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Finally, water quality analyses performed on samples obtained at the <br />Seneca II shop well (STCS) for this year were compared against both <br />human health (mandatory) and secondary (i.e., recommended but not <br />mandatory) drinking water standards developed for ground water by the <br />CDOH. No human health standards were exceeded. The CDOH secon dary <br />standard for sulfate, 250 mg/1, was exceeded twice with values of 350 <br />and 400 mg/1. Well STCS has historically exhibited sul fate <br />concentrations higher than the secondary drinking water standard for <br />this parameter. The CDOH secondary standard for iron, 0.3 mg/l, was <br />exceeded once with a value of 0.43 mg/1. However, bottled water is <br />consumed at Seneca II. <br />Ground Water Quality Summary. TDS values at nine out of the nineteen <br />wells sampled the year displayed increasing TDS trends. TDS trends at <br />all other wells were either stable or decreasing. CDOH agricultural <br />ground water standards for pH, fluoride, iron, and manganese were <br />exceeded at certain monitoring wells. In the area surrounding Seneca <br />II, ground water is not being pumped for irrigation or livestock <br />watering purposes, nor has the CDOH classified any aquifer in this <br />region for any use. The above discussion is provided only to serve as a <br />comparative basis to judge ground water quality. Domestic wells that <br />provide drinking water for local residents are not from aquifers <br />impacted by mining. <br />Surface Water <br />Table 7 lists pertinent information on all NPDES, stream, and spring <br />monitoring sites at the Seneca II Mine. A complete description of the <br />surface water monitoring program may be found on Pages 7-336 to 7-355 of <br />the Seneca II PAP, and is summarized on pages 7-349/350. NPDES <br />Discharge Point 003 is monitored weekly for field parameters (flow, <br />temperature, pH, and electrical conductivity). Points 002, 004 and 008 <br />are monitored monthly for field parameters. All four NPDES sites are <br />monitored monthly for NPDES parameters. Stream Monitoring Site SSG2 is <br />monitored for field parameters monthly from March through October. This <br />site, as well as Sites SSGI, SSG3 and SSLGS, are sampled three times a <br />10 <br />