19054 HD Supply VIMS Apts Plan and Approval 20190606

June 6, 2019 Sent Via E-mail [e-mail]
Trinh C. DeSa, PE Hart & Hickman
2923 south Tryon Street, Suite 100 Charlotte, North Carolina 28203

Subject: Vapor Mitigation Design Compliance Review Railyard Apartments Revision 1
HD Supply Brownfields Property
Charlotte, Mecklenburg County Brownfields Project No. 19054-15-060

Dear Mr. DeSa:
The North Carolina Department of Environmental Quality Brownfields Program (DEQ Brownfields) received and reviewed the Vapor Intrusion Mitigation Plan Railyard Apartments Revision 1 (VIMP)dated May 30, 2019. DEQ Brownfields has found this VIMP to be in compliance with Land Use Restriction 8 of
the Notice of Brownfields Property. Consistent with the brownfields agreement for this project, an essential component of public health
protection for this design is the professional engineer’s seal of these documents that the proposed design will be effective at mitigating the potential for vapor intrusion at the property and protecting public health.
Furthermore, any final occupancy approval from DEQ Brownfields will ultimately be based on analytical
results of indoor samples collected as outlined in Section 4.0 of the VMP. In addition, DEQ Brownfields’ reserves the authority to require confirmation of efficacy in the future.

Please be advised that this design compliance review from DEQ Brownfields does not waive any applicable requirement to obtain any necessary permits, licenses or certifications which may be required from other
state or local entities. If you have any questions, please feel free to contact me at 704-661-0330 or Joselyn
Harriger at 704-235-2195 [e-mail].
Sincerely, Carolyn Minnich
Carolyn Minnich
Brownfields Project Manager Division of Waste Management

ec: Nathan O'Leary [e-mail] Matt Lucarelli [e-mail]
Harriger, Joselyn <[e-mail]>
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Vapor Intrusion Mitigation Plan - Revision 1
HD Supply – Railyard Apartments
1425 Winnifred Street
Charlotte, North Carolina
Brownfields Project No. 19054-15-060
H&H Job No. CCW-002

Table of Contents

Section Page No.
1.0 Introduction and Background .................................................................................. 1 
2.0 Design Basis ................................................................................................................ 3 
3.0 Quality Assurance / Quality Control ........................................................................ 5 
4.0 Pre-Occupancy System Influence Testing ............................................................... 6 
5.0 Post-Occupancy Testing ............................................................................................ 9 
6.0 Future Tenants & Building Uses ............................................................................ 10 
7.0 Reporting .................................................................................................................. 11 

Figures

Figure 1 Site Location Map
Figure 2 Site Map

Attachments

Attachment 1 Vapor Mitigation System Plan Drawing – VM-1 – Revision 1 (04/04/19)
Attachment 2 Drago® Wrap Vapor Barrier Specification Sheet and Installation Instructions
Attachment 3 VIMS Components Product Specification Sheets
Attachment 4 Select Indoor Air Sampling VOC Constituent List

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Vapor Intrusion Mitigation Plan - Revision 1
HD Supply – Railyard Apartments
1425 Winnifred Street
Charlotte, North Carolina
Brownfields Project No. 19054-15-060
H&H Job No. CCW-002
1.0 Introduction and Background
Hart & Hickman, PC (H&H) has prepared this Vapor Intrusion Mitigation Plan (VIMP) for
installation of a vapor mitigation system at the proposed Railyard Apartments development at the
HD Supply Brownfields Site located at 1425 Winnifred Street in Charlotte, North Carolina (Site
or subject Site). A Site location map is provided as Figure 1. The western portion of the HD
Supply Site is being redeveloped with multi-family residential apartment units. The apartment
building will include three wings along the north, west, and south sides of an open-air parking
deck located in the central portion of the Site. The eastern portion of the Site is being developed
with two retail and commercial use tower buildings known as The Railyard at Southend. The
towers at the Site are currently under construction and a VIMP was previously approved by the
North Carolina Department of Environmental Quality (DEQ) Brownfields Program for the
southern tower.
Results of previous soil, groundwater, and soil gas sampling indicate vapor mitigation is
warranted for the southern wing of the apartment building located on the southwestern portion of
the Site. A layout of the proposed residential buildings and proposed location for the VIMP is
included on the Vapor Intrusion Mitigation System Plan and Design (Sheet VM-1 – Revision 1)
included in Attachment 1.
The VIMP is described in the following sections and was designed in accordance with the DEQ
Division of Waste Management (DWM) Vapor Intrusion Guidance (VI Guidance) and the DEQ
Brownfields Program Preliminary Vapor Intrusion Mitigation System Design Submittal New
Construction Minimum Requirements Checklist. Note, in an email dated April 4, 2019,
DEQ provided preliminary approval of Sheet VM-1 with a slight modification to include two
additional pressure monitoring points (see Section 2.0) so construction of the building could
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begin. Subsequently, construction of the sub-surface components of the vapor intrusion
mitigation system (VIMS) commenced on April 10, 2019 and the sub-surface VIMS
components were inspected by H&H as specified in this Plan.
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2.0 Design Basis

The proposed residential apartment building includes a slab-on-grade foundation with
commercial and amenity spaces on the ground-level and residential and amenity spaces on the
upper floors. The VIMP includes installation of Drago® Wrap vapor barrier liner manufactured
by Stego Industries LLC (Stego) below the slab of the southern wing of the apartment building.
Drago® Wrap is an ASTM-certified 20-mil, multi-layer, chemically resistant vapor barrier,
designed to prevent the migration of volatile organic compounds (VOCs). Technical
specifications and installation instructions obtained from Stego Industries for the Drago® Wrap
vapor barrier are provided in Attachment 2. In general, Drago® Wrap will be installed to
completely cover the area below the ground floor slab in the southern portion of the Railyard
Apartment building and sealed per the manufacturer instructions provided in Attachment 2. The
ground floor of the apartment building will include a flat concrete foundation slab with columns
and footings for support of upper floors.

An equivalent vapor barrier liner approved by the engineer which meets the criteria specified in
Sheet VM-1 may also be used by the installation contractor. If an alternate equivalent vapor
barrier is selected, DEQ will be notified of the alternate liner for their review and approval prior
to installation.

In addition to the Drago® Wrap, the VIMP includes passive sub-slab vapor extraction below the
vapor barrier and building slab to reduce the potential for vapor intrusion in the lower level of
the southern wing of the apartment building. The sub-slab vapor extraction system will be
comprised of 3-inch horizontal slotted poly-vinyl chloride (PVC) pipe installed below the
Drago® Wrap. To enhance sub-slab vapor transmission and collection effectiveness, the
horizontal sub-slab piping will be installed in approximately 5-inches of high permeability stone
(clean No. 57 stone, or similar).

The horizontal PVC pipe will be connected to 3-inch or 4-inch PVC riser pipe which will extend
through the building’s roof. Stainless-steel Empire turbine ventilator fans (rated for 126 cubic
feet per minute exhaust flow in a four mile per hour wind) will be installed on the discharge end
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of the riser pipes. Please note that an equivalent turbine ventilator fan approved by the engineer
may also be used by the installation contractor. Product specification sheets for the slotted
piping, turbine ventilator fans, and other VIMS components are included as Attachment 3.

The VIMP will also include pressure measuring points at the approximate locations depicted on
Sheet VM-1 – Revision 1 in Attachment 1. Note, based on preliminary comments received from
DEQ on April 4, 2019, additional monitoring points were added to Stair #2 and near Commercial
12, as depicted on Sheet VM-1 – Revision 1. The monitoring points will be used to measure the
pressure differential between indoor air and the sub-slab during system influence testing and
during operation should the VIMS be converted to an active system in the future (based upon the
results of follow-up indoor air sampling discussed below). Note, several of the vacuum
measuring points are considered to be temporary, and may be abandoned following the pre-
occupancy system influence testing detailed below, with permission from DEQ.

