23055-Battery & Igntion_VIMS_R1 20210903

Via Email
September 3, 2021 NCDEQ – Division of Waste Management Brownfields Program
1646 Mail Service Center Raleigh, NC 27699-1646 Attn: Ms. Carolyn Minnich

Re: Vapor Intrusion Mitigation Plan Battery & Ignition Distribution Charlotte, North Carolina
Brownfields Project No. 23055-19-060 H&H Project No. PDP-001
Dear Carolyn: Please find the enclosed Vapor Intrusion Mitigation Plan (VIMP) prepared for the proposed LoSo Village Apartments redevelopment at the Battery & Ignition Distribution Brownfields property located in Charlotte, Mecklenburg County. The plan has been revised to address DEQ comments
provided on August 20, 2021. Should you have questions or need additional information, please do not hesitate to contact us at [phone].
Sincerely,
Hart & Hickman, PC
Alexis McKenzie, PE Christie Zawtocki, PE Project Engineer Principal Engineer
Enclosure cc: Mr. Ken Walsh, Proffitt Dixon Partners (via email) Ms. Martha Fakadej, JLL Project Development Services (via email)

Vapor Intrusion Mitigation Plan
LoSo Village Apartments

Battery & Ignition Distribution
Tryclan Drive and Ellenwood Place
Charlotte, North Carolina
Brownfields Project No. 23055-19-060

H&H Job No. PDP-001
Revised September 3, 2021

#C-1269 Engineering #C-245 Geology
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Vapor Intrusion Mitigation Plan LoSo Village Apartments Charlotte, North Carolina Brownfields Project No. 23055-19-060 H&H Job No. PDP-001

Table of Contents

1.0 Introduction ................................................................................................................ 1
2.0 Design Basis ................................................................................................................ 5
3.0 Quality Assurance / Quality Control ........................................................................ 8
4.0 Post-Construction System Effectiveness Testing .................................................... 9
5.0 Post-Occupancy Testing .......................................................................................... 16
6.0 Future Tenants & Building Uses ............................................................................ 17
7.0 Reporting .................................................................................................................. 18

Figures Figure 1 Site Location Map
Figure 2 Site Map
Appendices
Appendix A LoSo Village Apartments Development Plan
Appendix B Summary Tables and Sample Location Map
Appendix C Vapor Intrusion Mitigation Plan – VM-1, VM-2, VM-3, and VM-4
Appendix D Vapor Intrusion Mitigation System Product Specifications

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Vapor Intrusion Mitigation Plan LoSo Village Apartments Charlotte, North Carolina Brownfields Project No. 23055-19-060 H&H Job No. PDP-001

1.0 Introduction
On behalf of 3615 Tryclan, LP (the Prospective Developer or PD), Hart & Hickman, PC (H&H)
has prepared this Vapor Intrusion Mitigation Plan (VIMP) for installation of a vapor intrusion
mitigation system (VIMS) for the proposed LoSo Village Apartments multi-family development
at the Battery & Ignition Distribution Brownfields Property (Brownfields Project No. 23055-19-
060) located at 3615, 3621, 3631 Tryclan Drive and 3700 Ellenwood Place in Charlotte,
Mecklenburg County, North Carolina (Site). The Site consists of five contiguous parcels, the
alleyway between parcels, and land located between the Seaboard Coastline railroad. Collectively,
the Site totals approximately 6.0 acres of land located in a rapidly densifying residential and
commercial use area less than one mile east of uptown Charlotte along the LYNX Blue Line light
rail corridor. A Site location map is provided as Figure 1, and the Site and surrounding area is
shown in Figure 2.

The northwestern Site parcel (3631 Tryclan Drive) is developed with an approximate 16,000-
square foot (sq ft) commercial building that is occupied by an auto repair facility. The central Site
parcel (3621 Tryclan Drive) is developed with an approximate 6,000-sq ft commercial office and
warehouse building that is currently unoccupied. The eastern Site parcel (3615 Tryclan Drive) is
developed with an approximate 9,000-sq ft multi-tenant commercial building that is currently
occupied by retail stores. The remainder of the Site consists of grassy, landscaped, and wooded
areas, and asphalt-paved or gravel-covered parking and storage areas. Proposed redevelopment of
the Brownfields property includes razing the existing Site buildings and construction of a high-
density apartment complex with an associated parking deck and access roads. Proposed
redevelopment plans are included in Appendix A.

H&H completed Brownfields assessment activities for the Site in February 2021 to evaluate Site
surface and subsurface conditions for potential impacts. Summary tables and a sample location
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map are included in Appendix B. Results of groundwater assessment activities identified the
presence of TCE on the downgradient part of the Site at a concentration above the DEQ 2L
Standard and the DEQ DWM Residential and Non-Residential Vapor Intrusion Groundwater
Screening Levels (GWSLs). No other compounds were detected at concentrations above the 2L
Standards or DEQ DWM Vapor Intrusion GWSLs in the groundwater samples collected at the
Site.

Soil gas sample laboratory analytical results identified TCE at a concentration slightly above the
DEQ DWM Residential Vapor Intrusion Sub-slab and Exterior Soil Gas Screening Level (SGSL)
in one sample collected in the central portion of the Site. Laboratory analytical results also
identified low levels of the petroleum-related compound benzene in several soil gas samples at
concentrations above the DEQ DWM Residential Vapor Intrusion SGSL. In addition, chloroform
was detected above the DEQ DWM Residential Vapor Intrusion SGSL in one soil gas sample
collected in the northern and upgradient portion of the Site. No other compounds were detected
in Site soil gas at concentrations above the DEQ DWM Vapor Intrusion SGSLs. To further
evaluate potential vapor intrusion risks for the proposed Site buildings, H&H utilized the DEQ
Risk Calculator (January 2021) using the highest compound concentrations detected in any soil
gas sample to simulate a hypothetical “worst-case” scenario under a residential use. The results
of the risk calculations did not indicate an exceedance of the DEQ and EPA acceptable risk levels.

Although assessment results do not indicate an unacceptable vapor intrusion risk at the Site, the
PD has elected to proactively install a passive vapor intrusion mitigation system in the proposed
residential apartment building during redevelopment activities as a precautionary measure.
Installation of the VIMS will satisfy the following Land Use Restriction (LUR) which is standard
language in the Brownfields Agreement:

No enclosed building may be constructed on the Brownfields Property and no existing
building, defined as those depicted on the plat component of the Notice of Brownfields
Property referenced in paragraph 18 below, may be occupied until DEQ determines in writing
that:
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i. the building is or would be protective of the building’s users and public health from the
risk of vapor intrusion based on site assessment data, or a site-specific risk assessment
approved in writing by DEQ; or
ii. a vapor intrusion mitigation system (VIMS) has been:
1. designed to mitigate vapors for subgrade building features in accordance with the most
recent and applicable DWM Vapor Intrusion Guidance, Interstate Technology &
Regulatory Council (ITRC) guidance, and American National Standards Institute
(ANSI)/American Association of Radon Scientists and Technologists (AARST)
standards, and that said design shall fully protect public health to the satisfaction of a
professional engineer licensed in North Carolina, as evidenced by said engineer’s
professional seal, and shall include a performance monitoring plan detailing
methodologies and schedule, both of which are subject to prior written DEQ approval;
and
2. installed and an installation report is submitted for written DEQ approval that includes
details on any deviations from the system design, as-built diagrams, photographs, and
a description of the installation with said engineer’s professional seal confirming that
the system was installed per the DEQ-approved design and will be protective of public
health.

According to the DWM Vapor Intrusion Guidance: “Risk-based screening is used to identify sites
or buildings likely to pose a health concern, to identify buildings that may warrant immediate
action, to help focus site-specific investigation activities or to provide support for building
mitigation and other risk management options including remediation.” In addition, this VIMP was
prepared to satisfy the vapor intrusion mitigation condition in the pending Brownfields Agreement.
Per the North Carolina Brownfields Property Reuse Act 130A-310.32, a prospective developer,
with the assistance of H&H for this project, is to provide NCDEQ with “information necessary to
demonstrate that ... as a result of the implementation of the brownfields agreement, the brownfields
property will be suitable for the uses specified in the agreement while fully protecting public health
and the environment instead of being remediated to unrestricted use standards.” It is in the context
of these risk-based concepts that H&H’s professional engineer makes the following statement.
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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 is fully protective of public health from known Brownfields Property
contaminants.
SEAL:

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2.0 Design Basis

The VIMP is included in Appendix C (Sheets VM-1, VM-2, VM-3, and VM-4) and will be used
to guide construction of the VIMS. The proposed Site redevelopment plan (Appendix A) includes
one residential apartment building which will be constructed with concrete slab-on-grade
foundations and structural footings in the residential units and column foundation in the resident
amenity areas and leasing office. The proposed building will wrap around a multi-story open-air
parking deck which will be constructed on the western portion of the Site. The first-floor footprint
for the building is approximately 72,463 square feet (sq ft). Please note, no residential units are
proposed on the basement level. However, due to the connection of the parking garage stairwell
and elevator to occupiable space, and the associated basement-level residential amenity areas (dog
spa, basement entry lobby, and trash room) located below residential units, these basement sections
have been included in the proposed VIMS design (see VM-3). For ease of reference, although
outside of the purview of this plan, it is our understanding that the parking garage is six levels and
mechanically vented to the atmosphere at the roofline. Based on the data provided to H&H at the
issuance of this plan, the electrical room proposed in the southwestern portion of the parking
garage will not be occupied and there are no plans to convert this room to occupiable space in the
future.

The VIMP includes installation of Vaporblock® Plus 20 (VBP20) vapor barrier manufactured by
Raven Industries (Raven) beneath the ground level concrete slab of each building. VBP20 is an
ASTM-certified 20-mil, multi-layer, chemically resistant vapor barrier, designed to prevent the
migration of VOCs. Technical specifications and installation instructions obtained from Raven
for the VBP20 vapor barrier are provided in Appendix D.

The VIMP specifies that the vapor barrier will be installed per manufacturer installation
instructions (Appendix D). Briefly, VBP20 will be installed by the construction contractor to
cover the ground surface below the entire area of the proposed ground floor slab and below the
basement-level portions of the building that are below the residential units or connect to the
residential portion of the building. The exterior edges of the VBP20 will be attached and sealed
to existing concrete utilizing VaporSeal™ tape or Butyl Seal 2-sided tape. Seams within the
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building footprint will have a minimum 12-inch overlap and will be sealed with VaporSeal™ tape
with the option of supplementing the seal with 2-sided Butyl Seal tape. Small puncture holes will
be sealed with VaporSeal™ tape or Pour-N-Seal™, and larger holes, tears, or damage will be
repaired using a patch that overlaps the damaged area and then will be taped along the seams. In
areas where utility penetrations (i.e., piping, ducts, etc.) are present and the use of taping is not
practical or deemed as “ineffective” by the design engineer, the Pour-N-Seal™ method will be
used to form an airtight seal around the penetrations. Locations where Pour-N-Seal™ is used will
be documented during the field inspections and noted on the as-built drawings.

Note that other vapor barrier bonding products (i.e., tapes, epoxies, etc.) that do not contain
compounds of concern for the Site and are approved by the engineer and by the vapor barrier
manufacturer may be used to seal the liner. Please also note that an equivalent vapor barrier
approved by the engineer which meets the criteria specified in Sheet VM-2 of the VIMP may also
be used by the installation contractor, such as Drago Wrap® manufactured by Stego Industries. If
Drago Wrap® is selected for use, DEQ will be notified in writing and specification and installation
instruction sheets will be provided. In the event that alternate equivalent vapor barrier bonding
products or vapor barrier liner (other than VBP20 or Drago Wrap®) are selected, DEQ approval
will be requested in writing prior to installation.

The VIMP also includes installation of an enhanced passive mitigation system beneath the building
slab to reduce the potential for vapor intrusion into the proposed building by vapor extraction.
Vapor extraction will be accomplished using syphon ventilators, vapor collection/conveyance
piping, and soil gas collector mat to collect vapor from beneath the slab of the building and
discharge the vapor through exhaust stacks installed above the building roofs. Product
specifications for the syphon ventilators and soil gas collector mat are included in Appendix D.

The VIMP includes Empire Model SV04SS (stainless steel) syphon ventilator fans (or a design
engineer approved alternate) installed on the discharge end of the exhaust stacks on the roof. The
exhaust discharge locations shall be a minimum of 10 feet from any operable opening or air intake
for the building and a minimum of 2 feet above the roofline. For system redundancy, the vent
systems below the slab-on-grade spaces are interconnected. The interconnected systems will allow
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for continued sub-slab depressurization below the building slabs in the event that active fans are
installed in the future or a syphon ventilator is damaged between yearly inspections completed by
building maintenance.

