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<br /> <br />Bear Creek Quarry (M-1977-344) Permit Amendment <br />Holcim US Inc, 3500 Highway 120, Florence, CO 81226 <br />Phone (719) 288-1443 www.holcim.us 68 <br />Analyte Fraction <br />Analyzed Method <br />Method <br />Detection <br />Limit <br />(mg/l) <br />Colorado Water Quality <br />Regulations <br />WQCC <br />Groundwater <br />Regulation 41 <br />WQCC Surface <br />Water <br />Regulation 32 <br />Uranium Dissolved 200.8 0.00005 16.8 6,915 <br />Vanadium Dissolved 200.7 0.0007 100 428 <br />Zinc Dissolved 200.8 0.0025 2,000 - <br />Radiological <br />Gross Alpha <br />Particle Activity Total E900.0 - 15 - <br />Other <br />Oil and grease Total E1664A 3 - - <br />TDS Dissolved SM2540C 5 - - <br />TSS Total SM2450D 2.5 - - <br />Note: "-" indicates the analyte does not have a water quality standard or a method detection limit <br /> <br />2.7.5 Mine Water Source and Uses <br />Water will be needed at the RCQ Mine Site for both dust suppression and sanitary purposes. Holcim has <br />anticipated the need for two groundwater wells to provide the supply for these uses. Well siting will occur <br />in 2024 and applications for well permits will be submitted to the Division of Water Resources once the <br />well locations have been selected. It is anticipated that these wells will be installed in 2025. The <br />replacement supplies for potential depletions in 2025 will continue to be a long-term lease of fully <br />consumable water from Pueblo Board of Water Works (PBWW), which is currently being used to cover <br />depletions at the BCQ, pursuant to the Holcim augmentation plan decreed in Case No. 16CW3102. Terms <br />of the water lease provide for up to 175 acre-feet per year of replacement water to cover depletions from <br />both the Holcim Bear Creek Quarry and the Holcim Wetlands SWSP/16CW3102 Decree on an annual <br />basis. The lease also provides Holcim the option to renew through December 2039. The request for <br />Substitute Water Supply Plan is provided in its entirety in Appendix 4.7. <br />2.7.5.1 Dust Suppression <br />Water needed for dust suppression is dependent on the amount of product mined and the mining <br />operations. Holcim will be utilizing a more efficient mining process that reduces equipment impacts and <br />dust. Dust suppression systems will also be installed on the conveyor system that transports mined <br />product to the cement plant. Dust suppression projections for the BCQ estimated a maximum use of 70 <br />acre-feet per year. However, the RCQ would likely only need 60% of that amount, or approximately 40 <br />acre-feet per year once mining begins. <br />Dust suppression needs during construction are difficult to estimate. Therefore, water pumped from the <br />wells for this use will be measured and reported, but are not expected to exceed 20 acre-feet per year. <br />Dust suppression uses will be considered 100% consumptive. <br />2.7.5.2 Sanitary Needs <br />Typical water use at the BCQ and Cement Plant for domestic needs (bathrooms, kitchen) are on the order <br />of 30 acre-feet per year for 25staff. The RCQ site will have approximately 25 staff, and so these uses are <br />estimated to be only 1 to 2 acre-feet per year (based on typical per capita usage). These uses are <br />considered to be 10% consumptive, with the remaining water returning to the groundwater system through <br />a septic/leach field system.