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HomeMy WebLinkAbout24050_Vernon Packaging_Sub-Slab Soil Vapor Sampling Work Plan_20220920 SUB-SLAB SOIL VAPOR SAMPLING WORK PLAN Vernon Packaging 850 N. Trade Street Winston-Salem, Forsyth County, North Carolina NCBP #24050-20-034 September 20, 2022 Terracon Project No. 75217006 Prepared for: DPJ Residential, LLC Charlotte, North Carolina Prepared by: Terracon Consultants, Inc. Greensboro, North Carolina Terracon Consultants, Inc. 7327-G West Friendly Avenue Greensboro, NC 27410 P (336) 854-8135 F (336) 365-7020 terracon.com September 20, 2022 Mr. Peter L. Doorne Brownfields Project Manager Division of Waste Management – Brownfields Program NC Department of Environmental Quality 1646 Mail Service Center Raleigh, NC 27699-1646 P: (984) 275-5391 E: peter.doorne@ncdenr.gov Re: Sub-Slab Soil Vapor Sampling Work Plan – Revision 0 Vernon Packaging 850 N. Trade Street Winston-Salem, Forsyth County, North Carolina NCBP #24050-20-034 Terracon Project No. 75217006 Dear Mr. Doorne: On behalf of DPJ Residential, LLC, the Prospective Developer (PD), Terracon Consultants, Inc. (Terracon) is pleased to submit this Sub-Slab Soil Vapor Sampling Work Plan for the above referenced site. Terracon has prepared this work plan based on the findings of our Brownfields Assessment Report dated April 7, 2021, and Soil Vapor Sampling Report dated June 23, 2021. The PD is seeking your approval of the work plan so that the sub-slab soil vapor sampling activities can be completed as described in subparagraph 13.k of the Brownfields Agreement dated July 14, 2022. Terracon appreciates the opportunity to present this work plan to the North Carolina Brownfields Program (NCBP). Terracon Consultants, Inc. is licensed to practice geology in North Carolina. The certification number of the corporation is F-0869. Should you have any questions or require additional information, please do not hesitate to contact us at (336) 854-8135. Sincerely, Terracon Consultants, Inc. Mark I. Miller, P.G. Edmund Woloszyn Jr., R.E.M. Senior Geologist, NCLG 1715 Department Manager II Environmental Services Cc: Mr. D. Porter Jones, DPJ Residential, LLC TABLE OF CONTENTS ii 1.0 INTRODUCTION ............................................................................................................. 1 1.1 General Site Description ...................................................................................... 1 1.2 On-site and Off-Site Concerns ............................................................................. 1 2.0 SCOPE OF WORK .......................................................................................................... 3 2.1 Health and Safety Plan ........................................................................................ 3 2.2 Clear Utilities ........................................................................................................ 4 2.3 Install Sub-Slab Soil Vapor Sampling Probes ....................................................... 4 3.0 SAMPLING METHODS ................................................................................................... 5 3.1 Soil Vapor Sampling Procedures ......................................................................... 5 4.0 SAMPLE ANALYSES ..................................................................................................... 6 5.0 QUALITY ASSURANCE / QUALITY CONTROL ............................................................ 6 6.0 INVESTIGATION DERIVED WASTE MANAGEMENT ................................................... 7 7.0 BROWNFIELDS INVESTIGATION REPORT .................................................................. 