION PIPING (TYPICAL)
3 VIMS AT WALL FOOTING (TYPICAL)
CONCRETE FLOOR SLAB
PVC END CAP
CONCRETE FLOOR SLAB
VAPOR BARRIER VAPOR BARRIER
3" SCH 40 SLOTTED PVC PIPE
IN STONE BASE
VAPOR BARRIER
4 VIMS AT COLUMN FOOTING (TYPICAL)
VAPOR BARRIER
FIGURE V4.
VAPOR INTRUSION MITIGATION SYSTEM
CROSS SECTION DETAILS #1-4
NOT TO SCALE. BASE STRUCTURAL DRAWINGS OBTAINED FROM SHEETS S-3.01 AND 3.02 BY STITCH DESIGN + DEVELOPMENT, LLC.
PATTERSON AVE BROWNFIELDS VIMS DESIGN
BROWNFIELDS ID#: 25071-21-034
WINSTON-SALEM, FORSYTH COUNTY, NC
GEO-HYDRO PROJECT #: 221862.30
REVISION DATE DESCRIPTION
0 9/30/22 FOR NCDEQ REVIEW
1 3/23/23 ADDITIONAL REVISIONS
3" CONCRETE
SIDES AND 2"
INSULATION CORE
12" SOLID
CONCRETE
PRECAST WALL
PANEL BASE
EXTERIOR GROUND SURFACE ELEVATION PLANNED TO BE AT OR
BELOW HORIZONTAL SUB-SLAB VAPOR BARRIER ELEVATION. THE
VAPOR LINER WILL BE INSTALLED AROUND SUB-GRADE VERTICAL
RETAINING WALLS.
REVISION DATE DESCRIPTION
0 9/30/22 FOR NCDEQ REVIEW
PATTERSON AVE BROWNFIELDS VIMS DESIGN
BROWNFIELDS ID#: 25071-21-034
WINSTON-SALEM, FORSYTH COUNTY, NC
GEO-HYDRO PROJECT #: 221862.30
FIGURE V5.
VAPOR INTRUSION MITIGATION SYSTEM
CROSS SECTION DETAILS #5-7
5 VIMS AT RETAINING WALL (TYPICAL)
6 VIMS AT ELEVATOR SHAFT (TYPICAL)
7 VIMS AT RETAINING OR ELEVATOR WALL (TYPICAL)
NOT TO SCALE. BASE STRUCTURAL DRAWINGS
OBTAINED FROM SHEETS S-2.02 AND 3.02 BY STITCH
DESIGN + DEVELOPMENT, LLC.
VAPOR BARRIER
VAPOR BARRIER
VAPOR BARRIER
DRAINAGE MAT (OUTER LAYER)
VAPOR BARRIER (MIDDLE LAYER)
WATERPROOFING
(INNER LAYER,
DIRECT CONTACT
WITH CONCRETE)
REVISION DATE DESCRIPTION
0 9/30/22 FOR NCDEQ REVIEW
1 3/23/23 ADDITIONAL REVISIONS
PATTERSON AVE BROWNFIELDS VIMS DESIGN
BROWNFIELDS ID#: 25071-21-034
WINSTON-SALEM, FORSYTH COUNTY, NC
GEO-HYDRO PROJECT #: 221862.30
FIGURE V6.
VAPOR INTRUSION MITIGATION SYSTEM
CROSS SECTION DETAILS #8-12
8 VENT RISER AT WALL (TYPICAL)9 VENT RISER AT COLUMN AND VAPOR COLLECTION
PIPING THROUGH THICKENED SLAB (TYPICAL)
10 VENT RISER ROOF EXHAUST (TYPICAL)
NOT TO SCALE. BASE STRUCTURAL DRAWINGS OBTAINED FROM SHEETS S-3.01 AND 3.02 BY STITCH DESIGN + DEVELOPMENT, LLC.
