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i ~. ,, - r ""~ PEABODY ,WESTERN, Peabody Western Coal Company Ms. Patricia A. Nelson, P.E. Industrial Unit Chief Permits and Enforcement Section Water Quality Control Division Colorado Department of Health 4300 Cherry Creek Drive South Denver, CO 80222-1530 July 28, 1993 RECEIVED AUG 2 1993 D;r,,;:~,; c, alulera), 8 Geolo9Y RE: TS8 Excursions, Second Quarter 1993 NPDES Permit No. CO-0037656 (Mesa Gravel); NPDES Permit No. CO-0000221 (Seneca Mine Complex) Dear Ms. Nelson: Please find enclosed Discharge Monitoring Reports (DMR) for NPDES Permits CO-0037656 (Mesa Gravel), CO-0000221 (Seneca Mine Complex), and COG-850008 (Hayden Gulch Terminal, Inc.) held by Peabody Western Coal Company (PWCC). TSS (total suspended solids) values exceeding permit maximum levels were measured at three discharge sites during the second quarter monitoring period of 1993; these noncompliance discharges are discussed below. Since the TSS excursions did not endanger health or the environment, the exceedences were not orally reported to the Water Quality Control Division within 24 hours. TSS measurements made during June at Outfall 001, Permit No. CO- 0037656 (Mesa Gravel) exceeded both the seven day and monthly limits. TSS values of 2, 72, and 24 mg/1 were measured during the seven day period starting 6/24/93. The source of water for these discharges was mine pit pumpage. Water pumped from the mine pits was conveyed to the 001 sediment pond via an unlined ditch approximately 200 yards long. Since the mine pit water was clear, the TSS excursions were likely due to sediment from the unlined ditch. PWCC has remedied this problem by extending the hose from the pump located in the mine pit so that the pit water is contained until it reaches the sediment pond. Noncompliance TSS values were also measured at Outfalls 005 and 006, Permit No. CO-0000221 (Seneca Mine Complex). At 005, the 30-day average limit of 35 mg/1 TSS was exceeded during the months of April and May, when monthly average TSS values of 38 and 56 mg/1, respectively, were measured. The daily maximum TSS value (70 mg/1) was also exceeded on 5/11/93 when a TSS value of 232 mg/1 was recorded. The noncompliance TSS values at Outfall 005 were measured during a period of time when Pond 005 had to be dewatered. A leak was discovered around the outlet pipe, so it was necessary to rapidly dewater Pond 005 periodically to III IIIIIIIIIIIIIIII ple~-e ~'~~ Peabody Western Coal Company • 1300 Swirh Yale Street • Flagstaff, Arizona 86001 • Tabphone )60]) 774-3253 • Fax (60R) 777.4396