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3.0 Quality Assurance / Quality Control

For quality assurance and quality control (QA/QC) purposes, inspections will be conducted
during each phase of VIMS installation including:
 upon installation of the horizontal piping collection system and gravel base placement;
 installation of the vapor barrier and prior to pouring the concrete slab; and
 installation of the vertical exhaust riser pipe and connection to the wind driven turbine
ventilator fans.

Each inspection will be performed by, or under direction of the VIMS design engineer certifying
the VIMP. The VIMS inspections will be documented with field logs/notes and photographs.
H&H will attempt to provide DEQ with a minimum of 48-business hours of advanced notice
prior to inspections.

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4.0 Pre-Occupancy System Influence Testing

Upon installation of the VIMS and at a time when the concrete slab has sufficiently cured,
influence testing will be conducted prior to the building being occupied in accordance with DEQ
guidance. The purpose of the influence testing is to evaluate whether the VIMS horizontal pipe
network is capable of maintaining a minimum vacuum influence of 4 Pascals (Pa) below the
slab. It should be noted that an influence of 4 Pa is required in the event that the VIMS is
converted to an active system (installation of radon fans). The VIMS will initially be installed as
a passive system and will not be required to maintain an influence of 4 Pa.

During the influence test, one or more variable speed vapor extraction fans will be connected to
select vertical exhaust risers in each section of the concrete slab. Vacuum and air flow
measurements will be collected at varying speeds at each fan location, and vacuum
measurements will be recorded at each vacuum measuring point. The results of the influence
tests will be submitted to DEQ for review upon completion of the testing and internal evaluation
of the collected data.

Pre-Occupancy Indoor Air Sampling
Based on the proposed construction schedule, the ground floor concrete slab will be completed
prior to occupancy of upper floors. Therefore, after installation of the VIMS (sub-slab vapor
extraction system and 20-mil vapor barrier liner) and upon completion of the concrete slab on the
ground floor, two indoor air samples will be collected from representative locations on the
ground floor. If possible, the indoor air samples will be collected when the building HVAC
systems are operating.

The indoor air samples will be collected using 6-liter Summa canisters. The Summa canisters
will be equipped with air flow regulators to slowly collect the air samples over an 8-hour period,
since the ground floor of the building contains only commercial and amenity spaces.
Additionally, 3 ft to 4 ft sampling canes will be affixed to the top of the Summa canisters to
collect the air samples from the typical breathing zone height. To evaluate the reproducibility of
the analytical results, one duplicate indoor air sample will be collected using a laboratory
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supplied T-sampler. The collected air samples will be submitted to an analytical laboratory for
analysis of select VOCs by EPA Method TO-15. The select VOC list will include each
compound that was detected above laboratory reporting limits during previous soil gas sampling
activities completed at the Site. The select list of VOCs is provided in Attachment 4. The
laboratory will be requested to report concentrations to the laboratory method detection limits.
Concentrations reported between the laboratory reporting limit and the laboratory method
detection limit will be estimated values and reported with a J Flag in the laboratory analytical
report.

Following receipt and validation of the analytical data from the laboratory, H&H will evaluate
the cumulative risks associated with the compounds and the concentrations at which they are
detected in the collected indoor air samples. H&H will then prepare a brief letter report detailing
the sampling methodology, tabulated analytical results in comparison to DEQ Residential and
Non-Residential Vapor Intrusion Screening Levels, and results of the cumulative risk
calculations using DEQ’s Risk Calculator.

If the evaluation indicates acceptable risk levels, H&H will request concurrence from DEQ that
the building can be occupied. If the evaluation indicates a potentially unacceptable risk to
occupants (calculated cumulative carcinogenic risk greater than 1x10-4 and/or a non-carcinogenic
hazard index of 1 or greater), H&H will recommend a second round of air sampling from
representative locations of the ground floor. In this scenario, H&H will coordinate with DEQ to
select the appropriate sampling locations. The additional indoor air samples will be collected in
a similar manner to the procedures described above.

In the unlikely event that the analytical results of indoor air samples collected during the first and
second sampling events indicate a potentially unacceptable risk to occupants, then H&H will
evaluate options to remove or mitigate compounds of concern in indoor air. Options may
include increasing the volume of exterior air (makeup air) introduced during HVAC system
cycles or replacing the wind-driven fans on the vertical riser pipes with electric fans to actively
mitigate sub-slab vapors. If warranted, these options will be discussed with DEQ for approval
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prior to implementation. Post-mitigation indoor air sampling will then be performed and
reported to DEQ in accordance with the procedures detailed above.

It should be noted that because building construction materials may be sources of VOCs in
indoor air, H&H will request that the construction contractor provide Safety Data Sheets (SDSs)
for materials used during construction. If elevated concentrations of VOCs are detected in
indoor air samples, H&H will review the SDSs to evaluate the source of the detections. During
the indoor sampling event(s), an exterior background air sample will be collected at the time of
indoor air sampling. Soil gas samples may also be collected at the time of or after completion of
the various indoor air sampling events to evaluate the source of indoor air detections (if any).
H&H will provide DEQ with a figure depicting the proposed sample locations prior to sampling
activities.
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5.0 Post-Occupancy Testing

The VIMS will initially be installed as a passive system which will use wind-driven turbine
ventilator fans. As such, post-occupancy differential pressure testing is not anticipated. If the
VIMS is converted to an active system based on indoor air assessment results, mitigation system
modifications and plans for additional indoor air sampling and long-term differential pressure
monitoring will be submitted to the DEQ Brownfields Program for approval prior to
implementation.

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6.0 Future Tenants & Building Uses

The future use of the proposed Site building is multi-family residential and non-residential
commercial tenant spaces. The VIMS accessible piping will be labeled with “Vapor Mitigation
– Contact Maintenance Dept.”, or similar, at intervals of no greater than 10-linear feet. If the
VIMS piping is exposed, damaged, altered, or repaired, the building maintenance department
will notify H&H, or a North Carolina Professional Engineer (PE), to provide oversight and
inspections in a similar manner as those described above. The PE will notify the DEQ
Brownfields Program of the changes or repairs and provide a report documenting the activities
for DEQ Brownfields record.

Long-term Monitoring
To monitor the long-term effectiveness of the VIMS and to evaluate whether active mitigation is
necessary, after the pre-occupancy indoor air sampling described in Section 4.0, post-occupancy
indoor air sampling will be completed annually for three consecutive years in a manner
consistent with the indoor air sampling methods detailed above. Note, if electrical fans are
installed based upon the results of the initial indoor air pre-occupancy testing, then sub-slab
differential pressure monitoring will be conducted in place of the post-occupancy annual indoor
air sampling. If the VIMS is converted to an active system, a revised plan for long-term
influence that include details regarding sub-slab differential testing will be submitted to DEQ for
review and concurrence.

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7.0 Reporting

Following confirmation that the mitigation system is installed, effective, and operating properly,
H&H will prepare a final vapor mitigation report. The report will include the final VIMS design
and specifications, as-built drawings, a summary of methodology and analytical results of the
indoor air samples collected during the various pre-occupancy sampling events, results of the
system effectiveness testing, a summary of VIMS inspections, inspection logs, pertinent figures,
photographs, and SDSs for materials used during construction. The report will be certified by a
North Carolina PE and will be submitted to DEQ for review.

