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Ground Water Points of Compliance <br />A GWPOC have been established for the PSCM (PSCM PAP page 2.04 -103, <br />Vol.1). 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 />Ground Water Quality Summary. TDS values at five of the seventeen wells <br />sampled the year displayed increasing TDS trends. TDS trends at the <br />remaining wells were either stable, decreasing or could not be <br />determined (due to the limited number of samples collected so far). <br />CDPHE agricultural ground water standards for pH, fluoride and iron were <br />exceeded at certain monitoring wells. No GWPOC standards were exceeded <br />this year. In the area surrounding the PSCM, ground water is not being <br />pumped for irrigation or livestock watering purposes, nor has the CDPHE <br />classified any aquifer in this region for any use. The above discussion <br />is provided only to serve as a comparative basis to judge ground water <br />quality. Domestic wells that provide drinking water for mine employees, <br />or local residents are not from aquifers impacted by mining. <br />Surface Water <br />Table 8 lists pertinent information on all NPDES, stream, and spring <br />monitoring sites at the PSCM. The PSCM surface water plan is summarized <br />on Table 2.04.7 -T11 (page 2.04 -107, Vol. 1 of the PSCM PAP). All NPDES <br />Discharge Points are monitored monthly for field parameters (flow, <br />temperature, pH, and electrical conductivity) and NPDES lab parameters. <br />Stream Monitoring Sites SSG1, SSG2 and SSLG5 are sampled three times a <br />year for field parameters and full -suite water quality. The first sample <br />of the year is collected during the spring runoff (March or April), the <br />second sample is collected after the spring runoff (May or June), and <br />the third sample is collected during base flow conditions (September). <br />Lab samples collected at all these sites were analyzed using the surface <br />water parameter lists shown on Table 9 and 9A. At the PSCM, there are <br />8 <br />