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qualifier. In soils with a higher pH (as are found in the PSCM region), . <br />a more appropriate standard would be 10 mg/l (EPA, 1976). This year, <br />none of the PSCM alluvial wells displayed a value higher than 4.00 mg/1, <br />and no spoil wells displayed a value higher than 4.52 mg/l. <br />Wadge Underburden Well 11 exceeded the selenium standard, 20 ug/1, with <br />a value of 21.5 ug/l. This value is an anomaly; the highest previous <br />value was 6.6 ug/l (in 2007). The selenium value from PSCM's GWPOC well <br />in the Grassy Creek basin was less than the standard (see below). <br />Overburden Well COV2633 exceeded the zinc standard, 2 mg/1, with a value <br />of 3.8 mg/1. This value is and anomaly; the highest previous value was <br />0.15 mg/l. The zinc value from PSCM's GWPOC well in the Grassy Creek <br />basin was less than the standard (see below). <br />Finally, water quality analyses performed on the sample obtained at the <br />PSCM shop well (STC5) for this year were compared against both human <br />health (mandatory) and secondary (i.e., recommended but not mandatory) <br />drinking water standards developed for ground water by the CDPHE. No <br />human health standards were exceeded. The CDPHE secondary standard for <br />sulfate, 250 mg/1, was exceeded with a value of 430 mg/1. Well STC5 has <br />historically exhibited sulfate concentrations higher than the secondary <br />drinking water standard for this parameter. The CDPHE secondary standard <br />for iron, 0.3 mg/1, was exceeded with a value of 0.44 mg/1. Well STC5 <br />has occasionally exhibited concentrations higher than the secondary <br />drinking water standard for this parameter. However, bottled water is <br />consumed at the PSCM. <br />Ground Water Points of Compliance <br />A GWPOC have been established for the PSCM (PSCM PAP page 2.04-103, <br />Vol.l). Attachment 7-3 of the Seneca II PAP provides the details of how <br />the standards were established. The ground water standards for Grassy <br />Creek Alluvial Well SGAL70 are provided in this AHR on Table 7. No <br />exceedances of those standards were observed on samples collected from <br />this well this year. <br />8