7 Exhibits Exhibit 1 – Topographic Map Exhibit 2 – Site Plan with Sampling Locations Table Table 1 – Proposed Sampling and Analysis Plan Appendix Appendix A – NCBP Minimum Requirements Checklist for Site Assessment Work Plans and Reports Responsive ■ Resourceful ■ Reliable 1 BROWNFIELDS ASSESSMENT WORK PLAN VERNON PACKAGING 850 N. TRADE STREET WINSTON-SALEM, FORSYTH COUNTY, NORTH CAROLINA NCBP #24050-20-034 Terracon Project No. 75217006 September 20, 2022 1.0 INTRODUCTION 1.1 General Site Description The site currently consists of one parcel land (Forsyth County Parcel I.D. No. 6835-19-5678) located at 850 N. Trade Street in Winston Salem, Forsyth County, North Carolina (Exhibit 1). The site previously consisted of two parcels of land that were combined to form the current site. The approximately 3.99-acre parcel is developed with the Artreaux Apartments, which are currently under construction (Exhibit 2). The apartments are located within two on-site buildings located in the southern and northeastern portions of the property. A parking garage is located in the northwestern portion of the property. The larger building located in the southern portion of the site comprises 5 stories with a footprint of approximately 55,500 square feet. The smaller building located in the northeastern portion of the property comprises 2 stories with a footprint of approximately 5,000 square feet. 1.2 On-site Concerns As described in Terracon’s Brownfields Assessment Work Plan dated February 25, 2021, eight soil vapor probes were to be installed at the site and would be sampled conditionally, based on the results of the planned soil and groundwater sampling activities. Terracon’s Brownfields Assessment Report dated April 7, 2021 indicated that soil samples collected at the site contained the following concentrations of volatile organic compounds (VOCs) and/or semi-volatile organic compounds (SVOCs): ◼ The VOC 1,2-dibromoethane was detected in soil sample B-8@7’ at a concentration exceeding the Inactive Hazardous Sites Branch (IHSB) Protection of Groundwater Preliminary Soil Remediation Goal (PSRG) but below the Residential Health-Based PSRG. This detection was J flagged, indicating that the reported concentration was an estimate. ◼ The VOCs chlorodibromomethane and 1,4-dichlorobenzene were also detected in soil sample B-8 @ 7’ at concentrations exceeding the laboratory detection limit but below the respective PSRGs. Sub-Slab Soil Vapor Sampling Work Plan Vernon Packaging ■ Winston-Salem, NC September 20, 2022 ■ Terracon Project No. 75217006 Responsive ■ Resourceful ■ Reliable 2 ◼ The VOCs 1,4 dichlorobenzene and total xylenes were detected in soil sample B-04@3’ at concentrations exceeding the laboratory detection limit but below the respective PSRGs. ◼ Multiple SVOCs were reported in soil sample B-8 @ 7’ at concentrations exceeding the laboratory detection limit but below the respective PSRGs. Groundwater samples collected at the site contained the following concentrations of VOCs and SVOCs: ◼ The VOCs chloroform, trans-1,2-dichloroethene, and methyl tert-butyl ether (MTBE) were all detected in at least one groundwater sample at concentrations exceeding their respective laboratory detection limits but below their respective 15A NCAC 2L Groundwater Quality Standards (2L Standards). ◼ The SVOC naphthalene was detected in groundwater sample MW-1 at a concentration exceeding its laboratory detection limit but below its 2L Standard. In summary, one soil sample contained the VOC 1,2-dibromomethane at an estimated concentration exceeding its Protection of Groundwater PSRG. Other VOCs and SVOCs detected in the soil samples were present at concentrations below their respective Protection of Groundwater PSRGs. VOCs and SVOCs detected in the groundwater samples were present at concentrations below their respective 2L Standards. Therefore, with concurrence from the North Carolina Brownfields Program (NCBP), soil vapor samples were not collected as part of the Brownfields Assessment. Because the planned use of the site includes residential development, and based on the emerging use and interpretation of soil vapor survey data, the NCBP subsequently requested that the soil vapor sampling activities be completed in accordance with Terracon’s work plan. Methane was not detected in the soil vapor samples at concentrations exceeding the laboratory Reporting Detection Limit. The soil vapor samples contained a variety of VOC constituents. With the exception of chloroform, the detected VOC concentrations did not exceed their respective North Carolina Department of Waste Management (NCDWM) Residential Vapor Intrusion Screening Levels (VISLs). Chloroform was detected in four of the eight samples at concentrations ranging from 4.12 to 97.3 micrograms per cubic meter (µg/m3), as compared