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HomeMy WebLinkAbout24054_AJACC Auto_VIMS Mod Request_MP Relocation and Review Letter_20221222 December 22, 2022 Sent via Email Trinh DeSa, PE Hart & Hickman, PC 2923 South Tryon Street, Suite 100 Charlotte, NC 28203 tdesa@harthickman.com Subject: Vapor Intrusion Mitigation Plan – Modification Request AJACC Auto 300 Yeoman Road Charlotte, Mecklenburg County Brownfields Project Number 24054-20-060 Dear Mr. DeSa: The North Carolina Department of Environmental Quality Brownfields Program (DEQ Brownfields) received and reviewed the Vapor Intrusion Mitigation Plan Modification Request (Request) dated November 14, 2022, for the above referenced Brownfields Property. The Request proposes to relocate monitoring point MP-27 to a new location to facilitate accessibility. DEQ Brownfields finds the requested modification to satisfy elements of the Land Use Restrictions of the pending Brownfields Agreement for design of a vapor mitigation system, and as such, this letter constitutes DEQ approval of the modification request. As will be expressed in the Brownfields Agreement for this project, an essential component of public health protection for this design is the professional engineer’s seal of these documents that the proposed design will be effective at mitigating the potential for vapor intrusion at the property and protecting public health. In addition, DEQ Brownfields reserves the authority to require confirmation of efficacy in the future. Be advised that this review from the Brownfields Program does not waive any applicable requirement to obtain any necessary permits, licenses or certifications for the above listed activities nor does it waive any requirement to comply with applicable law for such activities. If you have questions about this correspondence or require additional information, please contact me by phone at (984) 275-5391, or e-mail at peter.doorn@ncdenr.gov. Trinh DeSa, PE December 22, 2022 Page 2 Sincerely, Peter L. Doorn Brownfields Project Manager ec: Josh Glover, Greystar Development East, LLC Chris Hustek, Greystar Development East, LLC Michael Innominato, Greystar Development East, LLC Andrew Besu, Hart & Hickman David Kahn, Hart & Hickman Tracy Wahl, DEQ Kelly Johnson, DEQ Kevin Slaughter, DEQ Via Email November 14, 2022 NCDEQ – Division of Waste Management Brownfields Program 1646 Mail Service Center Raleigh, NC 27699-1646 Attn: Mr. Peter Doorn Re: VIMS Modification Monitoring Point MP-27 Re-Location AJACC Auto Brownfields Site 301 Verbena Street Charlotte, Mecklenburg County, North Carolina Brownfields Project No. 24054-20-060 H&H Project No. GSL-004 Dear Peter: On behalf of Greystar Development East, LLC (Greystar), Hart & Hickman, PC (H&H) has prepared this letter to request that the North Carolina Department of Environmental Quality (DEQ) Brownfields Program to provide notice for modifications to the vapor intrusion mitigation plan (VIMP) prepared for the Action Jackson Aftermarket and Car Care Automotive Service and Repair (AJACC Auto) DEQ Brownfields Program