09011_Arrow Laundry_SECU Oakhurst_VIM ver4 20200429

May 11, 2020
Sent Via E-mail
Mr. Aric Geda. P.E. Modulus, PLLC
P.O. Box 935
Oak Ridge, NC, 27310 [e-mail]
Subject: Vapor Intrusion Mitigation System Design Compliance Review
Former Arrow Laundry and Cleaners
Charlotte, Mecklenburg County Brownfields Project No. 09011-05-060
Dear Aric:
The North Carolina Department of Environmental Quality Brownfields Program (DEQ Brownfields) received and reviewed the Vapor Intrusion Mitigation System Design (Revision 4) dated April 29, 2020. Revision 4 includes the proposed drive-through “Outpost” building not included in the prior VIMS Compliance Letter for Revision 2. DEQ Brownfields has found this
VIMS Design to be in compliance with Land Use Restriction 6 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 the differential pressure measurements and/or analytical results of samples collected as outlined in Section 4 of the VIMS Design (for both proposed structures).
In addition, DEQ Brownfields’ reserves the authority to require confirmation of efficacy in the
future.
Mr. Aric Geda, P.E. May 11, 2020
Page 2
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 704-235-2151, or via e-mail at [e-mail].
Sincerely,
J. Kevin SlaughterEnvironmental Specialist II, Brownfields Property Management Unit
Division of Waste Management
ec: Joselyn Harriger PG – DEQ Brownfields
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CCOPYRIGHT STATEMENT 2020:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
A. GEDA
A. GEDA
ORIGINAL SUBMITTAL DATE:
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PIN #
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PROJECT NUMBER:
A. GEDA
M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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VIMS0.01
CONTACTS
PHONE NUMBER: COMPANY: ROLE:
919-800-9093 VIMS Engineer of Record
910-475-1208 Summit Design and Engineering- (Aaron Hutchens)Project Manager
704-235-2195 NCDEQ- (Joselyn Harriger)Brownfields Project Manager
Modulus, PLLC - (Aric Geda)
SECU OAKHURST- MONROE ROAD
VIMS DESIGN
CHARLOTTE, NC
APRIL 29, 2020
THE GENERAL CONTRACTOR FOR THIS PROJECT IS RESPONSIBLE FOR THOROUGHLY
READING THE ENTIRE SET OF THE MOST CURRENT ARCHITECTURAL, STRUCTURAL,
AND MEP PLANS, ALONG WITH THE NCDEQ-APPROVED VIMS DRAWINGS FOR THIS
PROJECT. AFTER DOING SO, THE GENERAL CONTRACTOR IS TO ACKNOWLEDGE IN
WRITING TO THE VIMS ENGINEER OF RECORD, VIA EMAIL ([e-mail]), THAT
HE OR SHE FULLY UNDERSTANDS AND ACCEPTS THE PROPOSED VIMS DESIGN,
AND/OR, PROVIDE AND REQUEST FOR INFORMATION (RFI) FOR ALL QUESTIONS,
COMMENTS, AND/OR DISCREPANCIES BEFORE STARTING ANY CONSTRUCTION FOR
THIS PROJECT.
ACKNOWLEDGEMENT
SITE LOCATION
@ AT
Ø DIAMETER
"INCHES
'FEET
°DEGREES
∠ANGLE
±PLUS OR MINUS
℄CENTER-LINE
ABDN ABANDONED
AC ACRE
ACP ASBESTOS CEMENT PIPE
ACM ASBESTOS CONTAING MATERIAL
AD AREA DRAIN
AGG AGGREGATE
AB AGGREGATE BASE
ASPH ASPHALT
ASTM AMERICAN SOCIETY OF TESTING MATERIALS
BM BEAM
BRG BEARING
BEG BEGINNING
BLK BLOCK
BOTT BOTTOM
BC BEGINNING OF CURVE
BFP BACKFLOW PREVENTER
BLDC BUILDING CORNER
BLDG BUILDING
BMP BEST MANAGEMENT PRACTICES
BOL BOLLARD
BSW BACK OF SIDEWALK
BVC BEGINNING OF VERTICAL CURVE
BW BOTTOM OF WALL
CB CATCH BASIN
C&G CURB AND GUTTER
CG&S/W CURB, GUTTER AND SIDEWALK
CER CIVIL ENGINEER OF RECORD
CI CAST IRON
CIP CAST IRON PIPE
CL CENTERLINE
CLR CLEAR
CLF CHAIN LINK FENCE
CO CLEAN OUT
CMN COMMUNICATION
CONST CONSTRUCTION
COL COLUMN
CONC CONCRETE
CMU CONCRETE MASONRY UNIT
CMP CORRUGATED METAL PIPE
CONT CONTINUOUS
CJ CONTROL JOINT
CU CUBIC
CY CUBIC YARD
D DELTA (CURVE)
DEMO DEMOLITION
DIP DUCTILE IRON PIPE
DI DROP INLET, DUCTILE IRON
DIA DIAMETER
DIM DIMENSION
A
SYM
B
C
D
ABBREVIATIONS
J
E EASTING
EC END OF CURVE
EG EXISTING GRADE
ELEV ELEVATION
ELEC ELECTRIC
EP EDGE OF PAVEMENT
EOR ENGINEER OF RECORD
EVC END OF VERTICAL CURVE
EX EXISTING
FC FACE OF CURB
FH FIRE HYDRANT
FM FORCE MAIN
FW FIRE WATER
FT FOOT OR FEET
FL FLOW LINE, FLANGE
FLM FLUME
FTG FOOTING
FND FOUNDATION
FG FINISH GRADE
FFE FINISHED FLOOR ELEVATION
G GAS
GALV GALVANIZED
GA GAUGE
