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L <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />William J. Carter March 12, 1998 <br />Re: Response to Susan Burgmaier's comments on the 1996 Annual Hydrologic Report <br />pH (minimum-maximum) 7.89 s.u. <br />Oil and Grease <5 mg/1 <br />A sample was taken on February 22, 1996 at the dischazge sample point for Pond B. Pond B <br />did not begin discharging until February 22, at which time the sample was taken. In <br />accordance with Colorado Wastewater Discharge Permit System, Permit No. CO-0000132, <br />July 1, 1992, the effluent parameters, alternate discharge limitations for any discharge or <br />increase in volume of a dischazge caused by precipitation within any 24-hour period greater <br />than the 10-year, 24-hour event (or series of storms or snowmelt of equivalent volume), and <br />sample results for the sample taken at Outfall 012 are: <br />Effluent ParameterParameter D it ax Sample Result <br />Flow Report 0.324 MGD <br />Total Suspended Solids Report 70 mg/1 <br />Total Iron Report 3.85 mg/I <br />Settleable Solids Report <0.1 mUl <br />Tota] Dissolved Solids Report 305 mg/1 <br />pH (minimum-maximum) 6.5-9.0 s.u. 8.21 s.u. <br />Oil and Grease 10 mg/I <5 mg/I <br />A sample was taken on November 24, 1997 at the discharge sample point for Pond B. Pond <br />B was drained, in accordance with Colorado Wastewater Discharge Permit System, Permit <br />No. CO-0000132, December I, 1996, in preparation for modifications to the pond to contain <br />the increased drainage azea required by the surface coal handling modifications, following <br />Technical Revision Number 29. The effluent parameters, discharge limitations, and sample <br />results for the sample taken at Outfall 012 are: <br />' Effluent Parameter Dailv Max Sample Result <br />Flow Report 0.03 MGD <br />Total Suspended Solids 70 mg/1 10 mg/1 <br />Total Iron 6.0 mg/1 0.07 mg/1 <br />Settleable Solids Report <0.1 mUl <br />Oil and Grease 10 mg/l <5 mg/l <br />' pH (minimum-maximum) 6.5-9.0 s.u. 8.52 s.u. <br />' The additional downstream monitoring site, NF-3, was requested by the Colorado Division of <br />Minerals and Geology on May 8, 1997, as part of the adequacy review for Technical Revision <br />Number 29, for the surface modifications to implement longwall mining at the Sanborn Creek <br />' Mine. On June 18, 1997, in response to Comment 65 of the adequacy review, a commitment to the <br />downstream monitoring site, NF-3 was made. It was noted at that time: "The possibility exists that <br />leakage from old piping for the Town of Somerset sanitary sewer system may be entering the river <br />' 18 <br />/1 <br /> <br />