2023-10-03_REVISION - M1977344 (31)

Home Browse Search

Bear Creek Quarry (M-1977-344) Permit Amendment Holcim US Inc, 3500 Highway 120, Florence, CO 81226 Phone (719) 288-1443 www.holcim.us 67 baseline water quality program. Surface water will be sampled at the seep and at SW RC2. SW RC2 is the furthest east location thus it is the most downgradient surface water location. Groundwater level data will be collected using the installed pressure transducers during the interim monitoring program. Red Creek flow data will be collected at the flume using the installed pressure transducer. Transducer data will be downloaded and reviewed quarterly. Based on the Baseline Study analytical results, the following analytical suite is proposed (Table 2.7.1.4-1). After three years of monitoring, Holcim will submit a Technical Revision requesting a reduction of the analytical suite for those constituents with concentrations that are consistently below instrument detection limits. Table 2.7.1.4-1 Analyte Lists Analyte Fraction Analyzed Method Method Detection Limit (mg/l) Colorado Water Quality Regulations WQCC Groundwater Regulation 41 WQCC Surface Water Regulation 32 Inorganic Nitrate Dissolved E300.0 0.006 10 10 Nitrite Dissolved E300.0 0.003 1 0.05 Total Phosphorus Dissolved E365.1 0.008 - 0.11 Sulfate Dissolved E300.0 0.4 250 - Sulfide Dissolved SM4500-S2 0.35 - 0.002 Metals and Metalloids Aluminum Dissolved 200.8 0.02 5,000 - Antimony Dissolved 200.8 0.0001 6 - Arsenic Dissolved 200.8 0.0005 10 340 Barium Dissolved 200.7 0.002 2,000 - Beryllium Dissolved 200.7 0.0013 4 - Boron Dissolved 200.7 0.0074 750 - Cadmium Dissolved 200.8 0.00005 5 2.03 Chromium Dissolved 200.8 0.0005 100 - Chromium III Dissolved SM3500-CR B 0.009 - 231 Chromium VI Dissolved SM3500-CR B 0.009 - 11 Cobalt Dissolved 200.7 0.0023 50 - Copper Dissolved 200.7 0.0023 200 29.3 Iron Dissolved 200.7 0.0031 300 - Lead Dissolved 200.8 0.00013 - 10.9 Manganese Dissolved 200.8 0.0004 50 2,618 Mercury Dissolved 245.1 - 2 - Molybdenum Dissolved 200.8 0.00025 210 - Nickel Dissolved 200.8 0.001 100 168 Selenium Dissolved 200.8 0.0003 20 4.6 Silver Dissolved 200.8 0.000025 50 3.5 Thallium Dissolved 200.8 0.00005 2 -