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• Groundwater <br />Table 5 shows the results of groundwater sampling during 1993; as <br />well as, a comparison to the baseline year of 1981. All wells were <br />completely evacuated with compressed air during the late summer. <br />Results of quality sampling are consistent with the results from <br />previous years. No significant change in groundwater quality is <br />evident between measurements taken above and below the mines. <br />The depth to water table in GW-1 has followed the cycle of high in <br />the spring and lower in the dry months of summer and fall. The <br />water level in GW-4 is somewhat deceptive since its depth appears to <br />decrease in the dryer months. This aberration is because the well <br />is near an irrigated field. Irrigation of the field influences the <br />depth to water table. The well is also nearer the bast Salt Creek <br />channel and has consistently shown lower conductivity than GW-1. As <br />explained in a previous annual hydrologic report, the well may be <br />developing more direct communication with the lower conductivity <br />surface water flows in fiast Salt Creek. <br />PROBABLB RYDROLOGIC CONSBQUfiNCBS <br />The mines will have negligible effect upon the hydrologic regime of <br />Bast 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 Bast Salt Creek has <br />• been decreased further since water is aow 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 />John M. Walters <br />Manager of Mine Services <br />lJ <br />Page - 5 1/19/94 <br />