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Table 4 Chloride Concentration Statistics in Temporary Site Monitoring WellsColowyo Mine, Meeker, ColoradoDrainage Well NameNo. of Samples(1)Unit Average Minimum MaximumGroundwater Standard(2)Standard TypeSite Background Value(3)% Exceeding Groundwater StandardGood Spring POC-8 6 mg/L 23.5 12.0 30.0 250 Drinking Water - 0%Good Spring POC-9 2 mg/L 20.0 13.0 27.0 250 Drinking Water - 0%Good Spring POC-10 6 mg/L 31.5 30.0 34.0 250 Drinking Water - 0%Good SpringPOC-11 6 mg/L 32.5 23.0 40.0250 Drinking Water - 0%Good SpringPOC-12 6 mg/L 58.0 51.0 63.0 250Drinking Water - 0%Good SpringPOC-13 6 mg/L 33.0 28.0 36.0250 Drinking Water - 0%Good SpringPOC-14 6 mg/L54.3 42.0 99.0 250 Drinking Water - 0%TaylorPOC-3 6 mg/L 87.2 82.0 95.0250 Drinking Water - 0%WilsonPOC-1 6 mg/L 39.0 28.0 45.0250 Drinking Water - 0%Wilson POC-2 6 mg/L 51.0 45.0 63.0 250 Drinking Water - 0%Wilson POC-5 6 mg/L 46.3 26.0 55.0 250 Drinking Water - 0%WilsonPOC-16 6 mg/L 56.5 52.0 60.0250 Drinking Water - 0%Wilson POC-6 6 mg/L 71.7 16.0 92.0 250 Drinking Water - 0%Wilson POC-15 6 mg/L 42.2 36.0 49.0 250 Drinking Water - 0%Notes:mg/L = milligrams per liter(1) The period of record used to calculate statistics was October 2019 through November 2020 for the temporary wells.(2) Groundwater standard obtained from Colorado Department of Public Health and the Environment (CDPHE) Regulation No. 41, The Basic Standards for Ground Water (BSGW), adopted May 11, 2020, and effective June 30, 2020. (3) No background data were available because chloride is not a monitored constituent in Colowyo's Mine Permit.(4) Non-detect sample results were assigned one-half of the reporting limit.Chloride ConcentrationPage 1 of 1