To enhance sub-slab vapor transmission and collection effectiveness, a uniform layer of high
permeability stone (clean #57 or similar stone) will be installed directly below the concrete slabs
to allow for air movement beneath the entirety of the slabs. Sub-slab vapor collection mat (1-inch
tall by 12” wide) will be installed within the high permeability stone layer. The thickness of the
high permeability stone around the piping will extend a minimum of 1-inch above the mat and a
minimum of 1-inch below the mat (for example, 3 inches of gravel around a 1-inch mat). In areas
without collection mat, a minimum thickness of 3 inches of clean stone is required. Alternate sub-
slab collection piping including threaded flush joint or glue joint 3” slotted PVC pipe, 3” perforated
PVC pipe, or similar with comparable characteristics to the soil gas collector mat may be approved
by the design engineer. DEQ will be notified in writing if an alternative piping is selected.

In the event the system needs to be activated with electric fans (see Section 4.0), the VIMP includes
vacuum measuring points (depicted in Sheets VM-3 and VM-4). The vacuum measuring points
will be used to measure the pressure differential between indoor air and the sub-slab, should
electric fans be needed. To prevent disrupting building operations in the future, the vacuum
measuring point access ports are located in areas that do not disturb building occupants such as
hallways and mechanical rooms (see Sheets VM-3 and VM-4 in Appendix C).

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3.0 Quality Assurance / Quality Control

For quality assurance and quality control purposes, inspections will be conducted for each section
of slab during the following phases of VIMS installation activities:

• after installation of horizontal collection system and gravel base placement;
• after vapor barrier installation and prior to pouring the concrete building slab and the
elevator pits; and
• after installation of vertical exhaust riser pipe and ventilator installations.

Please note that a fourth inspection will be conducted if the VIMS is activated to verify that the
electric fans are functioning properly. Each inspection will be performed by, or under direction
of, the design engineer certifying the VIMP. No component of the VIMS shall be covered until
an inspection is completed. The inspections will include field logs and photographs for each
section of slab. Locations where multiple penetrations are present and where Pour-N-Seal™ is
used will be photographed, noted on the field logs, and shown on the as-built drawings. The use
of hollow piping by contractors to support their utilities in preparation for concrete pours is not
permitted. Contractors will be instructed to remove any hollow piping observed during the field
inspections. If requested, the engineer certifying the report, or designee, will provide DEQ with
48 hours notice prior to conducting the inspections.

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4.0 Post-Construction System Effectiveness Testing

Influence Testing
Following installation of the horizontal extraction piping, vapor barrier, and concrete slab pours,
but prior to building occupancy, influence testing will be conducted on the VIMS vent piping
network to confirm that the VIMS will provide proper vacuum influence below the slab, if the
system is activated with electric fans in the future. For the influence test, variable speed vapor
extraction fans will be attached to the vertical risers and vacuum will be measured at the extraction
fan locations and at the permanent and temporary vacuum measuring points for the section of slab
being evaluated.

The results of the influence test will be submitted to DEQ with the construction completion report.
If modifications to the VIMS are required to achieve vacuum influence of 4 pascals (0.016-inches
water column), additional influence testing will be completed to evaluate the system modifications.
Following successful influence testing, the temporary vacuum measuring points will be
abandoned.

Sub-Slab Gas Sampling
Upon completion of successful influence testing and prior to occupancy of the Site building, sub-
slab soil gas samples will be collected from beneath the apartments and amenity areas to determine
if follow-up indoor air sampling is warranted. The sub-slab soil gas samples will be collected from
select permanent vacuum measuring points as shown on Sheet VM-3 and VM-4 in Appendix C.
Sub-slab soil gas sampling will be completed as outlined below:

Two sub-slab samples will be collected from the basement areas and nine sub-slab samples will
be collected from the first floor of the building footprint. The initial sub-slab soil gas sampling
event will be conducted after a minimum of two weeks following the installation of the syphon
ventilator fans.

During each sub-slab soil gas sampling event, one duplicate sub-slab soil gas sample will be
collected for quality assurance/quality control (QA/QC) purposes. The duplicate will be collected
from one of the measuring points using a stainless-steel sample “T” fitting which allows two vapor
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samples to be collected simultaneously from a single measuring point. The vacuum measuring
points will be sampled by securing an expandable cap with a sample port (i.e., an Ex-Cap) into the
vacuum measuring point to create an air-tight seal. The sub-slab vapor sample will then be
collected using the recommended procedures presented in the DWM VI Guidance.

Prior to sample collection, a leak test will be performed on each vacuum measuring point location
by placing a shroud around the sealed sampling point and sample train including the Summa
canister, flooding the air within the shroud with helium gas, then purging soil gas from the
sampling point with an electric air pump or syringe and collecting the purged vapor into a Tedlar®
bag. A helium gas detector will be used to measure helium concentrations within the shroud and
the Tedlar® bag sample. The leak test will be considered successful if the helium concentration
measured in the soil gas purged from the sampling point and collected into the Tedlar® bag is less
than 10% of the concentration measured within the shroud. H&H field personnel will record the
results of the helium leak test in field documentation. In total, a minimum of 3 volumes will be
purged from the sample train prior to and during the leak test.

The sub-slab soil gas samples will be collected in 1-liter Summa canisters at an approximate flow
rate of 100 mL/min. The vacuum of the Summa canisters will be measured at the start and end of
the sampling event and will be recorded on the chain-of-custody and within the field notes. The
vacuum in each canister at the conclusion of the sampling event must remain above 0 inches of
mercury (in Hg), and ideally around 5 in Hg, to allow for proper laboratory analysis of the sample.

Although the DWM VI Guidance recommends initial groundwater and soil gas assessment
activities be completed to reduce the analyte list for future vapor intrusion assessments and aid in
eliminating background sources, DEQ is requiring sub-slab samples be analyzed for the full list of
VOCs. As such, H&H will submit the sub-slab soil gas samples to a qualified laboratory under
standard chain of custody protocols for analysis of the full list of VOCs by EPA Method TO-15.
The laboratory will be instructed to report J-flag concentrations for each sample, to report received
canister vacuum, and to include naphthalene in the TO-15 analyte list. In addition, H&H will
request that the laboratory report compound concentrations to the lower of the laboratory method
detection limits or the DEQ DWM Residential Vapor Intrusion SGSLs.
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Upon receipt of the sub-slab soil gas sample analytical results, H&H will use the most current
version of the DEQ Risk Calculator to evaluate potential vapor intrusion risks for a residential use
scenario based on the proposed residential apartment development. In the case where calculated
cumulative risks are less than 1x10-4 for potential carcinogenic risks and below a hazard index of
1 for potential non-carcinogenic risks, the PD will request DEQ provide occupancy approval.

Post-occupancy sub-slab soil gas sampling will be completed approximately 6 months following
the pre-occupancy sampling event and then on a semi-annual basis for future events. The sub-slab
sampling events will be completed using the methods discussed above. If semi-annual sampling
results indicate consistent or decreasing concentrations within acceptable risk levels, a request to
modify or terminate sampling will be submitted for DEQ approval.

Note that the generic sub-slab soil gas to indoor air attenuation factor that is the basis for DEQ risk
calculations is very conservative and is intended to estimate a potential upper-bound indoor air
concentration accounting for temporal variability. DEQ DWM VI Guidance indicates that if soil
gas concentrations do not exceed acceptable risk levels, typically no further investigation is
necessary. However, DEQ has requested completion of an initial indoor air event concurrent with
the pre-occupancy sub-slab soil gas sampling event. DEQ has indicated that a request can be made
following the pre-occupancy indoor air sampling event to reduce or terminate future indoor air
sampling events based on the pre-occupancy influence testing, sub-slab soil gas, and indoor air
results. If indoor air sampling is required for post-occupancy events, it will be conducted semi-
annually in concurrence with the sub-slab soil gas sampling.

If indoor air sampling is terminated, but calculated cumulative risks for sub-slab samples collected
during future events are greater than 1x10-4 for potential carcinogenic risks and/or above a hazard
index of 1 for potential non-carcinogenic risks, additional indoor air sampling will be completed.
Please note that prior to proceeding with indoor air sampling the sub-slab soil gas data will be
reviewed to confirm that background sources (e.g., building materials) are not influencing
cumulative risks. If background sources are identified and confirmed, DEQ will be notified and
indoor air sampling will not be performed with written DEQ approval.
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The results of sub-slab vapor sampling completed at the Site will be reported to DEQ, as described
in Section 7.0. The building shall not be occupied until the results of the initial, pre-occupancy
sub-slab vapor sampling and indoor air sampling are submitted to DEQ and written approval for
occupancy is obtained from DEQ.

Indoor Air Sampling
The building is intended to be occupied shortly following completion and initialization of the
HVAC system. As discussed with DEQ, there is typically insufficient time before occupancy to
wait for the HVAC system to become operational prior to indoor air sampling. Therefore, the pre-
occupancy indoor air sampling event will be conducted following construction and completion of
the VIMS including a minimum of one week with operational syphon ventilators. Prior to indoor
air sampling, H&H will obtain DEQ approval to proceed with the sampling and provide a statement
confirming that the portion of the building being sampled is substantially complete (e.g., windows
and doors installed and sealed) with no openings to outdoor air which could potentially bias the
indoor air data in the area being sampled. Based on discussions with DEQ, two indoor air samples
will be collected from the basement level and five indoor air samples will be collected from the
first floor level at the approximate locations depicted on VM-3 and VM-4. The building shall not
be occupied until the indoor air results are provided to DEQ and written approval for occupancy
is obtained from DEQ.

Each indoor air sample will be collected in accordance with the DWM VI Guidance, using a 6-
liter individually-certified Summa canister over a 24-hour period and analyzed for select VOCs by
EPA Method TO-15. The VOCs for the select analyte list will be determined based on the
compounds detected within the sub-slab soil gas samples, and per discussion between H&H and
DEQ. The intake for each indoor air Summa canister will be placed at a height consistent with the
breathing zone.

Periodic checks will be conducted by H&H to monitor the pressure within the Summa canisters to
confirm adequate sample volume is collected. The vacuum of the Summa canisters will be
measured at the start and end of the sampling event and will be recorded on the chain-of-custody
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and field notes. The vacuum at the end of the sampling event should remain at or above
approximately -5 inches of mercury (in Hg), as measured with the field vacuum gauge. In no
instance shall the canister vacuum reach 0 in Hg.

Following sample collection, the samples will be shipped to the laboratory under standard chain
of custody protocol. The analytical laboratory will be instructed to report J-flag concentrations for
each sample. In addition, the laboratory will be requested to report results to reporting limits below
the DEQ Residential Vapor Intrusion Indoor Air Screening Levels (IASLs). Per standard
procedure, the laboratory will report the vacuum levels of the canisters upon receipt by the
laboratory. For QA/QC purposes, one duplicate sample and one background air sample will be
collected during each indoor air sampling event. In addition, an Indoor Air Building Survey form
(Appendix C of the DWM VI Guidance) will be completed for each sampling event.

Note, new construction materials, such as paint, carpet, etc., which could be sources of VOCs in
indoor air, may cause interference with Site-specific compounds during indoor air sampling.
Therefore, the construction contractor will be requested to provide safety data sheets (SDSs) for
materials used during construction and the SDSs will be submitted to DEQ.

Based upon the results of the indoor air sampling, H&H will make recommendations in general
accordance with the DWM VI Guidance. It is anticipated that the recommendations will consist
of one of the following:

• The VIMS is effective, and no further sampling of indoor air is warranted (per the DWM
VI Guidance, in the case where calculated cumulative risks are below 1x10-4 for potential
carcinogenic risks and below a hazard index of 1 for potential non-carcinogenic risks).

• Additional indoor air sampling is warranted to confirm that the VIMS is effective (per the
DWM VI Guidance, in the case where calculated cumulative risks are greater than 1x10-4
for potential carcinogenic risks or above a hazard index of 1 for potential non-carcinogenic
risks). Active fans will be installed as part of the VIMS and follow-up sampling will be
performed after installation of the fans should results of confirmation indoor air samples
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indicate that passive treatment is inadequate (in the case where calculated cumulative risks
continue to be greater than 1x10-4 for potential carcinogenic risks or above a hazard index
of 1 for potential non-carcinogenic risks).

Please note that DEQ may require additional indoor air sampling to confirm that the VIMS is
effective if results suggest a completed vapor intrusion pathway, even if cumulative risk is below
a LICR of 1x10-4 or HI of 1. Prior to completing additional indoor air sampling, an evaluation of
potential background sources will be completed and inspections will be performed to determine if
preferential vapor intrusion pathways may exist.

If additional indoor air sampling is required, modifications to the existing system will first be
evaluated to increase effectiveness (i.e. increasing the size of passive wind-driven turbine fans).
Should results of post-construction indoor air testing continue to indicate potential unacceptable
vapor intrusion risks to occupants of the building(s), active fans will be installed at the discharge
end of the riser duct piping (as needed) to convert the system from passive to active sub-slab
depressurization. DEQ will be notified of alterations to the system(s). If the system were
transitioned to an active system in the future, a work plan will be submitted to DEQ to document
a schedule for additional monitoring, such as annual vacuum measurements.

