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• <br />Ground Water Quality Summary. TDS values at five out of the twenty two <br />wells sampled the year displayed increasing TDS trends. TDS trends at <br />all other wells were either stable or decreasing. CDPHE agricultural <br />ground water standards for pH, fluoride, iron, selenium and zinc 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 local residents <br />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. A complete description of the surface <br />water monitoring program may be found on Pages 7-336 to 7-355 of the <br />Seneca II PAP, and is summarized on pages 7-349/350. The PSCM surface <br />water plan is summarized on Table 2.04.7-Tll (page 2.04-107, Vol. 1 of <br />the PSCM PAP). All NPDES Discharge Points are monitored monthly for <br />field parameters (flow, temperature, pH, and electrical conductivity) <br />and NPDES lab parameters. Stream Monitoring Sites SSG1, SSG2, SSLG5 and <br />SSC10 are sampled three times a year for field parameters and full-suite <br />water quality. The first sample of the year is collected during the <br />spring runoff (March or April), the second sample is collected after the <br />spring runoff (May or June), and the third sample is collected during <br />base flow conditions (September). Full-suite lab samples collected at <br />all these sites were analyzed using the surface water long list, Table <br />9. At the PSCM, there are eight spoil springs that are monitored for <br />field parameters and full-suite lab samples in the spring and fall <br />seasons. <br />Surface water quality data are presented in Appendix D. The table of <br />contents of Appendix D indicates which sites carry PSCM monitoring <br />requirements (all other sites were required by the old Seneca II Mine <br />9