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• excepting Wells BA1 and 9A1. The greatest water level fluctuation at Well BA1 occurred in <br /> the spring and the largest fluctuation at Well 9A1 occurred in the fall. <br />Table 7-3 summarizes the seasonal and water level fluctuation information for all <br />monitoring wells including the alluvial wells. The following conclusions can be made <br />regarding Hubberson Gulch alluvial water levels. Spring recharge in the form of snowmelt <br />runoff and rainfall is the most significant period of recharge for the alluvial aquifer. <br />Both Sumner and winter precipitation appear to be the other more significant forms of <br />recharge to the Hubberson Culch alluvial system. Ground water in the Hubberson Gulch <br />alluvium occurs under both artesian and unconfined conditions. Summer water level <br />fluctuations are the most pronounced (up to 6,2 feet at Well 6A1), most likely because of <br />the greater amount of evapotranspiration during the summer season. For the Watering <br />Trough Gulch alluvial system, spring recharge is the most significant. At Well BA1, <br />summer and fall precipitation appears to provide some recharge to the alluvial aquifer and <br /> winter precipitation provides the least amount of recharge. At Well 9A1, recharge <br /> responses in the summer, fall, and winter are similar (mean water levels are 1.27, 1.29, <br /> and 1.16 feet below ground surface, respectively), but less pronounced than in the spring. <br />• Ground water in the Watering Trough Gulch alluvium occurs under unconfined conditions. <br />Sixteen monitor wells (GW-S2W-21A, -22A, -23A, and USGS Wells Al through A13) have been <br />installed to monitor water levels in the alluvial aquifer system along the Sage Creek side <br />of Seneca II-W. Exhibits 7-1 and 7-2 show the alluvial monitor well locations and the <br />potentiometric surface, respectively. The alluvial wells have been located such that•the <br />Sage Creek alluvial aquifer is monitored above and below mining, as well as in the <br />principal side tributaries. Since wells GW-52W-21A, -22A, and 23A were not installed <br />until the summer of 1990, no data from these wells will be included in the following <br />discussion. <br />Water level data for the USGS alluvial wells was collected from 1980 through August, 1983. <br />No additional water level data has been collected from these monitors to the present. <br />Monthly water level data for the alluvial wells, including hydrog ra phs, are presented in <br />Appendix 7-2. <br />Cro and water in the Sage Creek alluvial aquifer occurs mainly under unconfined conditions. <br />. One well, A10, has exhibited flawing artesian conditions for part of its record. The <br />other 12 alluvial wells have mean water levels below ground surface ranging from 3.34 feet <br />9 <br />