Sub-Slab Gas and Indoor Air Sampling Reporting
A report of the sub-slab gas sampling and indoor air sampling (if warranted) will be submitted to
DEQ with the construction completion report for each proposed building. If additional indoor air
sampling is required based upon the recommendations above, a report of the indoor air sampling
will be submitted to DEQ following completion of the sampling and receipt of the analytical data.

Following receipt of analytical results, the laboratory report will be reviewed and DEQ will be
notified in the event that TCE concentrations in indoor air (if warranted) or sub-slab indicate
potential vapor intrusion pathways may exist. In accordance with the DEQ DWM TCE Indoor Air
Inhalation Immediate Action Levels and Response guidance (dated July 2019), DEQ will be
notified within 24 hours (1 business day) of receipt of the laboratory data if TCE is detected at a
concentration exceeding 2.1 µg/m3 (if indoor air is collected). DEQ will also be notified prior to
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report submittal if sub-slab and indoor air samples indicate a completed pathway exists to discuss
whether additional sampling or other measures are warranted.

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5.0 Post-Occupancy Testing

The VIMS is proposed as a passive system which will utilize sub-slab vapor extraction through
vapor extraction piping and syphon ventilators on the roof. As such, post-occupancy differential
pressure testing is not anticipated. If the VIMS is converted to an active system based on results
of post-construction and pre-occupancy sub-slab gas and/or indoor air assessment results, vapor
mitigation system modifications and plans for additional indoor air sampling and long-term
differential pressure monitoring across the slab will be submitted to the DEQ Brownfields Program
for approval prior to implementation. Specifications for the potential fan to be used if conversion
to the active system is deemed necessary are included in Appendix D. However, a different fan
may be specified by the design engineer based on the influence testing results.

As discussed above, post-occupancy sub-slab soil gas sampling will be completed approximately
6 months following the pre-occupancy event and on a semi-annual basis for future events. The
sampling events will be completed using the methods discussed above. If semi-annual event
results indicate consistent or decreasing concentrations within acceptable risk levels, a request to
modify or terminate sampling will be submitted for DEQ approval.

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6.0 Future Tenants & Building Uses

The future use of the proposed Site buildings includes residential apartments. After occupancy of
the Site building, the building maintenance department will maintain the vapor mitigation piping
and ventilators. If vapor mitigation components are damaged or need to be altered for building
renovations, the building management will be instructed to contact the maintenance department.
The maintenance department shall contact a North Carolina licensed Professional Engineer to
oversee or inspect the activities, and a report shall be submitted to DEQ detailing the repairs or
alterations. To aid in identification of the vapor mitigation piping, the 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.

Future VIMS maintenance and upkeep will be the responsibility of the property management group
or building owner. As part of the annual Land Use Restriction Update submittal, H&H
recommends the building owner or management complete a visual inspection of the exposed
components of the system including, but not limited to, the vertical risers and ventilators on the
roof and the monitoring points. H&H recommends annual inspections be documented and kept
on record.

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7.0 Reporting

A construction completion report (sealed by a NC-licensed PE) that documents installation
activities associated with the VIMS will be submitted to DEQ following confirmation that the
mitigation system is installed, effective, operating properly, and protective of human health from
potential vapor intrusion of known Brownfields property contaminants. The report will include a
summary of VIMS installation activities, quality assurance and quality control measures, pre-
occupancy system effectiveness testing including sub-slab and indoor air assessment results (if
warranted), inspection photographs (including locations of penetration banks), SDSs, as-built
construction drawings, and an opinion as to whether the VIMS was installed in accordance with
the DEQ-approved VIMP. Multiple reports may be submitted depending on the construction
schedule of the building.

Prior to occupancy of the building, the results of the influence testing, sub-slab vapor sampling,
and indoor air sampling will be submitted to the Brownfields Program. The building shall not be
occupied until DEQ provides written approval.

After each additional post-construction sub-slab vapor sampling event (and indoor air sampling, if
completed), a brief report will be submitted to DEQ to document the sampling activities and
results.

Figures
USGS The National Map: National Boundaries Dataset, 3DEP Elevation
Program, Geographic Names Information System, National Hydrography
Dataset, National Land Cover Database, National Structures Dataset,
and National Transportation Dataset; USGS Global Ecosystems; U.S.
Census Bureau TIGER/Line data; USFS Road Data; Natural Earth Data;
U.S. Department of State Humanitarian Information Unit; and NOAA
National Centers for Environmental Information, U.S. Coastal Relief
Model. Data refreshed May, 2020.
SITE LOCATION MAP
BATTERY & IGNITION DISTRIBUTION TRYCLAN DRIVE AND ELLENWOOD PLACE
CHARLOTTE, NORTH CAROLINA
DATE: 2-23-21
JOB NO: PDP-001
REVISION NO: 0
FIGURE NO: 1
3921 Sunset Ridge Road, Ste. 301
Raleigh, North Carolina 27607
919-847-4241 (p) 919-847-4261 (f)
License # C-1269 / # C-245 Geology
TITLE
PROJECT
0 2,000 4,000
SCALE IN FEET
SITE
Path: \\HHFS01\Redirectedfolders\sperry\My Documents\ArcGIS\PROJECTS\PDP-001\PDP001.mxdN
U.S.G.S. QUADRANGLE MAP
CHARLOTTE EAST, NORTH CAROLINA 2013
CHARLOTTE WEST, NORTH CAROLINA 2013
QUADRANGLE
7.5 MINUTE SERIES (TOPOGRAPHIC)
REVISION NO. 0
JOB NO. PDP-001
DATE: 2-23-21
FIGURE NO. 2
BATTERY & IGNITION DISTRIBUTION
TRYCLAN DRIVE AND ELLENWOOD PLACE
CHARLOTTE, NORTH CAROLINA
SITE MAP
LEGEND
BROWNFIELDS PROPERTY BOUNDARY
PARCEL BOUNDARY
AIR COMPRESSOR
USED OIL AST
FLOOR DRAIN
ABOVE GROUND LIFT
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203704-586-0007(p) 704-586-0373(f)License # C-1269 / #C-245 Geology
STORAGE SPACE
(3700 ELLENWOOD PLACE)
DEUTSCHE PROCESS
(3642 & 3630 TRYCLAN DRIVE)
RESIDENCE
(3701 ELLENWOOD PLACE)
RESIDENCE
(3709 ELLENWOOD PLACE)
RESIDENCE
(3715 ELLENWOOD PLACE)
RESIDENCE
(3706 ELLENWOOD PLACE)
RESIDENCE
(3712 ELLENWOOD PLACE)ELLENWOOD PLACES. TRYON STREETTR
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DEWITT LANEVACANT COMMERCIAL
BUILDING
(3530 DEWITT LANE)
VACANT COMMERCIAL
BUILDING
(3539-3543 DEWITT LANE)
CATS LIGHT RAIL LOSO STATION
(UNDER CONSTRUCTION)
(4107-4115 CRAFT STREET)
RESIDENTIAL DEWITT LANEVACANT COMMERCIAL BUILDING
(3621 TRYCLAN DRIVE)
MULTI-TENANT BUILDING
(3601-3615 TRYCLAN DRIVE)
B & I AUTO MACHINE /
MOLINAS AUTO REPAIR
(3631 TRYCLAN DRIVE)
FORMER AMERICAN FENCE
(3605 S. TRYON STREET)
FORMER MIRACLE
CLEANERS / 2-SHAY
(3601 & 3603 S. TRYON
STREET)
YORKSHIRE DRIVE
BROWNFIELDS PROPERTY
(BPN 22033-18-60)
(UNDER CONSTRUCTION)GLEASON WAYYO
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NOTES:
1. AERIAL IMAGERY AND PARCEL DATA OBTAINED FROM
MECKLENBURG COUNTY GIS (2020).
2. AST = ABOVEGROUND STORAGE TANK
UST = UNDERGROUND STORAGE TANK
BPN = BROWNFIELDS PROJECT NUMBER
MAKE A MOVE / BEKINS
(3520 DEWITT LANE)
APPROXIMATE LOCATION
OF FORMER ON-SITE UST
B&I AUTO MACHINE
REPAIR SHOP
PAINT BOOTH
S:\AAA-Master Projects\Proffitt Dixon\PDP-001 - Tryclan Avenue\Figures\Site Map.dwg, FIG 2, 3/8/2021 12:47:19 PM, sperry

Appendix A LoSo Village Apartments Development Plan

VAN VAN
VAN726.0'
UP
UP
DN
DN
726.00 726.00
DN DN DN DN
DN726.00 725.00
725.40
725.10
726.00
726.00
725.00
DN
726.00
725.00
THE FRONT PORCH
726.00
727.00
726.00
DN
DN
726.00
732.39
LEASING OFFICE
AMENITY
SPRINKLER/
PUMP
ROOM BACKFLOW/PUMP RMPARKING DECK
POOL COURTYARD
10' x 10' SITE TRIANGLES
TRANSFORMERS
BASEMENT ENTRY
LOBBY BELOW
PET SPA
ENTRY
BELOW
SITE RETAINING WALL -
SEE CIVIL DWGS
SITE RETAINING WALL -
SEE CIVIIL DWGS
ROW
SETBACK
BUILD-TO
LINE
ROW & SETBACKBUI
LD-TO LI
NESITE TRIANGLE
T R Y C L A N D R I V E
D E W
I
T T

L A N EE L L E N W O O D L A N E
A
333 WEST TRADE STREET
R C H I T E C T U R E
SUITE 200CHARLOTTE, NC 28202
T 704.927.9900
w w w. a x i o m a r c h i t e c t u r e . c o m
REVISIONS
PROJECT A-2011
MARCH 5, 2021
A1.0
ARCHITECTURAL SITE
PLAN TRYCLAN DRIVE AND DeWITT LANECHARLOTTE, NORTH CAROLINALoSo VILLAGE APARTMENTSPROFFITT-DIXON PARTNERSNOT FOR CONSTRUCTION
1" = 20'-0"A1.0
1 ARCHITECTURAL SITE PLAN