VAPOR BARRIER
11 PERMANENT VACUUM MONITORING POINT (TYPICAL)12 TEMPORARY VACUUM MONITORING POINT (TYPICAL)
VAPOR BARRIER
VAPOR BARRIER
CLEANOUT FLUSH
WITH SLABPVC PLUG WITH VAPOR
SAMPLING VALVE
NON-SHRINK
CEMENT GROUT MIN. 1" PVC
CONCRETE
FLOOR SLAB CONCRETE FLOOR SLAB
MIN. 1" PVC
SEAL OPENING
WITH TAPE
MIN. 12"
PENETRATION SEALED
AROUND PIPE
PENETRATION SEALED
AROUND PIPE
MIN. 18"PENETRATION SEALED
AROUND PIPE
ROOF
3" PVC
VENTILATOR
COVER
LABEL3" SCH 40 SLOTTED PVC
PIPE IN STONE BASE
3" SCH 40 SOLID PVC PIPE
WITH PIPE SLEEVE
WALL
3" SCH 40 SOLID PVC PIPE
EXHAUST VENT RISER TO
ROOFCOLUMN
MIN. 6"
PENETRATIONS SEALED
AROUND PIPES
MIN. 6"
3" SCH 40 SOLID PVC PIPE
EXHAUST VENT RISER TO
ROOF
WALLPENETRATION
SEALED AROUND
PIPE
PRECAST WALL
PANEL
VAPOR BARRIER
3" SCH 40 SLOTTED PVC
PIPE IN STONE BASE
3" SCH 40 SOLID
PVC PIPE
EXTERIOR GROUND SURFACE ELEVATION PLANNED TO BE AT OR
BELOW HORIZONTAL SUB-SLAB VAPOR BARRIER ELEVATION. THE
VAPOR LINER WILL BE INSTALLED AROUND SUB-GRADE VERTICAL
RETAINING WALLS.
EACH VENT RISER EXHAUST POINT SHALL BE AT LEAST TEN FEET
AWAY FROM ANY OPENING INTO CONDITIONED SPACES OF THE
BUILDING THAT IS LESS THAN TWO FEET BELOW THE EXHAUST POINT.

Appendix 5
VIMS Product Specifications

PRODUCT PART #
VaporBlock® Plus™ 20 ................................................................ VBP20
UNDER-SLAB VAPOR / GAS BARRIER
Under-Slab Vapor/Gas Retarder
© 2018 RAVEN INDUSTRIES INC. All rights reserved.
VAPORBLOCK® PLUS™VBP20
PRODUCT DESCRIPTION
VaporBlock® Plus™ is a seven-layer co-extruded barrier
made using high quality virgin-grade polyethylene and
EVOH resins to provide unmatched impact strength as well
as superior resistance to gas and moisture transmission.
VaporBlock® Plus™ 20 is more than 100 times less permeable
than typical high-performance polyethylene vapor retarders
against Methane, Radon, and other harmful VOCs. Tested and
verified for unsurpassed protection against BTEX, HS, TCE, PCE,
methane, radon, other toxic chemicals and odors.
VaporBlock® Plus™ 20 multi-layer gas barrier is manufactured
with the latest EVOH barrier technology to mitigate hazardous
vapor intrusion from damaging indoor air quality, and the safety
and health of building occupants. VBP20 is one of the most
effective underslab gas barriers in the building industry today
far exceeding ASTM E-1745 (Plastic Water Vapor Retarders
Used in Contact with Soil or Granular Fill Under Concrete Slabs)
Class A, B and C requirements. Available in a 20 (Class A) mil
thicknesses designed to meet the most stringent requirements.
VaporBlock® Plus™ 20 is produced within the strict guidelines
of our ISO 9001 Certified Management System.
PRODUCT USE
VaporBlock® Plus™ 20 resists gas and moisture migration
into the building envelop when properly installed to provide
protection from toxic/harmful chemicals. It can be installed as
part of a passive or active control system extending across the
entire building including floors, walls and crawl spaces. When
installed as a passive system it is recommended to also include
a ventilated system with sump(s) that could be converted to an
active control system with properly designed ventilation fans.
VaporBlock® Plus™ 20 works to protect your flooring and
other moisture-sensitive furnishings in the building’s interior
from moisture and water vapor migration, greatly reducing
condensation, mold and degradation.
SIZE & PACKAGING
VaporBlock® Plus™ 20 is available in 10’ x 150’ rolls to
maximize coverage. All rolls are folded on heavy-duty cores
for ease in handling and installation. Other custom sizes
with factory welded seams are available based on minimum
volume requirements. Installation instructions and ASTM E-1745
classifications accompany each roll.
APPLICATIONS
Radon Barrier
Methane Barrier
VOC Barrier
Brownfields Barrier
Vapor Intrusion Barrier
Under-Slab Vapor Retarder
Foundation Wall Vapor Retarder
VaporBlock® Plus™ is a seven-layer co-extruded barrier made using high quality virgin-grade polyethylene and EVOH resins to provide unmatched impact strength as well as superior resistance to gas and moisture transmission.
VaporBlock® Plus™ Placement
All instructions on architectural or structural drawings should be reviewed and followed.
Detailed installation instructions accompany each roll of VaporBlock® Plus™ and can also be located at www.ravenefd.com.