property (Brownfields Project No. 24054-20-060) located at 301 Verbena Street in Charlotte, Mecklenburg County, North Carolina (Site). A multi- family residential apartment complex is under construction at the Site and the development is known as Elan LoSo. On March 29, 2022, the Brownfields Program provided approval for the Vapor Intrusion Mitigation Plan – Revision 1 dated March 15, 2022, related to installation of vapor mitigation controls during construction of the Elan LoSo multi-family residential building. In accordance Mr. Peter Doorn November 14, 2022 Page 2 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Greystar, LLC (GSL)/GSL-004 Elan LoSo/VIMP/VIMP Modifications/VIMP Modification-MP-27/24054-20-060_Elan LoSo_VIMS Mod Request_MP Relocation.docx with the approved VIMP, a passive vapor intrusion mitigation system (VIMS) is being installed during construction of the building. The VIMS modification is described in the following paragraphs. Monitoring Point MP-27 Re-Location The DEQ-approved VIMP includes installation of one two-inch PVC monitoring point (MP-29) that is to be utilized for pressure monitoring and sub-slab vacuum sampling in the southwestern corner of Level 2, Area B. During construction, it was determined that the slab for this portion of Level 2 will be located at a height of approximately 13 feet above exterior grade. As such, in order to provide for a more accessible monitoring point and due to building aesthetics and exterior finishing activities in this area that would prevent installing a vertical pipe on the exterior of the building, this modification proposes to install a new monitoring point, MP-27A, that would be accessible from the hallway of Level 1 in lieu of the original monitoring point. MP-27A is proposed to be enclosed behind a finished sheetrock wall and will be accessible through a lockable access panel installed within the sheetrock. The final height of the monitoring point will be approximately 3 to 5 feet above the finished hallway slab elevation to allow for ease of monitoring. The MP-27A monitoring point will be utilized for post-occupancy sampling and pressure monitoring in accordance with the VIMP. The proposed new monitoring point details are depicted on the attached Sheets VM-1A and VM-B.2 dated November 14, 2022 (Revision 2), with Detail 31/VM-1A depicting the MP-27A installation details. Upon DEQ approval, these revised design sheets will be incorporated into the VIMS design drawing set. During VIMS effectiveness influence testing prior to occupancy of the building, the original monitoring MP-27 is proposed to remain as a temporary point to provide more sub-slab vacuum influence data within this unit. MP-27 will be abandoned after influence testing and prior to finishing activities within the unit. For abandonment, MP-27 will sealed off with polyurethane caulk and concrete, then covered with flooring within the unit and behind exterior finishing materials on the exterior of the building. Mr. Peter Doorn November 14, 2022 Page 2 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Greystar, LLC (GSL)/GSL-004 Elan LoSo/VIMP/VIMP Modifications/VIMP Modification-MP-27/24054-20-060_Elan LoSo_VIMS Mod Request_MP Relocation.docx Engineer’s Certification According to the DWM Vapor Intrusion Guidance: “Risk-based screening is used to identify sites or buildings likely to pose a health concern, to identify buildings that may warrant immediate action, to help focus site-specific investigation activities or to provide support for building mitigation and other risk management options including remediation.” In addition, this VIMP was prepared to satisfy the vapor intrusion mitigation condition in the pending Brownfields Agreement. Per the North Carolina Brownfields Property Reuse Act 130A-310.32, a prospective developer, with the assistance of H&H for this project, is to provide NCDEQ with “information necessary to demonstrate that as a result of the implementation of the brownfields agreement, the brownfields property will be suitable for the uses specified in the agreement while fully protecting public health and the environment instead of being remediated to unrestricted use standards.” It is in the context of these risk-based concepts that H&H’s professional engineer makes the following statement. The Vapor Intrusion Mitigation System (VIMS) detailed herein is designed to mitigate intrusion of subsurface vapors into the subject building from known Brownfields Property contaminants in a manner that is in accordance with the most recent and applicable guidelines including, but not limited to, DWM Vapor Intrusion Guidance, Interstate Technology & Regulatory Council (ITRC) guidance, and American National Standards Institute (ANSI)/American Association of Radon Scientists and Technologists (AARST) standards. The sealing professional engineer below is satisfied that the design is fully protective of public health from known Brownfields Property contaminants. Mr. Peter Doorn November 14, 2022 Page 2 https://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/Greystar, LLC (GSL)/GSL-004 Elan LoSo/VIMP/VIMP Modifications/VIMP Modification-MP-27/24054-20-060_Elan LoSo_VIMS Mod Request_MP Relocation.docx We appreciate your review of the modifications to the VIMS design. If you have any questions or require additional information, please do not hesitate to contact me at 704-586-0007. Sincerely, Trinh DeSa, PE Engineering Manager NC PE (#044470) Hart & Hickman, PC (#C-1269) Attachment: VIMS Sheets VM-1A and VM-B.2 (Revision 2), dated November 14, 2022 cc: Mr. Andrew Besu (H&H) Mr. David Kahn (H&H) FINISHED FLOOR SLAB 2" SCH 40 PVC SET WITHIN GRAVEL LAYER (SEE DETAIL 14 & 15) 2" DRAIN EXPANSION TEST PLUG VIMS MONITORING POINT - TYPICAL DETAIL VIEW NTS 24 VM-1A VAPOR BARRIER PENETRATION SEALED TO PIPE PER MANUFACTURER INSTRUCTIONS 2" SCH 40 PVC 90 DEGREE ELBOW FLOOR CLEANOUT, ADJUSTABLE, 4" DIA ZURN INDUSTRIES MODEL #CO2450-PV4 (OR ENGINEER APPROVED EQUIVALENT) FLUSH WITH FINISHED FLOOR BASE COURSE 4" x 2" FLUSH REDUCER BUSHING OPEN-ENDED PIPE VIMS AT RETAINING WALL ADJACENT TO OCCUPIED SPACE (TYP) NTS 20 VM-1A OPEN AIR