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The Seueca II-W PHC predicts an annual average TDS value of 2630 mq/1 far Well WW1C, while <br />a value of 1015 mq/1 raa observed this year. Fox Wall WW17, a value of 3002 mg/1 xas • <br />predicted, while a value of 800 mg/1 was observed thin yeaz. <br />Compaziaon of Ground Water Quality to Water Usa Standards. SCC has compiled lists of <br />standards for irrigation (Table 5) and livestock (Table 6). Theca lists are composed <br />mostly of Colorado Depaztment of Health (CDOH) standazda, although other agencies' <br />atandazda have been used if they are more stringent or if the CDOH has no standard fox a <br />particular parameter. Sea SCC'a Yoast Mine Permit Application, Tables 7-21 and 7-23, for <br />a more detailed explanation of these standards. <br />Table 7 provides a comparison of ground rater quality to irrigation standazda. Standards <br />that rare exceeded are boron (one well), cadmium (one rell), chlorides (one wall), iron <br />(two Nells), manganese (seven relle), molybdenum (one well), dissolved solids (four <br />wells), and sulfates (ten rella). <br />Table S provides a comparison of ground rater quality to livestock standards. Standards <br />that were exceeded aze dissolved solids (two wells) and sulfates (two walla). <br />At the Seneca II-W shop roll (Well 201TC) , CDOA drinking rates standards rare used to <br />datazmine its suitability. The secondary standard fox iron (0 .3 mq/1) was exceeded rith <br />values of 2.29 and 1.95 mq/1. The secondary standard for manganese (0.05 mq/1) raa <br />exceeded with values of 0.11 and 0.11 mg/1. However, bottled water is consumed at Seneca <br />II-W. Also, since the aquifer for the shop roll (Trout Creak Sandstone) atazte at 280 <br />feet belor the wedge Coal and is eapazated by confining shale layers, rater from this wall <br />should not ba affected by mining and, therefore, reflects the natural chazactaristica o! <br />the aquifer. <br />Tab 7 of the Seneca II-W PAP contains a section that discusses the suitability of using <br />rater from the various aquifers monitored at the Seneca II-W Mina for irrigation or <br />livestock watering. The discussion mentions that all aquifers at the Seneca II-W Mina <br />have exhibited several pazameter concentrations in excess of both irrigation and livestock <br />standards compazed, rendering them goes tionabla ragazding their suitability for either <br />irrigation or livestock. All bedrock aquifers affected by mixunq have bean determined to <br />have transmiasivities lees than 1 ft2/day, rhich rould also preclude their vac for • <br />yielding sufficient rater for irrigation, oz even liwatock. <br />6 <br />