Appendix B Summary Tables and Sample Location Map
Table 3 Summary of Groundwater Analytical DataBattery & Ignition DistributionCharlotte, North CarolinaaH&H Job No. PDP-001Evaluation AreaUpgradient Downgradient Upgradient Sample IDTMW-2 TMW-3 TMW-4Date2/11/2021 2/11/2021 2/11/2021UnitsVOCs (8260D)Acetone 31.4 33.2<6.2 <6.216.9 J6,000 4,500,00019,000,000cis-1,2-Dichloroethene<0.29 <0.29 <0.290.37 J<0.2970 NENEMethyl-tert-butyl ether 2.0 1.9<0.28 <0.28 <0.2820 45020,000Trichloroethene<0.22 <0.22 <0.2210.7<0.22314.4SVOCs (8270E)ALL BDL ALL BDL ALL BDL ALL BDL ALL BDL-- -- --Metals (6020B/7470A)Arsenic 0.786 J 0.453 J 0.895 J<0.1800.282 J 10 ----Barium 108 86.4 130 45.9 93.5 700 ----Cadmium<0.150 <0.150 <0.150 <0.150 <0.1502----Chromium (Total) 2.55 1.63 J 8.01 1.58 J 3.51 10 ----Lead 2.41<0.8494.50<0.849 <0.84915 ----Mercury<0.100 <0.100 <0.100 <0.100 <0.10010.180.75Selenium<0.300 <0.3000.365 J<0.3000.345 J 20 ----Silver<0.0700 <0.0700 <0.0700 <0.0700 <0.070020 ----Notes:1) North Carolina Department of Environmental Quality (DEQ) 15A NCAC 02L.0202 Groundwater Standards (2L Standards) dated April 20132) NC DEQ Division of Waste Management (DWM) Vapor Intrusion Groundwater Screening Levels (GWSLs) dated January 2021Concentrations are reported in micrograms per liter (µg/L).Compound concentrations are reported to the laboratory method detection limits.Laboratory analytical methods are shown in parentheses.With the exception of metals, only constituents detected in at least one sample are shown in the table above.Bold values exceed the 2L Standard.Underlined values exceed the DWMResidential and Non-Residential GWSLs. VOCs = volatile organic compounds; SVOCs = semi-volatile organic compundsNE = not established; -- = not applicable; BDL = below laboratory method detection limit J = Compound was detected above the laboratory method detection limit, but below the laboratory reporting limit resulting in a laboratory estimated concentration. µg/LDowngradient 2L Standards (1) Residential GWSLs (2)2/11/2021TMW-1 / GW-DUPScreening Criteria Non-Residential GWSLs (2)S:\AAA‐Master Projects\Proffitt Dixon\PDP‐001 ‐ Tryclan Avenue\Phase II ESA\Tables\Data Tables.xlsx3/12/2021Table 3 (Page 1 of 1) Hart & Hickman, PC
Table 4 Summary of Soil Gas Analytical DataBattery & Ignition DistributionCharlotte, North CarolinaH&H Job No. PDP-001Evaluation AreaSample IDSGP-2 SGP-3 SGP-4 SGP-5 SGP-6 SGP-7Sample DateSample Type UnitsVOCs (TO-15)Acetone<11150 53 18 J<1174 220 19 220,000 2,700,000Benzene20 196.3 1.117 18 20 2212 1602-Butanone (MEK) 11 J<2.06.5 J<2.04.8 J 4.1 J 30 3.2 J 35,000 440,000Carbon Tetrachloride<0.33 <0.331.0 J 0.73 J 1.3<0.33 <0.33 <0.3316 200Chloroform<0.24 <0.2411<0.24 <0.24 <0.24 <0.24 <0.244.1 53Cyclohexane 18<0.34 <0.34 <0.34 <0.3420<0.347.3 42,000 530,000cis-1,2-Dichloroethylene 5.9 5.7<0.27 <0.27 <0.27 <0.27 <0.27 <0.27NE NEEthanol 27 32 28 120 41 27 47 22 NE NEEthyl Acetate<4.3 <4.3 <4.3 <4.317<4.3 <4.3 <4.3490 6,100Ethylbenzene 12 12 3.1 0.9 22 24 15 29 37 4904-Ethyltoluene<0.30 <0.30 <0.30 <0.304.5<0.30 <0.305.3 NE NEHeptane 9.1 10 8.1 2.8 32 42 37 39 2,800 35,000Hexane 75 75 22 J 4.9 J 41 89 29 35 4,900 61,000Isopropanol<4.5 <4.55.8<4.57.3 J, L-03 8.3 J, L-03 22 L-03 5.8 J, L-03 1,400 18,000Methylene Chloride<1.6 <1.6 <1.61.8 J<1.6 <1.6 <1.6 <1.63,400 53,000Propene<1.2150<1.2 <1.2 <1.2140<1.2 <1.221,000 260,000Styrene<0.24 <0.240.46 J<0.24 <0.24 <0.24 <0.24 <0.247,000 88,000Tetrachloroethylene 1.3 J 1.4 8.2<0.441.9 2.9 85 2.0 280 3,500Toluene 170 170 37 3.5 130 140 110 170 35,000 440,000Trichloroethylene<0.40 <0.403.1<0.4017<0.40 <0.40 <0.4014 180Trichlorofluoromethane (Freon 11)<0.85 <0.851.5 J 1.4 J 1.4 J 1.6 J 0.99 J 1.3 J NE NE1,2,4-Trimethylbenzene<0.22 <0.22 <0.22 <0.2212 6.2 8.1 18 420 5,3001,3,5-Trimethylbenzene 0.83 J<0.26 <0.26 <0.263.3 2.5 2.7 5.4 420 5,300m&p-Xylene 44 47 11 3.7 66 82 43 94 700 8,800o-Xylene 11<0.233.7 1.2 25 27 15 33 700 8,800Notes:1) North Carolinia Department of Environmental Quality (DEQ) Division of Waste Management (DWM) Vapor Intrusion Soil Gas Screening Levels (SGSLs) dated January 2021Concentrations are reported in micrograms per cubic meter (µg/m3).Compound concentrations are reported to the laboratory method detection limits.Laboratory analytical method is shown in parentheses. Only compounds detected in at least one sample are shown in the above table.Bold values indicate an exceedance of DWM Residential SGSL. VOCs = volatile organic compounds; NE = not establishedJ = Compound was detected above the laboratory method detction limit, but below the laboratory reporting limit resulting in a laboratory estimated concentration.L-03 = Laboratory fortified blank/laboratory control sample recovery is outside of control limits resulting in a concentration that is likely biased on the low side for this compound.µg/m3Proposed Residential Building Screening CritriaSGP-1 / SG-DUPResidential SGSLs (1)Non-Residential SGSLs (1)2/10/2021Exterior Soil Gas S:\AAA‐Master Projects\Proffitt Dixon\PDP‐001 ‐ Tryclan Avenue\Phase II ESA\Tables\Data Tables.xlsx3/12/2021Table 4 (Page 1 of 1)Hart & Hickman, PC
TMW-3
SGP-6
TMW-4SGP-7
E
D
B
A
C
SGP-5
TMW-2
SGP-2
A
TMW-1
SGP-1
B
C
E
D
SGP-3
SGP-4
COMP-1
COMP-2
REVISION NO. 0
JOB NO. PDP-001
DATE: 2-23-21
FIGURE NO. 4
BATTERY & IGNITION DISTRIBUTION TRYCLAN DRIVE AND ELLENWOOD PLACE
CHARLOTTE, NORTH CAROLINA
SAMPLE LOCATION MAP
LEGEND
BROWNFIELDS PROPERTY BOUNDARY
PARCEL BOUNDARY
PROPOSED BUILDING FOOTPRINT
SOIL GAS SAMPLE LOCATION
COMPOSITE SAMPLE ALIQUOT SOIL BORING
LOCATION
TEMPORARY MONITORING WELL LOCATION
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203704-586-0007(p) 704-586-0373(f)License # C-1269 / #C-245 GeologyELLENWOOD PLACES. TRYON STREETTR
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DEWITT LANEDEWITT LANEDOGPARK
PARKING
DECK
COURTYARD/
POOLGLEASON WAYYO
R
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NOTES:
1.PRELIMINARY DEVELOPMENT PLAN PROVIDED BY AXIOM
ARCHITECTURE.
2.PARCEL DATA OBTAINED FROM MECKLENBURG COUNTY
GIS, 2020.
3. SOIL, GROUNDWATER, AND SOIL GAS SAMPLES COLLECTED BY H&H FROM 2/9/21 TO 2/11/21.
APPROXIMATE LOCATION
OF FORMER ON-SITE UST
S:\AAA-Master Projects\Proffitt Dixon\PDP-001 - Tryclan Avenue\Figures\Site Map.dwg, FIG 4, 3/5/2021 4:38:22 PM, sperry