ASTM E-1643 also provides general installation information for vapor retarders.
VAPORBLOCK® PLUS™ 20
PROPERTIES TEST METHOD IMPERIAL METRIC
AppeArAnce White/Gold
Thickness, nominAl 20 mil 0.51 mm
WeighT 102 lbs/MSF 498 g/m²
clAssificATion ASTM E 1745 CLASS A, B & C
³ Tensile sTrengTh
ASTM E 154Section 9(D-882)58 lbf 102 N
impAcT resisTAnce ASTM D 1709 2600 g
permeAnce (neW mATeriAl)
ASTM E 154Section 7ASTM E 96Procedure B
0.0098 Perms
grains/(ft²·hr·in·Hg)
0.0064 Perms
g/(24hr·m²·mm Hg)
permeAnce (AfTer condiTioning)
(sAme meAsuremenT As Above permeAnce)
ASTM E 154Section 8, E96Section 11, E96Section 12, E96Section 13, E96
0.00790.00790.00970.0113
0.00520.00520.00640.0074
WvTr ASTM E 96Procedure B 0.0040 grains/hr-ft²0.0028 gm/hr-m²
benzene permeAnce See Note ⁶1.13 x 10-¹⁰ m²/sec or 3.62 x 10-¹³ m/s
Toluene permeAnce See Note ⁶1.57 x 10-¹⁰ m²/sec or 1.46 x 10-¹³ m/s
eThylbenzene permeAnce See Note ⁶1.23 x 10-¹⁰ m²/sec or 3.34 x 10-¹⁴ m/s
m & p-Xylenes permeAnce See Note ⁶1.17 x 10-¹⁰ m²/sec or 3.81 x 10-¹⁴ m/s
o-Xylene permeAnce See Note ⁶1.10 x 10-¹⁰ m²/sec or 3.43 x 10-¹⁴ m/s
hydrogen sulfide See Note 9 1.92E-⁰⁹ m/s
TrichloroeThylene (Tce) See Note ⁶7.66 x 10-¹¹ m²/sec or 1.05 x 10-¹⁴ m/s
perchloroeThylene (pce)See Note ⁶7.22 x 10-¹¹ m²/sec or 1.04 x 10-¹⁴ m/s
rAdon diffusion coeffiecienT K124/02/95 < 1.1 x 10-13 m2/s
meThAne permeAnce ASTM D 1434 3.68E-¹² m/sGas Transmission Rate (GTR):0.32 mL/m²•day•atm
mAXimum sTATic use TemperATure 180° F 82° C
minimum sTATic use TemperATure - 70° F - 57° C
UNDER-SLAB VAPOR / GAS BARRIER
VAPORBLOCK® PLUS™VBP20
© 2018 RAVEN INDUSTRIES INC. All rights reserved.
Scan QR Code to download
current technical data sheets
via the Raven website.
Note: To the best of our knowledge, unless otherwise stated, these are typical property values and are intended as guides only, not as specification limits. Chemical resistance, odor transmission, longevity as well as other performance criteria is not implied or given and actual testing must be performed for applicability in specific applications and/or conditions. RAVEN INDUSTRIES MAKES NO WARRANTIES AS TO THE FITNESS FOR A SPECIFIC USE OR MERCHANTABILITY OF PRODUCTS REFERRED TO, no guarantee of satisfactory results from reliance upon contained information or recommendations and disclaims all liability for resulting loss or damage. Limited Warranty available at www.RavenEFD.com
061318 EFD 1125
RAVEN ENGINEERED FILMSP.O. Box 5107 Sioux Falls, SD 57117-5107Ph: [phone] • TF: [phone] [e-mail]
³ Tests are an average of machine and transverse directions.5 Raven Industries performs seam testing at 20” per minute.6 Aqueous Phase Film Permeance. Permeation of Volatile Organic Compounds through EVOH Thin Film Membranes and Coextruded LLDPE/EVOH/
LLDPE Geomembranes, McWatters and Rowe, Journal of Geotechnical and Geoenvironmental Engineering© ASCE/
September 2015. (Permeation is the Permeation Coefficient adjusted to actual film thickness - calculated at 1 kg/m³.)
The study used to determine PCE and TCE is titled: Evaluation of diffusion of PCE & TCE through high performance geomembranes by Di
Battista and Rowe, Queens University 8 Feb 2018.9 The study used to determine diffusion coefficients is titled: Hydrogen Sulfide (H₂S) Transport through Simulated Interim Covers with Conventional and Co-Extruded Ethylene-Vinyl Alcohol (EVOH) Geomembranes.
