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SUNDAY MINE COMPLEX-HYDROGEOLOGIC REPORT <br /> others, 2003). A number of wells are listed in the DWR database in the limited alluvium of the <br /> Dolores River over 4 miles southwest of the SMC. Most of these wells are monitoring wells <br /> constructed by the U.S. Department of Energy. A few wells were constructed by Union Carbide <br /> and UMETCO. It is not known if any of the existing wells are currently used as a domestic water <br /> source. <br /> Hydraulic properties of alluvial aquifers are often favorable for groundwater development; <br /> hydraulic conductivity may range from less than 1 foot/day to over 10,000 ft/day depending on <br /> aquifer materials (Freeze and Cherry, 1979). As alluvial aquifers are usually hydraulically <br /> connected to associated streams, the aquifers receive most of their recharge from adjacent <br /> streams and other surface water that may ebb and flow with seasonal runoff events. Some <br /> recharge will occur locally from bedrock aquifers. Likewise, alluvial aquifers discharge to <br /> associated streams, and by evapotranspiration, local pumping, and subflow to underlying <br /> bedrock. <br /> Water quality of alluvial aquifers can vary dramatically depending on geologic source rock and <br /> other influences. In general, total dissolved solids (TDS)will range from 200 milligrams per liter <br /> (mg/L)to 1,500 mg/L. <br /> D Aquifer <br /> The D aquifer consists of the Dakota Sandstone and Burro Canyon Formation. The D aquifer is <br /> confined above by the very low permeability of the Mancos Shale, where present, and below by <br /> the Brushy Basin Member of the Morrison Formation. Regionally, the D aquifer is commonly <br /> used for domestic water supply where shallow depths allow. Weir (1983) reported the presence <br /> of artesian wells in the D aquifer in Disappointment Valley. <br /> A search of wells for this report showed one D aquifer well under ownership of the BLM in <br /> Disappointment Valley. The "Hotchkiss Well" (Permit No. 150887) was drilled in 1950 to a depth <br /> of 164 ft; the well encountered water at 133 ft and the static water level was 60 ft after <br /> completion (USDI, 2020). A field inspection was conducted to locate and measure water levels <br /> in the Hotchkiss Well and other nearby wells that are shown on the DWR map viewer; no wells <br /> were located. <br /> The D aquifer consists of mostly sandstone, conglomerate and some shale and siltstone. Its <br /> thickness ranges from 150 to approximately 400 ft (Avery, 1986). Freethey and Cordy (1991) <br /> state that the D aquifer is approximately 300 ft thick in the area of Disappointment Valley with a <br /> Western Water& Land, Inc. 16 <br />