SITE LOCATION MAP
HD SUPPLY BROWNFIELDS SITE
1425 WINNIFRED STREET CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE NO:
1-3-2019 0
1CCW-002
0 2000 4000
APPROXIMATE
SCALE IN FEET
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U.S.G.S. QUADRANGLE MAP7.5 MINUTE SERIES (TOPOGRAPHIC)
2923 S. Tryon Street, Suite 100
Charlotte, NC 28203
704.586.0007(p) 704.586.0373(f)
CHARLOTTE EAST, NORTH CAROLINA 1991
SITE
LEGEND
SITE PROPERTY BOUNDARY
REVISION NO. 0DATE: 1-3-2019
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JOB NO. CCW-002 FIGURE NO. 2
HD SUPPLY BROWNFIELDS SITE
1425 WINNIFRED STREET
CHARLOTTE, NORTH CAROLINA
SITE PLAN MAP
S. T
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NORTHERN TOWER
BUILDING UNDER
CONSTRUCTION
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2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
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Attachment 1
Vapor Mitigation System Plan Drawing – VM-1 - Revision 1
UPSTAIR #2COMMERCIAL06PACKAGEMAILLOBBYELEC.COMMERCIAL07COMMERCIAL08COMMERCIAL09COMMERCIAL10COMMERCIAL11COMMERCIAL12COMMERCIAL13COMMERCIAL14COMMERCIAL15ELECTRICALPUMPELEV#2VESTIBULESTORAGEDATAMECH.WOMEN'SMEN'SF-1F-2VIMS VAPOR LINER AND BASE COURSE (TYP)1VIMS SLOTTED COLLECTION PIPE (TYP)2BASE COARSE - CLEAN #57 (SEE SPECIFICATION #1)MIN 5" THICK BENEATH VMS VAPOR LINERVAPOR LINER (SEE SPECIFICATION #1)3" SCH 40 THREADED FLUSH JOINT SLOTTED PVC PIPE(0.020" SLOT WIDTH, 1/8" SLOT SPACING) WITH FILTERSOCK SET WITHIN MIN 5" BASE COURSE. INSTALL BASECOURSE APPROX. 1-INCH ABOVE AND BELOW THECOLLECTION PIPE.VAPOR LINER (SEE SPECIFICATION #1)CONCRETE FLOOR SLABSUB-BASESUBBASENTSNTSVM1VM1VMS TURBINE VENTILATOR FAN & EXHAUST (TYPICAL)8VM1NTSTURBINE FAN(EMPIRE MODEL TV04SS OR APPROVED EQUIVALENT)ELECTRICAL JUNCTION BOX FOR POTENTIALFUTURE VACUUM FAN (RADONAWAY RP145FAN OR APPROVED EQUIVALENT) SCH 40 PVC PIPE THROUGH ROOF. REFERTO VIMS LAYOUT FOR RISER PIPE SIZE. (FOR3" PIPE, USE 4" TO 3" REDUCER FOR AT FANCONNECTION)FLASHINGROOFTOPFLOOR CLEANOUT, ADJUSTABLE,2" DIA ZURN INDUSTRIESMODEL #CO2450-PV2 (OR EQUIVALENT)WITH VANDAL PROOF SCREWSVAPOR LINER PENETRATIONSEALED TO PIPE PERMANUFACTURER INSTRUCTIONS2" PVC 90 DEGREE ELBOW2" VENT PIPEPROTECTION SCREENBASE COARSE(SEE SPECIFICATION #1)VMS PRESSURE MEASURING POINT (2")5NTSVM1VERTICAL RISER PIPE AT SLAB PENETRATIONNTS4"x3"x3" SCH40 PVC TEE4" SCH 40 PVC RISER DUCT PIPE(SEE SPECIFICATION #2 AND #4)BASE COARSE(SEE SPECIFICATION #1)SOLID TO SLOTTED 3" SCH 40PVC PIPE TRANSITION (SLIPCOUPLING OR THREADED JOINT)3" SCH 40 PVC SLOTTED PIPE4VM1TENANT WALL(NOT PRESENT IN ALL LOCATIONS)SOLID 2" SCH 40 PVCTYPICAL VMS LINER AT ELEVATOR PIT6NTSVM1VAPOR LINER SEALED PERMANUFACTURER INSTRUCTIONSVAPOR LINER TERMINATION AT TURNED DOWN SLAB7NTSVM1BASE COARSE(SEE SPECIFICATION #1)VAPOR LINER SEALED TOCONCRETE PER MANUFACTURERINSTRUCTIONSSUB-BASE(CREATE SEPARATION OF GRAVELBASE AT TURNED DOWN SLAB)EXPANSION JOINT BETWEENSOUTH TOWER ANDCONNECTOR BUILDING CONCRETE FOOTERVAPOR LINER SEALED PERMANUFACTURER INSTRUCTIONSWATERPROOFING (XYPEXPARGE COAT) INSTALLED PERMANUFACTURER INSTRUCTIONSELEVATOR SUMPBASE COARSE(SEE SPECIFICATION #1)3" SCH 40 PVC RISER DUCT PIPE. POSITIONRISER WITHIN TENANT STUD WALL ON UPPERFLOORS (SEE SPECIFICATION #2)SOLID TO SLOTTED 3" SCH 40 PVC PIPETRANSITION (SLIP COUPLING ORTHREADED JOINT)CMU WALL (GROUND FLOOR)3" SCH 40 PVC TEESLAB STEP (SEE STRUCTURAL PLANS)3" SCH 40 PVC 90DEGREE ELBOW3" SOLID SCH 40 PVC(SEE SPECIFICATION #5)VERTICAL RISER AT SLAB STEP (CMU WALL)3NTSVM1MECHANICAL ROOMVAPOR LINER SEALED TO PIPE ANDCONCRETE PER MANUFACTURERINSTRUCTIONSPUMP ROOMELECTRICAL ROOMVIMS PRESSURE MONITORING POINT - DETAIL VIEWNTSVM19VAPOR LINER PENETRATION SEALED TOPIPE PER MANUFACTURER INSTRUCTIONSFINISHED FLOOR VENEERFINISHED FLOOR SLAB2" SCH 40 PVC2" DRAIN EXPANSION TEST PLUGFLOOR CLEANOUT, ADJUSTABLE,2" DIA ZURN INDUSTRIESMODEL #CO2450-PV2 (OR EQUIVALENT)BASE COARSE(SEE SPECIFICATION #1)REFER TO DETAIL 9 FORCLEAN-OUT DETAILSUPUPSTAIR #1STAIR #2TRASHFITNESSLEASINGCOMMERCIAL01COMMERCIAL02COMMERCIAL03COMMERCIAL04COMMERCIAL05COMMERCIAL06PACKAGEMAILLOBBYELEC.COMMERCIAL07COMMERCIAL08COMMERCIAL09COMMERCIAL10COMMERCIAL11COMMERCIAL12 COMMERCIAL13COMMERCIAL14COMMERCIAL15ELECTRICALPUMPELEV#1ELEV#2VESTIBULEVESTIBULEDATAMECH.STORAGEDATAMECH.WOMEN'SMEN'SWOMEN'SMEN'SPROJECT A-1706APRIL 4, 2019LEGENDSLOTTED 3" DIA SCHEDULE 40 PVC PIPINGSOLID SCHEDULE 40 PVC PIPING (3" OR 4", REFER TO VIMS LAYOUT)EXTENT OF VAPOR BARRIERLOCATION OF TURNED DOWN SLABLOCATION OF VERTICAL RISER AND APPROXIMATE LOCATION OF TURBINE FAN ON ROOFTOPLOCATION OF PRESSURE MEASURING POINT (SEE DETAIL 5).NOTE:1.LAYOUT OF GROUND FLOOR SHOWN IN DRAWING. THIS VAPOR MITIGATION SYSTEM IS FOR THESOUTHWESTERN APARTMENTS ONLY.SITE PLAN LAYOUT1" = 40'OPEN AIRPARKING DECKGENERAL LOCATION OFVAPOR LINER AND EXTENTOF VIMS04/04/19VAPOR INTRUSION MITIGATION SYSTEM (VIMS) LAYOUT1" = 10'VAPOR INTRUSION MITIGATION SYSTEM (VIMS) SPECIFICATIONS1.VIMS VAPOR LINER SHALL BE DRAGO WRAP 20-MIL VAPOR