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The Pittsburg & Midway Coal Mining Co. <br />p~M A Chevron Company <br />6400 South Fiddler's Green Circle, Englewood, CO 60111-4991 <br />Mail Adlress: P.O. Boz 0518, EnglewooC, CO BOi55fi519 <br />September 27, 1999 <br />CDPS Permit CO-0032638 <br />Colorado Department of Health <br />WQCD-PE-B2 <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80222-1530 <br />Deaz Sir/Madam, <br />Enclosed aze the Edna Mine's August water monitoring reports. DMP 001 did not dischazge <br />during the monitoring period. DMPs 004 and 007 had dischazge during the month. <br />All discharges noted for the monitoring period were within current compliance criteria, except <br />for sulfates at DMP 004. The sample representing the average 30-day value for sulfate was taken <br />on August 3, 1999. Results of the sample's laboratory analysis were received August 23, 1999. <br />DMP 004 stopped discharging between August 9, 1999 and August 16, 1999. Therefore, a <br />supplemental sample were not able to be taken. <br />The cause of the elevated sulfates pertain to a series of spoil springs and seeps upstream of DMP <br />004, a sedimentation pond. Under normal climatic conditions, precipitation within the watershed <br />serviced by DMP 004 provides sufficient dilution to enable DMP 004 to remain within the <br />permit's compliance criteria. Should DMP 004 continue to exceed the current permit criteria for <br />sulfate, P&M may need to submit a request for a permit modification to incorporate a "mass <br />balance" methodology for sulfates using the "dilution factor" criteria currently contained in the <br />permit. The dilution factor for August 3 was 0.011 while the effluent criteria is based on a <br />dilution factor of 0.10. <br />Should you have any questions regarding these reports, please contact me at your earliest <br />convenience. <br />Sincerely, <br />~--- <br />Brian D. Gontazek <br />Sr. Environmental Engineer <br />cc: Mine File <br />CDMG <br />