to the VISL of 4.1 µg/m3. The soil vapor sample analytical results were input into the Risk Calculator, which was set to default values. The Risk Calculator indicated that the carcinogenic and hazard index risk values were not exceeded for site residents, non-residential workers, construction workers or recreators/trespassers. Sub-Slab Soil Vapor Sampling Work Plan Vernon Packaging ■ Winston-Salem, NC September 20, 2022 ■ Terracon Project No. 75217006 Responsive ■ Resourceful ■ Reliable 3 2.0 SCOPE OF WORK It is Terracon’s understanding that the primary concern of the NCBP is to assess potential vapor intrusion risks to on-site residents. In order to assess the residential buildings for vapor intrusion concerns and associated health-based risks, Terracon proposes to install a total of nine permanent sub-slab soil vapor monitoring probes, which were discussed in advance with the NCBP Project Manager. The probes will be sampled following installation, and will be sampled a second time at least six months following the initial sampling activities. A total of seven probes will be installed in the first floor of the large building, and two probes will be installed in the first floor of the smaller building. The probes are located to provide information relative to the magnitude and extent of sub-slab soil vapor concentrations beneath each building. The NCBP Minimum Requirement Checklist for Site Assessment Work Plans and Reports dated February 2022 (Appendix A) and the most recent Inactive Hazardous Sites Branch (IHSB) Program Guidelines for Assessment and Cleanup will be used as a protocol for additional assessment activities. The assessment will generally consist of the following elements: ◼ Revise existing Health and Safety Plan ◼ Clear utilities and pre-stressed reinforcement steel in the concrete ◼ Install sub-slab vapor probes ◼ Collect and analyze initial soil vapor samples ◼ Prepare and submit assessment report ◼ Collect and analyze second set of samples at least 6 months following collection of initial samples ◼ Prepare and submit second assessment report 2.1 Health and Safety Plan Terracon will revise the Health and Safety Plan that was previously prepared for the project. At this time, we anticipate that a U.S. EPA Level D work uniform consisting of a hard hat, safety vest, safety glasses, protective gloves and steel-toed boots will be required by all personnel in the work area. It may become necessary to upgrade this level of protection in the event that petroleum or chemical constituents are present and an increased risk for personal exposure is encountered in soil vapor while sampling activities are being conducted. Terracon understands that the foundation system includes a pre-stressed concrete slab. Terracon field personnel will be using a hand drill to advance 3/8” diameter boreholes through the concrete slab, and approximately 6 inches into the underlying sub-slab materials. Rebar materials within the concrete slab (also referred to as “tendons”) are placed under tension to improve the slab rigidity. The health and safety plan will identify the pre-stressed concrete slab as a health Sub-Slab Soil Vapor Sampling Work Plan Vernon Packaging ■ Winston-Salem, NC September 20, 2022 ■ Terracon Project No. 75217006 Responsive ■ Resourceful ■ Reliable 4 concern, and will note that a geophysical survey will be performed to identify the rebar locations prior to any holes being drilled. 2.2 Clear Utilities Terracon will conduct a geophysical survey to identify the locations of rebar “tendons” within the concrete slab. The hand drill locations will be at least 12” from nearby rebar. Terracon will rely on assistance from the client and/or site contact for identifying the location of private underground utilities at the site. 2.3 Install Sub-Slab Soil Vapor Sampling Probes Terracon proposes to install nine soil vapor sampling probes at the site at the locations shown on Exhibit 2: Probe No. Probe Location SV-1 Hallway closet SV-2 Hallway closet SV-3 Hallway SV-4 Hallway electrical closet SV-5 Hallway closet SV-6 Hallway SV-7 Hallway closet SV-8 Residential unit bathroom SV-9 Residential unit bathroom Please refer to the attached Table 1 for the proposed number of samples per area of