INSTALLATION GUIDELINES - With VaporSeal™ Tape
VaporSeal™
4” Tape
VaporSeal™ 4” Tape Optional Butyl Seal
2-Sided Tape
Gas Barrier Applications
Elements of a moisture/gas-resistant floor system. General illustration only.(Note: This example shows multiple options for waterstop placement.
VaporSeal™
4” Tape
VaporSeal™ 4” Tape Optional Butyl Seal
2-Sided Tape
Gas Barrier Applications
Fig. 2: VaporBlock® Plus™ Overlap Joint Sealing Methods
Fig. 1: VaporBlock® Plus™ Overlapping Roll-out Method
Please Note: Read these instructions thoroughly before installation to ensure proper use of VaporBlock® Plus™. ASTM E 1465, ASTM E 2121 and, ASTM E 1643 also provide valuable information regarding the installation of vapor / gas barriers. When installing this product, contractors shall conform to all applicable local, state and federal regulations and laws pertaining to residential and commercial building construction.
• When VaporBlock® Plus™ gas barrier is used as part of an active control system for radon or other gas, a ventilation system will be required.
• If designed as a passive system, it is recommended to install a ventilation system that could be converted to an active system if needed.
Materials List:VaporBlock® Plus™ Vapor / Gas BarrierVaporSeal™* 4” Seaming TapeVaporSeal™* 12” Seaming/Repair TapeButyl Seal 2-Sided TapeVaporBoot Plus Pipe Boots 12/Box (recommended)VaporBoot Tape (optional)POUR-N-SEAL™ (optional)1” Foam Weather Stripping (optional)Mako® Screed Supports (optional)
VAPORBLOCK® PLUS™ PLACEMENT
1.1. Level and tamp or roll granular base as specified. A base for a gas-reduction system may require a 4” to 6” gas permeable layer of clean coarse aggregate as specified by your architectural or structural drawings after installation of the recommended gas collection system. In this situation, a cushion layer consisting of a non-woven geotextile fabric placed directly under VaporBlock® Plus™ will help protect the barrier from damage due to possible sharp coarse aggregate.
1.2. Unroll VaporBlock® Plus™ running the longest dimension parallel with the direction of the pour and pull open all folds to full width. (Fig. 1)
1.3. Lap VaporBlock® Plus™ over the footings and seal with Raven Butyl Seal tape at the footing-wall connection. Prime concrete surfaces, when necessary, and assure they are dry and clean prior to applying Raven Butyl Seal Tape. Apply even and firm pressure with a rubber roller. Overlap joints a minimum of 6” and seal overlap with 4” VaporSeal™ Tape. When used as a gas barrier, overlap joints a minimum of 12” and seal in-between overlap with an optional 2-sided Raven Butyl Seal Tape. Then seal with 4” VaporSeal™ Tape centered on the overlap seam. (Fig. 2)
Page 1 of 4 Top original diagram and figure #1 were reprinted with permission by the Portland Cement Association.Reference: Kanare, Howard M., Concrete Floors and Moisture, EB119, Portland Cement Association, Skokie, Illinois, and National Ready Mixed Concrete Association, Silver Spring, Maryland, USA, 2008, 176 pages.
1.4. Seal around all plumbing, conduit, support columns or other penetrations that come through the VaporBlock® Plus™ membrane.
1.4a. Method 1: Pipes four inches or smaller can be sealed with Raven VaporBoot Plus preformed pipe boots. VaporBoot Plus preformed pipe boots are formed in steps for 1”, 2”, 3” and 4” PVC pipe or IPS size and are sold in units of 12 per box (Fig. 3 & 5).
Pipe boots may also be fabricated from excess VaporBlock® Plus™ membrane (Fig. 4 & 6) and sealed with VaporBoot Tape or VaporSeal™ Tape (sold separately).
1.4b. Method 2: To fabricate pipe boots from VaporBlock® Plus™ excess material (see Fig. 4 & 6 for A-F):
A) Cut a square large enough to overlap 12” in all directions.
B) Mark where to cut opening on the center of the square and cut four to eight slices about 3/8” less than the diameter of the pipe.
C) Force the square over the pipe leaving the tightly stretched cut area around the bottom of the pipe with approximately a 1/2” of the boot material running vertically up the pipe. (no more than a 1/2” of stretched boot material is recommended)
D) Once boot is positioned, seal the perimeter to the membrane by applying 2-sided Raven Butyl Seal Tape in between the two layers. Secure boot down firmly over the membrane taking care not to have any large folds or creases.
E) Use VaporBoot Tape or VaporSeal™ Tape to secure the boot to the
pipe.