SPACE OCCUPIED SPACE SUB-BASE BASE COURSE VAPOR LINER VAPOR LINER SEALED TO OUTSIDE OF CONCRETE AND WATERPROOFING MEMBRANE (WHERE PRESENT) PER MANUFACTURER INSTRUCTIONS (SEE DETAIL 17/VM-1A) WATERPROOFING AND RIGID INSULATION DRAIN WALL (VARIES) CONCRETE FLOOR SLAB 16 NTSVM-1A VIMS AT ELEVATOR PIT (TYP) CONTINUOUS VAPOR LINER SEALED PER MANUFACTURER INSTRUCTIONS SUMP PIT SUB-BASE BASE COURSE VAPOR LINER WATERPROOFING MEMBRANE (IF PRESENT - REFER TO ARCH PLANS) (SEE SPECIFICATION #13) SEE DETAIL 17/VM-1A VAPOR LINER SEALED TO OUTSIDE OF CONCRETE AND WATERPROOFING MEMBRANE (WHERE PRESENT) PER MANUFACTURER INSTRUCTIONS (SEE DETAIL 17/VM-1A) VIMS AT RETAINING WALL ADJACENT TO ENCLOSED SPACE (TYP) NTS 21 VM-1A OCCUPIED SPACE OCCUPIED SPACE SUB-BASE BASE COURSE VAPOR LINER VAPOR LINER SEALED TO OUTSIDE OF CONCRETE AND WATERPROOFING MEMBRANE (WHERE PRESENT) PER MANUFACTURER INSTRUCTIONS (SEE DETAIL 17/VM-1A) WATERPROOFING AND RIGID INSULATION DRAIN WALL (VARIES) CONCRETE FLOOR SLAB BASE COURSE FLOOR CLEANOUT, ADJUSTABLE, 4" DIA ZURN INDUSTRIES MODEL #CO2450-PV4 (OR ENGINEER APPROVED EQUIVALENT) SEE DETAIL 24/VM-1A FLUSH WITH FINISHED FLOOR 25 NTSVM-1A VIMS MONITORING POINT WITH EXTENDED INTAKE PIPE VAPOR LINER 2" SOLID SCH 40 PVC LENGTH VARIES - REFER TO SHEET VM-1 2" SCH 40 PVC 90-DEGREE ELBOW VAPOR LINER PENETRATION SEALED TO PIPE PER MANUFACTURER INSTRUCTIONS WALL (VARIES) OPEN-ENDED PIPE VIMS TURBINE VENTILATOR FAN & EXHAUST (TYP)30 NTS TURBINE VENTILATOR FAN (EMPIRE MODEL TV04SS OR ENGINEER APPROVED EQUIVALENT) OUTDOOR-RATED ELECTRICAL JUNCTION BOX FOR POTENTIAL FUTURE VACUUM FAN (REFER TO SPECIFICATION #4) RISER DUCT PIPE THROUGH ROOF FLASHING ROOFTOP VM-1A HEAVY DUTY NO-HUB RUBBER COUPLING 17 VM-1A SOIL SUB-BASE VAPOR LINER DRAINAGE MAT (IF PRESENT- REFER TO ARCH PLANS) CONCRETE NTS VIMS VAPOR BARRIER IN AREAS WITH WATERPROOFING WATERPROOFING MEMBRANE (REFER TO ARCH PLANS) (SEE SPECIFICATION #13) VAPOR LINER BENEATH THICKENED SLAB VAPOR BARRIER AT STAIR THICKENED SLAB18 NTS STAIR STRINGER SUBBASE BASE COURSE VM-1A CONCRETE FLOOR SLABVAPOR LINER VIMS AT RETAINING WALL ADJACENT TO OPEN AIR SPACE (TYP) NTS 22 VM-1A INTERIOR SPACE OPEN AIR SPACE SUB-BASE CONCRETE FLOOR SLAB BASE COURSE (SEE SPECIFICATION #1) VAPOR LINER WATERPROOFING AND RIGID INSULATION (IF INSTALLED - REFER TO ARCH. DRAWINGS) DRAIN WALL (VARIES) VIMS MONITORING POINT AT WALL CONNECTION (IF WARRANTED) NTS 27 VM-1A BASE COURSE VAPOR LINER SEALED TO PIPE PER MANUFACTURER INSTRUCTIONS WALL (VARIES) POSITION TOP OF 2" PIPE MINIMUM 10" FROM TOP OF ACCESS PANEL DOOR 2" SCH 40 PVC 90 DEGREE ELBOW PIPE SLEEVE VAPOR LINER 12" X 12" WALL ACCESS PANEL PROVIDE PIPE SUPPORT TO PREVENT LOW POINT IN SOLID SECTION OF PIPE. MAINTAIN MINIMUM 1% SLOPE TOWARD OPEN-END OF PIPE. (SEE SPECIFICATION #2) 2" DRAIN EXPANSION TEST PLUG OPEN-ENDED PIPE POSITION AT CENTER OF WALL OR ALLOW FOR AT LEAST 1/2" DISTANCE AROUND ALL SIDES OF PIPE 2" SOLID SCH 40 PVC PIPE EXTERIOR PERMANENT VACUUM MEASURING POINT (TYP)28 NTSVM-1A WALL (VARIES) PROVIDE LOCKABLE WEATHERPROOF ENCLOSURE ON OUTSIDE OF BUILDING