GV GATE VALVE
GB GRADE BREAK
GRD GROUND
HT HEIGHT
HP HIGH POINT
HORIZ HORIZONTAL
INV INVERT
IN INCH
IRR IRRIGATION
JT JOINT
JB JUNCTION BOX
K KIP (1000 POUNDS)
L LENGTH (CURVE)
LT LEFT
LF LINEAR FEET
LAT LATITUDE
LONG LONGTITUDE
LP LOW POINT, LIGHT POLE
MAX MAXIMUM
MIN MINIMUM
MH MANHOLE
MEP MECHANICAL, ELECTRICAL, & PLUMBING
MON MONUMENT
N NORTHING
NIC NOT IN CONTRACT
NO NUMBER
NTS NOT TO SCALE
OC ON-CENTER
OHE OVERHEAD ELECTRIC
E
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PC POINT OF CURVATURE
PCC POINT OF COMPOUND CURVE
PRC POINT OF REVERSE CURVE
PGL PROFILE GRADE LINE
PI POINT OF INTERSECTION
PT POINT OF TANGENCY
PVC POLYVINYL CHLORIDE
PL PROPERTY LINE
PNT POINT
PP POWER POLE
PED PEDESTRIAN
PUE PUBLIC UTILITY EASEMENT
PSI POUNDS PER SQUARE INCH
R RADIUS
RT RIGHT
RCP REINFORCED CONCRETE PIPE
RP RADIUS POINT
RFI REQUEST FOR INFORMATION
ROW RIGHT OF WAY
S SLOPE, SOUTH
SECT SECTION
SD STORM DRAIN
SS SANITARY SEWER
SHT SHEET
SOG SLAB ON GRADE
SG SUBGRADE
STA STATION
SQ SQUARE
STD STANDARD
STL STEEL
SYM SYMBOL
SW SIDEWALK
SY SQUARE YARD
T TOP
TC TOP OF CURB
TEMP TEMPORARY
TEL TELEPHONE
TD TRENCH DRAIN
THRU THROUGH
TOE TOE OF SLOPE
TOF TOP OF FOUNDATION
TS TOP OF SLAB
TOW TOP OF WALL
TYP TYPICAL
UNO UNLESS NOTED OTHERWISE
V VALVE
VC VERTICAL CURVE
VERT VERTICAL
VIMS VAPOR INTRUSION MEDIATION SYSTEM
W WATER, WEST
WM WATER METER
WV WATER VALVE
W/WITH
WP WORKING POINT
WWF WELDED WIRE FABRIC
YDS YARDS
P
S
W
U
DRAWING INDEX
VIMS0.01 COVER SHEET
VIMS0.02 VIMS DESIGN SUBMITTAL CHECKLIST
VIMS1.01A BRANCH VAPOR COLLECTION SYSTEM LAYOUT
VIMS2.01 SYSTEM DESIGN SPECIFICATIONS
VIMS2.02
VIMS2.03
VIMS1.02 VIMS SYSTEM DETAILS
MATERIAL SHEETS
MATERIAL SHEETS
DRAWING NAMEDRAWING NO.
VIMS2.04 INSTALLATION INSTRUCTIONS
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VIMS1.01B OUTPOST VAPOR COLLECTION SYSTEM LAYOUT
2
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DRAWN BY:
DESIGNED BY:
REVIEWED BY:
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CCOPYRIGHT STATEMENT 2020:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
A. GEDA
A. GEDA
ORIGINAL SUBMITTAL DATE:
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PIN #
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PROJECT NUMBER:
A. GEDA
M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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VIMS0.02
SECTION 3. QA / QC
SITE LOCATION: The property is located northwest of the intersection of Monroe Road and Shade
Valley Road in Charlotte, Mecklenburg County, NC. The location of the site is as shown on the Cover
Sheet. The site consists of an approximate 1.798-acre lot with PIN Number 16105222. Mecklenburg
County GIS indicates that the parcel is owned by State Employees Credit Union (SECU).
SITE HISTORY: The site was developed at least back to 1938 with a filling (gasoline) station. Sometime
between 1938 and 1943, the site was further developed with a dry-cleaners and portions of the
Woonsocket Spinning factory. The site generally remained unchanged until 2006, when the Woonsocket
Spinning factory and the dry-cleaning building were razed from the site. The fueling station was then razed
from the site in 2008. From 2009 to the present date, the site has been vacant.
CONTAMINATION ASSESSMENTS: Several Assessments have been performed on Brownfields
property. These assessments include:
·Report of Preliminary Contamination Assessment prepared by Engineering Consulting Services, Ltd.
(ECS) dated June 14, 2004
·Site Assessment Activities prepared by Hart & Hickman, PC (H&H) dated January 18, 2005
·Brownfield Site Assessment prepared by Hart & Hickman, PC (H&H) dated September 14, 2005
·Phase II Environmental Site Assessment prepared by Modulus, PLLC dated September 29, 2017
·Environmental Assessment prepared by Modulus, PLLC dated February 4, 2019
VOC IMPACTS: These assessment activities have identified limited soil and significant groundwater
impacts associated with petroleum releases from a former gas station, along with solvent impacts
associated with a former dry cleaner, as follows.
