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{later Oualitv. Ground water samples were collected from 18 cells on a 6iannuaL basis. In • <br />addition, two wells (25-5 and 42P1-l NI) that are required to be sampled did not have <br />enough water to sample. The parameter list used for all cells sampled in 1990~is given on <br />Table 4 (Appendix A). <br />Analyses have been performed by Bookcl iffs Laboratory in Steamboat Springs, Colorado since <br />May 31, 1983. Bookcl iffs Laboratory is EPA certified and performs all analyses by EPA or <br />equivalent methods. Samples are delivered the day of collection to the lab in an iced <br />cooler. The following discussion of the analytical data collected during the reporting <br />period is arranged by strata being monitored and coincides with the format (by aquifer <br />type) in which the analytical data are presented in Appendix D. Sampling techniques for <br />each well are given in the remarks page in the same appendix. Abbreviations used in the <br />remarks are: CV = casing volume, BHV = bore hole volume, EC = electrical conductivity, <br />and FP = field parameters (pH, temperature, and electrical conductivity). <br />iables 5 through 70 (Appendix A) tabulate the percentage of miLliequivalents per liter of <br />major ions and total dissolved solids (TDS) for each well sampled in 1990. Historical <br />data is provided for comparison purposes. It is important to note here that percent . <br />anions for 1981 and 1982 are not tabulated since the program that generates these tables <br />cannot use the format in which this old data exists. The following discussion of water <br />quality will limit itself to a description of major ions and total dissolved solids (TDS) <br />concentrations. A separate section, Comparison of Ground Vater Quality to Nater Use <br />Standards, will list those samples that exceed water use standards. <br />Alluvium. well 32-A, located furthest upstream on Little Grassy Creek, displays e <br />NaMgC a•SOL HC03 type water. TDS values the pest several years have fluctuated, implying <br />that TDS values have stabilized and that changes are due to annual changes in <br />precipitation and subsequent recharge. Progressing down valley, the alluvium picks up <br />spoils water discharge typified by calcium end magnesium replacing sodium as the major <br />cation at WeLI 6-A. 70S and sulfate concentrations increase as one progresses downstream <br />and with time. Well 31-A2 is downstream of the discharge of the Madge Impoundment. tt is <br />also a CaMg-504 type water, TDS values at this well also fluctuate from year to year, <br />implying that those changes are due to annual changes in precipitation. <br />The one well completed in the Grassy Creek alluvium, 33-A, has a [aMg•SOL type water. TDS <br />has remained relatively stable here, and is loner than levels observed upstream in the <br />• I <br />6 <br />