WALL (OR SIMILAR). AFFIX LABEL AT BOX WITH "VAPOR MITIGATION SYSTEM". PLACE REMOVABLE PIPE PLUG AT END OF 2" PIPE. VAPOR LINER SEALED TO CONCRETE PER MANUFACTURERS INSTRUCTIONS (TYP) 2" SCH 40 PVC 90 DEGREE ELBOW 2" SOLID SCH 40 PVC PIPE INSTALLER SHALL SECURE PIPE TO PREVENT MOVEMENT OR DAMAGE TO PIPE DURING THE CONCRETE POUR EXTERIOR GRADE (VARIES) BASE COURSE (SEE SPECIFICATION #1) 2" OPEN ENDED PIPE, PLACED AT A MINIMUM OF 5' FROM EXTERIOR TURN-DOWN SLABS VENT PIPE PROTECTION SCREEN PIPE SLEEVE. SEE SPECIFICATION #11. SLEEVE SHALL NOT PENETRATE VAPOR LINER. VAPOR LINER (SEE SPECIFICATION #1) VAPOR LINER SEALED TO PIPE PER MANUFACTURERS INSTRUCTIONS (TYP) VIMS AT SLAB ON GRADE FOLD WITH PIPE CONNECTION (TYP) NTS 23 VM-1A OCCUPIED SPACE OCCUPIED SPACE SUB-BASE BASE COURSE VAPOR LINER VAPOR LINER SEALED TO OUTSIDE OF CONCRETE AND WATERPROOFING MEMBRANE (WHERE PRESENT) PER MANUFACTURER INSTRUCTIONS (SEE DETAIL 17/VM-1A) DRAIN WALL (VARIES) CONCRETE FLOOR SLAB SOLID TO SLOTTED 3" SCH 40 PVC PIPE TRANSITION (SLIP COUPLING OR THREADED JOINT) 3" SCH 40 PVC 90-DEGREE ELBOW VAPOR LINER SEALED TO PIPE PER MANUFACTURER INSTRUCTIONS 3" SCH 40 PVC 45-DEGREE ELBOW PIPE SLEEVE WATERPROOFING AND RIGID INSULATION (IF INSTALLED - REFER TO ARCH. DRAWINGS) VIMS AT RETAINING WALL ADJACENT TO ENCLOSED SPACE (TYP) NTS 19 VM-1A LEVEL 2 SUB-BASE BASE COURSE VAPOR LINER SEALED TO OUTSIDE OF CONCRETE AND WATERPROOFING MEMBRANE (WHERE PRESENT) PER MANUFACTURER INSTRUCTIONS (SEE DETAIL 17/VM-1A) WATERPROOFING AND RIGID INSULATION DRAIN BREEZEWAY CONCRETE TOPPING SLAB ON FORM DECK BASE COURSE FLOOR CLEANOUT, ADJUSTABLE, 4" DIA ZURN INDUSTRIES MODEL #CO2450-PV4 (OR ENGINEER APPROVED EQUIVALENT) SEE DETAIL 24/VM-1A VAPOR LINER PENETRATION SEALED TO PIPE PER MANUFACTURER INSTRUCTIONS 2" SOLID SCH 40 PVC (APPROXIMATE 5 FT LENGTH) 2" SCH 40 PVC 90 DEGREE ELBOW FLUSH WITH FINISHED FLOOR PROVIDE PIPE SUPPORT TO PREVENT LOW POINT IN SOLID SECTION OF PIPE. MAINTAIN MINIMUM 1% SLOPE TOWARD SLOTTED SECTIONS OF PIPE. (SEE SPECIFICATION #2) 26 NTSVM-1A VIMS MONITORING POINT AT THICKENED SLAB WITH EXTENDED INTAKE PIPE PIPE SLEEVE OPEN-ENDED PIPE 29 NTS VAPOR BARRIER PENETRATION SEALED TO PIPE PER MANUFACTURER INSTRUCTIONS 1" SCH 40 PVC 90 DEGREE ELBOW OPEN ENDED PIPE BASE COURSE (SEE SPECIFICATION #1) TEMPORARY MONITORING POINT (TYPICAL) 1" SOLID SCH 40 PVC TEST PLUG (1" PIPE SIZE) SET PIPE FLUSH WITH SLAB OR EXTENDED MORE THAN 6" ABOVE SLAB. SEE SPECIFICATION #7. VM-1A VIMS MONITORING POINT AT BREEZEWAY RETAINING WALL (TYP) NTS 31 VM-1A LEVEL 2 SUB-BASE BASE COURSE VAPOR LINER SEALED TO OUTSIDE OF CONCRETE AND WATERPROOFING MEMBRANE (WHERE PRESENT) PER MANUFACTURER INSTRUCTIONS (SEE DETAIL 17/VM-1A) DRAIN BREEZEWAY 12" X 12" WALL ACCESS PANEL 2" DRAIN EXPANSION TEST PLUG 2" SCH 40 PVC 90-DEGREE ELBOW VAPOR LINER PENETRATION SEALED TO PIPE PER MANUFACTURER INSTRUCTIONS 2" VENT PIPE PROTECTION SCREEN VAPOR MITIGATION PLAN PREPARED BY: 2923 South Tryon Street-Suite 100 Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f) License # C-1269 / #C-245 Geology VAPOR INTRUSION