Appendix C Vapor Intrusion Mitigation Plan – VM-1, VM-2, VM-3, and VM-4
w w w. a x i o m a r c h i t e c t u r e . c o m
REVISIONS
SEPTEMBER 3, 2021
VM-1TRYCLAN DRIVE AND DeWITT LANECHARLOTTE, NORTH CAROLINALoSo VILLAGE APARTMENTSPROFFITT-DIXON PARTNERSVAPOR INTRUSION MITIGATION SYSTEM (VIMS) SPECIFICATIONS
1.THIS VAPOR INTRUSION MITIGATION PLAN IS INTENDED TO BE USED FOR DIRECTION OF VIMS COMPONENT INSTALLATION ONLY AND IS NOT INTENDED TO GUIDE CONSTRUCTION OF STRUCTURAL COMPONENTS NOT
RELATED TO THE VIMS. CONSTRUCTION CONTRACTOR SHALL VERIFY CONSISTENCY OF VIMS DETAILS WITH APPLICABLE STRUCTURAL, ARCHITECTURAL, MECHANICAL, AND PLUMBING PLANS AND RESOLVE
INCONSISTENCIES WITH THE DESIGN ENGINEER PRIOR TO VIMS INSTALLATION. THE VIMS SHALL BE INSTALLED IN ACCORDANCE WITH APPLICABLE BUILDING CODES.
2.CONSTRUCTION CONTRACTORS AND SUB-CONTRACTORS SHALL USE "LOW OR NO VOC" PRODUCTS AND MATERIALS, WHEN POSSIBLE. NO PRODUCTS CONTAINING TETRACHLOROETHENE OR TRICHLOROETHENE
ARE PERMITTED.
3.VIMS VAPOR LINER SHALL BE VAPORBLOCK PLUS 20 VAPOR BARRIER MANUFACTURED BY RAVEN INDUSTRIES, INC (OR, EQUIVALENT ALTERNATIVE VAPOR LINER APPROVED BY THE ENGINEER AND NORTH
CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY (DEQ); I.E., DRAGO WRAP 20-MIL VAPOR INTRUSION BARRIER MANUFACTURED BY STEGO INDUSTRIES, LLC). ALTERNATIVE VAPOR LINER (IF USED) SHALL BE A
POLYOLEFIN FILM DESIGNED TO PREVENT VAPOR MIGRATION THROUGH CONCRETE SLABS-ON-GRADE.
THE VAPOR LINER SHALL BE INSTALLED AS SPECIFIED HEREIN AND PER MANUFACTURER INSTALLATION INSTRUCTIONS TO CREATE A CONTINUOUS LINER BELOW GROUND FLOOR SLABS. A BASE COURSE
CONSISTING OF CLEAN #57 (OR SIMILAR HIGH PERMEABILITY STONE APPROVED BY THE ENGINEER) SHALL BE INSTALLED BENEATH THE VIMS VAPOR LINER. IN AREAS AROUND THE SUB-SLAB PIPING AND SOIL GAS
COLLECTOR MAT, THE BASE COURSE LAYER MUST BE THICK ENOUGH TO COVER THE SUB-SLAB PIPING AND SOIL GAS COLLECTOR MAT WITH A MINIMUM 1-INCH LAYER ABOVE AND BELOW THE PIPING AND MAT. IN
AREAS WITHOUT PIPING OR SOIL GAS COLLECTOR MAT, THE BASE COURSE SHALL BE A MINIMUM OF 3-INCHES THICK.
4.ALL PENETRATIONS SHALL BE SEALED ACCORDING TO VAPOR LINER MANUFACTURER INSTALLATION INSTRUCTIONS AS FOUND IN THE MANUFACTURER INSTALLATION GUIDELINES. IF VAPORBLOCK PLUS 20 IS USED,
SMALL PUNCTURE HOLES SHALL BE SEALED WITH THE VAPORSEAL™TAPE, BUTYL SEAL DOUBLE SIDED TAPE, POUR-N-SEAL™AND LARGER HOLES, TEARS, OR DAMAGE SHALL BE REPAIRED USING A PATCH THAT
OVERLAPS THE DAMAGED AREA AND THEN SHALL BE TAPED ALONG THE SEAMS. IN AREAS WHERE UTILITY PENETRATIONS (I.E. PIPING, DUCTS, ETC) ARE PRESENT AND THE USE OF TAPING IS NOT PRACTICAL OR
DEEMED AS "INEFFECTIVE" BY THE DESIGN ENGINEER, POUR-N-SEAL SHALL BE POURED INTO FORM TO PATCH THE PENETRATION WITH AN AIRTIGHT SEAL. ANY LOCATIONS WHERE POUR-N-SEAL™ IS USED WILL BE
DOCUMENTED DURING INSPECTIONS.
5.CONSTRUCTION CONTRACTORS AND SUB-CONTRACTORS SHALL AVOID THE USE OF TEMPORARY FORM BOARDS THAT PENETRATE THE VAPOR LINER WHERE POSSIBLE. IF TEMPORARY FORM BOARDS ARE USED,
THE SIZE AND NUMBER OF PENETRATIONS THROUGH THE VAPOR LINER SHALL BE LIMITED AND SMALL DIAMETER STAKES (I.E. SOLID METAL STAKES) SHALL BE USED. IN ALL CASES, AS FORM BOARDS ARE
REMOVED, THE CONTRACTOR OR SUB-CONTRACTORS SHALL SEAL ALL PENETRATIONS IN ACCORDANCE WITH VAPOR LINER MANUFACTURER INSTALLATION INSTRUCTIONS. NO HOLLOW PIPING SHALL BE USED.
6.VIMS BELOW AND ABOVE GRADE PIPING SHALL NOT BE TRAPPED AND SHALL BE SLOPED A MINIMUM OF 18 UNIT VERTICAL IN 12 UNITS HORIZONTAL (1% SLOPE) TO GRAVITY DRAIN. SOLID SECTIONS OF HORIZONTAL
COLLECTION PIPE SHALL BE SUPPORTED TO PREVENT PIPE SAG OR LOW POINT AND MAINTAIN 1% SLOPE TOWARD SLOTTED SECTIONS TO DRAIN CONDENSATION. HORIZONTAL COLLECTION PIPE SHALL CONSIST
OF SOIL GAS COLLECTOR MAT (1" x 12") WITH 4" SCH 40 PVC AT SUB-GRADE FOUNDATION. ALTERNATE SUB-SLAB COLLECTION PIPING INCLUDING THREADED FLUSH JOINT OR GLUE JOINT 3" SCH 40 PVC PIPE WITH
0.020" TO 0.060" SLOT WIDTH AND 1
8" SLOT SPACING OR ALTERNATE SLOT PATTERN, OR SCH 40 PVC PERFORATED PIPE WITH 5
8" OR SMALLER DIAMETER PERFORATIONS SIMILAR AIR FLOW CHARACTERISTICS TO THE
SOIL GAS COLLECTOR MAT MAY BE USED WITH APPROVAL BY THE DESIGN ENGINEER. FOAM PIPE SLEEVES, OR SIMILAR, SHALL BE INSTALLED AROUND HORIZONTAL PORTIONS OF PIPES THAT PENETRATE
CONCRETE FOOTERS AND WALLS PER APPLICABLE STRUCTURAL PLANS AND BUILDING CODES, OR AS OTHERWISE DIRECTED BY THE APPLICABLE PLANS AND CONSTRUCTION ENGINEERS. PIPE SLEEVES SHALL BE
PROPERLY SEALED TO PREVENT A PREFERENTIAL AIR PATHWAY FROM BELOW THE SLAB INTO THE BUILDING. PLEASE REFER TO SHEET S3.03 IN THE STRUCTURAL DRAWINGS FOR FOOTING DETAILS ADDRESSING
VIMS PIPING.
7.3" SCH 40 PVC RISER DUCT PIPING SHALL BE INSTALLED TO CONNECT EACH SLAB PENETRATION LOCATION TO A ROOFTOP EXHAUST DISCHARGE POINT WITH A SYPHON VENTILATOR (SEE DETAIL #15). ABOVE-SLAB
RISER DUCT PIPE RUNS BETWEEN THE SLAB PENETRATION AND THE ROOFTOP EXHAUST DISCHARGE SHALL BE INSTALLED PER APPLICABLE NORTH CAROLINA PLUMBING AND BUILDING CODES AND AS SPECIFIED IN
THE CONSTRUCTION DOCUMENTS AND DRAWINGS.
8.RISER DUCT PIPING SHALL EXTEND IN A VERTICAL ORIENTATION THROUGH THE BUILDING ROOF AND TERMINATE A MINIMUM OF 2 FT ABOVE THE BUILDING ROOF LINE. AN EMPIRE MODEL STAINLESS STEEL SYPHON
VENTILATOR (OR APPROVED ALTERNATE) SHALL BE INSTALLED ON THE EXHAUST DISCHARGE END OF EACH RISER DUCT PIPE. AN ADAPTOR COUPLING SHALL BE INSTALLED AT THE DISCHARGE END OF THE 3"
RISER DUCT PIPE AND THE VENTILATOR SHALL BE SECURED TO THE PVC RISER IN A VERTICAL ORIENTATION. EXHAUST DISCHARGE LOCATIONS SHALL BE A MINIMUM OF 10 FT FROM ANY OPERABLE OPENING OR
AIR INTAKE INTO THE BUILDING. NOTE THAT DISCHARGE LOCATIONS ON THE ROOFTOP DEPICTED IN THE VAPOR INTRUSION MITIGATION PLAN MAY BE REPOSITIONED AS LONG AS THE NEW POSITION MEETS THE
REQUIREMENTS PRESENTED ABOVE. AN ELECTRICAL JUNCTION BOX (120V, 60Hz AC REQUIRED) SHALL BE INSTALLED NEAR THE FAN LOCATION ON THE ROOFTOP FOR CONVERSION TO ELECTRIC FANS, IF
REQUIRED. ALL WIRING AND ELECTRICAL TO BE INSTALLED PER APPLICABLE BUILDING AND ELECTRICAL CODES. PLEASE NOTE, THE SIZE AND APPEARANCE OF THE VIMS ROOF SYPHON VENTILATOR SHALL BE
APPROVED BY THE OWNER PRIOR TO PURCHASE AND INSTALLATION. FOLLOWING APPROVAL VIMS ROOF VENTILATORS SHALL BE INSTALLED AND PAINTED IN ACCORDANCE WITH THE MANUFACTURER'S WRITTEN
INSTRUCTIONS AND WITH A FINISH AND COLOR SELECTED BY THE ARCHITECT.
9.ABOVE-SLAB ACCESSIBLE RISER DUCT PIPING SHALL BE PERMANENTLY IDENTIFIED BY MEANS OF A TAG OR STENCIL AT A MINIMUM OF ONCE EVERY 10-LINEAR FT WITH "VAPOR MITIGATION - CONTACT
MAINTENANCE". THE SYPHON VENTILATOR SHALL BE LABELED WITH "VAPOR MITIGATION SYSTEM - CONTACT MAINTENANCE IF DAMAGED".
10.INSPECTIONS OF EACH COMPONENT OF THE VIMS SHALL BE CONDUCTED BY THE ENGINEER, OR ENGINEER'S DESIGNEE, TO CONFIRM VIMS COMPONENTS ARE INSTALLED PER THE APPROVED DESIGN. THE
REQUIRED INSPECTIONS INCLUDE: (1) INSPECTION OF SUB-SLAB PIPING LAYOUT AND GRAVEL PLACEMENT PRIOR TO INSTALLING VAPOR LINER; (2) INSPECTION OF VAPOR LINER PRIOR TO POURING CONCRETE; (3)
INSPECTION OF ABOVE-GRADE PIPING LAYOUT; AND (4) INSPECTION OF FAN AND VENT PIPE CONNECTIONS. THE CONSTRUCTION CONTRACTOR(S) SHALL COORDINATE WITH THE ENGINEER TO PERFORM THE
REQUIRED INSPECTIONS. NO VIMS COMPONENTS SHALL BE COVERED WITHOUT BEING INSPECTED.
PDP-001
VAPOR
MITIGATION PLAN
SPECIFICATIONS
ISSUED FOR CONSTRUCTION
VAPOR MITIGATION PLAN
PREPARED BY:
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
VIMS VAPOR LINER AND BASE COURSE (TYP)1
BASE COURSE - CLEAN #57 STONE
MIN 3" THICK BENEATH VIMS VAPOR LINER
VAPOR LINER (SEE SPECIFICATION #3)
CONCRETE FLOOR SLAB
NTSVM2
SUBBASE
VIMS SUB-SLAB VENT (TYP)2
SOIL GAS COLLECTOR MAT WITHIN
BASE COURSE - MIN 3" THICKNESS TO
COVER VENT WITH MIN 1-INCH ABOVE
AND BELOW
(SEE SPECIFICATIONS #3 AND #6)
VAPOR BARRIER (SEE SPECIFICATION #3)
SUBBASE
NTS
CONCRETE FLOOR SLAB
VM2
SECTION THROUGH EXTERIOR WALL
NTSVM2
BRICK OR BUILDING SIDING
EXTERNAL WALL (NOT
PRESENT AT ALL LOCATIONS)
STUD WALL
BASE COARSE
(SEE SPECIFICATION #3)
VAPOR LINER SEALED TO CONCRETE PER
MANUFACTURER INSTRUCTIONS.
SUBBASE
3
VAPOR LINER SHALL EXTEND ALONG
FOOTING EXTERIOR IF POSSIBLE AT
LOCATIONS WHERE EXTERIOR GRADE
IS HIGHER THAN INTERIOR GRADE
4A
NTSVM2
2" SCH 40 PVC 90 DEGREE ELBOW
VAPOR LINER PENETRATION SEALED TO
PIPE PER MANUFACTURER INSTRUCTIONS
2" VENT SCREEN AT
END OF PIPE
EXTERNAL/STUD WALL
(NOT PRESENT IN ALL
LOCATIONS)
2" SOLID SCH 40 PVC
VACUUM MEASURING POINT
POSITION VACUUM
MONITORING POINT SO VENT
SCREEN IS AT LEAST 5 FT FROM
AN EXTERNAL WALL
2' MIN
EXTERNAL/STUD WALL
(NOT PRESENT IN ALL
LOCATIONS)
FLOOR CLEANOUT, ADJUSTABLE,
4" DIA ZURN INDUSTRIES
MODEL #CO2450-PV4 (OR ENGINEER
APPROVED EQUIVALENT)FLUSH WITH
FINISHED FLOOR
4B
NTSVM2
2" SCH 40 PVC 90 DEGREE ELBOW
VAPOR LINER PENETRATION SEALED TO
PIPE PER MANUFACTURER INSTRUCTIONS
2" VENT SCREEN AT
END OF PIPE
STUD WALL
(NOT PRESENT IN ALL
LOCATIONS)
VACUUM MEASURING POINT THROUGH THICKENED SLAB
FLOOR CLEANOUT, ADJUSTABLE,
4" DIA ZURN INDUSTRIES
MODEL #CO2450-PV4 (OR ENGINEER
APPROVED EQUIVALENT)
FLUSH WITH
FINISHED FLOOR
2" SOLID SCH 40 PVC
- INCLUDE PIPE
SLEEVES WHEN
APPLICABLE; SEE
SPECIFICATION #6
VAPOR LINER PENETRATION SEALED
TO PIPE PER MANUFACTURER
INSTRUCTIONS
STUD WALL
(NOT PRESENT IN ALL LOCATIONS)
VAPOR LINER
BENEATH
THICKENED SLAB
HORIZONTAL PIPE THROUGH THICKENED SLAB
TOP OF THICKENED
SLAB TURNDOWN
FIRE WALL (NOT PRESENT
IN ALL LOCATIONS)
4" SOLID SCH 40 PVC -
INCLUDE PIPE SLEEVES
WHEN APPLICABLE; SEE
SPECIFICATION #6
6
VM2 NTS
SOIL GAS
COLLECTOR MAT
SOIL GAS
COLLECTOR
MAT TO SOLID
4" SCH 40 PVC
CONNECTION
VIMS VACUUM MEASURING POINT - DETAIL VIEW
NTSVM2
5
FINISHED FLOOR SLAB
2" SCH 40 PVC SET WITHIN GRAVEL LAYER
(SEE DETAILS 4A & 4B)
2" DRAIN EXPANSION TEST PLUG
BASE COURSE
(SEE SPECIFICATION #3)
FLOOR CLEANOUT, ADJUSTABLE, 4" DIA ZURN
INDUSTRIES MODEL #CO2450-PV4 (OR
ENGINEER APPROVED EQUIVALENT) FLUSH
WITH FINISHED FLOOR
4" x 2" FLUSH REDUCER
BUSHING
VAPOR BARRIER PENETRATION SEALED TO
PIPE PER MANUFACTURER INSTRUCTIONS
2" SCH 40 PVC 90 DEGREE STREET ELBOW
VERTICAL RISER AT SLAB PENETRATION WITH 90 DEGREE ELBOW
NTS
VAPOR LINER PENETRATION SEALED TO
PIPE PER MANUFACTURER INSTRUCTIONS
3" TO 4" SCH 40 PVC 90 DEGREE ELBOW
STUD WALL
3" SCH 40 PVC RISER DUCT PIPE
(SEE SPECIFICATION #8 & #9)
BASE COARSE
(SEE SPECIFICATION #3)
THICKENED SLAB MAY NOT BE PRESENT IN
ALL LOCATIONS
4" SOLID SCH 40 PVC
(SEE SPECIFICATION #7)
VM2
8
SOIL GAS COLLECTOR MAT
TO SOLID 4" SCH 40 PVC
CONNECTION
VERTICAL RISER AT SLAB PENETRATION WITH TEE
NTS
VAPOR LINER PENETRATION SEALED TO
PIPE PER MANUFACTURER INSTRUCTIONS
3" TO 4" SCH 40 PVC 90 DEGREE TEE
STUD WALL
3" SCH 40 PVC RISER DUCT PIPE
(SEE SPECIFICATION #8 & #9)
THICKENED SLAB MAY NOT BE PRESENT IN ALL
LOCATIONS
4" SOLID SCH 40 PVC
(SEE SPECIFICATION #6)
10
VM2
SOIL GAS COLLECTOR MAT TO SOLID 4" SCH
40 PVC PIPE TRANSITION (SLIP COUPLING
OR THREADED JOINT)
BASE COURSE
GEOVENT TO SOLID 4" SCH 40
PVC CONNECTION
BASE COURSE
(SEE SPECIFICATION #3)
VAPOR BARRIER SEALED TO CONCRETE
PER MANUFACTURER INSTRUCTIONS
VAPOR LINER SEALED TO COLUMN PER
MANUFACTURER INSTRUCTIONS
TYPICAL VIMS LINER ABOVE COLUMN FOOTING11
NTSVM2
TYPICAL VIMS LINER AT ELEVATOR PIT12
NTSVM2
WATERPROOFING
ELEVATOR SUMP
CONTINUOUS VAPOR LINER
SEALED PER MANUFACTURER
INSTRUCTIONS
VAPOR LINER SEALED TO
WATERPROOFING
WATERPROOFING - POST
APPLIED
VIMS SYPHON VENTILATOR & EXHAUST (TYP)15
VM2 NTS
ELECTRICAL JUNCTION BOX FOR POTENTIAL
FUTURE VACUUM FAN (REFER TO
SPECIFICATION #8)
RISER DUCT PIPE THROUGH ROOF
FLASHING
ROOFTOP
4" X3" HEAVY
DUTY NO HUB
COUPLING
4" SYPHON VENTILATOR (EMPIRE SYPHON
VENTILATOR OR ENGINEER APPROVED
EQUIVALENT)
GROUND FLOOR
INTERIOR SPACE
BASEMENT LEVEL
HALLWAY
SUB-BASE
CONCRETE
FLOOR SLAB
BASE COURSE
(SEE SPECIFICATION #3)
VAPOR LINER
(SEE SPECIFICATION #3)
VAPOR LINER SEALED TO OUTSIDE OF CONCRETE
AND WATERPROOFING/INSULATION (WHERE
PRESENT) PER MANUFACTURER INSTRUCTIONS
WATERPROOFING AND
RIGID INSULATION
DRAIN
STUD/SHEAR
WALL
VIMS AT RETAINING WALL13
NTSVM2
THICKENED SLAB TRANSITION7
NTSVM2
BASE COARSE
(SEE SPECIFICATION #3)
FIRE WALL PRESENT IN
SOME AREAS
STUD WALL
VAPOR LINER PENETRATION SEALED TO
PIPE PER MANUFACTURER INSTRUCTIONS
4" SCH 40 PVC 45 DEGREE ELBOW
SLAB STEP HEIGHT VARIES
4" SOLID SCH 40 PVC
(SEE SPECIFICATION #6)
SOIL GAS COLLECTOR MAT TO
SOLID 4" SCH 40 PVC PIPE
TRANSITION
SOIL GAS COLLECTOR MAT TO
SOLID 4" SCH 40 PVC PIPE
TRANSITION
VIMS PIPING THROUGH SLAB DROP WITH RISER DUCT PIPING (TYP)
NTS
9
VM2
SUB-BASE
VAPOR LINER
BASE COURSE
(SEE SPECIFICATION #3)
SOIL GAS COLLECTOR MAT TO
SOLID 4" SCH 40 PVC PIPE
TRANSITION
4" SCH 40 PVC
90-DEGREE ELBOW
VAPOR LINER SEALED TO PIPE
PER MANUFACTURER
INSTRUCTIONS
SOLID 3" SCH 40 PVC
(SEE SPECIFICATION #7)STUD WALLS
SOLID 3" SCH 40 PVC
RISER DUCT PIPE
(SEE SPECIFICATION #2)
3" TO 4" SCH 40 PVC
90-DEGREE TEE
SECTION THROUGH SLAB EDGE AT PARKING GARAGE
NTSVM2
STUD WALL BASE COARSE
(SEE SPECIFICATION #3)
VAPOR LINER SEALED TO CONCRETE PER
MANUFACTURER INSTRUCTIONS.
SUBBASE
14
VAPOR LINER SHALL EXTEND ALONG
FOOTING EXTERIOR TO SLAB GRADE
CONDITION VARIES
AT PARKING GARAGE
w w w. a x i o m a r c h i t e c t u r e . c o m
REVISIONS
PDP-001
SEPTEMBER 3, 2021
VM-2
VAPOR
MITIGATION PLAN
DETAILS TRYCLAN DRIVE AND DeWITT LANECHARLOTTE, NORTH CAROLINALoSo VILLAGE APARTMENTSPROFFITT-DIXON PARTNERSVAPOR MITIGATION PLAN
PREPARED BY:
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
ISSUED FOR CONSTRUCTION
C C
UP
10' X 25' LOADING SPACE
BUILDING ABOVE
BUILDING ABOVE
BUILDING ABOVE
GARAGE VENTILATION SHAFT
715.00
715.00
UP
POOL EQUIP.CHEM STORTRASH
ROOM
MAIN ELEC
ROOM
MAINTENANCE
OFFICE
TLT
BIKE
STORAGE
720.50
DOG SPA
BASEMENT
ENTRY
LOBBY
E-1
MP-1
E-2
MP-2
TMP-1
TMP-2
REVISIONS
VM-3TRYCLAN DRIVE AND DeWITT LANECHARLOTTE, NORTH CAROLINALoSo VILLAGE APARTMENTSPROFFITT-DIXON PARTNERS 1/16" = 1'-0"A2.1
1 BASEMENT FLOOR PLAN
N
LEGEND
EXTENT OF VAPOR LINER
SOIL GAS COLLECTION SYSTEM (SEE
SPECIFICATION #6 ON VM-1)
3" DIA SCH 40 SOLID PVC VERTICAL RISER
WITH FAN IDENTIFICATION NUMBER (REFER
TO DETAIL #15 ON VM-2)
2" DIA SOLID PVC PRESSURE MONITORING
POINT WITH FLUSH-MOUNTED COVER
2" DIA SOLID PVC PRESSURE MONITORING
POINT WITH FLUSH-MOUNTED COVER -
PROPOSED SUB-SLAB SOIL GAS SAMPLE
LOCATION
PROPOSED INDOOR AIR SAMPLE LOCATION
E-7
MP-4
MP-4
w w w. a x i o m a r c h i t e c t u r e . c o m
SEPTEMBER 3, 2021
PDP-001
VAPOR
MITIGATION PLAN
SUB-SLAB LAYOUT
- BASEMENT
VAPOR MITIGATION PLAN
PREPARED BY:
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
3
VM2
2
VM2
1
VM2
4A
VM2
12
VM2
13
VM2
8
VM2
10
VM2
14
VM2
ISSUED FOR CONSTRUCTION
UP
UP
UP
DN DN DN DN
BACKFLOW/SPRINKLERPUMP ROOMDN
DN
725.40
725.10
GARAGE VENTILATION SHAFT
ELECT/D
MECH
MECH
ELEC
TRASH
MECH T/D
725.92
725.00
DN
725.00
THE FRONT PORCH
727.00
ELEC.
MECH
TELE/DATA
DN
DN
GARAGE VENTILATION SHAFT
A3.2
158
A1.4
163
A1.4
161
C2.3-HC
159
A8
157
A3.5
129
B1
127
C2.2
125
A1.3
123 A7
121
A1.3
119
A6
117
A6
115 C2
113
B1
105
A3
111
A1
100
A2
102
A2.2
104
A2
106
C2
107
C6
108A6
110A6
112
A6.1
134
A1.1
150C5
149
A1.2
145
A1.2
144
A1.2
139
A6.2
135
C4
137
C4
136
A1.2
140
A3.1
141
A3.1
147
A3.1
142
A1.2
146
A1.2
143
A3.1
148
A3.6
118
C7
138
C2.3
126
A5
120
A3.6
116
C2
151
A3.6
114
A3.2
160
A3.2
162
A3.2
164
A3.4
101
A3.4
103
A3.5
128
A3.4-HC
124
A3.4
122
LEASING
141
LOUNGE
153
725.30
726.50
724.30
A3
130 MATCHLINEFMATCHLINEEMATCHLINEFMATCHLINEEMATCHLINE
FMATCHLINE
A
MATCHLINE
FMATCHLINE
A
MATCHLINE
DMATCHLINE
C
MATCHLINE
DMATCHLINE
C
MATCHLINECMATCHLINEBMATCHLINECMATCHLINEBMATCHLINEAMATCHLINEBMATCHLINEAMATCHLINEBMATCHLINEEMATCHLINEDMATCHLINEEMATCHLINEDDSDS
DS
DS
DS
DS
DS DS
DS DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS DS DS
DS DS DS
DS
DS
DS
DS
DS DS
DS
DS
DS
DS
DS
DS
A1.3
133
A1.3
132
A1.3
131
726.00
726.00
OVERSIZED
PACKAGE
MECH
PACKAGE
STAIR 5
MECH
ELEC.CORRIDORCORRIDOR
CORRIDOR CORRIDOR
STAIR 1
ELEV
LOBBY
STAIR 4
CORRIDOR
STAIR 3
STAIR 2
ELEV
LOBBY
A1.5
109
FITNESS
YOGA
RYTEK HIGH SPEED ROLL UP AUTOMOBILE GATES
POOL
COURTYARDDRYSPRINKLERROOM COWORKING
MECH
AWNING ABOVE
AWNING ABOVE
TEL /DATABUILDING PLAN NOTES1.2.3.4.ALL UNDESIGNATED DIMENSIONED INTERIOR WALLS TO BE 31/2" WOOD STUD.EXTERIOR WALLS & PLUMBING WALLS TO BE 5 1/2".ALL UNDIMENSIONED DOORS TO BE CENTERED OR TO BELOCATED 4 1/2" OFF SIDE WALL FRAMING TO FACE OF DOOR.SEE 1/4" UNIT PLANS FOR INTERIOR WALL LOCATIONS ANDADDITIONAL DETAILS.REFERENCE WALL TYPE SHEET (A7.0 - A7.15) FOR ALLINFORMATION ON CORRESPONDING WALL TAGS.11.REFER TO FINISH SCHEDULE FOR ALL INTERIOR WALL FINISHMATERIALS.12.SEE INTERIOR DESIGN DRAWINGS FOR ALL CEILING HEIGHTS,FINISHES, ETC. AT ALL AMENITY AREAS.13.PROVIDE TRANSITION STRIPS (SCHLUTER OR EQUAL) BETWEENDISSIMILAR FLOOR MATERIALS, ELEVATION CHANGE BETWEENTWO MATERIALS IS 1/2" MAX.14. SEE A12.2 FOR ALL TYPICAL ACCESSIBILITY DETAILS FOR ALLCOMMON AREAS.15.PROVIDE BLOCKING IN WALLS AS REQUIRED TO MEET ALLACCESSIBILITY REQUIREMENTS (SEE A12.0 - A12.2), AND ASNEEDED FOR SUPPORT OF CABINETS, SHELVES, HANDRAILS,ETC.5.ALL INTERIOR WOOD BEARING WALLS TO BE 1 HOUR FIRERATED (UL #305) - REFERENCE STRUCTURAL DRAWINGS FORALL LOCATIONS.6.ALL CORRIDOR TO UNIT WALLS TO BE 1 HOUR FIRE RATED -SEE WALL TYPE DESIGNATIONS AND SEE STRUCTURALDRAWINGS FOR SHEAR WALL LOCATIONS.7. ALL WOOD FRAME BALCONIES TO SLOPE 1/4" PER FOOT TOBALCONY EDGE SCUPPER OR DRAIN. ALL CONCRETEBALCONIES / TERRACES TO SLOPE 1/8" PER FOOT TOBALCONYEDGE, SCUPPER OR DRAIN.8.EXTERIOR FACE OF MASONRY VENEER SHALL BE 5 1/2” FROMEXTERIOR FACE OF FRAMING / CMU, UNLESS OTHERWISENOTED. MAINTAIN 1” MIN. AIRSPACE AT ALL MASONRYVENEER.9.SEE GRADING PLAN (CIVIL SHEETS) FOR BUILDING ENTRYELEVATION AND SITE WALL DIMENSIONS AND LOCATIONS.10.SEE ELECTRICAL PLANS FOR BUILDING ELECTRICAL LAYOUTS.
MP-7
E-11
E-10
E-22
E-8 E-9
E-19
E-16
E-13
E-14
E-15
E-17
E-18
E-3
E-4
E-5
E-6
E-7
E-12MP-5
MP-4
MP-3
TMP-5
MP-6
MP-8
MP-9
MP-10
MP-12
MP-13
MP-14
E-21
MP-11
VAN VAN
VANSPRINKLER/
PUMP ROOM
UP
UP
DN
GARAGE VENTILATION SHAFT
GARAGE VENTILATION SHAFT
732.39
E-20
TMP-4
TMP-3
w w w. a x i o m a r c h i t e c t u r e . c o m
REVISIONS
VM-4TRYCLAN DRIVE AND DeWITT LANECHARLOTTE, NORTH CAROLINALoSo VILLAGE APARTMENTSPROFFITT-DIXON PARTNERS 1/16" = 1'-0"A2.1
1 LEVEL 1 FLOOR PLAN
N
LEGEND
EXTENT OF VAPOR LINER
SOIL GAS COLLECTOR MAT (1" THICK AND 12"
WIDE)
3" DIA SCH 40 SOLID PVC VERTICAL RISER
WITH FAN IDENTIFICATION NUMBER (REFER
TO DETAIL #15 ON VM-2)
2" DIA SOLID PVC PRESSURE MONITORING
POINT WITH FLUSH-MOUNTED COVER
2" DIA SOLID PVC PRESSURE MONITORING
POINT WITH FLUSH-MOUNTED COVER -
PROPOSED SUB-SLAB SOIL GAS SAMPLE
LOCATION
PROPOSED INDOOR AIR SAMPLE LOCATION
BUILDING AREA MITIGATED ON THE
BASEMENT LEVEL
E-7
MP-4
MP-4
SEPTEMBER 3, 2021
PDP-001
VAPOR
MITIGATION PLAN
SUB-SLAB LAYOUT
- FIRST FLOOR
VAPOR MITIGATION PLAN
PREPARED BY:
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
1
VM2
1
VM2
2
VM2
2
VM2
3
VM2
3
VM2
4A
VM2
4A
VM2
4B
VM2
4B
VM2
6
VM2
6
VM2
10
VM2
10
VM2
8
VM2
8
VM2
11
VM2
13
VM2
9
VM2
7
VM2
14
VM2
ISSUED FOR CONSTRUCTION

