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Colorado Department of Health (CDOH) surface water standards as of August 1997, although <br />other agency standazds have been used if the CDOH has no agricultural standard for a <br />particular parameter. Table 9 has footnotes to indicate the source of each water quality <br />standard. <br />Table 30 provides a comparison of surface water quality to agricultural standards. This <br />Pazadox database generated table does not include the unite of concentration (mg/1 ox <br />ug/1) for each parameter. The unite used for each parameter aze the same as those listed <br />on the standards table (Table 9) and are also the same as those used in the water quality <br />reports. The frequency column on Table 10 indicates the number of exceedences out of the <br />total number of samples (i.e., 1/2 indicates one exceedence out of two samples). Below is <br />a summary of standards that were exceeded. Given in parenthesis ie the source and use of <br />each standard. Although the CDOH does not indicate between livestock and irrigation uses <br />in their surface water (SW) agxicul rural standards, they have done so in their similar <br />ground water (GW) agricultural standards (sae Tabla 5I. For the Bake of discussion, SCC <br />chooses to use those ground water use standazds fox surface water use evaluation. <br />. Parameter <br />aluminum (CDOH, GW, livestock) <br />pH (CDOH, GW, irrigation) <br />manganese (CDOH, SW, irrigation) <br />dissolved solids (USEPA, irrigation) <br />sulfate (California, irrigation) <br />Number of Sites <br />1 <br />6 <br />1 <br />3 <br />a <br />The Yoast Mine PHC (PAP Tab 17) predicts TDS incxeasae to be observed at various Stream <br />sites during the irrigation season (May-September). The following table outlines those <br />predictions along with this yeaz'a observed averages. <br />Stream Site Predicted TDS values (ma/1) Thie yeaza average TDS (mg/1) <br />YSGS 1337 1570 <br />NPDESI0 3938 1039 <br />Finally, no exceedencea of NPDES effluent criteria (permit No. CO-0000221) occurred this <br />year. <br />• <br />9 <br />