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,~ <br />RECEIVED ~II II~I~III~~~~~ ~~~ <br />~~~ JAN 22 2002 <br />s ENEC.A Division ofMineralsdGeology Seneca Coal Company <br />Coal Company <br />January 11, 2002 <br />Colorado Department of Health <br />WQCD-PE-B2 <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />RE: Quarterly Discharge Monitoring Report for Permit CO-0000221 <br />Dear Sir or Madam: <br />Pursuant to the quarterly reporting requirements contained in <br />Colorado Discharge Permit CO-0000221 for the Seneca Mine Complex, <br />enclosed find the fourth quarter 2001 discharge monitoring <br />reports for Sites 002 to 006 and. 008 to 017. In this quarter, no <br />discharges occurred at Points 005, 009, 011, 014 and 015. Weekly <br />monitoring at Points 015 and 016 was discontinued after November <br />21 due to deep snow that prohibited vehicle access. Monthly <br />monitoring at 015 and 016 was performed by snowmobile. Points 013 <br />and 017 have not been constructed yet. Construction of Pond 014 <br />was completed in September 2001, no discharge has occurred yet. <br />Point 012 experienced an excursion of the 30-day average .total <br />suspended solids (TSS) limit of 35 mg/1 with a value of 60 mg/1 <br />measured from a sample collected October 11. A retest that <br />sample performed on December 3 resulted in a measured TSS value <br />of only 8 mg/1 (see attachment). Also, this sampling event <br />occurred wit in 48 ouh rs after a inc rain a~event-rrss" <br />than 10 year/24 hour rainfall event), and therefore the alternate <br />limit (settleable solids 0.5 ml/1) should apply. Settleable <br />solids on the October 11 sample was less than 0.4 ml/1. A copy of <br />the rainfall chart from the Seneca lA Site (4.7 miles from Point <br />012) has been attached. On this chart, vertical divisions are <br />0.05 inches, horizontal divisions are 8 hours, and the days of <br />the month are displayed at the bottom. <br />Please contact me at 970-276-5109 if you have any questions. <br />cc: <br />Sincerely, <br />~~SL~..w~ C9.- <br />Dennis Jones <br />Hydrologist I <br />Division of Minerals and Geology <br />Seneca Coal Company P.O. Drawer D Hayden, Colorado 81639 <br />Telephone (970) 276-3707 FAX (970) 276-3014 <br />