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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br /> <br />Kcn Coa! Compairy 1991 Aiunml Hydroloby Report ~ 11 <br />6.0 MINE AREA SURFACE WATER <br />There was little runoff generated by either snowmelt or rainfall at the Kerr Mine <br />during the 1991 Water Year. Three Surtace Water Discharge Points, site 304 <br />(Pond D), site 305 (Pond E) and site 321 (Pond F) experienced discharge <br />during the spring of 1991. Sampling was performed weekly and all samples <br />collected were analyzed for the constituents required by NPDES Permit No. CO- <br />0030724 and the approved Monitoring Schedule. Table 6, 1991 Surface Water <br />Statistics -Sediment Ponds presents a summary of the data. <br />Surface Water Monitoring Stations 300, 306, 314 and 327 experienced flow <br />during the spring runoff from snowmelt as shown on Table 7, 1991 Surface <br />Water Statistics -Selected Surtace Sites. Some water was collected in sumps <br />in Pit 1 (site 328) during the 1991 Water Year. The majority of the water was a <br />result of snowmelt and precipitation. The surface water sites were sampled on <br />a weekly basis during March through June and monthly thereafter. All samples <br />were analyzed for constituents outlined in the Monitoring Schedule. <br />The field data collected are presented in Exhibit 1, 1991 Field Data and the <br />results of the laboratory analyses are presented in Exhibit 6, 1991 Mine Area <br />Surface Water Quality Analyses. <br />Seasonal variations in flow and water chemistry for sites 300, 306, 314 and 327 <br />are illustrated in Exhibit 7, 1991 Mine Area Surface Water Hydrographs. As in <br />previous years, the hydrographs show that indicator parameters are flow <br />dependent; that is, as flow increases, pH and TDS generally decrease while TSS <br />increases. Please note that data points shown as zero on the hydrographs, for <br />flow, represent either no flow or a trace. For quality parameters, zero indicates <br />that the value was below laboratory detection limits. Please refer to the tables <br />for actual values. <br />ACZ lnc. • P.O. Bo.r 77!018 • Steamboat Spnngt, Colorado san • (3031879-6?60 <br />