Appendix D Vapor Intrusion Mitigation System 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.
SOIL GAS COLLECTOR MAT
Installation Guide
Radon Ready New Construction
Time-saving, low-cost solution
Easy Installation
Reduce Liability!
Used in all 50 states and
Internationally
Complian under multiple codes:
AARST-ANSI, ASTM,
IRC Appendix F,
EPA, HUD, and more!
Simple, modern solutions for soil
gases: radon, vapor, and VOCs
www.RadonMat.comPhotos, videos, & more @
MADE IN THE USA
SOIL GAS COLLECTOR MAT FOR RADON READY NEW CONSTRUCTION
According to the US EPA’s model stan-dards for radon control systesm in new building construction, a means for col-lecting soil gas should be installed be-neath the slab.
More and more mitigators and buildiers are using PDS’ soil gas collector mat because its installation does not entail any special coordination with plumb-ers or other site contractors. Low pro-file mat saves time as it removes the need for trenching. Just lay radon mat down around the inside perimeter of the foundation, secure it with spikes or landscaping staples, and pour the con-crete.
SGC mat is superior to other mat sys-tems because of its thickness and it has a geotextile fabric cloth surround-ing the entire mat material. This fea-ture eliminates the ened to lay a plas-tic barrier or sheet on top of the mat to protect the matrix. Using plastic sheeting can cause concrete cracking due to differential dewatering. The full fabric design greatly enhances both the installation as well as the quality of the concrete slab. When SGC mat is in-stalled below the slab, you’re providing an airspace that intercepts radon--and other soil gases and vapors--before it seeps into the building through the slab. SGC mat also works well as a soil gas collector beneath crawlspace bar-rier due to its low-profile.
WHY & HOW IT WORKS
The matting is a one inch high by twelve inch wide matrix enveloped in a geotextile filter fabric. 90% of the geomatrix is airspace, which means soil gas has room to move to the col-lection point. This creates incredible pressure field extension for post con-struction system activation. The mat can support concrete without com-pressing, yet is extremely lightweight and easy to handle.
This system allows for radon to flow through teh filter fabric and into the airspace. The airspace does not clog because the filter fabric retains teh underlying gravel and soil. The natural airflow through the mat then channels the radon to the T riser to pipe connec-tion. From there, hazardous gas can be vented safely through the roof of the building.
Another key element of a soil gas col-lection system is attaching the 4” riser to the mat, such that airflow is not restricted at this critical juncture. The soil gas T riser is unique as it has three ports, two redundant mat entries and one PVC connection to outside air. This unique fitting connects all three sides without special connections or fittings. common duct tape and caulk does the trick. 2
ADVANTAGES
NO TRENCHINGNO BACKFILLNO VAPOR BARRIER*

