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t <br />pQ_4 <br /> <br />PEABODI/COAL COMPANY <br />Wo~tarn Dlvlslon <br />July 26, 1991 <br /> <br /> <br />Colorado Dept. of Health <br />Water Quality Control Division <br />4210 East 11th Avenue <br />Denver, Colorado 80220 <br />.t7~.G ~Jtne.co Jp C"7(2Qi <br />1700 Sown vale <br />FiagS~aN. Ariio~e 96001 <br />16021 77~~5257 <br />RE: Second Quarter Discharge Monitoring Reports (DMR's Permit No. <br />CO-0000221) <br />This letter provides explanatory information regarding oil and grease and <br />pH exceedances reported on the second quarter DMR's for Outfalls 003 <br />and 006, respectively. <br />The oil and grease exceedance was verbally reported on May 22, 1991, <br />with written follow-up on May 28. The letter explained the circumstances <br />surrounding the sampling and reporting of the exceedance, and discussed <br />plans to conduct additional sampling and investigate the cause and/or <br />source of the pollutant. <br />Oil and grease, and total petroleum hydrocarbon data collected at Outfall <br />003 following detection of the exceedance were all at or below detection <br />limits (see attached Table 1), indicating the probable short-duration of the <br />non-compliance Flow. The source is suspected to be the truck wash <br />settling pond located upstream of the outfall (see Figure 4, page lh of the <br />Permit for a schematic of the (low system for the 003 discharge point). <br />The settling pond was cleaned out during the period April 22-25 as a <br />matter of routine maintenance. This process involves dewalering the pond <br />as much as possible, utilizing aback-hoe or similar equipment to muck-out <br />the residue collected from washed-trucks and refilling the pond. Tlie <br />mucking-out process may have resulted in the re-suspension of oil and <br />grease laden sediment in water remaining in the bottom of the settling <br />G-17 <br />