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Sievers Pit M-77-098 SWSP, Oldcastle SW Group, Inc. <br /> August 7, 2025 <br /> • 3.6 acre-feet of water used for concrete production (covered by case no. 83CW65), <br /> and <br /> • 5.1 acre-feet of water used for asphalt production (covered by case no. 83CW65). <br /> Groundwater for domestic purposes to supply the office and shop on site is withdrawn from <br /> well permit no. 43047-F. This well is augmented by the West Divide Water Conservancy <br /> District ("WDWCD") under its augmentation plan decreed in Case No. 99CW320; therefore, <br /> out-of-priority depletions from the well are not covered by this SWSP. <br /> Groundwater and Surface Water Evaporation <br /> This SWSP anticipates that a maximum of 0.9 acres of water surface will be exposed at the <br /> site in the dewatering trench and ponds as shown on attached Figure 1. During the SWSP <br /> period, the total net evaporation loss annually from the 0.9 acres of exposed groundwater is <br /> estimated to be 2.32 acre-feet per year. <br /> Additionally, there is a 1.9-acre storage pond which does not expose groundwater. This pond <br /> was filled during the 2013 SWSP free river conditions and will have additional water <br /> delivered to it as needed to replace water consumed during the washing process or <br /> evaporated from the surface of the pond. The total gross evaporative loss from the 1.9-acre <br /> storage pond is 7.13 acre-feet per year. <br /> These evaporative losses were calculated using the State Engineer's Guidelines for Gravel <br /> Pits at elevations below 6,500 feet, gross evaporation of 45 inches per year from the NOAA <br /> Technical Report NWS 33 Map 3, and average annual precipitation of 20 inches per year that <br /> was distributed monthly from the Glenwood Springs #053359 station (1900-2006) of which <br /> 70% was credited for the net evaporation calculation associated with the exposed <br /> groundwater. <br /> Total evaporative losses are 9.45 acre-feet per year. <br />