Laserfiche WebLink
<br />• the East, Middle, and West Forks Parachute Creek have been observed to vary from <br />10 to 45 feet below ground surface (ACOE 1985). <br />7.4.3 Springs and Wells <br />There are two springs within 3 miles of the Piceance Site. The nearest is less than <br />1.75 miles south of the Piceance Site at the confluence of Ryan Gulch and Piceance <br />Creek. This spring is hydrologically upgradient of the Piceance Site. The other <br />spring is about 2.5 miles northeast of the Piceance Site, near Square S Ranch. This <br />spring is hydrologically downgradient from the Piceance Site. <br />A single water well, well P73-4 (USGS identification number 395630108170600), exists <br />in the area. This well is located less than 1 mile southeast of the Piceance Site. It <br />was installed in the alluvium of Piceance Creek for use as a sampling/monitoring <br />well (Ficke et al. 1974), but its current status is unknown. <br />According to the Colorado Department of Public Health and Environment and the <br />Colorado Department of Natural Resources State Engineer's Office, the only <br />designated public water supply system within a 10-mile radius of the Piceance Site is <br />located approximately 10 miles west of the Piceance Site in T1S, R99W, Section 33. It <br />is reported to be inactive. There are also three BLM water wells within a 10-mile <br />radius of the Piceance Site: Horse Draw Well (#203073), Ryan Well (#204019), and <br />• Ryan-Shell Well (#200085) (BLM 1997a). These are not designated public water <br />supply wells. <br />Information on wells located within a 2-mile radius of the solution mining well, <br />including well completion data and well plugging diagrams, are incorporated here <br />by reference (Steigers 1997d, EPA 1997a, EPA 1997b, American Soda 1997c). <br />7.4.4 Groundwater Quality <br />Piceance Creek Basin <br />Site-specific water quality data from American Soda's water supply well 20-8, <br />representing the Upper Aquifer, are provided in Table 7-2. These results are from <br />groundwater samples taken in the Uinta Formation at 430 feet and 560 feet (EPA <br />1997a, Steigers 19976). Site-specific water quality data from American Soda's <br />solution mining well 20-3, representing the Upper and Lower Aquifers, are <br />provided in Table 7-3. These results are from groundwater samples taken in the <br />Uinta Formation at 357 feet, the lower part of the Upper Aquifer at 811 feet, and the <br />lower part of the Lower Aquifer immediately above the Dissolution Surface at 1,411 <br />feet (EPA 1997a, Steigers 19976). Additional water quality data taken prior to <br />initiation of the experimental test phase in July 1997 are presented in Table 7-4. <br />These data are from the initial development of monitoring well 20-1 (Lower <br />• Aquifer), monitoring well 20-5 (Upper Aquifer), and monitoring well 21-2 (Alluvial <br />American Soda, L.L.P. 7_22 <br />Commercial Mine Plan <br />August 18, 1998 <br />