·Soil Impacts: Except for a minor detection at one location, no VOCs were detected in the subsurface
soils of the project site above an elevation of 8 feet bgs. Tetrachloroethylene was detected at one
location at a depth of 5.5 to 6 feet below ground surface at a concentration of 0.0095 mg/kg; well
below the PSRG. Minor detections of several VOCs were also observed in the stockpile that exists in
the northwest corner of the site (HA-1 and HA-2). Most of the VOC detections were observed in the
deeper borings, near the groundwater interface. All soil detections observed on the site were below
the most current Industrial / Commercial Health Based PSRGs.
·Groundwater Impacts: All of the groundwater samples obtained at the site detected numerous
VOCs typical to gas stations and dry-cleaning facilities. Several VOCs were detected above the 2L
Standard.
·Groundwater Impacts compared to Non-Residential Groundwater VI Screening Levels: Several
VOCs were detected above the Non-Residential Groundwater VI Screening Levels including
1,2,4-Trimethylbenzene, 1,3,5-Trimethylbenzene, Benzene, Ethylbenzene, Naphthalene,
Tetrachloroethylene (PCE), Trichloroethylene, and Xylenes.
·Soil Vapor Impacts: 1,1,2 Trichloroethane, Benzene, Bromodichloromethane, Xylenes,
Tetrachloroethylene (PCE), and Trichloroethylene were all detected above Non-Residential Soil Gas
Screening Levels (SGSLs).
Several VOCs were detected in the soil vapor and groundwater at the site which exceeded Non-Residential
SGSLs and Non-Residential Groundwater VI Screening Levels, respectively. The risk calculator results
provided by the Brownfields program are shown to the right, which indicate exceedances above the
acceptable risk range of 1E-4 for cumula tive can cer risks and /or hazard index of 1.
PROPOSED CONSTRUCTION: The proposed construction consists of a 1-story credit union branch,
approximately 8,500 square feet in plan size, along with a 1-story "teller outpost" building approximately
850 square feet in plan size. The buildings will be of similar construction on a combination of strip and
column footings with a slab-on grade.
The purpose of this system is to fully protect public health from the impact of sub-slab soil gas vapors.
Vapors that have migrated to the area beneath the building footprints will be evacuated from beneath the
buildings using a system consisting of gravel aggregate, collection pipes, and a vapor barrier. A perforated
piping system laid horizontally in the gravel layer is connected to solid piping system that runs to the
building rooftop. Vapor mitigation exhaust is discharged directly to the atmosphere. A vapor gas barrier
constructed of HDPE will provide a second layer of protection to provide a gas-tight seal to prevent vapors
not collected by the vapor collection system from entering the building.
SECTION 1. INTRODUCTION
PILOT/INFLUENCE TESTING Testing will be performed for passive and active systems prior to
occupancy with the objective to document that all areas below the slab can be effectively
influenced by the current piping network. Vapor Pins will be placed at locations remotely distant
from where each suction point transitions to below the slab in addition to locations near each
suction point and associated horizontal piping. Based on pilot testing results and review by the
Brownfields Program, the number of pressure monitoring points installed for pilot testing may
ultimately reduce the number of permanent pressure monitoring points. The results of the
pilot/influence testing will be submitted to the Brownfields Program for conditional occupancy
consideration as per standard VI provisions.
AIR MONITORING: Sub-slab monitoring will be conducted once the core and shell are
complete. Data will be collected as required by the Brownfields Program under separate cover.
Upon completion of the core and shell of the lower floors, summa canisters will also be placed
inside the building as required by the Brownfields Program. Data from the summa canisters
and sub-slab monitoring will be included in the Evaluation Phase report.
PASSIVE VS. ACTIVE EXTRACTION: The Evaluation Phase Report will be reviewed with the
Brownsfield Program with a recommendation for a passive or active system. The vapor
mitigation system will continue to be operated as a passive system if the data demonstrates
that the mitigation system is providing a building that is safe for public occupancy. The building
will be constructed with electrical outlets on the roof to easily adapt to an active mechanical
vapor system. If elevated levels persist, the system will be modified to operate as an active
mitigation system.
PASSIVE SYSTEM: If the system continues to be operated as a passive system, sub-slab
sampling will need to be conducted on a quarterly basis until provided written approval from DEQ
Brownfields to modify or cease sampling activities. Post-occupancy indoor air sampling requirements
will be determined based on the pre-occupancy soil gas and indoor air sampling event.
ACTIVE MECHANICAL VAPOR SYSTEM: If VOC concentrations below the slab remain high, or
non-background VOCs are measured inside the building envelope, blowers/fans will be added
to the riser pipes. Blowers/fans will create a negative air pressure and extract vapors in the
sub-slab region. The system will provide for a minimum pressure differential of 4 pascals at the
remote ends of the system..An active system will also be fitted with an alarm system to notify
occupants if the system goes down. In the unlikely event that an active system is required,
additional design specifications will be prepared for the active system.
SECTION 4. POST CONSTRUCTION / PRE-
OCCUPANCY SYSTEM TESTING
VAPOR MITIGATION SYSTEM: The vapor mitigation system will be installed as a passive
system. In the case the passive mitigation system does not yield indoor air concentrations below
DEQ Vapor Intrusion Screening Levels and/or DEQ risk calculator values of 1E-4 cumulative cancer risk
and hazard index of 1, the system can be converted to an active system by adding blowers to the
exhaust vents. The system will include the following components:
Gravel Layer: The gravel layer provides a porous layer beneath the vapor barrier to allow for
increased transport of gases from beneath the building. A Vapor-Vent collection system will be
installed within the gravel layer.