concern. The proposed sampling locations may be modified in the field to account for utility clearance, access limitations, and/or site conditions. The client will be notified of any significant modifications to the sampling locations. The vapor probes will be installed in accordance with the following procedures: Sub-Slab Soil Vapor Probes ◼ Advance 3/8-inch diameter hole through the existing slab foundation with a hand drill and approximately 6 inches into the underlying soils/gravel. ◼ Install vapor sampling pin into drilled hole, install cap. Sub-Slab Soil Vapor Sampling Work Plan Vernon Packaging ■ Winston-Salem, NC September 20, 2022 ■ Terracon Project No. 75217006 Responsive ■ Resourceful ■ Reliable 5 3.0 SAMPLING METHODS 3.1 Soil Vapor Sampling Procedures The soil vapor probes will be allowed to equilibrate for a minimum of two hours after installation. A helium tracer gas leak test will be conducted prior to sampling. The tracer gas serves as a quality assurance / quality control (QA/QC) method to verify the integrity of the soil vapor probe seal. Approximately three volumes of the vapor implant annulus and attached Teflon® lined tubing will be purged. Purge samples will be screened for helium to assess for leaks in the well seal and with a PID detector to assess for VOCs. Sample collection will begin if the tracer testing indicates helium concentrations in the vapor implant are less than or equal to 10 percent of the helium concentration in the shroud, indicating a sufficiently sealed vapor implant annulus. Soil vapor samples will be collected using an inline purge/sampling train consisting of a batch-certified 1-liter Summa canister for sample collection (sample canister) connected to a critical orifice flow restrictor (flow controller). The sample will be collected over a 15-minute time interval. Samples will be collected with 1.0-liter Summa® canisters equipped with flow controllers. Investigation and sample collection procedures will be conducted in accordance with local industry standard practices. Shut-In Test At each soil vapor implant, prior to connection of the sampling train to the implant, a shut-in (dead- head) test will be conducted to check for leaks in the above-ground purge/sampling manifold. The sample canister and a sacrificial canister (which will not be submitted for laboratory analysis) will be connected to the sampling train. The sampling train influent will be capped, the sampling canister will remain closed, and the sacrificial canister will be opened to create a negative pressure reading on the sampling train pressure gauge. The sacrificial canister valve will then be closed. If there is an observable loss of vacuum, the fittings will be adjusted until the vacuum in the sample train does not noticeably dissipate. Helium Tracer Test For each soil vapor implant sample, following the shut-in test, the purge/sampling train will be connected to the soil vapor sampling implant and a Helium tracer gas leak test will be conducted. The tracer gas serves as a QA/QC method to verify the integrity of the seal of sampling train to the sample implant. An MGD-2002 (or equivalent) helium detector will be used to verify the presence and concentration of tracer gas. The protocol for using a tracer gas is to enclose the tubing and ground interface within a shroud and enrich the shroud atmosphere to at least 10 percent helium. The purging device (i.e. syringe or peristaltic pump) will be situated inside the shroud and connected to the sampling train by Teflon® lined tubing running through the shroud. A minimum of three volumes of the vapor implant annulus and attached Teflon® lined tubing will be purged. Purged soil gas will be directed to a Sub-Slab Soil Vapor Sampling Work Plan Vernon Packaging ■ Winston-Salem, NC September 20, 2022 ■ Terracon Project No. 75217006 Responsive ■ Resourceful ■ Reliable 6 TedlarTM bag at the end of each purge volume. Purged soil gas in the TedlarTM bag will then be screened for helium to assess for leaks in the sampling implant seal. The shroud helium concentration and the helium concentration in the purged soil vapor will be documented after each volume purged. Sample collection will begin if the tracer testing indicates helium concentrations in