BARRIER MANUFACTURED BY STEGO INDUSTRIES LLC(OR, EQUIVALENT ALTERNATIVE VAPOR LINER APPROVED BY THE ENGINEER). ALTERNATIVE VAPOR LINER (IFUSED) SHALL BE A POLYOLEFIN FILM DESIGNED TO PREVENT VAPOR MIGRATION THROUGH CONCRETESLABS-ON-GRADE AND SHALL HAVE THE FOLLOWING CHARACTERISTICS:·THICKNESS: 20-MIL MINIMUM·PUNCTURE RESISTANCE: 183.9 NEWTONS MINIMUM (PER TEST METHOD ASTM D4833)·TENSILE STRENGTH: 53.5 lbf/in MINIMUM (PER TEST METHOID ASTM D882)·PERMEANCE: 0.01 PERMS MAXIMUM (PER TEST METHOD ASTM F1249)THE VAPOR LINER SHALL BE INSTALLED AS SPECIFIED HEREIN AND PER MANUFACTURER INSTALLATION INSTRUCTIONS TO CREATE A CONTINUOUS LINER BELOW GROUND FLOOR SLABS AND ALONG RETAINING WALLSAND SLAB-ON-GRADE FOLDS. A MINIMUM 5-INCH THICK BASE COURSE CONSISTING OF CLEAN #57 (OR OTHERHIGH PERMEABILITY STONE APPROVED BY THE ENGINEER) SHALL BE INSTALLED BENEATH THE VIMS VAPOR LINER.2.VIMS PIPING SHALL NOT BE TRAPPED AND SHALL BE SLOPED A MINIMUM OF 18 UNIT VERTICAL IN 12 UNITSHORIZONTAL (1% SLOPE) TO GRAVITY DRAIN. SOLID SECTIONS OF HORIZONTAL COLLECTION PIPE SHALL BESUPPORTED TO PREVENT PIPE SAG OR LOW POINTS AND MAINTAIN 1% SLOPE TOWARD SLOTTED SECTIONS.HORIZONTAL COLLECTION PIPE SHALL CONSISTS OF 3" SCH 40 PVC (OR OTHERWISE NOTED IN THE DRAWINGS).PVC PIPE JOINTS SHALL BE CONNECTED USING PVC SOCKET COUPLINGS AND PVC GLUE. SUB-SLAB SLOTTEDVAPOR COLLECTION PIPE SHALL BE THREADED FLUSH JOINT 3" SCH 40 PVC PIPE WITH 0.020" SLOT WIDTH AND 18"SLOT SPACING. FABRIC FILTER SOCK SHALL BE INSTALLED OVER SLOTTED PIPE SECTIONS.3.SCH 40 PVC RISER DUCT PIPING SHALL BE INSTALLED TO CONNECT EACH SLAB PENETRATION LOCATION TO AROOFTOP EXHAUST DISCHARGE POINT WITH TURBINE FAN (SEE SPECIFICATION #4). A 4" RISER PIPE SHALL BEINSTALLED AT RISER LOCATION F-1, AND A 3" RISER PIPE SHALL BE INSTALLED AT RISER LOCATION F-2.ABOVE-SLAB RISER DUCT PIPE RUNS BETWEEN THE SLAB PENETRATION AND THE ROOFTOP EXHAUSTDISCHARGE SHALL BE INSTALLED PER APPLICABLE BUILDING CODE AND AS SPECIFIED IN THE CONSTRUCTIONDOCUMENTS AND DRAWINGS.4.SCH 40 PVC RISER DUCT PIPING SHALL EXTEND IN A VERTICAL ORIENTATION THROUGH THE BUILDING ROOF ANDTERMINATE A MINIMUM OF 2 FT ABOVE THE BUILDING ROOF LINE. EMPIRE MODEL TV04SS STAINLESS STEELTURBINE VENTILATOR FANS (OR APPROVED ALTERNATE) SHALL BE INSTALLED ON THE EXHAUST DISCHARGE ENDOF EACH RISER DUCT PIPE. EXHAUST DISCHARGE LOCATIONS SHALL BE A MINIMUM OF 10 FT FROM ANYOPERABLE OPENING OR AIR INTAKE INTO THE BUILDING. NOTE THAT FAN LOCATIONS ON THE ROOFTOPDEPICTED IN THE VAPOR MITIGATION PLAN MAY BE REPOSITIONED AS LONG AS THE NEW POSITION MEETS THEREQUIREMENTS PRESENTED ABOVE AND ARE APPROVED BY THE ENGINEER. AN ELECTRICAL JUNCTION BOX(120V, 60Hz AC REQUIRED) SHALL BE INSTALLED NEAR THE FAN LOCATION ON THE ROOFTOP FOR CONVERSIONTO ELECTRIC FANS, IF REQUIRED. ALL WIRING AND ELECTRICAL TO BE INSTALLED WITH APPLICABLE ELECTRICALCODES.5.ABOVE-SLAB ACCESSIBLE RISER DUCT PIPING SHALL BE PERMANENTLY IDENTIFIED BY MEANS OF A TAG ORSTENCIL AT A MINIMUM OF ONCE EVERY 10-LINEAR FT WITH "VAPOR MITIGATION - CONTACT MAINTENANCE DEPT".LABELS SHALL ALSO BE FIXED TO THE TURBINE VENTILATOR FANS IN AN ACCESSIBLE LOCATION ON THEROOFTOP.6.THE INTAKE SCREEN OF THE PRESSURE MONITORING POINTS SHOULD BE POSITIONED TO BE MINIMUM 5-FT AWAYFROM EXTERNAL WALLS.7.THIS VAPOR MITIGATION PLAN IS INTENDED TO BE USED FOR DIRECTION OF VIMS COMPONENT INSTALLATIONONLY AND IS NOT INTENDED TO GUIDE CONSTRUCTION OF STRUCTURAL COMPONENTS NOT RELATED TO THEVIMS. CONSTRUCTION CONTRACTOR SHALL VERIFY CONSISTENCY OF VIMS DETAILS WITH APPLICABLESTRUCTURAL, ARCHITECTURAL, MECHANICAL, & PLUMBING PLANS AND RESOLVE ANY INCONSISTENCIES PRIORTO VIMS INSTALLATION.OPEN AIRPARKING DECKSOUTH TRYONSTREETWINNIFREDSTREET4VM15VM15VM15VM13VM14" SCH 40 PVCRISER3" SCH 40 PVCRISER7VM1INSTALL TURNED DOWNSLAB TO SEAL VAPORLINER (SEE DETAIL 7)INSTALL 3" VENT CAP ATTHE ENDS OF PIPE (TYP.)COVER VENT PIPES WITHFILTER SOCKS, TYP. (SEEDETAIL 2)3" SCH 40 PVCTEE (TYP.)3" SCH 40 PVC 90DEGREE ELBLOW (TYP.)2VM111VM1VM1SEAL VAPOR LINER TO CONCRETEFOOTERS AND SLABS PERMANUFACTURER INSTRUCTIONS (TYP.)8VM16VM18VM1INSTALL 3" VENT CAP ATTHE ENDS OF PIPE (TYP.)SLAB STEP; REFER TOSTRUCTURAL DRAWINGSA333 WEST TRADE STREETRCHITECTURESUITE 200CHARLOTTE, NC 28202T 704.927.9900w w w. a x i o m a r c h i t e c t u r e . c o mVM-11425 WINNIFRED STREET
CHARLOTTE, NORTH CAROLINA
R A I L Y A R D A P A R T M E N T S
A C E N T R O C I T Y W O R K S D E V E L O P M E N T ISSUED FOR CONSTRUCTIONVAPOR INTRUSION MITIGATION PLAN PREPARED BY:2923 South Tryon Street-Suite 100Charlotte, North Carolina 28203704-586-0007(p) 704-586-0373(f)License # C-1269 / #C-245 GeologyH&H NO. CCW-001POSITION VERTICAL RISERON ELECTRICAL ROOMSIDE OF CMU WALLWINONA STREETBLAND STREET
POSITION CLEAN-OUT IN HALLWAY ANDPIPE INTAKE UNDERNEATHCOMMERCIAL SPACEVAPOR INTRUSIONMITIGATION SYSTEMPLAN & DETAILSREVISION 15VM15VM1S:\AAA-Master Projects\Centro CityWorks CCW\CCW-002 RailYard VMP\Figures\Railyard Apartments_VIMP_040419.dwg, 4/4/2019 1:50:53 PM, DWG To PDF.pc3

