2015-03-06_REPORT - C2009087 - Laserfiche WebLink

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Data from water samples obtained at the PSCM shop well (CTC87) for this year were infrequent as it no longer has a drinking water permit. Parameters tested include coliform bacteria, chlorine residual, disinfection by products, lead, copper, nitrate and volatile organics. All results were acceptable. Ground Water Points of Compliance Ground water Points of Compliance (GWPOC) have been established for the PSCM (PSCM PAP page 2.04 -103, Vol.l). Attachment 7 -3 of the Seneca II PAP provides the details of how the standards were established. The ground water standards for Grassy Creek Alluvial Well SGAL70 are provided in this AHR on Table 7. No exceedances of those standards were observed on samples collected from SGAL70 this year. Ground Water Quality Summary. TDS values at four of the sixteen wells sampled the year displayed increasing TDS trends. TDS trends at the remaining wells were either stable or decreasing. CDPHE agricultural ground water standards for pH, fluoride and iron were exceeded at certain monitoring wells. No GWPOC standards were exceeded this year. In the area surrounding the PSCM, ground water is not being pumped for irrigation or livestock watering purposes, nor has the CDPHE classified any aquifer in this region for any use. The above discussion is provided only to serve as a comparative basis to judge ground water quality. Domestic wells that provide drinking water for mine employees or local residents are not from aquifers impacted by mining. Surface Water Table 8 lists pertinent information on all NPDES, stream, and spring monitoring sites at the PSCM. The PSCM surface water plan is summarized on Table 2.04.7 -T11 (page 2.04 -107, Vol. 1 of the PSCM PAP) . All NPDES Discharge Points are monitored monthly for field parameters (flow, temperature, pH, and electrical conductivity) and NPDES lab parameters. Stream Monitoring Sites SSG1, SSG2 and SSLG5 are sampled three times a f:'.