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sample. The parameter list used for ell wells sampled in 1993 is given on Table 4. Analyses have been performed by AC2 Laboratory in Steamboat Springs, Colorado since May 31, 1983. AC2 Laboratory performs all anaLys es by EPA or equivalent methods. Samples ere delivered the day of collection to the lab in an iced cooler. The following discussion of the analytical data collected during the reporting period is arranged by strata being monitored and coincides with the format (by aquifer type) in which the analytical data are presented in Appendix D. Sampling techniques for each well are given in the remarks page in the same appendix. Abbreviations used in the remarks are: CV = casing volume, BHV = bore hole volume, EC = electrical conductivity, and FP = field parameters (pH, temperature, and electrical conductivity). Tables 5 through 10 tabulate the percentage of milliequivalents per liter of major ions and total dissolved solids (TDS) for each well sampled in 1993. Historical data is provided for comparison purposes. The following discussion of water quality will be limited to a description of major ions and total dissolved solids (TDS) Concentrations. A separate section, Comparison of Ground Water Quality to Water Use Standards, will discuss any samples that exceed water use standards. Alluvium. Well 32-A, located furthest upstream on Little Grassy Creek, displays a CaMgNa-504HC03 type water (Table 5). The average annual TDS value of 1520 mg/t for this year is within the range of those values previously observed. Progressing down valley, the alluvium picks up spoils water discharge typified by en increase in sulfate and TDS and a corresponding decrease in sodium and potassium at Well b-A. The annual average TDS value of 3307 mg/l for Well 6-A also is within the range previously observed. Well 31-A2 is downstream of the discharge of the Wadge Impoundment. It is a CaMg-S04 type water with the average annual TDS value of 2733 mg/l; again within the historic range. The one well sampled in the Grassy Creek alluvium, 33-A, has a CaMg-SO4HC03 type water. The annual average TDS value of 7447 mg/l is within the historic range. In the Cow Camp Creek (tributary of Fish Creek) alluvium, water quality is measured at two wells. Nell 46-A has a MgCaNa-SO type water. The annual average TDS values for this 4 well peaked in 1987 (3,426 mg/l ), then steadily decreased until 7992 (2,339 mg/l ), but has • increased slightly this year (2,603 mg/l). This is in spite of the fact that 705 values upstream at the 004 pond have increased steadily since 1982 (3,494 mg/l 7993 annual 5