Attachment 2
Drago® Wrap Vapor Barrier Specification Sheet and Installation Instructions

Engineered protection to create a healthy built environment.
DRAGO® WRAP
VAPOR INTRUSION BARRIER
3-in-1 product solution
EXPOSURE PATHWAY – VAPOR INTRUSION
For brownfields and contaminated sites, the focus has historically been to protect human health by preventing
exposure to direct contact of contaminated soil or drinking contaminated water. We now know that inhaling
chemical vapors poses a potential risk to the health of residents, workers, and other occupants who are inside
of the buildings. (Source: EPA)
A VAPOR INTRUSION BARRIER SOLUTION with Unsurpassed Permeation Coefficients
Drago Wrap Vapor Intrusion Barrier is a multi-layered plastic extrusion that combines uniquely
designed materials with only high grade, prime, virgin resins. This patent pending barrier tech-
nology provides high performance and longevity, allowing for the redevelopment of contaminated
sites, creating a healthy built environment.
A cost effective 3-in-1 product solution providing unsurpassed protection from
chlorinated solvents, hydrocarbons, and moisture vapor.
Migration of Soil Vapors to Indoor Air
Both diffusion and advection can draw unwanted chemicals into the building envelope. Regardless of
the path that soil vapors can take, experts agree that a monolithic layer of protection like the Drago
Wrap Vapor Intrusion Barrier System is critical to controlling the transmission of these chemicals
into the building.
WATER TABLESOIL VAPORMIGRATION
SOIL CONTAMINATEDWITH VOCs GROUNDWATER PLUMEOF VOCs
VAPOR INTRUSIONTHROUGH THEFOUNDATION SLAB
WATER TABLESOIL VAPORMIGRATION
SOIL CONTAMINATEDWITH VOCs GROUNDWATER PLUMEOF VOCs
DRAGO WRAP VAPOR INTRUSION BARRIER
Vapor-forming chemicals may include:
• Volatile organic compounds (VOCs), such as
trichloroethylene and benzene.
• Select semivolatile organic compounds,
such as naphthalene.
This exposure pathway, known as vapor
intrusion, is the movement of chemical
vapors from the soil and groundwater
into the building envelope.
• In extreme examples, there is a risk of fire
or explosion.
• Other times, at levels with a detectable odor,
there may be acute short-term health issues
such as nausea, headache, and respiratory
irritation.
• More commonly though, long-term exposure
to even low-levels of certain chemical vapors
may increase the risk of chronic health effects,
such as cancer.
Drago Wrap Vapor Intrusion Barrier is the next game-changing barrier technology from the
creators of Stego® Wrap Vapor Barrier, the most widely-specified below-slab moisture vapor
barrier in North America.*
(Source: EPA)
“It is estimated that there are more than 450,000 brownfields in the U.S.”
– www.epa.gov/brownfields
WATER TABLESOIL VAPORMIGRATION
SOIL CONTAMINATEDWITH VOCs GROUNDWATER PLUMEOF VOCs
VAPOR INTRUSIONTHROUGH THEFOUNDATION SLAB
WATER TABLESOIL VAPORMIGRATION
SOIL CONTAMINATEDWITH VOCs GROUNDWATER PLUMEOF VOCs
DRAGO WRAP VAPOR INTRUSION BARRIER
Extensive testing✓

Drago Wrap is specifically engineered to serve as a barrier to volatile organic compounds (VOCs). Through
patented and trade secret processes, Drago Wrap combines engineered barrier materials with the flexibility
and strength of a high-performance polyolefin film into an easy-to-install barrier against hydrocarbons and
chlorinated solvents.
TESTED – PROVEN EFFECTIVENESS
Extensive, independent testing proved Drago Wrap’s effectiveness in attenuating hydrocarbons and chlorinated
solvents. For more information on our independent testing, please contact Stego Industries’ Technical
Department or visit our website at www.stegoindustries.com.*
FEATURES BENEFITS
Independent, university testing
Made from game-changing resin technology
and provides high performance and longevity
Installation methodology derived from extensive
lab and field work based on the principles found in
ASTM E1643 and finally validated through pressure
stress testing of simulated installations
20-mil, multi-layer material
14 ft wide rolls
ASTM E1745 compliant
Efficacy testing for hydrocarbons, chlorinated
solvents, and other soil gases (radon, methane)
Allows Developers, Owners, and Engineers to
redevelop brownfield sites and create a healthy
built environment
Fully intact, dependable installation
Exceptional durability as a result of robust physical
properties
Minimize seams
Designed to be installed below concrete slabs in
commercial, residential, and industrial applications
DRAGO WRAP IS ENGINEERED TO SERVE AS A BARRIER TO VOLATILE ORGANIC COMPOUNDS
BENEFITS OF THE DRAGO WRAP
VAPOR INTRUSION BARRIER SYSTEM
COMPLETE PROTECTIONWith Drago’s Full Line of Accessory Products
DragoINSTALLATION
Installation methodology derived from extensive lab and field work based on the principles found
in ASTM E1643 and validated through pressure stress testing of simulated installations demon-
strates Drago Wrap’s ability to produce a fully intact, dependable installation.
As with any protection system, the installation of Drago Wrap is critical to the system’s effective-
ness. Drago Wrap and Drago Accessories make it easy to complete a successful installation.
Refer to the complete Drago Wrap Installation
Instructions and Warranty Information on the
website: www.stegoindustries.com.*
DragoSUPPORT
Our North American network of Stego employ-
ees, representatives, and distributors ensure that
the products we bring to market are both readily
available and accompanied with excellent technical
knowledge and field support when you need it.*
To learn more about this new game-changing technology, contact us to get in touch with the
nearest Stego representative.* We look forward to working with you on your next project.
www.stegoindustries.com | 877-464-7834
Tel: [phone] | Toll Free: 877-464-7834 | www.stegoindustries.com
* Stego Industries, LLC is the exclusive Representative for all products, including Drago® Wrap and accessory products, owned by Stego Technology, LLC, a wholly independent company from Stego Industries, LLC. Drago, the Drago logo, and DragoTack are deemed to be registered and/or protectable trademarks of Stego Technology, LLC. Stego and the stegosaurus logo, are deemed to be registered and/or protectable trademarks of Stego Industries, LLC. © 2017 Stego Industries, LLC. All Rights Reserved. Installation and Warranty Information: www.stegoindustries.com/legal. 9/2017
Drago® Tape
This pressure-sensitive
adhesive, coupled with the
same uniquely designed
materials as Drago Wrap,
make it ideal for sealing
Drago Wrap seams and
penetrations.
DragoTack™ Tape
A solvent-resistant,
double-sided adhesive
strip used to bond and
seal Drago Wrap to
concrete, masonry,
wood, metal, and other
surfaces.
Drago® Sealant
A two-component,
high performance epoxy,
designed to be used with
Drago Wrap, for sealing
utility and pipe penetra-
tions.
Drago® Sealant Form
A low-density, cross-
linked, closed-cell
polyethylene foam
designed to be used as
a detailing piece with
Drago Sealant.