the vapor implant sampling train are not detected with the MGD-2002. A photograph of the shroud and sampling set-up at each sample location will be included in the report. Sample Collection After completion of the helium tracer test, the valve of the purge device will be closed, and the sample canister valve will be opened to collect soil vapor for laboratory analysis. The sample will be collected in a laboratory-supplied, batch certified 1.0-liter Summa canister connected to sample tubing using Swagelok® fittings connected to the soil vapor implant. The sample canister will be filled using a dedicated flow controller and set to a sample rate of less than or equal to 200 milliliters per minute. An in-line vacuum gauge will be installed to the sample controller to verify initial vacuum levels within the canister and as an indicator that final equalization has been reached (i.e. sampling is complete). The sample canister valve will be closed when the gauge measures less than 6 inches in Hg vacuum (i.e. sampling is complete). The final vacuum will not be allowed to reach 0 inches Hg vacuum. Sample Point Abandonment The sample points will remain until approval for their removal has been received from the NCBP. The sub-slab sampling points will be removed, if possible, and the resulting hole in the building slab will be patched with neat cement. If a sampling point cannot be easily removed, it will be pounded into the drill hole to the extent practicable and patched with neat cement. 4.0 SAMPLE ANALYSES A total of 10 sub-slab soil vapor samples, including 1 duplicate sample, will be analyzed by Pace Analytical laboratory located in Mount Juliet, Tennessee (NC Laboratory Accreditation No. Env375). The soil vapor samples will be analyzed for VOCs using USEPA Method TO-15. The laboratory Reporting Limits (RLs) and Method Detection Limits (MDLs) will meet applicable screening criteria (to the extent feasible) and will include the reporting of “J-Flags.” The laboratory will provide Level II Quality Assurance / Quality Control data packages for all analyses. 5.0 QUALITY ASSURANCE / QUALITY CONTROL Laboratory samples will be analyzed in conjunction with standard laboratory QA/QC procedures including appropriate blanks, duplicates, continuing calibration standards, surrogate standards, and matrix spiking standards in accordance with approved methodologies to monitor both instrument and analyst performance. The laboratory will include estimated concentrations for Sub-Slab Soil Vapor Sampling Work Plan Vernon Packaging ■ Winston-Salem, NC September 20, 2022 ■ Terracon Project No. 75217006 Responsive ■ Resourceful ■ Reliable 7 compounds that are detected at levels above the laboratory detection but below the laboratory reporting limit (J flags). Laboratory results not meeting reporting limits with be identified within the QA/QC discussion of the report. Blind duplicate samples will be collected as part of this investigation for QA/QC purposes. Specifically, 1 duplicate soil vapor sample will be collected per sampling event. The duplicate sample will be submitted for laboratory analysis of VOCs using USEPA Method TO-15. A level II QA/QC data package will be requested from the analytical laboratory for the soil vapor samples. Terracon will require that laboratory RLs and MDLs be below applicable standards and screening levels, to the extent feasible. Terracon will also request “J-Flag” values to be included in the laboratory analytical reports. 6.0 INVESTIGATION DERIVED WASTE MANAGEMENT The assessment activities are not anticipated to generate significant waste materials. 7.0 SUB-SLAB SOIL VAPOR SAMPLING REPORT Upon completion of the assessment activities and receipt of the laboratory analytical results, a Sub-Slab Soil Vapor Sampling Report will be prepared that will include the following items: ▪ Documentation of field activities; ▪ Site plan showing pertinent site features; ▪ Soil vapor sampling logs; ▪ Analytical laboratory results; ▪ Data evaluation and presentation of findings including comparison of data to applicable regulatory standards; and ▪ Recommendations concerning further assessment, if necessary. The report will be completed in a format suitable for submittal to the NCBP. Work associated with this scope of services will be performed under the direction of a Licensed Geologist registered in the State of North Carolina. The final report will be signed and sealed by a Licensed Geologist registered in the State of North Carolina. EXHIBITS TOPOGRAPHIC MAP Vernon Packaging 850 N. Trade Street Winston-Salem, NC TOPOGRAPHIC MAP IMAGE COURTESY OF THE U.S. GEOLOGICAL SURVEY QUADRANGLES INCLUDE: RURAL HALL, NC (1/1/1994), WALKERTOWN, NC (1/1/1997), WINSTON-SALEM WEST, NC (1/1/1997) and WINSTON-SALEM EAST, NC (1/1/1997). 