MITIGATION SYSTEM CROSS-SECTION DETAILS #16-31 VM-1A PROFESSIONAL APPROVAL H&H NO. KTG-001 ELAN LOSO301 VERBENA STREETCHARLOTTE, NORTH CAROLINABROWNFIELDS PROJECT NO. 24054-20-060DEVELOPER: GREYSTAR 521 E. MOREHEAD STREET SUITE 400 CHARLOTTE, NORTH CAROLINA REVISIONS REV DATE DESCRIPTION 0 01/05/22 DEQ SUBMISSION 1 02/28/22 RESUBMISSION 2 11/14/22 VIMS MOD REQUEST DATE: 11-14-22 11/14/22 \\harthick.sharepoint.com@SSL\DavWWWRoot\sites\MasterFiles-1\Shared Documents\AAA-Master Projects\KTGY Architects\KTG-001 Elan LoSo VIMP\Figures\VIMP Design_R2.dwg A1.1A1.1A2.2A1.1A1.1A1.1METAL STAIR BY SPECIALTY ENGINEER SIM SEE S2-30.4 FOR LEVEL 2 FRAMING PLAN B4.1 A1.1 ATYP A1.1 A1.1 A2.2 A2.3 A1.2 B4.1 A3.1S1.1A1.1A1.1A1.1ELEV 2 STAIR G2 SIM SIM SEE S2-30.3 FORLEVEL 2 FRAMINGPLANFLOOR JOINTS INUNIT FLOOR SLAB SIM T/CIP WALL= 712.50' SIM ELEV. 5 SIM SIMFDFDDRIVE AISLE RAMP UPAREAWAYAREAWAY ELEC ELEC MECH TEL TEL ELEV LOBBY T T F.H.C. + STANDPIPE F.E.C. F.E.C. F.E.C. F.E.C. F.E.C. F.E.C.F.E.C. F.E.C. ELEV 2 TS TS TS TS MECHF.E.C. F.E.C. F.E.C. E-16 E-15 E-18 E-17 E-19 E-20 MP-22 MP-25 MP-26 MP-24 MP-23 TMP-8 TMP-10 MP-21 TMP-9 MP-27AMP-27 VAPOR MITIGATION PLAN PREPARED BY: 2923 South Tryon Street-Suite 100 Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f) License # C-1269 / #C-245 Geology VAPOR INTRUSION MITIGATION SYSTEM PLAN VIEW LAYOUT LEVEL 2 - AREA B VM-B.2 PROFESSIONAL APPROVAL LEVEL 1 RECYCLE ROOM CONNECTION TO LEVEL 2 LEVEL 1 SLAB-ON-GRADE AREA OPEN AIR PARKING DECK H&H NO. KTG-001 ELAN LOSO301 VERBENA STREETCHARLOTTE, NORTH CAROLINABROWNFIELDS PROJECT NO. 24054-20-060DEVELOPER: GREYSTAR 521 E. MOREHEAD STREET SUITE 400 CHARLOTTE, NORTH CAROLINA LEGEND SLAB GRADE CHANGE THICKENED SLAB COLUMN AND FOOTING OUTDOOR OR OPEN AIR SPACE PROPOSED TOP OF SLAB ELEVATION (TOS). REFER TO STRUCTURAL CONSTRUCTION DRAWINGS FOR FINAL ELEVATIONS. EXTENT OF VAPOR LINER HORIZONTAL COLLECTION PIPING OR SOIL GAS COLLECTOR MAT 3" DIA SCH 40 SOLID PVC PIPE 3" DIA SCH 40 SOLID PVC VERTICAL RISER WITH EXHAUST IDENTIFICATION NUMBER (REFER TO DETAIL NUMBER 30 ON SHEET VM-1A) 2" DIA SOLID PVC PRESSURE MONITORING POINT WITH FLUSH-MOUNTED COVER (POSITION INTAKE MINIMUM 5-FT FROM EXTERIOR FOOTING) 1" DIA SOLID PVC TEMPORARY MONITORING POINT (POSITION INTAKE MINIMUM 5-FT FROM EXTERIOR FOOTING) SUB-GRADE VERTICAL WALL WITH VAPOR LINER (REFER TO DETAIL 19/VM-1A) MP-18 E-17 708.00 LEVEL 1 SLAB-ON-GRADE AREA TERMINATE VAPOR LINER 12" PAST MITIGATED AREA (OR AS SPECIFIED BY DESIGN ENGINEER) (TYP) 13 VM-1 3/30 VM-1/1A 27 VM-1A 22 VM-1A 21 VM-1A 21 VM-1A 23 VM-1A 23 VM-1A 22 VM-1A 19 VM-1A 31 VM-1A 3/30 VM-1/1A 3/30 VM-1/1A 16 VM-1A 5 VM-1 24 VM-1A26 VM-1A 21 VM-1A 27 VM-1A REVISIONS REV DATE DESCRIPTION 0 01/05/22 DEQ SUBMISSION 1 02/28/22 RESUBMISSION 2 11/14/22 VIMS MOD REQUEST DATE: 11-14-22 11/14/22 TMP-8 29 VM-1A 29 VM-1A 28 VM-1A MP-27 MONITORING POINT TO BE TEMPORARY AND ABANDONED AFTER INFLUENCE TEST \\harthick.sharepoint.com@SSL\DavWWWRoot\sites\MasterFiles-1\Shared Documents\AAA-Master Projects\KTGY Architects\KTG-001 Elan LoSo VIMP\Figures\VIMP Design_R2.dwg