Stego is involved in the research, design, development, production and distribution of the highest quality construction products in the industry. Stego’s technical department
offers technical advice and additional information regarding the specific properties of all Stego products. Based on the department's experience, understanding of relevant
scientific principles, and knowledge of current industry expert recommendations, Stego can advise on issues related to utility versus cost in order to assist in creating installation best practices. However, Stego does not employ design professionals. Therefore, Stego cannot interpret ASTM installation standards (E1643) and must defer to the project’s
assigned design professional on final design decisions. Version 1.1 | Last Update: October 25, 2017 I Created: September 12, 2017

DRAGO® WRAP VAPOR INTRUSION BARRIER
SUMMARY OF PERMEATION AND ATTENUATION TESTING

Stego Industries, LLC is the exclusive Representative for all products, including Drago® Wrap and accessory products, owned and
developed by Stego Technology, LLC, a wholly independent company from Stego Industries, LLC. Drago, the Drago logo, and
DragoTack are deemed to be registered and/or protectable trademarks of Stego Technology, LLC. © 2017 Stego Industries, LLC. All
Rights Reserved. Installation, Warranty and State Approval Information: www.stegoindustries.com/legal.

stegoindustries.com

1
BACKGROUND
Commencing in 2015 and continuing indefinitely, Drago Wrap Vapor Intrusion Barrier has been subjected to a series of
permeation tests. This testing was designed—and has been subsequently overseen—by an expert in the permeation
of volatile organic compounds (VOCs) at a prominent university. The results of this testing have been used to
empirically determine the attenuation efficacy (i.e. the permeation coefficients) of Drago Wrap against various
hydrocarbons and chlorinated solvents. The purpose of this document is to summarize and explain the robust and
ongoing testing protocol utilized and to relay the current results.

CHEMICALS TESTED
Drago Wrap has been/is being tested with regard to permeation of the following chemicals: TCE; PCE; the BTEX family:
Benzene, Toluene, Ethylbenzene, Xylene; Dichloromethane; 1,4 Dichlorobenzene; Methyl tert-butyl ether (MTBE) and
Naphthalene.

TESTING METHODOLOGY
The tests utilize stainless steel diffusion cells as depicted in Figures 1 and 2. The diffusion cells create two chambers—a
source chamber and receptor chamber—that are separated by the membrane under investigation. The source
chamber is populated by the permeant (chemical) under consideration and diffuses across the membrane toward the
receptor chamber. In this setup, the membrane—Drago Wrap—is the only barrier preventing chemicals from reaching
the receptor chamber. Periodic sampling of both the source and receptor chambers of the diffusion cell allows for Gas
Chromatography, Mass Spec (GC/MS) analysis of the airspace on either side of the membrane. Complex physics,
mathematics and numerical modeling of the GC/MS data yield the permeation coefficients seen in
Table 1. Testing, as alluded, is ongoing; the concentrations in the diffusion cells will be monitored indefinitely, numerical
models utilized and results updated accordingly.

Figure 1 Figure 2

Stego is involved in the research, design, development, production and distribution of the highest quality construction products in the industry. Stego’s technical department
offers technical advice and additional information regarding the specific properties of all Stego products. Based on the department's experience, understanding of relevant
scientific principles, and knowledge of current industry expert recommendations, Stego can advise on issues related to utility versus cost in order to assist in creating installation best practices. However, Stego does not employ design professionals. Therefore, Stego cannot interpret ASTM installation standards (E1643) and must defer to the project’s
assigned design professional on final design decisions. Version 1.1 | Last Update: October 25, 2017 I Created: September 12, 2017

DRAGO® WRAP VAPOR INTRUSION BARRIER
SUMMARY OF PERMEATION AND ATTENUATION TESTING

Stego Industries, LLC is the exclusive Representative for all products, including Drago® Wrap and accessory products, owned and
developed by Stego Technology, LLC, a wholly independent company from Stego Industries, LLC. Drago, the Drago logo, and
DragoTack are deemed to be registered and/or protectable trademarks of Stego Technology, LLC. © 2017 Stego Industries, LLC. All
Rights Reserved. Installation, Warranty and State Approval Information: www.stegoindustries.com/legal.

stegoindustries.com

2
The discrete layers that make up Drago Wrap were tested to determine their respective permeation coefficients. The
results obtained from the mathematical modeling of these tests do not necessarily equate to the values obtained from
whole-film permeation testing. In other words, the membrane appears to benefit from a synergistic effect; the whole is
greater than the sum of its parts. The results in Table 1 come from the most conservative approach to analyzing the
results and do not take into account these synergies.

RESULTS
The values displayed in Table 1 result from a combination of data generated from several phases of testing and
numerical modeling.

Table 1
Chemical Abbreviation Family Use Upper-Bound Permeation, Pg
[x 10-13 m2/s]
Benzene Btex Aromatic Hydrocarbon Gasoline byproduct 4.5
Toluene bTex Aromatic Hydrocarbon Gasoline byproduct 5.1
Ethylbenzene btEx Aromatic Hydrocarbon Gasoline byproduct 3.1
M&P-Xylenes bteX Aromatic Hydrocarbon Gasoline byproduct 2.9
O-Xylene bteX Aromatic Hydrocarbon Gasoline byproduct 2.7
Methyl tert-butyl ether MTBE Oxygenate Octane-increasing additive to fuel 0.012
Trichloroethylene TCE Chlorinated Hydrocarbon Dry Cleaning and Solvent 1.5
Tetrachloroethylene PCE Chlorinated Hydrocarbon Dry Cleaning and Solvent 3.0
Dichloromethane DCM Chlorinated Hydrocarbon Paint Stripper, Decaffeinater, Aerosol propellant 4.5
1,4-Dichlorobenzne 1,4-DCB Chlorinated Hydrocarbon Pesticide, Disinfectant, Deodorant 7.1
Naphthalene Naphthalene Polycyclic Aromatic
Hydrocarbon Fumigant, Pyrotechnics, Wetting Agent 0.25