7327-G West Friendly Avenue Greensboro, NC 27410-6253 75217006 Project Manager: Drawn by: Checked by: Approved by: MIM EW EW 1”=2,000’ Vernon Sept 2022 Project No. Scale: File Name: Date: 1 Exhibit MIM APPROXIMATE SITE BOUNDARY SITE PLAN WITH SAMPLING LOCATIONS Vernon Packaging 850 N. Trade Street Winston-Salem, NC 7327-G West Friendly Avenue Greensboro, NC 27410-6253 DIAGRAM IS FOR GENERAL LOCATION ONLY, AND IS NOT INTENDED FOR CONSTRUCTION PURPOSES 75217006 SITE PLAN PROVIDED BY STIMMELL ASSOCIATES MIM EW EW AS SHOWN Vernon Sept 2022 Scale: 2 Exhibit Project Manager: Drawn by: Checked by: Approved by: Project No. File Name: Date: MIM LEGEND SITE BOUNDARY APPROXIMATE BUILDING PERIMETER PROPOSED SUB-SLAB SOIL VAPOR SAMPLING POINT SV-1 SV-2 SV-3 SV-4 SV-5 SV-6 SV-7 SV-8 SV-9 TABLE SUB-SLAB SOIL VAPOR SAMPLING 850 N. Trade Street ■ Winston-Salem, NC September 20, 2022 ■ Terracon Project No. 75217006 Responsive ■ Resourceful ■ Reliable 1 Table 1 – Sampling and Analytical Program Vernon Packaging 850 N. Trade Street Winston-Salem, NC 75217006 Type and Designation1 Purpose REC/Site Concern Advancement Method Estimated Depth (ft)2 No. of Soil Analytical Samples3 Soil Analytical4 Groundwater Sample? (y/n) Groundwater Sampling Method Groundwater Analytical4 Soil Gas Sample? (y/n) Soil Gas Analytical4 QC Samples5 SV-1 through SV-9 Address sub-slab soil vapor concerns Hand drill 1 0 n/a n n/a n/a y VOCs 2 Notes: 1 Type and Designation: B = Soil Boring; MW = Permanent Monitoring Well; TMW = Temporary Monitoring Well; TSP = Temporary Groundwater Sampling Point; SV = Soil Vapor Probe; SSGP = Sub-slab Soil Gas Probe; IAS = Indoor Air Sample 2 Proposed maximum depth based on current knowledge of subsurface conditions and depth to groundwater in area. Depths may be modified based on the actual depth to groundwater or refusal on bedrock. If boring advancement beyond above depths is necessary, client will be notified to discuss options and associated costs. 3 Number of unsaturated zone soil samples to be submitted for analytical testing. Samples will be assigned based on photoionization detector (PID) readings and/or professional judgement considering the type of chemical, nature and depth of source, and chemical fate and transport characteristics. 4 Analytical Methods: VOCs = volatile organic compounds by EPA 8260 (EPA TO-15 for soil gas) SVOCs = semi-volatile organic compounds by EPA 8270 RCRA Metals = Resource Conservation and Recovery Act Metals by EPA 6010/7470/7471 Hexavalent Chrome by EPA 7196A PCBs = Polychlorinated biphenyls by EPA 8082 PCB congeners by EPA 8270M 5 The NCDEQ requires that one QA/QC duplicate sample be collected and analyzed for VOCs, SVOCs, RCRA Metals and hexavalent chromium (soil samples only) for every five samples collected 6 One blind duplicate sub-slab soil vapor sample will be collected per sampling event. APPENDIX A Minimum Requirement Checklist for Site Assessment Work Plan and Reports Work Plan and Report Checklist Version 2 February 2022 Minimum Requirements Checklist for Site Assessment Work Plans and Reports NCDEQ Brownfields Program – February 2022 Instructional Page All references to Prospective Developers includes follow-on owners who may be conducting work in accordance with the Brownfields Property Management Unit. To increase predictability and most efficiently assess Brownfields Properties and the redevelopment timing requirements of Prospective Developers or follow-on owners, the Brownfields Program has standardized the format for Site Assessments. This format has been generated in the form of a checklist to allow for ease in submission by the prospective developer’s consultant and for the Brownfields Program’s completeness review. This checklist