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~.- C ~ <br />CiiLOI~AD.U GEPARTP11:t~T OF HEAL'ih <br />. 6'aker Quality Control Division <br />Addendum - Page 3 <br />Ye emit Kum beet 00-UU27154 <br />Applicable Rules and Regulations: (Cont'd.) <br />With regard to copper, the one time analysis showed a maximuc: of .U2 mg/1, the <br />average copper value from the data submitted was .016 mg/1 which is still <br />above the stream standard of .U1 mg/1. <br />Dissolved manganese in the one time analysis also exceeds the stream <br />standard. k:owever, the average manganese value is below the streaa standard. <br />For silver, the detection limit is above the stream standard and thus i[ <br />cannot be determined if the standard can be achieved. <br />In the case of zinc, the mar.imum one time analysis value is greater than the <br />stream standard but the average value is less . <br />Sulfate concentrations in [he aquifer water also exceed water quality standard <br />values. k:oa•ever, a sulfate limitation will not be placed ir, the pet'mit fur <br />the following reasons. Based on [he i:.fcrmation provided by the 'mater 4ualfty <br />Control Commission in setting stream standards, the 250 mg/1 sulfate standard <br />has been established by EPA for a "finished" drinking water suppl;:. The <br />Commission, in order to maintain the water supply use, has suggested <br />• application of this standard at water supply intakes. The nearest do:anstream <br />community wacer supply is on the Yampa River at Craig, Colorado. <br />No reports of excessive sulfate concentrations have been received by .he <br />Division. Thus, there is no need to impose a sulfate limitation at the point <br />of discharge. Should future reports indicate a sulfate probles ir. drinking <br />wacer, this oermic may he reopened and modified. <br />When effluent limitations are calculated the stream standard converts to a <br />30-day average. The daily ma::imum concentration is generall}• twice the 30-day <br />average value. <br />The annual seven da}• ten year low flow (Q7_lU) for Foidel Greek is zero. <br />This information is based on L'sGS scream gage 09243b00 located on Foidel Creek <br />approximately 6.5 river miles upstream from the con:luence of Foidel 'Creek and <br />Trout Creek. <br />In addition co an annual low flow determination, seasonal low flows were <br />calculated for the periods of March-June, July-October and November-February. <br />All seasonal low flows were found to be zero. The period of record was '_97b <br />to 1979. Since [he Q7_lU is zero for all seasons, instteam wacer quality <br />standard (WQS) values become the effluent limitations for [}:e permit for <br />discharge point 005. <br />For the other discharge points associated with s~dimentatior. ponds, neu <br />• effluent limitations will also be added. These ef`luenc limitations ure the <br />rtsuit of promulgation of Federal Ges[ available Technolugy Econo::icaiiy <br />Achievable (BAT) rules. <br />