P1 OF 2
DRAGO® WRAPVAPOR INTRUSION BARRIER
A STEGO TECHNOLOGY, LLC INNOVATION | VAPOR RETARDERS 07 26 00, 03 30 00 | VERSION: 06/23/2017
1. PRODUCT NAME
DRAGO WRAP VAPOR INTRUSION BARRIER
2. MANUFACTURER
c/o Stego® Industries, LLC*
216 Avenida Fabricante, Suite 101
San Clemente, CA 92672
Sales, Technical Assistance
Ph: [phone]
Fx: [phone]
www.stegoindustries.com
3. PRODUCT DESCRIPTION
TABLE 4.1: PHYSICAL PROPERTIES OF DRAGO WRAP VAPOR INTRUSION BARRIER
PROPERTY TEST RESULTS
Under Slab Vapor Retarders ASTM E1745 – Standard Specification for Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs ASTM E1745 Compliant
Water Vapor Permeance ASTM F1249 – Test Method for Water Vapor Transmission Rate Through Plastic 0.0069 perms Film and Sheeting Using a Modulated Infrared Sensor [gr/(ft2*hr*in-Hg)]
Push-Through Puncture ASTM D4833 – Test Method for Index Puncture Resistance of Geotextiles, Geomembranes, and Related Products 183.9 Newtons
Tensile Strength ASTM D882 – Test Method for Tensile Properties of Thin Plastic Sheeting 53.5 lbf/in
Permeance After Conditioning ASTM E154 Section 8, F1249 – Permeance after wetting, drying, and soaking 0.0073 perms(ASTM E1745 ASTM E154 Section 11, F1249 – Permeance after heat conditioning 0.0070 permsSections 7.1.2 - 7.1.5) ASTM E154 Section 12, F1249 – Permeance after low temperature conditioning 0.0062 perms ASTM E154 Section 13, F1249 – Permeance after soil organism exposure 0.0081 perms
Hydrocarbon Attenuation Factors Contact Stego Industries’ Technical Department
Chlorinated Solvent Attenuation Factors Contact Stego Industries’ Technical Department
Methane Transmission Rate ASTM D1434 – Test Method for Determining Gas Permeability Characteristics of 7.0 GTR Plastic Film and Sheeting (mL(STP)/m2*day)
Radon Diffusion Coefficient K124/02/95 9.8 x 10-14 m2/second
Thickness 20 mils
Roll Dimensions 14' x 105' or 1,470 ft2
Roll Weight 150 lbs
USES: Drago Wrap is specifically engineered to attenuate volatile organic compounds (VOCs) and serve as a below-slab
moisture vapor barrier.
COMPOSITION: Drago Wrap is a multi-layered plastic extrusion that combines uniquely designed materials with only
high grade, prime, virgin resins.
ENVIRONMENTAL FACTORS: Drago Wrap can be used in systems for the control of various VOCs including hydrocarbons,
chlorinated solvents, radon, methane, soil poisons, and sulfates.
4. TECHNICAL DATA
Continued... Note – legal notice on page 2.
DRAGO® WRAPVAPOR INTRUSION BARRIER
A STEGO TECHNOLOGY, LLC INNOVATION | VAPOR RETARDERS 07 26 00, 03 30 00 | VERSION: 06/23/2017
DATA SHEETS ARE SUBJECT TO CHANGE. FOR MOST CURRENT VERSION, VISIT WWW.STEGOINDUSTRIES.COM
[phone] | www.stegoindustries.com
* Stego Industries, LLC is the exclusive Representative for all products, including Drago® Wrap and accessory products, owned by Stego Technology, LLC, a wholly independent company from Stego Industries, LLC. Drago, the Drago logo, and DragoTack are deemed to be registered and/or protectable trademarks of Stego Technology, LLC. Stego and the stegosaurus logo, are deemed to be registered and/or protectable trademarks of Stego Industries, LLC. © 2017 Stego Industries, LLC. All Rights Reserved. Installation and Warranty Information: www.stegoindustries.com/legal.
5. INSTALLATION
UNDER SLAB: Unroll Drago Wrap over a tamped aggregate, sand, or earth base. Overlap all seams a minimum of 12
inches and tape using Drago® Tape. All penetrations must be sealed using a combination of Drago Wrap and Drago
Accessories.
Review Drago Wrap’s complete installation instructions prior to installation.
6. AVAILABILITY & COST
Drago Wrap is available nationally through our network of building supply distributors. For current cost information,
contact your local Drago distributor or Stego Industries’ Sales Representative.
7. WARRANTY
Stego Industries, LLC believes to the best of its knowledge, that specifications and recommendations herein are
accurate and reliable. However, since site conditions are not within its control, Stego Industries does not guarantee
results from the use of the information provided and disclaims all liability from any loss or damage. Stego Technology,
LLC does offer a limited warranty on Drago Wrap. Please see www.stegoindustries.com/legal.
8. MAINTENANCE
Store Drago Wrap in a dry and temperate area.
9. TECHNICAL SERVICES
Technical advice, custom CAD drawings, and additional information can be obtained by contacting Stego Industries or
by visiting the website.
Contact Number: [phone]
Website: www.stegoindustries.com
10. FILING SYSTEMS
• www.stegoindustries.com
• Buildsite
P2 OF 2
INSTALLATIONINSTRUCTIONS
DRAGO® WRAP
VAPOR INTRUSION BARRIER
Engineered protection to create a healthy built environment.
1. Drago Wrap has been engineered to be installed over a tamped
aggregate, sand, or earth base. It is not typically necessary
to have a cushion layer or sand base, as Drago Wrap is tough
enough to withstand rugged construction environments.
NOTE: Drago Wrap must be installed with the gray facing the
subgrade.
2. Unroll Drago Wrap over the area where the slab is to be placed.
Drago Wrap should completely cover the concrete placement
area. All joints/seams both lateral and butt should be overlapped
a minimum of 12 inches and taped using Drago® Tape. (Fig. 1)
NOTE: The area of adhesion should be free from dust, dirt, moisture, and frost to allow maximum adhesion of the pressure-sensitive tape.
Ensure that all seams are taped with applied pressure to allow for maximum and continuous adhesion of the pressure-sensitive Drago
Tape.
3. ASTM E1643 requires sealing the perimeter of the slab. Extend
vapor retarder over footings and seal to foundation wall or
grade beam at an elevation consistent with the top of the slab
or terminate at impediments such as waterstops or dowels.
Consult the structural and environmental engineer of record
before proceeding.
IMPORTANT: Please read these installation instructions completely, prior to beginning any Drago Wrap installation. The following installation
instructions are generally based on ASTM E1643 – Standard Practice for Selection, Design, Installation, and Inspection of Water Vapor Retarders
Used in Contact with Earth or Granular Fill Under Concrete Slabs. There are specific instructions in this document that go beyond what is stated in
ASTM E1643 to take into account vapor intrusion mitigation. If project specifications call for compliance with ASTM E1643, then be sure to review
the specific installation sections outlined in the standard along with the techniques referenced in these instructions.
DRAGO TAPE
Minimum 12” overlap
VAPOR INTRUSION BARRIER
Fig.1: UNDER-SLAB INSTALLATION
UNDER-SLAB INSTRUCTIONS:
FOOTING
DRAGOTACK TAPE
VAPOR INTRUSION BARRIER
Fig.2a: SEAL TO PERIMETER WALL Fig. 2b: SEAL TO FOOTING
FOOTING
DRAGOTACK TAPE
VAPOR INTRUSION BARRIER
SEAL TO PERIMETER WALL OR FOOTING WITH
DRAGOTACK™ TAPE: (Fig. 2a and 2b)
a. Make sure area of adhesion is free of dust,
dirt, debris, moisture, and frost to allow
maximum adhesion.
b. Remove release liner on one side and stick to
desired surface.
c. When ready to apply Drago Wrap, remove the
exposed release liner and press firmly against
DragoTack Tape to secure.
Continued ... Note - legal notice on page 3
DRAGO® WRAP VAPOR INTRUSION BARRIERINSTALLATION INSTRUCTIONS
P1 of 3
Continued ... Note - legal notice on page 3
DRAGO® WRAP VAPOR INTRUSION BARRIERINSTALLATION INSTRUCTIONS
P2 of 3
DETAIL PATCH FOR PIPE PENETRATION SEALING: (Fig. 4b)
a. Install Drago Wrap around pipe penetrations by slitting/cutting material as needed. Try to minimize void space
created.
b. If Drago Wrap is close to pipe and void space is minimized, proceed to step d.
c. If void space exists, then
i. Cut a detail patch to a size and shape that creates a 6-inch overlap on all edges around the void space at
the base of the pipe.
ii. Cut an “X” slightly smaller than the size of the pipe diameter in the center of the detail patch and slide
tightly over pipe.
iii. Tape the edges of the detail patch using Drago Tape. d. Seal around the base of the pipe using Drago Tape and/or Drago Sealant and Drago Sealant Form.
i. If Drago Sealant is used to seal around pipe, make sure Drago Wrap is flush with the base of the
penetration prior to pouring Drago Sealant.
5. IMPORTANT: ALL PENETRATIONS MUST BE SEALED. All pipe, ducting, rebar, and block outs should be sealed using
Drago Wrap, Drago Tape, and/or Drago® Sealant and Drago® Sealant Form. (Fig. 4a)
DRAGO TAPE
DAMAGED AREA
DRAGO TAPE DRAGO TAPE
SMALL HOLE
VAPOR INTRUSION BARRIER
VAPOR INTRUSION BARRIER VAPOR INTRUSION BARRIER VAPOR INTRUSION BARRIER
Fig. 3: SEALING DAMAGED AREAS
4. In the event that Drago Wrap is damaged during or after installation, repairs must be made. Cut a piece of Drago Wrap
to a size and shape that covers any damage by a minimum of 6 inches in all directions. Clean all adhesion areas of dust,
dirt, moisture, and frost. Tape down all edges using Drago Tape. (Fig. 3)
MINIMAL VOID SPACE CREATED
DRAGO SEALANTDRAGO TAPE
OR DRAGO SEALANT FORM
VAPOR INTRUSION BARRIER VAPOR INTRUSION BARRIER VAPOR INTRUSION BARRIER
Fig. 4a: PIPE PENETRATION SEALING
DRAGO TAPE
LARGE VOID SPACE CREATED
DRAGO SEALANTDRAGO TAPE
OR DRAGO SEALANT FORM
VAPOR INTRUSION BARRIERVAPOR INTRUSION BARRIERVAPOR INTRUSION BARRIER
VAPOR INTRUSION BARRIER
Fig. 4b: DETAIL PATCH FOR PIPE PENETRATION SEALING
STEGO INDUSTRIES, LLC • SAN CLEMENTE, CA • 949-257-4100 • 877-464-7834 • www.stegoindustries.com
Stego Industries, LLC is the exclusive Representative for all products, including Drago® Wrap and accessory products, owned by Stego Technology, LLC, a wholly independent company from Stego Industries, LLC. Drago, the Drago logo, and DragoTack are deemed to be registered and/or protectable trademarks of Stego Technology, LLC. Stego and the stegosaurus logo, are deemed to be registered and/or protectable trademarks of Stego Industries, LLC. © 2017 Stego Industries, LLC. All Rights Reserved. Installation and Warranty Information: www.stegoindustries.com/legal. 6/2017
NOTE: While Drago Wrap installation instructions are based on ASTM E1643 - Standard Practice for Selection, Design, Installation, and Inspection of Water Vapor Retarders Used in Contact with Earth or Granular Fill Under Concrete Slabs, these instructions are meant to be used as a guide, and do not take into account specific job site situations. Consult local building codes and regulations along with the building owner or owner’s representative before proceeding. If you have any questions regarding the above-mentioned installation instructions or products, please call us at 877-464-7834 for technical assistance. While Stego Industries’ employees and representatives may provide technical assistance regarding the utility of a specific installation practice or Stego product, they are not authorized to make final design decisions.
MULTIPLE PIPE PENETRATION SEALING: (Fig. 5)
NOTE: Multiple pipe penetrations in close proximity may be most efficiently sealed using Drago Wrap, Drago Sealant,
and Drago Sealant Form for ease of installation.
a. Cut a hole in Drago Wrap such that the membrane fits over and around the base of the pipes as closely as
possible, ensuring that it is flush with the base of the penetrations.
b. Install Drago Sealant Form continuously around the entire perimeter of the group of penetrations and at least
1 inch beyond the terminating edge of Drago Wrap.
c. Pour Drago Sealant inside of Drago Sealant Form to create a seal around the penetrations.
d. If the void space between Drago Wrap and the penetrations is not minimized and/or the base course allows for
too much drainage of sealant, a second coat of Drago Sealant may need to be poured after the first application
has cured.
IMPORTANT: AN INSTALLATION COMPLETED PER THESE INSTRUCTIONS SHOULD CREATE A MONOLITHIC MEMBRANE
BETWEEN ALL INTERIOR INTRUSION PATHWAYS AND VAPOR SOURCES BELOW THE SLAB AS WELL AS AT THE SLAB
PERIMETER. THE UNDERLYING SUBBASE SHOULD NOT BE VISIBLE IN ANY AREA WHERE CONCRETE WILL BE PLACED.
ADDITIONAL INSTALLATION VALIDATION CAN BE DONE THROUGH SMOKE TESTING. SEE DRAGO WRAP VAPOR INTRUSION
SYSTEM SMOKE TESTING FIELD GUIDE FOR ADDITIONAL CONSIDERATIONS.
Stego Industries recommends the use of BEAST vapor barrier-safe concrete accessories,
to help eliminate the use of non-permanent penetrations in Drago Wrap installations.
MINIMAL VOID SPACE CREATED
DRAGO SEALANT
DRAGO SEALANT FORM DRAGO SEALANT FORM DRAGO SEALANT FORM
DRAGO SEALANT
VAPOR INTRUSION BARRIER VAPOR INTRUSION BARRIER VAPOR INTRUSION BARRIER VAPOR INTRUSION BARRIER
Fig. 5: MULTIPLE PIPE PENETRATION SEALING
BEAST® CONCRETE ACCESSORIES - VAPOR BARRIER SAFE
BEAST® FOOT
FORMING UTILITY
BEAST® SCREED BEAST® HOOK
DRAGO® WRAP VAPOR INTRUSION BARRIERINSTALLATION INSTRUCTIONS
P3 of 3

