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A comparison of the water quality parameters in East Salt Creek shows no significant water <br />• quality changes between samples taken above and below the mine. The inherent poor quality of <br />surface water in the azea is the result of site specific environmental factors not from any impact <br />caused by the mines. <br />Water samples coliected show that the quality of the water is generally the same as for <br />previous years. Storm events lazge enough to cause runoff in all creeks cause high levels of total <br />suspended solids and other flow dependent parameters. These events can also cause increased <br />concentrations of soluble parameters that have been flushed from the normally dry creek beds <br />above the mines. The Division's review of the 1992 annual hydrologic report revealed that <br />Manganese concentrations were high both above and below the operations. The 1996 water yeaz <br />Manganese concentrations were significantly lower than previous years and aze shown below. <br />LOCATION East Sa <br />Above <br />SW-1 <br />4TH Q '95 0.530 <br />1 ST Q'96 0.012 <br />2ND Q '96 0.064 <br />3RD Q'96 0.105 <br />• <br />It Creek <br />Below <br />SW-8 <br />0.439 <br />0.004 <br />0.041 <br />0.050 <br />Mc( <br />Above <br />SW-5 <br />DRY <br />DRY <br />DRY <br />DRY <br />:lane Creek <br />Below <br />SW-2 <br />DRY <br />DRY <br />DRY <br />DRY <br />Munger `` <br />SW-3 ? ~a_ <br />Y ~,,,,~f-cdyy~Dlj~ <br />DRY nt-~"ll lr <br />DRY ~' ~ p~?J-' ~~ <br />Groundwater <br />Table 5 shows the results of groundwater sampling during 1996. The average static water <br />level for the baseline years of 1981 and 1986 is also shown. Results of quality sampling are '` <br />consistent with the results from previous years. GW-4 in close proximity to a hay field that is <br />irrigated during dry periods and in danger of being eroded with an oxbow, has been replace with <br />GW-3. GW-3 is located adjacent to the road south of GW-4 and should be outside of the <br />influence of the imgation of the hay field. Refer to Figure 4.2-2 of the McClane Canyon Permit. <br />DMG has approved this substitution. <br />PROBHBLE HYDROLOGIC CONSEQITENCES <br />The mines will have negligible effect upon the hydrologic regime of East Salt Creek. The azea <br />disturbed is small, sedimentation and surface water systems have functioned well for over ten <br />yeazs. Most storm events that have exceeded the design criteria required by DMG have not been <br />a problem for the system to handle. The effect that the mine has on the groundwater hydrology of <br />East Salt Creek has been decreased further since water is now being imported to the mine and no <br />further dewatering will take place until water in 001 North Section backs up to the seals and is <br />drained to the water sump or water is intersected east of the current workings. <br />If there are questions or if I can be of further assistance please contact me. <br />I ~~ <br />Sincerely, /~~ <br />oha M. Walters <br />Manager Ctf Mine Services <br />AHR - 96 <br />Page - 4 <br />1-16-97 <br />