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DocuSign Envelope ID:6CF06457-7118-4304-9934-67C64310797A <br /> Proposal for Rl—Additional Groundwater, Landfill Gas and Soil Characterization <br /> Hillsborough Dump <br /> ID No. NONCD0000483 <br /> Task Orders 483DP-15, 16, 17 and 18 <br /> S&ME Project No.4305-17-061 F <br /> The One-Call Center coordinates utility mark-outs for its member companies. Not all utility <br /> owners/operators are members of the One-Call Center. <br /> The One-Call Center utility mark-outs are for known utility locations that are marked out in easements <br /> and rights-of-way.The mark-outs do not typically go onto private property from the easement or <br /> right-of-way areas. <br /> Private utility locators will enhance the One-Call center mark-outs by continuing to extend and show <br /> the lines marked by the One-Call Center mark out into the project area (if present). Private utility <br /> locators may also use additional equipment(other than just magnetic scans) like ground penetrating <br /> radar to locate underground utilities. Private utility locators will actually go to each proposed drilling <br /> location and mark utilities or"clear"the drilling locations. <br /> S&ME will hand-clear areas for access to the proposed soil boring locations. <br /> S&ME will take photographs of areas or objects that may be disturbed before site services begin. If <br /> needed, photographs of affected areas and objects, restoration efforts,and noteworthy items <br /> encountered during task activities will also be taken. Photographs will be submitted to the Unit to <br /> determine whether photographs will be included in the subsequent report. <br /> Soil samples will be logged and classified to identify soil types according to the Unified Soil Classification <br /> System (USCS). <br /> Soil borings will be closed by filling the bore holes with drill cuttings. If there are voids after placing <br /> cuttings in a boring,the remainder of the bore hole will be filled with bentonite. <br /> GPS coordinates will be collected at all final boring locations. Coordinates will be reported in decimal <br /> degrees to the seventh order using the North American Datum of 1983 (NAD83)and in latitude and <br /> longitude using WGS 84. GPS coordinates will be differentially corrected and provided in an appendix <br /> with brief location descriptions/designations(e.g. SB-S1, etc.). <br /> One duplicate sample per media will be collected per day of sampling. <br /> The soil samples will be sent to a North Carolina-certified laboratory and analyzed for soil asbestos by <br /> Method 1600-600/R-93116 (qualitative/presence or absence), 14 metals by SW-846 method 6020, and <br /> mercury by method 7471. <br /> Subtask A Groundwater Sampling <br /> The volatile organic compounds(VOCs) 1,4-Dioxane and vinyl chloride have previously been detected at <br /> concentrations greater than their North Carolina groundwater protection standards (21-Standards) in groundwater <br /> samples from monitor wells MW-4, MW-6 and MW-7. Inorganic constituents (metals) have also been detected at <br /> concentrations greater than their 2L Standards and concentrations detected in background monitor well MW-15. <br /> At the direction of the PRLF Unit, S&ME will only gauge the depth to water and sample groundwater at monitor <br /> wells MW-4, MW-6, and MW-7 (Figure 1). Collected groundwater samples will be shipped to a North Carolina <br /> certified laboratory for analysis of VOCs by EPA Method 8260 and 8260SIM (1,4-dioxane). Monitor wells MW-4, <br /> MW-6, and MW-7 will be gauged/sampled twice. The second sampling event will be approximately one month <br /> after the first sampling event,as described in Task 483DP-17. <br /> Subtask B Landfill Gas Sampling and Screening <br /> Batch-certified sampling canisters will be used to collect landfill gas samples from gas probe GP-6 for laboratory <br /> analysis of VOCs by Method TO-15, methane by Method 3C, and hydrogen sulfide by EPA Method 15. Two <br /> December 17,2020 3 <br />