VaporBoot Tape (option) – fold tape in half lengthwise, remove half of the release liner and wrap around the pipe allowing 1” extra for overlap sealing. Peel off the second half of the release liner and work the tape outward gradually forming a complete seal.
VaporSeal™ Tape (option) - Tape completely around pipe overlapping the VaporBlock® Plus™ square to create a tight seal against the pipe.
F) Complete the process by taping over the boot perimeter edge with VaporSeal™ Tape to create a monolithic membrane between the surface of the slab and gas/moisture sources below and at the slab perimeter. (Fig. 4 & 6)
Preformed Pipe Boot Square Material Pipe Boot
Fig. 3
SINGLE PENETRATION PIPE BOOT INSTALLATION
Fig. 5 Fig. 6
1. Cut a square of VaporBlock® Plus™ barrier to extend at least 12” from the pipe in all directions.
2. Cut four to eight slices about 3/8” less than the diameter of the pipe.
5. Use Raven VaporBoot or VaporSeal™ Tape and overlap 1” at the seam.
4. Tape over the boot perimeter edge with VaporSeal™ Tape.
1. Cut out one of the preformed boot steps (1” to 4”).
2. Tape the underside boot perimeter with 2-sided Butyl Seal Tape.
3. Force the boot over pipe and press tape firmly in place.
4. Use VaporSeal™ Tape
to secure boot to the pipe.
5. Tape around entire boot edge with VaporSeal™ Tape.
VaporBoot Flexible Tapeor VaporSeal™ 4” TapeVaporSeal™ 4” Tape
VaporBlock® Plus™Material
VaporSeal™ 4” Tape
Raven Butyl Seal2-Sided Tape Raven Butyl Seal2-Sided Tape
VaporBoot PlusPreformed Boot 12”(minimum)
3. Force over pipe and tape the underside boot perimeter to existing barrier with 2-sided Butyl Seal Tape.
Fig. 4
Page 2 of 4 Original figure #4 diagram is reprinted with permission by the Portland Cement Association.Reference: Kanare, Howard M., Concrete Floors and Moisture, EB119, Portland Cement Association, Skokie, Illinois, and National Ready Mixed Concrete Association, Silver Spring, Maryland, USA, 2008, 176 pages.Method 1
Method 2
VaporSeal™4” Tape VaporBoot PlusPerformed Boot
Raven Butyl Seal 2-sided Tape Raven Butyl Seal 2-sided Tape
1.5. Sealing side-by-side multiple penetrations (option 1);
A) Cut a patch large enough to overlap 12” in all directions (Fig. 7)
of penetrations.
B) Mark where to cut openings and cut four to eight slices about
3/8” less than the diameter of the penetration for each.
C) Force patch material over penetration to achieve a tight fit and
form a lip.
D) Once patch is positioned, seal the perimeter to the membrane
by applying 2-sided Raven Butyl Seal Tape in-between the two
layers. (Fig. 8)
E) After applying Raven Butyl Seal Tape between the patch and
membrane, tape around each of the penetrations and the patch
with VaporSeal™ 4” tape. (Fig. 9) For additional protection apply
POUR-N-SEAL™ or an acceptable polyurethane elastomeric
sealant around the penetrations. (Fig. 10)
Fig. 7 Fig. 8
Fig. 9 Fig. 10
MULTIPLE PENETRATION PIPE BOOT INSTALLATION
Fig. 6
Cut a patch large enough to overlap 12” in all directions and slide over penetrations (Make openings as tight as possible.)
Once the overlay patch is positioned, seal the perimeter to the membrane by applying 2-sided Raven Butyl Seal Tape in-between the two layers.
After applying Raven Butyl Seal Tapebetween the patch and membrane, tape around the perimeter of the penetration and the patch with VaporSeal™ 4” Tape.
For additional protection apply POUR-N-SEAL™ or an acceptable polyurethane elastomeric sealant around the penetrations.
VaporSeal™ 4” Tape VaporSeal™ 4” Tape
Page 3 of 4
Option 1
Raven Butyl Seal 2-sided Tape
1.6. POUR-N-SEAL™ method of sealing side-by-side multiple penetrations (option 2);
A) Install the vapor barrier as closely as possible to pipe penetrations to minimize the amount of POUR-N-SEAL™ necessary to seal around all penetrations.
B) Once barrier is in place, remove soil or other particles with a dry cloth or a fine broom to allow for improved adhesion to the POUR-N-SEAL™ liquid.
