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Pater guaLity. Ground water samples were Collected from 19 wells on a biannual basis. In <br />• addition, one well (42P1-LVI) that is required to be sampled did not have enough water to <br />sample. The parameter list used for all wells sampled in 1994 is given on Table 4- <br />Analyses have been performed by AC2 Laboratory in Steamboat Springs, Colorado since May <br />31, 1983. AC2 Laboratory performs all analyses by EPA or equivalent methods. Samples are <br />delivered the day of collection to the lab in an iced cooler. The following discussion of <br />the analytical date eoLlected during the reporting period is arranged by strata being <br />monitored and coincides with the format (by aquifer type) in which the analytical data are <br />presented in Appendix D. Sampling techniques far each well are given in the remarks page <br />in the same appendix. Abbreviations used in the remarks are: CV = casing volume, BHV = <br />bore hole volume, EC = electrical conductivity, end FP field parameters (px, <br />temperature, and electrical conductivity). <br />Tables 5 through 10 tabulate the percentage of milliequivalents per Liter of major ions <br />end total dissolved solids (TDS) for each well sampled in 1994. xistoricel date is <br />provided for comparison purposes. The following discussion of water quality will be <br />limited to a description of major ions and total dissolved solids (TDS) concentrations. A <br />• separate section, Comparison of Ground Voter guality to Voter Use Standards, will discuss <br />any samples that exceed water use standards. <br />Alluvium. Yell 32-A, located furthest upstream on Little Grassy Creek, displays a <br />NaCaMg-504HC03 type water (Table 5). The annual average TDS value of 1738 mg/L for this <br />year is within the range of those values previously observed. Progressing down valley, <br />the alluvium picks up spoils water discharge typified by an increase in sulfate and TDS <br />end a corresponding decrease in sodium and potassium at 4ell 6-A. The annual average TDS <br />value of 3586 mg/l for Vell 6-A is increasing over time. VeLI 31-A2 is downstream of the <br />discharge of the Vadge Impoundment. It is a CaM 9-504 type water with the annual average <br />TDS value of 4019 mg/l, which is increasing over time. <br />The one well sampled in the Grassy Creek alluvium, 33-A, has a CaMg-504 type water. The <br />annual average TDS value of 1477 mg/l is within the historic range. <br />In the Cow Camp Creek (tributary of Fish Creek) alluvium, water quality is measured at two <br />wells. Yell 46-A has a MgCaNa-S04 type water. The annual average TDS values for this <br />• well peaked in 1987 (3426 mg/l), then steadily decreased until 1992 (2339 mg/l), but <br />5 <br />