Attachment 3
VIMS Components Product Specification Sheets
TURBINE VENTILATORS
CONSTRUCTION SPECIFICATIONS
“A”
THROAT SIZE
GUAGE NO. OF
BRACES
BRACE
MATERIALCROWN GALV.BLADE GALV.THROAT GALV.
4 24 28 26 3 ALUMINUM
6 24 28 26 3 ALUMINUM
8 24 28 26 3 ALUMINUM
10 24 28 26 3 ALUMINUM
12 24 28 24 3 ALUMINUM
14 22 26 24 3 ALUMINUM
16 22 26 24 3 STEEL
18 22 26 24 4 STEEL
20 20 26 24 4 STEEL
24 20 26 22 4 STEEL
DIMENSIONAL AND PERFORMACE DATA
“A”
THROAT SIZE
“B”
HEIGHT
“C”
OVERALL WIDTH
EXHAUSTED
CAPACITY*
APPROX.
SHIPPING WEIGHT
4 12 10 1/4 125 5
6 14 1/2 12 3/4 147 7
8 15 14 1/4 255 8
10 16 1/4 16 1/4 425 11
12 17 19 631 13
14 19 3/4 22 3/4 700 21
16 21 3/4 25 1/2 950 31
18 24 29 1200 38
20 25 1/4 31 5/8 1700 46
24 28 1/4 35 3/4 2350 58
*4 MPHWIND CFM

Attachment 4
Select Indoor Air Sampling VOC Constituent List

Attachment 1
Select Indoor Air Sampling VOC Constituent List
HD Supply Brownfields Site
Railyard Apartments
145 Winnifred Street
Charlotte, North Carolina
H&H Job No. CCW-002
Select VOCs by TO-15
Acetone
Benzene
1,3-Butadiene
2-Butanone
Carbon Disulfide
Carbon Tetrachloride
Chloroethane
Chloroform
Chloromethane
Cyclohexane
1,3-Dichlorobenzene
Dichlorodifluoromethane
1,2-Dichloropropane
Ethanol
Ethyl Acetate
Ethylbenzene
4-Ethyltoluene
Heptane
Hexane
Isopropanol
Methylene Chloride
4-Methyl-2-pentanone
Naphthalene
Propene
Styrene
Tetrachloroethene
Toluene
Trichloroethene
Trichlorofluoromethane
1,1,2-Trichloro-1,2,2-trifluoroethane
1,2,4-Trimethylbenzene
1,3,5-Trimethylbenzene
Vinyl Chloride
m&p-Xylene
o-Xylene
S:\AAA-Master Projects\Centro CityWorks CCW\CCW-002 RailYard VMP\Attachment 1
3/12/2019
Table 1
Hart & Hickman, PC