C) Create a dam around the penetration area approximately 2” away from the pipe or other vertical penetrations by removing the release liner from the back of a 1” weather stripping foam and adhere to the vapor barrier. Form a complete circle to contain the POUR-N-SEAL™ materials (Fig. 11).
D) Once mixed, pour contents around the pipe penetrations. If needed, a brush or a flat wooden stick can be used to direct the sealant completely around penetrations creating a complete seal (Fig. 12-13).
E) DO NOT leave excess POUR-N-SEAL™ in plastic container for longer than the time it takes to pour sealant.
Fig. 12 Fig. 13
Fig. 11
Option 2
VAPORBLOCK® PLUS™ REPAIR INSTRUCTIONS
1.7. Proper installation requires all holes and openings are repaired prior
to placing concrete. When patching small holes, simply cut a 12” long
piece of 12” wide VaporSeal™ tape. Remove release liner and center
over the opening. Apply pressure to create a seal (Fig. 14-15).
1.8. When installing VaporBlock® Plus™ around pipe penetrations,
vertical columns, electrical ducts and other obstructions, you will
find it necessary to cut it to the nearest outside edge. This cut can
be easily sealed with 12” wide VaporSeal™ tape, by simply centering
it over the cut, 6” on either side. Once the tape is placed correctly,
apply pressure to assure a complete seal (Fig. 16).
Reminder Note: All holes or penetrations through the membrane will need
to be patched with 12” VaporSeal™ Tape.
Fig. 14
Page 4 of 5
Fig. 15
2.1. When installing reinforcing steel and utilities, in addition to the
placement of concrete, take precaution to protect VaporBlock®
Plus™. Carelessness during installation can damage the most
puncture–resistant membrane. Sheets of plywood cushioned with
geotextile fabric temporarily placed on VaporBlock® Plus™ provide
for additional protection in high traffic areas including concrete
buggies.
2.2. Use only brick-type or chair-type reinforcing bar supports to protect
VaporBlock® Plus™ from puncture.
2.3. Avoid driving stakes through VaporBlock® Plus™. If this cannot be
avoided, each individual hole must be repaired per section 1.7.
2.4. To avoid penetrating VaporBlock® Plus™ when installing screed
supports, utilize non-penetrating support, such as the Mako®
Screed Support System (Fig. 17). Avoid driving stakes through
VaporBlock® Plus™. If this cannot be avoided, each individual hole
must be repaired per figures 14-15.
2.5. If a cushion or blotter layer is required in the design between
VaporBlock® Plus™ and the slab, additional care should be given if
sharp crushed rock is used. Washed rock will provide less chance of
damage during placement. Care must be taken to protect blotter layer
from precipitation before concrete is placed.
VaporBlock® Plus™ Gas & Moisture Barrier can be identified on site
as gold/white in color printed in black ink with following logo and
classification listing (Fig. 18)
Page 5 of 5
VaporBlock® Plus™
Gas & Moisture Barrier
Note: To the best of our knowledge, unless otherwise stated, these are typical property values and are intended as guides only, not as specification limits. Chemical resistance, odor transmission, longevity as well as other performance criteria is not implied or given and actual testing must be performed for applicability in specific applications and/or conditions. RAVEN INDUSTRIES MAKES NO WARRANTIES AS TO THE FITNESS FOR A SPECIFIC USE OR MERCHANTABILITY OF PRODUCTS REFERRED TO, no guarantee of satisfactory results from reliance upon contained information or recommendations and disclaims all liability for resulting loss or damage. Limited Warranty available at wwww.RavenEFD.com
ENGINEERED FILMSP.O. Box 5107 Sioux Falls, SD 57117-5107Ph: [phone] • TF: [phone]
[e-mail]
020316 EFD 1127
VAPORBLOCK® PLUS™ PROTECTION
Fig. 16
Fig. 18
Fig. 17
* Patent Pending
© Raven 2016. All Rights Reserved.
Overall Height7 3/4"Head Diameter 7 1/2"** OutsideLouvers4"* InsideLouvers4"PVC Opening 3 1/2"Vent Opening 4"PVC Height1"Active Ventilation Products, Inc.Website: roofvents.com Email: [e-mail] SheetAura PVC Pipe Cap Model: AV-3-PVC Diameter: 3"9/7/2022- Aluminum Alloy 3000 Series- Minimum Thickness = 0.025"- Designed to fit onto PVC pipes schedule 40 & 80* Inside Louver Opening = 1/8"** Outside Louver Opening = 1/4"
EVECO VENTILATOR
APPROX.EXHAUST
WEIGHT CAPACITY
SIZE GALV.COPPER PACKED 4-MIWIND
(inches)(gauge)(ounces)(pounds)(CFM)
4 26-28 16 3 40
5 26-28 16 3 45
6 26-28 16 3 50
7 26-28 16 4 60
8 26-28 16 4 75
9 26-28 16 5 100
10 26-28 16 5 120
12 26 16 6 170
14 24-26 16 9 280
15 24-26 16 10 325
16 24-26 16 10 375
IB 24-26 16-20 12 450
20 24-26 16-20 14 580
24 22-24 16-20 24 750
30 22-24 16-20 48 1100
36 22-24 20-24 90 1600
The Eveco Ventilator is a single cone
vent, ideal for low cost ventilation.