outlines the minimum requirements and submittal format under the Brownfields Program for Assessment Requirements and Reporting. All Assessment Work Plans and Reporting submissions to the Brownfields Program must include this completed checklist in the outlined format. These requirements allow DEQ to reduce review time for the Assessment Work Plan and Report and increase process predictability for prospective developers. This checklist will also provide reliable data for risk-based decisions and further expedite the project timeline. Any divergence from these requirements will lengthen the process of assessing risks on the site, may necessitate reprioritization of a project manager’s queue towards projects that meet these requirements. Therefore, delaying production of the brownfields agreement and/or environmental management plan. Any alterations to the checklist on a site- specific basis must be reviewed and approved by the Program prior to implementation. However, in order to respect the schedule of all projects in house and keep the program’s entire project pipeline moving, we strongly recommend against seeking changes to the checklist. Based on a review of environmental and risk data from our project inventory, please note there are some new points of emphasis that are included herein: 1. For ALL residential reuses; sub-slab vapor assessment (full list EPA TO-15) is required, regardless if existing structures will be removed. If no structures or slabs exist on the Brownfields Property, exterior soil gas assessment is required within all proposed structure footprints. 2. ALL properties require groundwater data (VOCs, SVOCs and RCRA Metals) from a minimum of three sample locations, depth to groundwater and a resulting potentiometric map. 3. Soil shall be assessed based on areas of concern and redevelopment plans and across the depth interval of the cut/grading. Work Plan and Report Checklist Version 2 February 2022 Environmental Site Assessment Work Plan Checklist Reviewed and checked by (Name ): _______________________________________ Title Page The title page should include the following information. Letter style reports are acceptable, as long as this information is somewhere on the first page. Title of Work Plan Brownfields Project Name (not the development name) Brownfields Project Number Date (updated with each revision) Revision Number Firm PE/PG License Number Individual PE/PG seal & signature Contact information for Developer, Consultant, and Project Manager Section 1 – Introduction Provide the site location, address, and acreage. Provide a BRIEF summary of the history of the property and its history in the program. For example: reiterate RECs from a Phase I ESA, indicate if the scope of work was negotiated during a Data Gap Meeting, etc. Briefly list and describe the data gaps the assessment is attempting to fill Indicate if the assessment data is for the use of any other DEQ programs in addition to the Brownfields Program (i.e. the site is a regulated UST, IHSB, etc. property) Section 2 – Scope of Work Provide a general description of proposed scope of work covered in this plan (i.e. 2 new monitoring wells, six groundwater samples, 5 exterior soil gas sampling points and 6 soil borings) Discuss samples to be collected by media and source area/location. Generally, the reasoning for the sample locations selected. Describe depths of samples to be collected (Reference Table 1) or how that decision will be made in the field, if needed. State for what each sample will be analyzed (briefly). Reference Table 1. - For all residential reuses, sub slab vapor is required, if no slabs exist, exterior soil gas is required within all proposed footprints. Section 3 – Sampling Methodology Reference the guidance documents you intend to use. IHSB, EPA SESD, VI Guidance, Well Construction Rules (NCAC 2C). Note deviations or methodology planned that is not covered by such guidance (e.g., multi-increment sampling, passive air samplers, mobile labs, Hapsite, simultaneous indoor/outdoor radon, high-volume subslab vapor testing, PFAS sampling). Describe what will be installed (soil boring, temporary well, permanent well, sub slab vapor, exterior soil gas, etc.). Include construction details. Discuss