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Mr. Bruce Woody
<br />August 7, 2020
<br />Page 4
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<br />Task R00592-230-05
<br />Groundwater Sampling Event 55 (Event 2021 S1)
<br />
<br />DAA proposes to conduct groundwater sampling event 55 at the Orange County Regional Landfill –
<br />North Facility during May, 2021.
<br />
<br />DAA shall coordinate field and laboratory services, obtain groundwater samples, review sampling
<br />documentation received from groundwater sampling personnel, chemically analyze groundwater samples
<br />(ENCO), validate analytical data provided by the contracted laboratory, update historical summary tables,
<br />and prepare a report suitable for direct submission to NC-DEQ.
<br />
<br />During the subject sampling event, the laboratory will:
<br />▪ analyze samples obtained from three monitoring wells associated with the sanitary landfill
<br />(6801- MW6R, 6801-MW7R, 6801-MW17), or the constituents listed in 40 CFR Part 258
<br />Appendix I (15A NCAC 13B .1600), plus those constituents listed in Appendix II that have been
<br />previously and reliably detected at this facility (mercury, naphthalene, sulfide)
<br />▪ analyze samples obtained from nine monitoring wells associated with the sanitary landfill
<br />(6801- MW4, 6801-MW14A, 6801-MW14B, 6801-MW15, 6801-MW16, 6801-MW20, 6801-
<br />MW21S, 6801- MW21D, 6801-MW22), for the constituents listed in 40 CFR Part 258 Appendix II
<br />(15A NCAC 13B.1600)
<br />▪ analyze samples obtained from four “nature and extent” monitoring wells (6801-MW21D2,
<br />6801-MW23, 6801- MW24, 6801-MW301), for the constituents listed in 40 CFR Part 258
<br />Appendix I (15A NCAC 13B .1600), plus those constituents listed in Appendix II that have been
<br />previously and reliably detected at this facility (mercury, naphthalene, sulfide)
<br />▪ analyze samples obtained from four additional wells (6801-MW21S, 6801-MW21D, 6801-
<br />MW23, 6801-MW24) for chloride and carbon dioxide
<br />▪ samples shall be obtained from four monitoring wells associated with the groundwater
<br />remediation injection program (6801-MW21S, 6801-MW21D, 6801-MW23, 6801-MW24), for
<br />the following additional inorganic constituents, in accordance with the approved Underground
<br />Injection Control permit: manganese, potassium
<br />▪ analyze samples obtained from nine monitoring wells (6801-MW04, 6801-MW110S, 6801-
<br />MW110D, 6801-MW21S, 6801-MW21D, 6801-MW21D2, 6801-MW23, 6801-MW24, 6801-
<br />MW301) for hexavalent chromium
<br />▪ analyze 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 />▪ analyze additional samples obtained from well MW-04 for constituents required by regulations
<br />for monitoring of C&D landfills (manganese, iron, chloride, sulfate, total dissolved solids,
<br />alkalinity)
<br />▪ analyze additional samples obtained from well MW-04 for quality control parameters
<br />▪ analyze one trip blank for quality control parameters
<br />DocuSign Envelope ID: C7A3140E-4A17-4E91-92BC-D87506B7FE8B
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