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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 99 <br />Substitute Water Supply Plan is provided in its entirety in Appendix 4.7. An approval from Division of <br />Water Resources (DWR) will be obtained prior to exposing groundwater. <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. <br />