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<br /> <br />Portland Limestone Quarries (M-1977-344) Permit Amendment-02 <br />Holcim US Inc, 3500 Highway 120, Florence, CO 81226 Revised pursuant to preliminary adequacy review November 20, 2023 <br />Phone (719) 288-1443 www.holcim.us 97 <br /> <br />Table 2.7.4.1-2 Groundwater Analyte Lists <br />Groundwater Samples <br />Analyte Fraction Method <br />Method Detection <br />Limit <br />(mg/l) <br />WQCC Groundwater <br />Regulation 41 <br />(g/L) <br />Inorganic <br />Nitrate Dissolved E300.0 0.006 10 <br />Nitrite Dissolved E300.0 0.003 1 <br />Phosphorus Dissolved E365.1 0.008 - <br />Sulfate Dissolved E300.0 0.4 250 <br />Sulfide Dissolved SM4500-S2 0.35 - <br />Metals and Metalloids <br />Aluminum Dissolved 200.8 0.02 5,000 <br />Antimony Dissolved 200.8 0.0001 6 <br />Arsenic Dissolved 200.8 0.0005 10 <br />Barium Dissolved 200.7 0.002 2,000 <br />Beryllium Dissolved 200.7 0.0013 4 <br />Boron Dissolved 200.7 0.0074 750 <br />Cadmium Dissolved 200.8 0.00005 5 <br />Chromium Dissolved 200.8 0.0005 100 <br />Chromium +3 Dissolved SM3500-CR B 0.009 - <br />Chromium +6 Dissolved SM3500-CR B 0.009 - <br />Cobalt Dissolved 200.7 0.0023 50 <br />Copper Dissolved 200.7 0.0023 200 <br />Iron Dissolved 200.7 0.0031 300 <br />Lead Dissolved 200.8 0.00013 - <br />Manganese Dissolved 200.8 0.0004 50 <br />Mercury Dissolved 245.1 2 <br />Molybdenum Dissolved 200.8 0.00025 210 <br />Nickel Dissolved 200.8 0.001 100 <br />Selenium Dissolved 200.8 0.0003 20 <br />Silver Dissolved 200.8 0.000025 50 <br />Thallium Dissolved 200.8 0.00005 2 <br />Uranium Dissolved 200.8 0.00005 16.8 <br />Vanadium Dissolved 200.7 0.0007 100 <br />Zinc Dissolved 200.8 0.0025 2,000 <br />Radiological <br />Gross Alpha Particle Activity Total E900.0 - 15 <br />Other <br />Oil and grease Total E1664A 3 - <br />TDS Total SM2540C 5 - <br />TSS Total SM2450D 2.5 -