·The thickness of the Gravel Layer below the vapor gas barrier will be a minimum of four
inches.
·The composition of gravel will be washed crushed stone.
·The gradations of gravel will conform to #57 or 78M requirements:
Vapor-Vent Gas Collection System: The Vapor-Vent gas collection system is laid within the
gravel layer and connected to the evacuation system to evacuate VOC vapors from beneath the
building footprint.
·The Vapor-Vent will consist of corrugated HDPE perforated piping.
·The Vapor-Vent gas collection system will be installed less than six (6) inches below the vapor
barrier.
·The Vapor-Vent system piping will be connected to a solid four-inch Schedule 40 PVC pipe
that runs to the roof.
·Solid piping should be sloped to allow drainage of water buildup toward the perforated
piping. Manifold piping will not be lower in grade than the perforated piping.
·There must not be any areas isolated from the vapor mitigation system beneath the gas vapor
barrier, as a result of architectural or construction design.
Vapor Gas Barrier: The vapor gas barrier will provide a gas tight seal to prevent VOC vapors not
collected by the extraction system from entering the building.
·The vapor gas barrier will be installed below the building slabs, also extending beyond the
exterior footings and french drain, as indicated on Sheet VIMS 1.02.
·A gas-tight seal must be provided where the vapor gas barrier is attached to all penetrations
using the manufacturer's recommendations.
·Vapor-tight seals are needed at all pipe or conduit penetrations through the barrier. This
includes, but is not limited to, all water lines, sanitary sewer pipes, electrical conduits, and
any other materials that penetrate the barrier. Stego Tape will be used at all pipe or conduit
penetrations through the vapor barrier as described and shown on Sheets VIMS2.01 through
VIMS 2.05.
·The vapor barrier will consist of minimum 20-mil thick polyethylene sheeting, or equivalent.
Polyethylene tape seals will be used at all joints. The soil-vapor barrier can be placed directly
on the aggregate.
Vent Risers: The vent risers run from the sub-slab region to the rooftop, connecting the
Vapor-Vent gas collection system to the rooftop emission stack.
·The Vapor-Vent gas collection system will be connected to solid vent vertical risers.
·The vent risers will be equipped with a sampling port.
·Vent risers will be properly secured to the building (e.g., enclosed within wall cavities or pipe
chases) to protect from damage.
·Vent riser piping will be 4-inch diameter and consist of PVC Schedule 40 pipe or equivalent.
Labeling: Labels are to placed on all accessible piping at intervals no greater than 10 linear feet stating
the purpose of the system along with contact information for questions or repairs. Labels will be placed
as shown on VIMS1.01 and VIMS1.02.
SECTION 2. DESIGN BASIS
INSPECTIONS: Inspections are required for all gravel & piping prior to installing the vapor barrier,
and are required for all sections of the vapor barrier prior to pouring the slab. Inspections will be
conducted by qualified personnel under the supervision of the design P.E. and include field logs
and photographs. Engineer will provide a minimum of 48 business hours advance notification to
the Brownfields Program. prior to inspections. The contractor will inform the design engineer at the
appropriate time to perform the following inspections:
·Confirm gravel layer placement and thickness within the sub-slab depressurization area.
·Confirm the construction of the vapor collection system and associated piping.
·Confirm placement of the vapor barrier at all locations where the barrier is placed.
·Confirm placement of riser pipes prior to wall enclosures.
·Confirm Sealing of all penetrations.
COORDINATION: The contractor is responsible for coordinating details and accuracy of the work;
for confirming and correlating all quantities and dimensions; for selecting fabrication processes;
for techniques of assembly; and for performing work in a safe and secure manner.
SUBMIT FOR REVIEW: Submittals of shop drawings, and product data are required for items
noted in the individual materials section and for contractor designed elements.
ALTERNATES: Alternate products of similar strength, nature and form for specified items may be
submitted with adequate technical documentation to the engineer for review. Alternate materials
that are submitted without adequate technical documentation or that significantly deviate from the
design intent of materials specified may be returned without review. Alternates that require
substantial effort to review will not be reviewed unless authorized by the owner.
SUBMITTAL REVIEW PERIOD: Submittals shall be made in time to provide a minimum of 14
business days for the review by the engineer prior to the onset of fabrication.
GENERAL CONTRACTOR'S PRIOR REVIEW: Prior to submission to the engineer, the
contractor shall review and become familiar with the entire set of the most current Architectural,
Structural, and MEP plans, along with the NCDEQ-approved VIMS submittal for completeness.
Dimensions and quantities are not reviewed by the engineer, and therefore, must be verified by
the general contractor. Contractor shall provide any necessary dimensional details requested by
the detailer and provide the contractor's review signature before forwarding to the
architect/engineer.
MEANS, METHODS AND SAFETY REQUIREMENTS: Construction materials (such as
glues/adhesives, paints, etc.) used during construction (both above and below the slab) should not
contain any level of site contaminants of concern, as required in the Brownfields Agreement. The
contractor is responsible for the means and methods of construction and all job related safety
standards such as OSHA.
DISCREPANCIES: In case of discrepancies between the general notes, specifications plan /
details or reference standards, the engineer shall determine which shall govern. Discrepancies
shall be brought to the attention of the engineer before proceeding with the work. Should any
discrepancy be found in the contract documents, the contractor will be deemed to have included in
the price the most expensive way of completing the work, unless prior to the submission of the
price, the contractor asks for a decision from the architect as to which shall govern. Accordingly,
any conflict in or between the contract documents shall not be a basis for adjustment in the
contract price.