installation methodology (Hand Auger, DPT, etc.) Discuss sample collection procedures. Include the following, at a minimum: • Equipment to be used • Purging methods and volumes Work Plan and Report Checklist Version 2 February 2022 • Stabilization parameters for groundwater sampling • Field screening methods • Leak check procedures for sub-slab vapor and exterior soil gas samples (Note this is required) • Discuss how and when vacuum readings will be collected (for summa cans) Discuss sample point abandonment Section 4 – Laboratory Analyses Discuss the proposed analyses (include method number, preparation method, if there are concerns with short hold times, etc). Discuss any proposed limitations on the contaminants of concern, if any, and the reason for such limitation (sufficient previous data, indoor air interferences, etc). Discuss laboratory certifications. Please note, NC does not certify labs for air samples. Please specify what certification the proposed air lab holds. Indicate that the Reporting Limits/Method Detection Limits will meet applicable screening criteria (to the extent feasible). Include Reporting of J-Flags to meet criteria. Indicate what Level QA/QC will be reported by the laboratory. Level II QA/QC is typically acceptable. Section 5 – QA/QC Specify the duplicate sample frequency. Minimum requirement: 1 duplicate per 20 samples, per media, per method. Discuss Trip Blank. 1 Trip Blank per cooler/shipment of groundwater VOC analyses is required. Discuss how the lab will have sufficient sample volume for MS/MSD analyses. Discuss chain of custody and shipping. Section 6 – Investigation Derived Waste (IDW) Management Discuss what IDW will be generated and how it is proposed to be managed. Management recommendations should be in accordance with 15A NCAC 02T.1503 and 15A NCAC 02H. 0106. Generally, if the Brownfields Property has not previously been assessed, then all IDW must be containerized and characterized prior to management. Previous assessment data that indicate no Hazardous Waste (listed or characteristic) is likely to be encountered in the area of proposed assessment will be required before thin spreading of IDW on-site is permitted. Section 7 – Reporting This section should discuss the components of the assessment report which will be prepared as a result of the above sample collection. At a minimum, the report shall include: Reporting/summary of site work conducted for all sections outlined above in this checklist; Summary of findings and possible recommendations; All applicable tables and figures outlined below with the addition of: Tables for tabulated analytical data per media sampled and analyzed, compared against applicable screening levels, sample depths and depth to groundwater; Figure depicting actual sample locations collected, with each media depicted in the legend, graphic scale and north arrow; and Groundwater potentiometric map, with graphic scale and north arrow. - Boring logs for all soil borings, newly constructed monitoring wells, and exterior soil gas locations - Well construction and abandonment records, if applicable Work Plan and Report Checklist Version 2 February 2022 Firm PE/PG License Number Individual PE/PG seal & signature Work Plan and Report Checklist Version 2 February 2022 Attachments Table 1 – Proposed Sample Locations and Analyses on a Summary Table that includes: Sample ID Sample Objective Proposed Depth(s) Analytical Method(s) QA/QC Samples Background Samples Figure 1 – Site Location Map Site location on a topographic map base Graphic scale and north arrow Figure 2 – Site Map should include the following Buildings Historical sample locations RECs or other areas of concern Proposed sample locations Sample identification labels Background samples QA/QC samples Graphic scale and north arrow High quality aerial suggested as the base map Figure 3 – Site Potentiometric Map - Buildings -Groundwater sample identification labels -Graphic scale and north arrow Figure 4 – Site Plume Maps (groundwater, soil vapor, etc.) Figure 5 – Proposed Development (if available) Overlay of historical and proposed sample locations Graphic scale and north arrow Appendix – Summary of Historical Analytical Data (if needed) – to include tables and figures only.