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• Additional monitoring will occur in the Grassy Valley to evaluate potential hydrologic <br />and hydrochemical impacts to Grassy Valley during mining. This monitoring will include <br />the following. <br />• During mining, monitoring of the piezometers in upper Grassy Valley (P-1 <br />through P-4) monthly for depth of water throughout the growing season (May <br />through October) and quarterly for water quality <br />• Monitoring of existing wells GVMW-8A and GVMW-8B monthly for depth of <br />water and field parameters (pH, temperature and specific conductance) and <br />quarterly for water quality <br />• Monitoring wells to be designated near the toe of the ECOSA to be monitored <br />monthly for depth of water and field parameters (pH, temperature and specific <br />conductance) and quarterly for water quality <br /> <br />u <br />1?1 <br />Ground water may not be encountered in some wells completed to within a few hundred <br />feet of the surface. In these cases, monitoring will be limited to checking water levels <br />(i.e., checking for the presence of water) and samples will not be analyzed unless <br />sufficient water is encountered to allow sampling and analysis of non-turbid water. <br />Table 10-2 <br />Ground Water Monitoring Sites <br />Site Number Location Monitoring Frequency <br />CRMW-3A, -3B Arequa Gulch - Downgradient Quarterly <br />SGMW-5 Squaw Gulch - Downgradient Quarterly <br />VIN-2A, -213 Vindicator Valley - Downgradient Quarterly <br />GVMW-8A, Grassy Valley - Downgradient Depth and field parameters (pH, <br />GVMW-813 temperature and specific conductance) <br /> monitored on a monthly basis. <br /> Quarterly for water quality <br />P-1, P-2, P-3, P-4 Upper Grassy Valley Depth and field parameters (pH, <br /> temperature and specific conductance) <br /> monitored on a monthly basis during <br /> growing season. <br /> Quarterly for water quality <br />WCMW-6 Wilson Creek - Downgradient Quarterly <br />PGMW-2 Poverty Gulch - Downgradient Quarterly <br />ESPMW-1 ESP - Downgradient Quarterly - pH and WAD CN <br />To be determined ECOSA - Downgradient Monthly - depth and field parameters <br /> Quarterly for water quality <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />10-3