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<br /> <br />Ms. Claire Semmer - 2 - December 29, 1986 <br />/2. Please commit to placing water elevation measuring devices on streams <br />tl immediately adjacent to alluvial monitoring sites. This information wilt <br />~"'~~ be used to Correlate discharge and recharge of the alluvium with the <br />stream. <br />3. The Division requests more detailed monitoring of Site 62, and recommends <br />that it be considered a general surface water site for purposes of the <br />monitoring plan. During 1986, a substantial quantity of water discharged <br />from this site despite minimal operational activities. The source of <br />Inl~ ~ this discharge is not clear at this time. Some surface water runoff was <br />VV 11 undoubtedly present. Groundwater flow through the Fish Creek Tipple <br />~," bench may have been responsible, or there may have been some groundwater <br />,~ contribution from Mine 3 spoils south of the facility. The Division <br />1,~\ ~' Giou3d like the source of this water to be better characterized and <br />W ~r~~ ~ consequently also requests that water utilization records be submitted <br />~ ,.from the well at the loadou£ to use in differentiating between <br />~(Y`~~r~d operati on-generated flows and other flows. <br />u <br />Include aluminum, copper and lead in the surface water parameter list and <br />add molybdenum to the groundwater monitoring list. Commit to monitoring <br />concentrations of nitrate, nitrite and nickel on both the ground water <br />and surface water list. Our rationale is as follows: <br />The Division requests continued monitoring of aluminum, copper and lead <br />because the downstream site, 1003, identified average concentrations for <br />these metals at levels approaching or higher than receiving stream <br />standards: <br />Average Concentrations of Selected Metals at Site 1003, 1985 <br />Average Concentration Receiving Stream Standard <br />Metal (mq/1) (mg/1) <br />AT-'- o. <br />Cu 0.02 0:022 <br />Pb 0.03 0.025 <br />Mo 0.12 O.Oi <br />As noted above, molybdenum values also exceed the agriculturally-based <br />receiving stream standard. The monitoring plan proposes to restrict <br />monitoring of molybdenum to surface waters. At this time it appears <br />appropriate to add molybdenum to the parameters monitored at groundwater <br />alluvial sites. <br />Nitrogen species are being analyzed currently as N03-NO2. Both <br />nitrate and nitrite have receiving stream standards; these are 10 mg/1 <br />and 0.05 mg/1 re spec tiveTy. The recent reported concentrations of <br />N03-P102 far exceed the receiving stream standard of N02 of 0.05 <br />mg/1, (Site 1003, 1985 average, equaled 4.3 mg/1 ). Thus it is necessary <br />to analyze these parameters separately. <br />Overburden geochemistry analyses from Mine 3 suggest that nickel could <br />present a water quality problem. The Division requests that nickel be <br />monitored to evaluate the status of this prediction. <br />