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- Trout Creek Sandstone. Well WTC201 is used as the rater supply well for the mine <br />faceli ties. It displays a relatively level 7T1S trend. • <br />Comparison of Ground Water quality to Wa tet Use Standards. SCC has compiled a list of <br />ground water standards for agricultural uses (Table 51. This list is composed mostly of <br />Colorado Department of Health (COON) ground water standards as of March 1999, although <br />other agency standards have been used if the CDOH has no agricul [oral standard for a <br />particular parameter. Table 5 has footno tea to indicate Che source of each rater quality <br />standard. <br />' Table 6 provides a eompazison of ground wager quality to agricultural atandazds. This <br />Paradox database generated table does not include the units of concentration lmq/1 or <br />ug/1) for each parameter. The units used fo.[ each parameter aze the same as those listed <br />on the standards table (Table 51 and are ales the same ae those used in the rater quality <br />reports. The frequency column on Table 6 indicates the number of exceedencea out of the <br />total number of samples li.e., 1/2 indicates one exceadance out of two sampleel. Helaw is <br />a summary of standards that were exceeded. Given in pazenthaeis is the source and use of <br />each standazd. <br /> • <br />Parameter Number of Wells <br />boron (COON, irrigation) 1 <br />chloride (California, irrigation) 2 <br />pH (COON, irrigation) 1 <br />iron (COON, irrigation) 5 <br />manganese (COON, irrigation) 11 <br />selenium (COON, irrigation) 1 <br />dissolved solids fUSEPA, irrigation) 8 <br />dissolved solids (Wyoming, livestock) 3 <br />sulfate (California, irrigation) 12 <br />In addition, a total of eight eaa~lee had cadmium values that rexe less than an elevated <br />detection limit 120 uq/1 va. a normal detection limit of 2 ug/1) rhich ras higher than the <br />CDOH standard of 10 uq/1. Literiee, a total of nine samples had lead values that ware <br />lean than an elevated detection limit (200 ug/1 va. a normal detection limit of 20 uq/1) <br />rhieh rae higher than the CDOtl standard of 100 ug/1. The cause of th¢ee elevated <br />detection limi to rae a decision by th¢ laboratory to dilut¢ the samples prioz to a~ulyaae • <br />8 <br />