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<br /> <br />Groundwater <br />• Table 5 shows the results of groundwater sampling during 1993; as <br />well as, a comparison to the baseline year of 1961. Results of <br />quality sampling are consistent with the results from previous years <br />and identify a potential problem with the required monitoring <br />locations. Ground water is being sampled at SW-1 above the mines <br />and GW-4 between McClane and Munger Canyons. GW-4 is in close <br />proximity to a hay field that is irrigated during dry periods. As <br />suggested in previous reports, the ground water at this location <br />appears to be effected by the irrigation practices in the area. <br />Note the high SWL during the driest period of 1994. The electrica l <br />conductivity of the ground water also appears to be lower than that <br />of GW-l. This is due to dilution of the higher electrically <br />conductive ground water flowing through the alluvium of the East <br />Salt Creek alluvium with the lower conductive surface water used to <br />irrigate the field. GVC proposes to begin sampling GW-3 rather than <br />GW-4. GW-3 is located adjacent to the road south of GW-4 and should <br />be outside of the influence of the irrigation of the hay field. <br />Refer to Figure 4.2-2 of the McClane Canyon Permit. GVC will be in "r/L ? <br />contact with DMG to obtain approval for this substitution.. <br />PROBABLE HYDROLOGIC CONSfiQUENCES <br />The mines will have negligible effect upon the hydrologic regime of <br />fiast Salt Creek. The area disturbed is small, sedimentation and <br />surface water systems have functioned well for over ten years. Most <br />storm events that have exceeded the design criteria required by CMLR <br />have not been a problem for the system to handle. The effect that <br />• . the mine has on the groundwater hydrology of East Salt Creek has <br />been decreased further since water is now being imported to the mine <br />and no further dewatering will take place until water in 001 North <br />Section backs up to the seals and is drained to the water sump. <br />This water will then be used in the mining process. <br />If there are questions or if I can be of further assistance please <br />contact me. ' <br />Sincerely, <br />ohn M. Walters <br />Manager of Mine Services <br />• <br />Page - 5 1/25/95 <br />