Thoughthe cost ofthis unit isslight,
itprovides maximum ventilation in ail
types of weather.
SYPHON VENTILATOR
The Empire Syphon Ventilator is a
dependable stationary exhauster
that functions efficiently in the
slightest breeze,its design utilizes
every wind current to create a pow
erful suction through the stack,while
the storm band circling the upper
cone prevents rain from driving into
the ventilator and adds to its exhaust
capacity.Air outlet is more than dou
ble that of the stack area.
APPROX.EXHAUST
WEIGHT CAPACITY
SIZE GALV.COPPER PACKED 4-MIWIND
(Inches)(gauge)(ounces)(pounds)(CFM)
4 26-28 16 7 65
5 26-28 16 7 70
6 26-28 16 8 75
7 26-28 16 9 85
8 26-28 16 10 105
9 26-28 16 11 140
10 26-28 16 12 190
12 26 16 15 275
14 24-26 16-20 21 380
15 24-26 16-20 25 450
16 24-26 16-20 30 500
18 24-26 16-20 35 620
20 22-24 20 45 740
24 22-24 20-24 70 1010
Empire Ventilation Equipment Co.,Inc.
35-39 Vernon Boulevard
Long Island City, NY 11106-5195
TEL:[phone]
FAX:[phone]
EMPIRE
SPECIFICATION
Sioux Chief 834 series FinishLine adjustable on-grade cleanout shall be
used where necessary in drainage systems. Cleanout shall allow adjustment
before and AFTER the concrete pour. Scoriated cleanout cover shall meet
applicable load requirements for intended use. Cleanout shall include a slotted,
polypropylene or brass cleanout plug, situated in base adapter.
Designed in accordance with ASME A112.36.2M
MATERIALS
Ring/cover: Nickel-bronze, 304 stainless steel
Coring plug: High-impact polymer
Coring sleeve: ABS
Head adapter: ABS
Base adapter: ABS, PVC
Cleanout plug: Polypropylene, brass
LOAD RATING
4,000 lbs. (medium-duty)
DIMENSIONS
A:Connection 3" Sch. 40 Hub1, 4" Sch. 40 Hub
B:Ring/cover diameter Rnd: 6-1/2" Sqr: 6-5/8"
C:Base adapter height 4-1/2"
D:Pre-pour height 5-3/8" - 6-5/8"
E:After-pour height Rnd: 0" - 1-1/4" Sqr: 5/16" - 1-1/4"
F:Cleanout plug 3-1/2" slotted
1 Fits inside most 4" Sch. 40 pipe
Sioux Chief Manufacturing Company | P: 1.800.821.3944 | F: 1.800.758.5950 | www.siouxchief.com 04-22
834 SERIES
Create Item Number
ADJUSTABLE FLOOR CLEANOUT
ITEM # SUBMITTED �����������������������������������������
JOB NAME �����������������������������������������������
LOCATION �����������������������������������������������
ENGINEER �����������������������������������������������
CONTRACTOR ��������������������������������������������
PO# ������������������������TAG ������������������������
834-A B C D
e.g. 834-4PNRV: FinishLine cleanout with 4" PVC Sch. 40 hub and round, nickel-bronze, vandal-resistant ring/cover
B
D
A
3 = 3" Sch. 40 Hub
4 = 4" Sch. 40 Hub
CONNECTION SIZE A Available separately:
Leveling shim kit: (832-4)
Extension adapter: (832-EX4)
Flexible locating bristle kit: (832-W)
FinishLine plug wrench: (832-P)
NR = Round nickel-bronze
NQ = Square nickel-bronze
SR = Round stainless steel
SQ = Square stainless steel
RING/COVER C
FinishLine™
2 In lieu of polypro (standard) 3 Available for items with round nickel-bronze covers only
834-4PNR
E
C
F
A = ABS Base adapter
P = PVC Base adapter
CONNECTION TYPE B
V = Vandal-resistant cover screws
S = Stamping: specify letters
C = Carpet marker
B = Brass cleanout plug2
Z = Complies with Buy American Act3
OPTIONS D
Rn 4EC-4 Inline Radon Fan

Technical parameters
Norminal data
Voltage (nominal)120 V
Frequency 60 Hz
Phase(s)1~
Input power 169 W
Input current 2.1 A
Radon Fan, Inline, 4.5" Pipe, 4.25" max SP
Item Number: 99923
Variant: 120V 1~ 60Hz
• Use for High Suction, High Airflow applications
• Equipped with EC Motor
• Speed Control Included
• LDVI™ Couplings Included
• Airtight Housing Guaranteed
• Large Electrical Box
• Zero Leakage
Active radon mitigation systems employ specialized fans to exhaust
radioactive radon gas from underneath building structures via a sealed
pipe system. These systems are designed to remove radon gas before it
migrates into the building envelope.