It’s called SOIL gas mat for a reason, Place directly on soil or substrate.
Low-profile (1” thick) gas mat does not require trenching.
SAFETY DATA & PRODUCT DATA SHEETS AVAILABLE @ www.RADONMAT.com 3
INSTALLATION INSTRUCTIONS
1. Begin work on the sub grade (soil or gravel) after the final preparation and
before the concrete is poured. Start with T-Riser(s) and work out to ensure
smooth mat placement. Position the T-Riser(s) in appropriate location(s) and
nail down with a 12” steel nail (T Nail) through precut center hole.
2. Slide mat into flat openings on either end of T-riser with a portion of the fab-
ric around the outside. Tape the fabric to the outside of the T-Riser with duct
tape and staple mat to the ground with landscape staples to ensure soil contact
remains during pour stage.
3. Mat is typically laid out in a rectangular loop in the largest area with branch-
es or legs into smaller areas (FREE plan design at www.radonmat.com). There
is no need to trench the mat. Roll out the SGC mat, smooth it onto the ground.
To avoid wrinkles and buckling, work away from the risers, stapling to the
ground as you go. The mat should be stapled every three to four feet, in addi-
ton to corners, tee junctions & ends.
5. Corners are constructed by peeling back the filter fabric, cutting two ends
of the matrix at 45 degree angles and butting (or overlapping: no more than
1/2”) the matrix together. Pull the filter fabric back and tape into place. Staple
across the joint of the matrix and each leg of the corner. Use a minimum of
four staples at each corner-- two across the joint and one on each leg.
6. The tees for branches and legs are constructed by slitting the fabric of the
main loop at the location desired. Cut the fabric of the branch at the edges and
expose two inces of the matrix. Cut off the exposed matrix and but the ma-
trix of the branch (or overlap 1/2”)to the matrix of hte main loop. Pull the flter
fabric of the branch back over the main loop and tape into place. Staple across
joint of the matrix with two staples and one each on the branch and main loop.
Use a minimum of four staples at each tee, two across the joint and one on
each loop and branch.
4
7. All openings in the fabric at joints, tee’s, and ends of branches should be
taped to keep out concrete.
8. Stub up a few feet of 4” schedule 40 PVC* from all T risers before pour (or
cover T riser with duct tape). Seal with polyurethene caulk and screws. This
ensures no concrete aggregate enters the riser during slab pour. Be sure to
label “CAUTION RADON REDUCTION SYSTEM” on all pipe. *(6” PVC may be
substituted--for large multifamily projects. Simply cut T riser 4” insert away to
reveal 6” insert).
9. When the building is ready for the vent pipe to be installed above the slab,
fit to pre-stubbed PVC with PVC straight connect. If PVC was not preset, cut
duct tape from riser and insert 4” PVC pipe now. Seal with polyurethene caulk
and secure with screws. Always label “CAUTION RADON REDUCTION SYSTEM”
to avoid confusion on site and for the building occupants.
note: The openings in the riser are laid out at 180 degrees to accomodate
straight runs of mat. However, if the riser is to be placed in a corner, which is
not uncommon, the front of the T can be cut and the SGC mat inserted into
the new opening. The side of the T that is unused should be sealed with tape.
This creates a 90 degree T which will allow corner placement for the riser. Mat
should always enter the T riser from at least two directions and exhaust to pipe
vertically.
SAFETY DATA & PRODUCT DATA SHEETS AVAILABLE @ www.RADONMAT.com 5
MAKING CORNERS AND SPLICES
The mat should be routed around the inside perimeter of the foundation. This
will require occasional corner junctions. Furthermore, splices will have to be
made to join two lengths of mat together. Corners and splices are very easy to
make, and do not require any special fittings. Cut back the filter fabric to reveal
the core material. In the case of a splice, merely overlap the core by at least
one corrugation, replace the cloth, and tape it. Use two landscape staples to
hold the splice in place. In the case of a corner, peel back geotextile fabric and
slice the core of the two adjoining legs at 45 degree angles which mirror each
other; overlap the edges by one corrugation; return grey geotextile fabric, tape
and staple the corner together.
6
CONNECTING THE MAT TO THE
T RISER
A convenient T-riser with dual entry al-
lows for either end of the loop of mat
to be secured to the riser. Slide the
mat into each end of the riser and tape
the edge to prevent wet concrete from
entering. Cap the riser to ensure no
concrete enters. T Riser caps can be
purchased in leui of duct tape. A pres-
tub of PVC pipe can also serve the same
purpose. See steps 8-9 of the previous
7
FLAT OUTLET
SGC to PVC transition
SIDE VIEW GOING THRU FOOTER/ INTERMEDIATE WALL
SOIL GAS MAT SOIL GAS MAT
PVC PIPE
FOOTER/INTERMEDIATE WALL/ TRENCH
Soil Gas Mat
TOP VIEW GOING OVER FOOTER/WALL/TRENCH
GRAVEL OR SOIL UNDER MAT
Soil Gas MatSoil Gas Mat 4” sch. 40 PVC PIPE
GRAVEL OR SOIL UNDER MAT
TRENCHTRENCHTRENCH & FOOTER CROSSINGS
IDEAL FOR LONG SPANS8
STEEL SLEEVE
24” (36”) x 1” x 12”
SIDE VIEW GOING THRU FOOTER/ INTERMEDIATE WALL
SOIL GAS MAT SOIL GAS MAT
PVC PIPE
FOOTER/INTERMEDIATE WALL/ TRENCH
Soil Gas Mat
TOP VIEW GOING OVER FOOTER/WALL/TRENCH
GRAVEL OR SOIL UNDER MAT
Soil Gas MatSoil Gas Mat
GRAVEL OR SOIL UNDER MAT
TRENCHTRENCHSTEEL SLEEVE
available in 24” or 36”
STEEL SLEEVE 1” thick
IDEAL SHORT TRENCHES 9
POURING CONCRETE
The filter fabric that comes sewn around the soil gas collector prevents the wet
concrete from entering the mat and reducing its air collection capacity. The
only precaution that needs to be taken is that the fabric is duct taped closed at
seams of splices and corner to sufficiently keep the uncured concrete from en-
tering.
The mat also needs to be secured to the soil with landscape staples to prevent
the concrete from lifting off the soil while it is being applied. Re-enforcing bars
and wire can be laid on top of the mat.
Note: the mat is strong enough (4,300 psf) to withstand concrete workers and
their wheel barrows.
10
radon risk
radon-induced lung cancer claims the lives of over 22,000 Americans each year
FACT: Radon is found in all 50 US states. The US EPA action level is 4.0 pci/L or higher
FACT: Homes without basements are still at risk
FACT: Radon is the leading cause of lung cancer among “never smokers”
FACT: Radon is a natural part of the Uranium 238 breakdown chain
FACT: Breathing 6.2 pci/L is the equivalent radiation dosage of a chest x-ray every other day for your lungs
FACT: Radon is colorless, odorless and invisible to the naked eye
FACT: Radon testing is cheap and you can do it yourself

get the facts @
www.RadonReality.com
Anything and everything radon, VISIT US @ www.radonPDS.com
about us
Professional Discount Supply | Radon
Family-owned and operated since 1996. Situated on Colorado’s front range, PDS focuses on generating radon awareness through one-on-one technical support and trouble-shooting.

We’re always just a phone call away.
719-444-0646
1902 Aerotech Drive, Ste 110
Colorado Springs, CO 80916
Distribution opportunities available,
Please call for availability in your market
RP Series
Radon Mitigation Fan
All RadonAway™ fans are specifically
designed for radon mitigation. RP Series
Fans provide superb performance, run
ultra-quiet and are attractive. They are ideal
for most sub-slab radon mitigation systems.
Features
• Energy efficient
• Ultra-quiet operation
• Meets all electrical code requirements
• Water-hardened motorized impeller
• Seams sealed to inhibit radon leakage
(RP140 & RP145 double snap sealed)
• RP140 and RP260 Energy Star® Rated
• ETL Listed - for indoor or outdoor use
• Thermally protected motor
• Rated for commercial and residential use
For Further Information Contact
Made in USA with US
and imported parts
All RadonAway inline radon fans are covered by our
5-year, hassle-free warranty
ETL Listed
9/12P/N 02008
MODEL P/N FAN DUCT
DIAMETER WATTS MAX.
PRESSURE“WC
TYPICAL CFM vs. STATIC PRESSURE WC
0”.5”1.0”1.5”2.0”
RP140*23029-1 4”15-21 0.8 135 70 ---
RP145 23030-1 4”41-72 2.1 166 126 82 41 3
RP260*23032-1 6”50-75 1.6 272 176 89 13 -
RP265 23033-1 6”91-129 2.3 334 247 176 116 52
RP380*28208 8”95-152 2.3 497 353 220 130 38
Model A B C
RP140 4.5”9.7”8.5”
RP145 4.5”9.7”8.5”
RP260 6”11.75”8.6”
RP265 6”11.75”8.6”
RP380 8”13.41”10.53”
*Energy Star® Rated
The World’s Leading
Radon Fan Manufaturer
RP Series
Installation Instructions
RadonAway
3 Saber Way Ward Hill, MA 01835
www.radonaway.com
3 Saber Way Ward Hill, MA 01835
P/N IN020-REV K 4/11
IN020 Rev K Page 2 of 8

RadonAway Ward Hill, MA.
Series Fan Installation Instructions
Please Read and Save These Instructions.

DO NOT CONNECT POWER SUPPLY UNTIL FAN IS COMPLETELY INSTALLED.
MAKE SURE ELECTRICAL SERVICE TO FAN IS LOCKED IN "OFF" POSITION.
DISCONNECT POWER BEFORE SERVICING FAN.

1. WARNING! Do not use fan in hazardous environments where fan electrical system could provide ignition to
combustible or flammable materials.
2. WARNING! Do not use fan to pump explosive or corrosive gases.
3. WARNING! Check voltage at the fan to insure it corresponds with nameplate.
4. WARNING! Normal operation of this device may affect the combustion airflow needed for safe operation of fuel
burning equipment. Check for possible backdraft conditions on all combustion devices after installation.
5. NOTICE! There are no user serviceable parts located inside the fan unit.
Do NOT attempt to open. Return unit to the factory for service.
6. All wiring must be performed in accordance with the National Fire Protection Association’s (NFPA)”National Electrical
Code, Standard #70”-current edition for all commercial and industrial work, and state and local building codes. All
wiring must be performed by a qualified and licensed electrician
7. WARNING! Do not leave fan unit installed on system piping without electrical power for more than 48 hours. Fan
failure could result from this non-operational storage.
8. WARNING! TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS, OBSERVE THE
FOLLOWING:

a) Use this unit only in the manner intended by the manufacturer. If you have questions, contact the manufacturer.

b) Before servicing or cleaning unit, switch power off at service panel and lock the service disconnecting means to
prevent power from being switched on accidentally. When the service disconnecting means cannot be locked, securely
fasten a prominent warning device, such as a tag, to the service panel.

