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GROUND WATER MONITORING <br /> Quarterly ground water sampling for water level and water quality were conducted at each of the <br /> designated alluvial and deep wells. As with surface water, samplings were conducted during March, June, <br /> September and December. <br /> Methods <br /> During visits to each station, water level measurements were made using a Soil-Test Indicating Depth <br /> Meter with a conductance bridge. Levels were recorded from the top of the well casing and reported as such. <br /> Water quality samples were collected during the quarterly field trips. Samples were obtained from a hand <br /> baiter,grabbing at least three casings of water prior to sample collection. Parameters of temperature,pH and <br /> conductivity were made in the field. All sampling equipment and handling procedures were consistent with <br /> tthose described in the surface water methods section of this report. <br />' Results <br /> Results of all well water measurements collected during 1985 through 1989 are presented in Appendix 2 <br /> with major parameters summarized in Table 1. Information concerning well depth and completion is also <br /> ' presented in Appendix 2. <br /> The alluvial aquifer of Stollsteimer Creek sampled at stations A-1, W-1, W-5 and W-7 indicate a direct <br /> ' connection with fluctuations of the creek. Water elevations were highest during the high flow period in March <br /> and lowest during the low flow period in fall and winter. Minor fluctuations occurred as a result of <br /> precipitation events. Because of the below normal runoff conditions of the creek during 1989, alluvial water <br /> ' levels were also lower than previous years. In fact, Well W-1 was found to be dry during the September and <br /> December 1989 samplings. Water quality sampling of the alluvial aquifer was conducted at stations A-1,W-1, <br /> W-5 and W-7. In general, chemical parameters were consistent with those sampled in Stollsteimer Creek <br /> (Table 1). The water is considered a mixed ion calcium/magnesium-sulfate/bicarbonate type with a more stable <br /> I ionic condition than the surface waters of the creek. Wells W-1 and W-7 are above mining operations and <br /> are analyzed as control stations while wells A-1 and W-5 are located in Matrinez Meadow in and below the <br /> anticipated area of mining influence. Major parameters of these four wells arc comparable (Table 1) except <br /> I conductivity and TDS at A-1 are somewhat elevated. The metal concentrations of aluminum, iron and <br /> manganese were significantly higher at wells A-1 and W-5 than sampled at W-1 and W-7. Stream <br /> concentrations of those metals at stations S-2 and S-3 have not indicated these significant levels. These <br /> I concentrations may be linked to natural concentrations of the meadow soils. Since the Summer of 1981, the <br /> W-7 well has been utilized as a full-time domestic water supply. This usage appears to have little effect on <br /> water level in the well, however, the usage has decreased concentrations of the metal and other parameters <br /> being sampled. <br /> ` Deep wells completed in the Fruitland Formation were sampled at stations W-6, W-9, W-10, W-17, and <br /> W-18. Wells W-17 and W-18 were eliminated from sampling under the current program. The general water <br /> level fluctuation cycle of these wells is an increase in level from January through June,a decrease from July <br /> through October and a slight increase in November and December (Appendix 2). Station W-6 exhibited the <br /> greatest fluctuations ranging nearly 20 feet (Table 1) and was nearly dry when measured in December, 1989. <br /> Water quality of the deep wells was similar to that of the surface and alluvial waters. The waters are a mixed <br />