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ground water standards for Grassy Creek Alluvial Well SGAL70 are <br />provided in this AHR on Table 7.,The sole exceedance of those standards <br />was observed in May. Well SGAL70 exhibited an elevated concentration of <br />selenium, 43.70 ug/1. The September concentration decreased to 0.30 <br />ug/l. The selenium standard is 20.0 ug/l. <br />Ground Water Quality Summary. <br />TDS values at six of the 15 wells sampled this year displayed increasing <br />TDS trends. TDS trends at the remaining wells were either stable or <br />decreasing. CDPHE agricultural ground water standards for pH, fluoride, <br />iron, manganese and selenium were exceeded at certain monitoring wells. <br />The sole GWPOC exceedance in 2016 was selenium in well SGAL70 in May. In <br />the area surrounding the PSCM, ground water is not being pumped for <br />irrigation or livestock watering purposes, nor has the CDPHE classified <br />any aquifer in this region for any use. The above discussion is provided <br />only to serve as a comparative basis to judge ground water quality. <br />Domestic wells that provide drinking water for mine employees or local <br />residents are not from aquifers impacted by mining. <br />10 <br />