SITE VERIFICATION: The contractor shall verify all dimensions and conditions at the site.
Conflicts between the drawings and the actual site conditions shall be brought to the attention of
the engineer before proceeding with the work.
PRE-CONSTRUCTION MEETING: The contractor is responsible for coordinating a
pre-construction meetings prior to commencing work. Pre-con meetings should be scheduled
approximately two weeks prior to the start of the relevant work. Attendees for the pre-construction
meeting are to include contractor, relevant subcontractors, fabricators, inspectors, and engineer.
Meeting agendas are to include review of the work scope, project schedule relevant to the work,
contact information of responsible parties, inspection points, review of materials and any special
cases or issues, procedures for clarifications if required, testing and acceptance, etc.
PASSIVE SYSTEM: If the system continues to be operated as a passive system, additional soil
gas sampling will need to be conducted on a quarterly basis until provided written approval from DEQ
Brownfields to modify or cease sampling activities. Post-occupancy indoor air sampling requirements
will be determined based on the pre-occupancy soil gas and indoor air sampling event.
ACTIVE MECHANICAL VAPOR SYSTEM: Pressure Testing and soil gas sampling will need to be
conducted on a quarterly basis until provided written approval from DEQ Brownfields to modify or
cease sampling activities. Post-occupancy indoor air sampling requirements will be determined based
on the pre-occupancy soil gas and indoor air sampling event.
SECTION 5. POST-OCCUPANCY TESTING
FUTURE TENANTS OR OCCUPANTS: Future tenants or occupants must be informed of the
VIMS system to prevent exposing and/ or damaging the VIMS without the oversight of a qualified
P.E. If the VIMS is exposed (for installation of new utilities, etc.), the same inspection
requirements and reporting from initial installation is required.
Future tenants and / or occupants must inform the engineer of any proposed site modifications or
renovations that have the potential to disturb the VIMS in any way.
SECTION 6. FUTURE BUILDING USES
Upon completion of post-construction testing, a report will be prepared and submitted to the
Brownfields Program under a N.C. licensed P.E. seal for review and approval. The report will
summarize the installation, QA/QC measures, post-construction/pre-occupancy system
effectiveness testing, and provide an opinion of whether the VIMS was delivered in a condition
consistent with the VIMS design and objectives. In the appendix section, the report will include
as-built drawings, all inspection logs including photographs and field logs, and safety data sheets
for materials used during construction that could contribute to background indoor air
contamination.
SECTION 7. REPORTING
DRAWINGS:
·Site Location Plan: See Sheet VIMS0.01- Cover Sheet
·System Layout: See Sheet VIMS1.01- Gas Collection System Layout
·System Details: See Sheet VIMS1.02- VIMS System Details
DESIGN SPECIFICATIONS:
·Soil Gas Collection System: See Sheet VIMS2.01- System Design Specifications
·Under Slab Vapor Barrier: See Sheet VIMS2.01- System Design Specifications
MATERIAL SHEETS: See Sheet VIMS2.02- Material Sheets
SECTION 8. DESIGN SUBMITTALS
VAPOR INTRUSION MITIGATION (VIMS) DESIGN
C.J.
C.J.
C.J.C.J.C.J.
C.J.
C.
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.
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C.J.
C.J.
C.J
.
C.
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.
C.
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TYP. SLAB ON GRADE
C.J.
C.J.C.J.C.J.C.J.C.J.
C.J.C.J.
C.J.C.J.C.J.
E.O.S.
C.J.C.J.
C.J.
C.J.C.J.
C.
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.
C.
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.
C.
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.
C.
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.
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.
C.
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SLAB BLOCKOUT
FOR CONDUIT
SLAB BLOCKOUT
FOR CONDUIT
SLAB BLOCKOUT
FOR CONDUIT
SLAB BLOCKOUT
FOR CONDUIT
C.J.
C.
J
.
C.J.
C.J.
C.
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.
C.
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.
C.J.
C.
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.
C.J.
C.J.
C.
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.
SLAB BLOCKOUT
FOR CONDUIT SLAB BLOCKOUT
FOR CONDUIT
4" SCH. 40 RISER TO
ROOF LABELED AT
ACCESS PANEL AND
IN ATTIC WITH
"EXHAUST PORT FOR
VIMS- CONTACT
MODULUS, PLLC @
919-800-9093 FOR
INFORMATION"
4" SCH. 40 RISER TO
ROOF LABELED AT
ACCESS PANEL AND
IN ATTIC WITH
"EXHAUST PORT FOR
VIMS- CONTACT
MODULUS, PLLC @
919-800-9093 FOR
INFORMATION"
4" SCH. 40 PVC
4" SCH. 40 PVC
4" CORRUGATED
SLOTTED HDPE
4" CORRUGATED
SLOTTED HDPE
2
VIMS1.02
1
VIMS1.02
VAPOR PIN
VAPOR PIN VAPOR PIN
VAPOR PIN
VAPOR PIN
VAPOR PIN
3
VIMS1.02
4
VIMS1.02
4
VI
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3
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CCOPYRIGHT STATEMENT 2020:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
A. GEDA
A. GEDA
ORIGINAL SUBMITTAL DATE:
RE
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PROJECT NUMBER:
A. GEDA
M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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VIMS1.01A
C.J.
C.J.
ON GRADE
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C.J.
