HYDRO27047 - Laserfiche WebLink

Home Browse Search

;-~ '!~~ crp~us Yampa Valley iiiiiiiiiiiiiiiiiii 999 yprus Yampa Valley Coal Corporation 29587 Routt County Road #27 Oak Creek, Colorado 80467 303-8793800 July 26, 1993 Ms. Pat Nelson Colorado Department of Health Water Quality Control Division Attention: Permits and Enforcement 4300 Cherry Creek Drive South Denver, CO. 80222-1530 Dear Ms. Nelson: .1i1~.:3 ~ '993 JIYI~~.,n ~~ ,..~.~„ .,.., .....,.,.JyY RE: Discharge Monitoring Reports; NPDES Permit CO-0027154. Cvorus Yampa Vallev Coal Coro. Enclosed, please find the DMRs for the referenced permit for the month of JUNE. No exceedences were noted. Outfalls 002, 004, 006, 008, and 017 all showed no discharge during the monitoring visits for the period in question. Please note that outfall 007 discharged for a six day period, and that samples were collected in conjunction with WET testing during this time. The flow and Mn values for Outfall 007 in the Wasteload Allocation Data table reflects the maximum values obtained for the week, as both were associated with the normal sampling day for this outfall. Acute WET testing results for outfalls 001 and 005 showed no toxicity. Outfall 007 Acute WET results were reported during the previous month. Chronic WET tests for outfalls 005 and 007 showed no significant effects to either the ceriodaphs or the fathead minnows. Outfall 001 showed toxicity to both the ceriodaphs and the fathead minnows. Copies of both the Acute and Chronic WET test results have been included for your reference. As discussed with the Department, outfall 001 underwent de-watering by means of the attached sluice gate during the beginning of the month. Monitoring data do not indicate any quality problems to be associated with this activity. Please note that the flow data presented in the Wasteload Allocation Data for Outfall 019 reflects fluctuations resulting from the adjustment of the sluice gate to assess inflows and de- water the pond during the month. As discussed, sampling was conducted at the designated point on the normal schedule. At this time, the gate has been closed, and CYVCC does not anticipate the need for further adjustment in the near future.