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Mr. Bruce Woody
<br />June 9, 2023
<br />Page 3
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<br />Task-02
<br />Groundwater Sampling Event 61 (Event 2024 S1)
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<br />TRC proposes to conduct groundwater sampling event 61 at the Orange County Regional Landfill – North
<br />Facility during May 2024.
<br />
<br />TRC shall coordinate field and laboratory services, obtain groundwater samples, review sampling
<br />documentation received from groundwater sampling personnel, chemically analyze groundwater samples
<br />(Eurofins), validate analytical data provided by the contracted laboratory, update historical summary
<br />tables, and prepare a report suitable for direct submission to NC-DEQ.
<br />
<br />During the subject sampling event, the laboratory will analyze:
<br />▪ samples obtained from three monitoring wells associated with the sanitary landfill (6801-
<br />MW6R, 6801-MW7R, 6801-MW17), or the constituents listed in 40 CFR Part 258 Appendix I
<br />(15A NCAC 13B .1600), plus those constituents listed in Appendix II that have been previously
<br />and reliably detected at this facility (mercury, naphthalene, sulfide)
<br />▪ samples obtained from nine monitoring wells associated with the sanitary landfill (6801-MW4,
<br />6801-MW14A, 6801-MW14B, 6801-MW15, 6801-MW16, 6801-MW20, 6801-MW21S, 6801-
<br />MW21D, 6801-MW22), for the constituents listed in 40 CFR Part 258 Appendix II (15A NCAC
<br />13B.1600)
<br />▪ samples obtained from four “nature and extent” monitoring wells (6801-MW21D2, 6801-
<br />MW23, 6801-MW24, 6801-MW301), for the constituents listed in 40 CFR Part 258 Appendix I
<br />(15A NCAC 13B .1600), plus those constituents listed in Appendix II that have been previously
<br />and reliably detected at this facility (mercury, naphthalene, sulfide)
<br />▪ samples obtained from four wells (6801-MW21S, 6801-MW21D, 6801-MW23, 6801-MW24) for
<br />chloride, carbon dioxide, manganese, potassium
<br />▪ samples obtained from nine monitoring wells (6801-MW04, 6801-MW110S, 6801-MW110D,
<br />6801-MW21S, 6801-MW21D, 6801-MW21D2, 6801-MW23, 6801-MW24, 6801-MW301) for
<br />hexavalent chromium
<br />▪ samples of surface water obtained from two locations along Old Field Creek, for the
<br />constituents listed in 40 CFR Part 258 Appendix II (15A NCAC 13B .1600)
<br />▪ additional samples obtained from well MW-04 for constituents required by regulations for
<br />monitoring of C&D landfills (manganese, iron, chloride, sulfate, total dissolved solids, alkalinity)
<br />▪ all samples (16 wells and two surface water locations) for full list of PFAS compounds (40
<br />analytes) of EPA (draft) method 1633 per NCDEQ requirements
<br />▪ additional samples obtained from well MW-04 for quality control parameters (MS/MSD)
<br />▪ one trip blank for quality control parameters and one duplicate, and one field blank for PFAS.
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<br />DocuSign Envelope ID: 754C78C8-AE53-4935-9892-9E38717EABDC
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