4" SCH. 40 RISER TO
ROOF LABELED AT
ACCESS PANEL AND
IN ATTIC WITH
"EXHAUST PORT FOR
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MODULUS, PLLC @
919-800-9093 FOR
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CCOPYRIGHT STATEMENT 2020:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
A. GEDA
A. GEDA
ORIGINAL SUBMITTAL DATE:
RE
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PROJECT NUMBER:
A. GEDA
M631.1
ORIGINAL SUBMITTAL DATE:
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VIMS1.01B
BULLNOSE SILL BEYOND
ROOF SYSTEM:
STANDING SEAM METAL ROOF WITH AIR GAP AND
UNDERLAYMENT PER MANUFACTURERS
RECOMMENDATION OVER 1/2" GLASS-MAT EXTERIOR
GYPSUM ROOF SHEATHING OVER RIGID BOARD
INSULATION (SEE SPEC'S) OVER METAL DECK AND TRUSS
SYSTEM - SEE STRUCTURAL DRAWINGS
FULL WIDTH MASONRY
STONE (MS2) BEYOND
4 5/8"
12"
STEGO WRAP 20-MIL
VAPOR BARRIER
4" SCH. 40 PVC RISER
24' ABOVE ROOFLINE
4" WIND DRIVEN TURBINE
VENTILATOR
78M OR #57 STONE
4"SCH. 40 PVC
STEGO WRAP TO EXTEND 2" INTO
COLD JOINT, SEALED BELOW WITH
STEGO TACK TAPE AND COVERED
WITH STEGO MASTIC
78M OR #57 STONE
STEGO WRAP 20-MIL
VAPOR BARRIER
4" CORREGATED SLOTTED
HDPE
78M OR #57 STONE
CONCRETE SLAB ON GRADE
WALL / FLOOR SECTION
SCALE: NOT TO SCALE1
FLOOR SECTION
SCALE: NOT TO SCALE2
PIN SECTION
SCALE: NOT TO SCALE3
#57 STONE
FRENCH DRAIN
#2 SLATE CHIPS
STEGO WRAP 20-MIL
VAPOR BARRIER
Install 20A 120V standard
outlet near each riser for
potential future blower.
20 MIL STEGO WRAP
GROUT VOID AFTER
VAULT PLACEMENT
PRE-FAB VAULT BY OTHERS
STEEL SHIM, AS REQ'D
6" SLAB ON GRADE W/ W.W.F.
6X6 W2.9XW2.9 OVER 20 MIL
STEGO WRAP & #57 STONE
THICKENED SLAB PIPING DETAIL
SCALE: NOT TO SCALE4
4" SCH. 40 PVC
4" CORRUGATED
SLOTTED HDPE
#57 STONE
ACCESS PANEL PROVIDED BY GC
4" SCH. 40 RISER TO ROOF LABELED
WITH "EXHAUST PORT FOR VIMS-
CONTACT MODULUS, PLLC @
919-800-9093 FOR INFORMATION"
EXPOSED 4" SCH. 40 PIPING IN ATTIC
TO BE LABELED WITH "EXHAUST
PORT FOR VIMS- CONTACT
MODULUS, PLLC @ 919-800-9093 FOR
INFORMATION"
COLD JOINT TO BE SEALED
WITH STEGO MASTIC
PENETRATIONS SEALED WITH
STEGO TAPE AND / OR
MASTIC AS NECESSARY
SEAL STEGO WRAP TO FOUNDATION
WITH STEGO TACK TAPE
4" CORRUGATED SLOTTED HDPE
4" SCH. 40 RISER TO BE LABELED
ABOVE ROOF LINE WITH "EXHAUST
PORT FOR VIMS- CONTACT
MODULUS, PLLC @ 919-800-9093 FOR
INFORMATION"
5
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CCOPYRIGHT STATEMENT 2020:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
A. GEDA
A. GEDA
ORIGINAL SUBMITTAL DATE:
RE
V
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PROJECT NUMBER:
A. GEDA
M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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CCOPYRIGHT STATEMENT 2020:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
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PROJECT NUMBER:
A. GEDA
M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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VIMS2.01
SOIL GAS COLLECTION SYSTEM
SECTION 02 56 19 – GAS CONTROL
PART 1 – GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1
Specification Sections, apply to this Section.
1.2 SUMMARY
A. This Section includes the following:
1. Substrate preparation.
2. Piping installation.
3. Piping accessories.
B. Related Sections: The following Sections contain requirements that relate to this Section:
1.
2.
3.
1.3
Division 2 Section “Earthwork”, “Pipe Materials”, “Sub-drainage systems”, ”Gas Control System”, “Fluid-Applied
gas barrier”.
Division 3 Section “Cast-in-Place Concrete” for concrete placement, curing, and finishing.
Division 5 Section “Expansion Joint Cover Assemblies”, for expansion-joint covers assemblies and installation.
PERFORMANCE REQUIREMENTS
A. General: Provide specified ADS venting material that collects gas vapors and directs them to discharge or to collection points
as specified on the gas vapor collection system drawings and this sheet
1.4 SUBMITTALS
A. Submit Product Data for each type of gas venting system specified, including manufacturer’s
specifications.
B. Sample – Submit representative samples of the following for approval:
1. Gas venting Piping.
2. Pipingaccessories.
1.5 QUALITY ASSURANCE
A.Installer Qualifications: Engage an experienced Installer who is certified and approved by vapor intrusion barrier.
B. Manufacturer Qualification: Obtain gas venting, vapor intrusion barrier and system components from a single
manufacturer.
C. Pre-installation Conference: A pre-installation conference shall be held prior to installation of the venting system, vapor
intrusion barrier and waterproofing system to assure proper site and installation conditions, to include contractor,
applicator, engineer and inspector .