IN020 Rev K Page 3 of 8

INSTALLATION INSTRUCTIONS IN020 Rev K
RP Series
RP140 p/n 23029-1
RP145 p/n 23030-1
RP260 p/n 23032-1
RP265 p/n 23033-1
RP380 p/n 28208 1.0 SYSTEM DESIGN CONSIDERATIONS 1.1 INTRODUCTION The RP Series Radon Fans are intended for use by trained, professional Radon mitigators. The purpose of this instruction is to provide additional guidance for the most effective use of an RP Series Fan. This instruction should be considered as a supplement to EPA standard practices, state and local building codes and state regulations. In the event of a conflict, those codes, practices and regulations take precedence over this instruction. 1.2 ENVIRONMENTALS The RP Series Fans are designed to perform year-round in all but the harshest climates without additional concern for temperature or weather. For installations in an area of severe cold weather, please contact RadonAway for assistance. When not in operation, the fan should be stored in an area where the temperature is never less than 32 degrees F. or more than 100 degrees F. 1.3 ACOUSTICS The RP Series Fan, when installed properly, operates with little or no noticeable noise to the building occupants. The velocity of the outgoing air should be considered in the overall system design. In some cases the "rushing" sound of the outlet air may be disturbing. In these instances, the use of a RadonAway Exhaust Muffler is recommended.
(To ensure quiet operation of ENERGY STAR qualified in-line and remote fans, each fan shall be installed using sound attenuation techniques appropriate for the
installation. For bathroom and general ventilation applications, at least 8 feet of insulated flexible duct shall be installed between the exhaust or supply grille(s) and the fan). 1.4 GROUND WATER In the event that a temporary high water table results in water at or above slab level, water may be drawn into the riser pipes thus blocking air flow to the RP Series Fan. The lack of cooling air may result in the fan cycling on and off as the internal temperature rises above the thermal cutoff and falls upon shutoff. Should this condition arise, it is recommended that the fan be turned off until the water recedes allowing for return to normal operation. 1.5 SLAB COVERAGE The RP Series Fan can provide coverage up to 2000+ sq. ft. per slab penetration. This will primarily depend on the sub-slab material in any particular installation. In general, the tighter the material, the smaller the area covered per penetration. Appropriate selection of the RP Series Fan best suited for the sub-slab material can improve the slab coverage. The RP140/145/155 are best suited for general purpose use. The RP260 can be used where additional airflow is required and the RP265/380 is best suited for large slab, high airflow applications. Additional suction points can be added as required. It is recommended that a small pit (5 to 10 gallons in size) be created below the slab at each suction hole.
IN020 Rev K Page 4 of 8

1.6 CONDENSATION & DRAINAGE Condensation is formed in the piping of a mitigation system when the air in the piping is chilled below its dew point. This can occur at points where the system piping goes through unheated space such as an attic, garage or outside. The system design must provide a means for water to drain back to a slab hole to remove the condensation. The RP Series Fan MUST be mounted vertically plumb and level, with the outlet pointing up for proper drainage through the fan. Avoid mounting the fan in any orientation that will allow water to accumulate inside the fan housing. The RP Series Fans are NOT suitable for underground burial. For RP Series Fan piping, the following table provides the minimum recommended pipe diameter and pitch under several system conditions.
Pipe
Dia. Minimum Rise per Ft of Run*
@25 CFM @50 CFM @100 CFM @200 CFM @300 CFM
6" - 3/16 1/4 3/8 3/4
4" 1/8 1/4 3/8 2 3/8 -
3" 1/4 3/8 1 1/2 - -
*Typical RP1xx/2xx Series Fan operational flow rate is 25 - 90 CFM 0n 3” and 4” pipe.
(For more precision, determine flow rate by measuring Static Pressure, in WC, and
correlate pressure to flow in the performance chart in the addendum.)
Under some circumstances in an outdoor installation a condensate bypass should be installed in the outlet ducting as shown. This may be particularly true in cold climate installations which require long lengths of outlet ducting or where the outlet ducting is likely to produce large amounts of condensation because of high soil moisture or outlet duct material. Schedule 20 piping and other thin-walled plastic ducting and Aluminum downspout will normally produce much more condensation than Schedule 40 piping. The bypass is constructed with a 45 degree Wye fitting at the bottom of the outlet stack. The bottom of the Wye is capped and fitted with a tube that connects to the inlet piping or other drain. The condensation produced in the outlet stack is collected in the Wye fitting and drained through the bypass tube. The bypass tubing may be insulated to prevent freezing. 1.7 "SYSTEM ON" INDICATOR A properly designed system should incorporate a "System On" Indicator for affirmation of system operation. A manometer, such as a U-Tube, or a vacuum alarm is recommended for this purpose.
RUN
RISE

IN020 Rev K Page 5 of 8
1.8 ELECTRICAL WIRING The RP Series Fans operate on standard 120V 60 Hz. AC. All wiring must be performed in accordance with the National Fire Protection Association’s (NFPA)”National Electrical Code, Standard #70”-current edition for all commercial and industrial work, and state and local building codes. All wiring must be performed by a qualified and licensed electrician. Outdoor installations require the use of a U.L. listed watertight conduit. Ensure that all exterior electrical boxes are outdoor rated and properly sealed to prevent water penetration into the box. A means, such as a weep hole, is recommended to drain the box. 1.9 SPEED CONTROLS The RP Series Fans are rated for use with electronic speed controls, however, they are generally not recommended. If used, the recommended speed control is Pass & Seymour Solid State Speed Control Cat. No. 94601-I. 2.0 INSTALLATION The RP Series Fan can be mounted indoors or outdoors. (It is suggested that EPA recommendations be followed in choosing the fan location.) The RP Series Fan may be mounted directly on the system piping or fastened to a supporting structure by means of optional mounting bracket.

IN020 Rev K Page 6 of 8
2.1 MOUNTING Mount the RP Series Fan vertically with outlet up. Insure the unit is plumb and level. When mounting directly on the system piping assure that the fan does not contact any building surface to avoid vibration noise. 2.2 MOUNTING BRACKET (optional) The RP Series Fan may be optionally secured with the RadonAway P/N 25007-2 (25033 for RP385) mounting bracket. Foam or rubber grommets may also be used between the bracket and mounting surface for vibration isolation. 2.3 SYSTEM PIPING Complete piping run, using flexible couplings as means of disconnect for servicing the unit and vibration isolation. 2.4 ELECTRICAL CONNECTION Connect wiring with wire nuts provided, observing proper connections (See Section 1.8):
Fan Wire Connection
Green Ground
Black AC Hot
White AC Common
2.5 VENT MUFFLER (optional) Install the muffler assembly in the selected location in the outlet ducting. Solvent weld all connections. The muffler is normally installed at the end of the vent pipe. 2.6 OPERATION CHECKS _____ Verify all connections are tight and leak-free. _____ Insure the RP Series Fan and all ducting is secure and vibration-free. _____ Verify system vacuum pressure with manometer. Insure vacuum pressure is less than maximum recommended operating pressure (Based on sea-level operation, at higher altitudes reduce by about 4% per 1000 Feet.) (Further reduce Maximum Operating Pressure by 10% for High Temperature environments)
See Product Specifications. If this is exceeded, increase the number of suction points. _____ Verify Radon levels by testing to EPA protocol.

Typical Indoor Installation
IN020 Rev K Page 7 of 8
RP SERIES PRODUCT SPECIFICATIONS The following chart shows fan performance for the RP Series Fan:
Typical CFM Vs Static Pressure "WC
0" .25" .5" .75" 1.0" 1.25" 1.5" 1.75" 2.0"
RP140 135 103 70 14 - - - - -
RP145 166 146 126 104 82 61 41 21 3
RP260 272 220 176 138 103 57 13 - -
RP265 334 291 247 210 176 142 116 87 52
RP380* 497 401 353 281 220 176 130 80 38
* Tested with 6” inlet and discharge pipe.
Power Consumption
120 VAC, 60Hz 1.5 Amp Maximum
Maximum Recommended
Operating Pressure* (Sea Level Operation)**
RP140 17 - 21 watts RP140 0.8" W.C.
RP145 41 - 72 watts RP145 1.7" W.C.
RP260 52 - 72 watts RP260 1.5" W.C.
RP265 91 - 129 watts RP265 2.2" W.C.
RP380 95 - 152 watts RP380 2.0" W.C.
*Reduce by 10% for High Temperature Operation
**Reduce by 4% per 1000 feet of altitude
Size Weight Inlet/Outlet
RP140 8.5H" x 9.7" Dia. 5.5 lbs. 4.5" OD (4.0" PVC Sched 40 size compatible)
RP145 8.5H" x 9.7" Dia. 5.5 lbs. 4.5" OD (4.0" PVC Sched 40 size compatible)
RP260 8.6H" x 11.75" Dia. 5.5 lbs. 6.0” OD
RP265 8.6H" x 11.75" Dia. 6.5 lbs. 6.0” OD
RP380 10.53H" x 13.41" Dia. 11.5 lbs. 8.0” OD

Recommended ducting: 3" or 4" RP1xx/2xx, 6” RP380, Schedule 20/40 PVC Pipe
Mounting: Mount on the duct pipe or with optional mounting bracket.
Storage temperature range: 32 - 100 degrees F.
Normal operating temperature range: -20 - 120 degrees F.
Maximum inlet air temperature: 80 degrees F.
Continuous Duty
Class B Insulation
Thermally Protected
3000 RPM
Rated for Indoor or Outdoor Use

RP140 and RP260
Only.

IN020 Rev K Page 8 of 8
IMPORTANT INSTRUCTIONS TO INSTALLER

Inspect the GP/XP/XR/RP Series Fan for shipping damage within 15 days of receipt. Notify
RadonAway of any damages immediately. Radonaway is not responsible for damages incurred
during shipping. However, for your benefit, Radonaway does insure shipments.

There are no user serviceable parts inside the fan. Do not attempt to open. Return unit to factory
for service.

Install the GP/XP/XR/RP Series Fan in accordance with all EPA standard practices, and state and local building codes and state regulations.
WARRANTY
Subject to any applicable consumer protection legislation, RadonAway warrants that the GPX01/XP/XR/RP Series Fan (the “Fan”) will be free from
defects in materials and workmanship for a period of 90 days from the date of purchase (the “Warranty Term”).
RadonAway will replace any Fan which fails due to defects in materials or workmanship. The Fan must be returned (at Owner’s cost) to the
RadonAway factory. Any Fan returned to the factory will be discarded unless the Owner provides specific instructions along with the Fan when it is
returned regardless of whether or not the Fan is actually replaced under this warranty. Proof of purchase must be supplied upon request for
service under this Warranty.
This Warranty is contingent on installation of the Fan in accordance with the instructions provided. This Warranty does not apply where any
repairs or alterations have been made or attempted by others, or if the unit has been abused or misused. Warranty does not cover damage in
shipment unless the damage is due to the negligence of RadonAway.
5 YEAR EXTENDED WARRANTY WITH PROFESSIONAL INSTALLATION.
RadonAway will extend the Warranty Term of the fan to 5 years from date of manufacture if the Fan is installed in a professionally designed and
professionally installed radon system or installed as a replacement fan in a professionally designed and professionally installed radon system.
Proof of purchase and/or proof of professional installation may be required for service under this warranty. Outside the Continental United States
and Canada the extended Warranty Term is limited to one (1) year from the date of manufacture.
RadonAway is not responsible for installation, removal or delivery costs associated with this Warranty.
EXCEPT AS STATED ABOVE, THE GPx01/XP/XR/RP SERIES FANS ARE PROVIDED WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION,IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL RADONAWAY BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES ARISING OUT OF, OR RELATING TO, THE FAN OR THEPERFORMANCE THEREOF. RADONAWAY’S AGGREGATE LIABILITY HEREUNDER SHALL NOT IN
ANY EVENT EXCEED THE AMOUNT OF THE PURCHASE PRICE OF SAID PRODUCT. THE SOLE AND
EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE THE REPAIR OR REPLACEMENT OF THE
PRODUCT, TO THE EXTENT THE SAME DOES NOT MEET WITH RADONAWAY’S WARRANTY AS
PROVIDED ABOVE.
For service under this Warranty, contact RadonAway for a Return Material Authorization (RMA) number and shipping
information.  No returns can be accepted without an RMA.  If factory return is required, the customer assumes all shipping
cost to and from factory.
RadonAway
3 Saber Way
Ward Hill, MA 01835
TEL. [phone]
FAX [phone]
Record the following information for your records:
Serial No.
Purchase Date