HYDRO31161 - Laserfiche WebLink

Home Browse Search

COLORADO YAMPA COAL COMPANY A Cyprus Amax Company III IIIIIIIIIIIIIIII 999 Colorado ramps Loaf l;ompany 29515 Routt County Road #27 Oak Creek, Colorado 80467 (970)879-3800 April 28, 1998 Ms. Carla Lenkey RECEIVED Colorado Department of Public Health and Environment Water Quality Control Division -Permits and Enforcement APR 2 9 199E 4300 Cherry Creek Drive South Denver, CO 80222-1530 Division Of MinefalS 8 Geology RE: PFRMIT .0-0027154: MAR .H 1998 DMR SUBMITTAL Dear Ms. Lenkey: Please find enclosed the above referenced discharge monitoring report for the period from March 1, 1998 through March 31, 1998. Three permit limitation exceedences are reported for this period and two Eor the quarter. Outfall 010 incurred a permit limitation exceedence on 3/19/98 [or the monthly average of Settleable Solids. The outflow for this sample was dark and murky and couldn't provide a measurable flow. This site barely discharged only once in the sampling schedule and therefore could not be sampled again to verify this atypical value. Outfall 010 typically demonstrates compliant Settleable Solids values of <0.1. No conclusive explanation can be given for the three exceedences occurring on 3/5/98 for Outfalls 006, 009 and Permit CO-0042161 Outfall 002. These include a Total Suspended Solids monthly average of 40 mg/L Eor Outfal1006; a Settleable Solids monthly maximum of 14.1 mL/L/h for Outfa11009; and a %BODs removal of < 50 mg/L Eor OucEall 002. (This is based on the ratio of an unusually low influent to a typical effluent reading.) These samples were all received by the laboratory on the same day and all tested atypically (or their respective sites. TCC has received results on the three Outfalls in question Eor the first week of April, 1998, which indicates all parameters are equilibrating to amounts normally associated with these sites. Whole Effluent Toxicity (WET) tests were performed on Outfalls 001 and 005 the week of March 9, 1998 and OutEall 007 the week of March 24, 1998 Eor both C. drrbia and P. promelas. Outfalls 005 and 007 passed for both species with "Concentrations with Statistically Significant Difference in Lethality" reported at > 100%. Copies of the CDPS WET Test Report Forms for both species are included in the submittal. Outfall 001 is usually tested by CT&E Denver, Colorado, but TCC also had Sea Crest Group Broomfield, Colorado perform \~ET tests during the same time. CT&E failed OutEall 001 for both species with "Concentrations with Statistically Significant Difference in Lethality" reported at 100% for C. dubia and 75%Eor P. promelas. Sea Crest passed Outfall 001 for C. dubs with "Concentrations with Statistically Significant Difference in Lethality" reported at > 100%. Outfa11001 failed [or P. promelas with "Concentrations with Statistically Significant Difference in Lethality" reported at 100%. CT&E's results are reported on the DMR for consistency purposes. No accelerated testing will be performed Eor this Outfall as per the letter dated 4/13/98 addressed to Joe Shoemaker, TCC from Carla Lenkey, Water Quality Control Division. Copies of the CDPS WET Test Report Forms for both species and both laboratories are included in the submittal. All sites discharged at some point during the month except For Outfa11020 which has not yet been constructed, so there is no discharge to enable chemical or toxicological testing to date.