As the most powerful model in Fantech’s family of Radon Mitigation
fans, the Rn4EC can create 4.3” of suction while moving 20 cfm, as well
as move 490 cfm when operating at only 0.5” of suction. High air flow,
high suction.
Rn4EC features an electronically commutated (EC) motor. Inherently
efficient and operationally stable at full and reduced speeds, the EC
motor arms the radon professional with installation methods not
previously practical. Integrated control system allows for “dialling in” the
fan speed necessary to achieve either the required sub-slab
depressurization or required system air flow rate. For demand-controlled
systems, the potentiometer can be removed from the wiring terminal
block to accommodate an externally-provided 0-10Vdc speed command.
The Rn 4-4EC is constructed with UL certified, UV protected polycarbonate material. The inlet and outlet pieces of the fan’s housing are vibration welded for
100% leak-proof housing construction. Totally enclosed motors are designed with extra moisture protection in various radon applications.
Performance certified by HVI; safety certified by UL.

Item name: Rn 4EC-4 Inline Radon Fan | Item Number: 99923 | Variant: 120V 1~ 60Hz | Document type: Product card | Date: 2020-10-08 | Generated by: fantech Online
Catalogue | Language: English
Page 1 of 6
Impeller speed 4,084 r.p.m.
Air flow max 555 cfm
Protection/Classification
Enclosure class, motor IP54
Insulation class B
Certificate HVI, cULus
Dimensions and weights
Weight 7.3 lb
Item name: Rn 4EC-4 Inline Radon Fan | Item Number: 99923 | Variant: 120V 1~ 60Hz | Document type: Product card | Date: 2020-10-08 | Generated by: fantech Online
Catalogue | Language: English
Page 2 of 6
Performance curve
0 40 80 120 160 200 240 280 320 360 400 440 480 520 cfm
0
1
2
3
4
in. wg.
Hydraulic data
Required air flow -
Required static pressure -
Working air flow -
Working static pressure -
Air density 0.075 lb/ft³
Power -
Fan control - RPM -
Current -
SFP -
Control voltage -
Supply voltage -
Item name: Rn 4EC-4 Inline Radon Fan | Item Number: 99923 | Variant: 120V 1~ 60Hz | Document type: Product card | Date: 2020-10-08 | Generated by: fantech Online
Catalogue | Language: English
Page 3 of 6
Dimensions
Model A B C D E F G
Rn2EC​4 15/32 (114)10 (254)1 1/4 (32)9 1/4 (235)---
Rn4EC-3 5 7/8 (149)11 1/2 (292)1 1/4 (32)9 1/4 (235)4 (102)3 1/2 (89)6 (152)
Rn4EC-4 5 7/8 (149)11 1/2 (292)1 1/4 (32)9 1/4 (235)4 (102)4 1/2 (114)6 (152)
Dimensions in inches (mm).
Item name: Rn 4EC-4 Inline Radon Fan | Item Number: 99923 | Variant: 120V 1~ 60Hz | Document type: Product card | Date: 2020-10-08 | Generated by: fantech Online
Catalogue | Language: English
Page 4 of 6
Wiring
Item name: Rn 4EC-4 Inline Radon Fan | Item Number: 99923 | Variant: 120V 1~ 60Hz | Document type: Product card | Date: 2020-10-08 | Generated by: fantech Online
Catalogue | Language: English
Page 5 of 6
Documents
142001 Rn2EC-Rn4-EC OIPM EN FR.PDF
Item name: Rn 4EC-4 Inline Radon Fan | Item Number: 99923 | Variant: 120V 1~ 60Hz | Document type: Product card | Date: 2020-10-08 | Generated by: fantech Online
Catalogue | Language: English
Page 6 of 6