1.6 DELIVERY, STORAGE, AND HANDLING
A. Deliver materials to project site as specified by manufacturer labeled with manufacturer’s name, product brand name and
type, date of manufacture, shelf life, and directions for handling.
B.Store materials as specified by the manufacturer in a clean, dry, protected location and within the temperature range
required by manufacturer. Protect stored materials from direct sunlight.
C. Remove and replace material that is damaged.
PART 2 – PRODUCTS
2.1 MANUFACTURER
A. Advanced Drainage Systems (ADS)
1. Corex Single Wall Drain Pipe-Perforated
2.2 GAS VENT MATERIALS
A. Corex Single Wall Drain Pipe-Perforated is a sub slab vapor collection system.
2.3 AUXILIARY MATERIALS
A. Caps, tees, transitions
B. Stego Tape.
PART 3 – EXECUTION
3.1 EXAMINATION
A. Examine substrates, areas, and conditions under which gas vent system will be installed, with installer present, for
compliance with requirements. Do not proceed with installation until unsatisfactory conditions have been corrected.
3.2 SUBSTRATE PREPARATION
A. Verify substrate is prepared according to project requirements.
3.3 PREPARATION FOR PIPING
A. Mark the layout of piping per layout design developed by engineer.
3.4 PIPING INSTALLATION
A.
B.
Install piping on substrate material where designated on in accordance with manufacturer’s recommendations.
At areas where piping intersects use reinforcing tape, as approved by the manufacturer, to seal the connection to
prevent sand or gravel from entering the core.
C. Place vent risers per specifying engineer’s project specifications. Connect corrugated piping to pvc with a transition
fitting and seal with Stego tape. Use materials with the specified diameter piping as shown on system drawings.
3.5 PLACEMENT OF OVERLYING AND ADJACENT MATERIALS
A. All overlying and adjacent material shall be placed or installed using approved procedures and guidelines to prevent
damage to the pipe.
B. Equipment shall not be directly driven over and stakes or any other materials may not be driven through the
piping.
02 56 19
UNDER-SLAB VAPOR BARRIER
3$57±*(1(5$/
1.1 SUMMARY
A.
B.
1.2
Products supplied under this section:
1.
Related sections:
1.
2.
REFERENCES
A.
2.
B.
1.3
Vapor barrier and installation accessories for installation under concrete slabs.
Section 03 30 00 Cast-in-Place Concrete
Section 07 26 00 Vapor Retarders
American Society for Testing and Materials (ASTM):
1.ASTM E1745- 11Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil
or Granular Fill Under Concrete Slabs.
ASTM E1643- 11Selection, Design, Installation, and Inspection of Water Vapor Retarders Used in
Contact with Earth or Granular Fill Under Concrete Slabs.
Technical Reference - American Concrete Institute (ACI):
1.
SUBMITTALS
A.
2.
3.
4.
3$57±352'8&76
2.1 MATERIALS
A.
2.
3.
B.
Quality control/assurance:
1.
ACI 302.2R-06 Guide for Concrete Slabs that Receive Moisture-Sensitive Flooring Materials.
Summary of test results per paragraph 9.3 of ASTM E1745.
Manufacturer’s samples and literature.
Manufacturer’s installation instructions for placement, seaming, penetration repair, and perimeter seal
per ASTM E1643.
All mandatory ASTM E1745 testing must be performed on a single production roll per ASTM E1745
Section 8.1.
Vapor barrier shall have all of the following qualities:
1.
Other performance criteria:
a. Strength: ASTM E1745 Class A.
b. Thickness: 20 mils minimum
Provide third party documentation that all testing was performed on a single production roll per ASTM
E1745 Section 8.1
Vapor barrier products:
1.
2.
2.2 ACCESSORIES
A.
B.
Seams :
1.
2.
Basis of Design: Stego Wrap Vapor Barrier (20-mil) by Stego Industries LLC., [phone]
www.stegoindustries.com.
Approved products meeting all performance and submittal requirements.
Maintain permeance of less than 0.01 Perms [grains/(ft2 · hr · inHg)] as tested in accordance with
mandatory conditioning tests per ASTM E1745 Section 7.1 (7.1.1-7.1.5).
Stego Tape by Stego Industries LLC, [phone] www.stegoindustries.com.
Penetrations of Vapor barrier:
1.Stego Mastic by Stego Industries LLC, [phone] www.stegoindustries.com.
Stego Tape by Stego Industries LLC, [phone] www.stegoindustries.com.
C.Perimeter/edge seal:
1.
2.
3.
3$57±(;(&87,21
3.1 PREPARATION
A.
3.2
Ensure that subsoil is approved by Architect or Geotechnical Engineer.
1.Level and compact base material.
INSTALLATION
A.
2.
Install vapor barrier in accordance ASTM E1643.
1.
Stego Crete Claw by Stego Industries LLC, [phone] www.stegoindustries.com.
Stego Term Bar by Stego Industries LLC, [phone] www.stegoindustries.com.
StegoTack Tape (double sided) by Stego Industries LLC, [phone] www.stegoindustries.com.
Unroll vapor barrier with the longest dimension parallel with the direction of the concrete placement
and face laps away from the expected direction of the placement whenever possible.
Extend vapor barrier to the perimeter of the slab. If practicable, terminate it at the top of the slab,
otherwise (a) at a point acceptable to the structural engineer or (b) where obstructed by impediments,
such as dowels, waterstops, or any other site condition requiring early termination of the vapor barrier.
At the point of termination, seal vapor barrier to the foundation wall, grade beam or slab itself.
