19054_HD Supply_VIMS Modification Request_2021.03.18

March 18, 2021

Sent Via E-mail
Mr. Trinh DeSa, PE Hart & Hickman, PC 2923 S. Tryon, Ste 100
Charlotte, NC, 28203 [e-mail] Subject: Vapor Intrusion Mitigation Plan Modification Request HD Supply (Railyard Apartments)
Charlotte, Mecklenburg County Brownfields Project No. 19054-15-060
Dear Mr. DeSa:
The North Carolina Department of Environmental Quality Brownfields Program (NC Brownfields) received and reviewed the Request for VIMP Modifications dated March 11, 2021, and DEQ Brownfields has found this VIMP Modification Request to be in compliance with Land Use Restriction 15.f.iii. of the Notice of Brownfields Property and DEQ approval of the VIMP was provided by email on March 18, 2021.
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, the safe occupancy of the building will be evaluated upon “Post-
Construction and Pre-Occupancy System Effectiveness Testing” as required by Section 4.0 of the VIMP. 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.
Trinh DeSa, PE
March 18, 2021 Page 2

If you have any questions, please feel free to contact me at 980-435-3657 (mobile), or via
e-mail at [e-mail]

Sincerely,
J. Kevin Slaughter Environmental Specialist II, Brownfields Property Management Unit
Division of Waste Management
ec: Bruce Nicholson - NC Brownfields Program Manager Carolyn Minnich - NC Brownfields Andrew Besu – H&H

Via Email
March 11, 2021
NCDEQ – Division of Waste Management Brownfields Program 1646 Mail Service Center Raleigh, NC 27699-1646
Attn: Mr. Kevin Slaughter Re: Request for VIMP Modifications HD Supply – Railyard Apartments 1425 Winnifred Street
Charlotte, Mecklenburg County, North Carolina Brownfields Project No. 19054-15-060 H&H Project No. CTT-001
Dear Kevin: Hart & Hickman, PC (H&H) has prepared this letter to request approval for vapor intrusion
mitigation plan (VIMP) modifications for the Railyard Apartments at the HD Supply Brownfields
property (Brownfields Project No. 19054-15-060) located at 1425 Winnifred Street in Charlotte,
Mecklenburg County, North Carolina (Site). An existing residential apartment building is located
at the Site that contains commercial retail spaces on the ground floor. The southern wing of the
existing apartment building contains a vapor intrusion mitigation system (VIMS) as detailed in the
DEQ-approved H&H Vapor Intrusion Mitigation Plan – Revision 1 dated May 30, 2019.
Construction of the building was completed in 2020 and the VIMS installation was summarized
in the H&H Vapor Intrusion Mitigation System Installation Report dated May 26, 2020.

At the time of the report submittal, each of the ground floor commercial areas in the southern wing
of the building contained a concrete slab, but tenants did not occupy all of the spaces. Tenant upfit
activities in Commercial Space 12, located in the southwestern corner of the building, began in
February 2021. During upfit activities, new utilities were installed in select areas of the space that
required removal of portions of the existing concrete slab. The new utilities being installed in this
Mr. Kevin Slaughter March 11, 2021
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space are located in the path of the existing VIMS sub-slab vent piping. Therefore, the following
modifications to the VIMP are requested to allow for installation of the new utilities while
maintaining the effectiveness of the existing VIMS.

The requested modifications of this VIMP in Commercial Space 12 include:
1. use of Raven Industries VaporBlock®-20 Plus (VBP-20) 20-mil vapor barrier to repair
sections of the existing vapor barrier (Attachment 1), and
2. a minor correction to the existing sub-slab vent pipe layout to bypass the new utilities while
maintaining an interconnected vent pipe below the tenant space and to the existing VIMS
riser.

Modification #1
The existing VIMS contains Stego Industries Drago Wrap (Drago), a 20-mil ASTM-certified
chemically resistant polyolefin plastic vapor barrier. In order to install the new utilities during the
upfit activities, portions of the existing vapor barrier had to be removed. This modification
requests replacing the removed portions of the vapor barrier with the VBP-20, which is also a 20-
mil ASTM-certified chemically resistant polyolefin plastic vapor barrier that is equivalent to
Drago. Raven Industries sealants and tapes will be used to seal the new VBP-20 to the existing
Drago to create a continuous vapor barrier within the commercial space. Specifically, the new
vapor barrier will be overlapped with the existing vapor barrier and will be sealed using a double-
sided butyl tape and a single-sided gas barrier tape manufactured by Raven Industries. The Raven
Industries tapes are designed to seal polyolefin plastics and thus will effectively seal both the
Drago and VBP-20 vapor barriers.

Future upfit activities in Commercial Space 12, or other commercial spaces within the southern
wing of the building, may occur that warrant similar minor repairs to the vapor barrier. Therefore,
H&H further requests that this vapor barrier modification be allowed for the current upfit activities
and future upfit activities within the building, if warranted.

