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• Surface Water Morirbring Programs During and After Acfive Mining Operations <br />Surtace water monitoring during and after mining at the NH1 and NH2 mining areas will be <br />essentially the same as the existing monitoring programs. As changes and revisions of the existing <br />monitoring program become necessary, Wr=C will contact the CDMG and discuss any changes in <br />the monitoring program. Then a minor permit revision to the existing permit will be written and <br />submitted to the CDMG. <br />Surface Water Quality Sample Harxfling, Preservation, and Arelysis <br />Surface water quality samples are collected by grab sampling or using a depth integrated sampler. <br />Table 15-2 indicates the sample type, preservative, and bottle type nececessary for analysis of the <br />particular constituents shown. Raw and/or raw acidified water samples are taken from the sampling <br />site and placed into specially prepared sample bottles. The water samples are chilled by packing in <br />ice and shipped to WFC's present contract laboratory (ACZ Laboratories, Steamboat Springs, <br />Colorado). Laboratory procedures are consistent with those outlined in the U.S. Environmental <br />Protection Agency's Manual Methods for chemical Analysis of Water and Waste (1983). <br />• All surface water samples are field tested for PH, temperature, and conductivity at the time they are <br />collected. The PH meter used to measure field~etermined PH values at the NH1 and NH2 mining <br />area is calibrated by performing iwo point calibrations prior to each daily round of monitoring <br />activities and one point calibration prior to each measurement using buffer solution of know PH <br />values obtained from outside laboratories. Three buffer solutions are used for calibration: 1) PH 10, <br />2) PH 7, and 3) PH 4. The buffer solutions are replaced monthly to ensure accurate calibration of <br />the meter. <br />• <br />(Revised 12-31-96~ 1 ~} <br />