Seal vapor barrier to the entire slab perimeter using Stego Crete Claw, per manufacturer's instructions.
OR
a. Seal vapor barrier to the entire perimeter wall or footing/grade beam with double
sided StegoTack Tape, or both Stego Term Bar and StegoTack Tape, per
manufacturer’s instructions. Ensure the concrete is clean and dry prior to adhering
tape.
3.
4.
5.
6.
7.
8.
Overlap joints 6 inches and seal with manufacturer’s seam tape.
Apply seam tape/Crete Claw to a clean and dry vapor barrier.
Seal all penetrations (including pipes) per manufacturer’s instructions.
Avoid the use of non-permanent stakes driven through vapor barrier.
If non-permanent stakes are driven through vapor barrier, repair as recommended by vapor barrier
manufacturer. Any permanent stakes utilized for conduit support must be a solid material (not hollow or
pipe), and appropriately sealed.
Repair damaged areas with vapor barrier material of similar (or better) permeance, puncture and tensile.
END OF SECTION
ADS, Inc. Drainage Handbook Specifications ♦ 1-19
ADS SINGLE WALL HIGHWAY PIPE SPECIFICATION
Scope
This specification describes 3- through 24-inch (75 to 600 mm) single wall high density corrugated
polyethylene highway pipe, for use in gravity-flow land drainage applications.
Pipe Requirements
ADS single wall high density corrugated polyethylene highway pipe shall have annular interior and exterior
corrugations.
• 3- through 10-inch (75 to 250 mm) pipe shall meet AASHTO M252, Type C or CP.
• 12- through 24-inch (300 to 600 mm) pipe shall meet AASHTO M294, Type C or CP.
Joint Performance
Joints for 3- to 24- inch (75 – 600 mm) shall be made with split or snap couplings. Standard connection shall
meet the soil-tightness requirements of AASHTO M252 or M294. Gasketed connections shall incorporate a
closed-cell synthetic expanded rubber gasket meeting the requirements of ASTM D1056 Grade 2A2.
Gaskets, when applicable, shall be installed by the pipe manufacturer.
Fittings
Fittings shall conform to AASHTO M252 or AASHTO M294.
Material Properties
Pipe and fittings shall be made of polyethylene compounds that comply with the cell classification 424420C
for 4- through 10-inch (100 to 250mm) diameters, or 435400C for 12- through 24-inch (300 to 600mm)
diameters, as defined and described in ASTM D3350, except that carbon black content should not exceed
4%. The 12- through 24-inch (300 to 600mm) pipe material shall comply with the notched constant ligament-
stress (NCLS) test as specified in Sections 9.5 of AASHTO M294.
Installation
Installation shall be in accordance with ASTM D2321 and ADS recommended installation guidelines with the
exception that minimum cover in trafficked areas for 3- through 24-inch (75 to 600 mm) diameters shall be
one foot (0.3 m). Maximum fill heights depend on embedment material and compaction level; please refer to
Technical Note 2.03. Contact your local ADS representative or visit our website at www.ads-pipe.com for a
copy of the latest installation guidelines.
Pipe Dimensions
Pipe I.D.
in (mm)
Pipe O.D.*
in (mm)
3
(75)
3.6
(91)
4
(100)
4.6
(117)
5
(125)
5.8
(147)
Nominal Diameter, in (mm)
6 8
(150)
7.0
(178)
(200)
9.5
(241)
10
(250)
12.0
(305)
12
(300)
14.5
(368)
15
(375)
18.0
(457)
18
(450)
22.0
(559)
24
(600)
28.0
(711)
*Pipe O.D. values are provided for reference purposes only, values stated for 12 through 24-inch are ±1 inch. Contact a sales representative for exact values
**All diameters available with or without perforations.
© ADS, Inc., April 2019
SPECIAL NOTE:
All glues and other compounds utilized in the system construction should be low VOC and should not
contain site contaminants of concern, especially the chlorinated solvents outlined on VIMS0.02, Section 1
7
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CCOPYRIGHT STATEMENT 2018:
THESE ENGINEERED DRAWINGS AND THEIRCONTENTS ARE THE PROPERTY OF MODULUS,PLLC. AND ARE ISSUED ONLY FOR THE SPECIFICPROJECT AS NAMED AND AS LOCATED PER THENOTED BLOCK & PARCEL. ANY REVISIONS,REPRODUCTIONS OR MODIFICATIONS OF THESEDOCUMENTS WITHOUT THE WRITTEN CONSENTOF MODULUS, PLLC. IS PROHIBITED.
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PROJECT NUMBER:
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M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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CCOPYRIGHT STATEMENT 2018:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
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ORIGINAL SUBMITTAL DATE:
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PROJECT NUMBER:
A. GEDA
M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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CCOPYRIGHT STATEMENT 2018:
THESE ENGINEERED DRAWINGS AND THEIR
CONTENTS ARE THE PROPERTY OF MODULUS,
PLLC. AND ARE ISSUED ONLY FOR THE SPECIFIC
PROJECT AS NAMED AND AS LOCATED PER THE
NOTED BLOCK & PARCEL. ANY REVISIONS,
REPRODUCTIONS OR MODIFICATIONS OF THESE
DOCUMENTS WITHOUT THE WRITTEN CONSENT
OF MODULUS, PLLC. IS PROHIBITED.
PROJECT NUMBER:
AS SHOWN
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PROJECT NUMBER:
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M631.1
ORIGINAL SUBMITTAL DATE:
May 31, 2019
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