Mr. Kevin Slaughter March 11, 2021
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Modification #2
In order to avoid interference of the new sub-slab utilities and the existing VIMS vent pipe, this
modification includes making a slight change to the location of the 4” Sch 40 PVC sub-slab vent
pipe. The proposed layout is depicted on Sheet VM-1 (Attachment 2). The new piping will
interconnect to the existing VIMS piping that extends outside of the upfit area to create a
continuous connected vent pipe throughout building to the risers in accordance with the VIMP.
Furthermore, the sub-slab annular space below the area of upfit will receive a continuous stone
(#57 stone) layer below the new concrete in accordance with the VIMP. The new layout of the
vent piping with the interconnected piping and gravel layers will provide the same sub-slab vapor
extraction as the original VIMS layout.

Note, the revised as-built includes a correction to the VIMS vent pipe size in the southwestern
portion of the building. The previous VIMP inadvertently indicated that 3” Sch 40 PVC vent pipe
was used in this section, whereas 4” Sch 40 PVC vent pipe was used. Drawing VM-1 in
Attachment 2 includes this change.

The requested modifications listed above are expected to provide equivalent functionality of the
VIMS to the original design and combined with the other provisions and testing requirements in
the DEQ-approved VIMP, are designed to reduce vapor intrusion risks from known Site
contaminants and protect public health of the building occupants related to vapor intrusion.

Mr. Kevin Slaughter March 11, 2021
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Please notify us if these changes are acceptable. If you have any questions or require additional
information, please do not hesitated to contact us at 704-586-0007.

Sincerely, Hart & Hickman, PC

Seal:

Trinh DeSa, PE Andrew Besu Senior Project Engineer Project Geologist
#C1269 – Engineering #245 - Geology
Attachments: Attachment 1 – Raven Industries VaporBlock-20 Plus Specification Sheet
Attachment 2 – VIMP Sheet VM-1, dated 03-11-21

Attachment 1

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.

Attachment 2
UPSTAIR #2COMMERCIAL06PACKAGEMAILLOBBYELEC.COMMERCIAL07COMMERCIAL08COMMERCIAL09COMMERCIAL10COMMERCIAL11COMMERCIAL12COMMERCIAL13COMMERCIAL14COMMERCIAL15ELECTRICALPUMPELEV#2VESTIBULESTORAGEDATAMECH.WOMEN'SMEN'SF-1F-2OP-2OP-1OP-3OP-4OP-5VIMS 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" or 4" SCH 40 THREADED FLUSH JOINT SLOTTED PVCPIPE (0.020" SLOT WIDTH, 1/8" SLOT SPACING) WITHFILTER SOCK SET WITHIN MIN 5" BASE COURSE.INSTALL BASE COURSE APPROX. 1-INCH ABOVE ANDBELOW THE COLLECTION 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"x4"x4" 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)4" 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.COMMERCIAL07COMMERCIAL08COMMERCIAL09COMMERCIAL10COMMERCIAL11COMMERCIAL12COMMERCIAL13COMMERCIAL14COMMERCIAL15ELECTRICALPUMPELEV#1ELEV#2VESTIBULEVESTIBULEDATAMECH.STORAGEDATAMECH.WOMEN'SMEN'SWOMEN'SMEN'SA COLLETT CAPITAL PROPERTY
HD SUPPLY - BROWNFIELDS No. 18015-15-060
1425 WINNIFRED STREET
CHARLOTTE, NORTH CAROLINA
RAILYARD apartments VAPOR 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. CTT-001VAPOR INTRUSIONMITIGATIONSYSTEM PLANMARCH 11, 2021VM-1LEGENDSLOTTED 3" or 4" 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 DECKPROFESSIONALAPPROVALGENERAL LOCATION OFVAPOR LINER AND EXTENTOF VIMSVAPOR 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" OR 4" SCH 40 PVC PIPE WITH 0.020" SLOT WIDTHAND 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)EXISTING 4" SCH 40 PVC PIPE(PIPE IN HATCHED AREA TO BEREPLACED BY PROPOSED PIPE)3" SCH 40 PVCTEE (TYP.)4" 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 DRAWINGSWINONA STREETBLAND STREET
POSITION CLEAN-OUT IN HALLWAY ANDPIPE INTAKE UNDERNEATHCOMMERCIAL SPACE5VM15VM17VM14" SCH 40 PVCSLOTTEDPIPEPROPOSED 4" SCH 40 PVCSLOTTED PIPE (WITHINHATCHED AREA)HATCHED AREA REPRESENTSAPPROXIMATE EXTENT OFCONCRETE REPLACEMENT ANDVAPOR BARRIER REPAIR WITHRAVEN VAPORBLOCK-20 PLUSVIMP MODIFICATIONCOMMERCIALSPACE 1203/11/21S:\AAA-Master Projects\Collett Capital - CTT\CTT-001 Centro Railyard\VIMS Modification Request\Railyard Apartments_VIMP_040419.dwg, 3/12/2021 8:36:36 AM