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STATE iii iiiiiiiiiiiii iii OF COLORADO DIVISION OF MINERALS AND GEOLOGY Deparlmenl of Natural Resources 1313 Sherman SL, Roam 215 u I v 15 1 0 N O F Dnnver, Colorado 80203 Phone: 1303) A66-3567 MINERAL S FA\: I:i03)A32-A106 & GEOLOGY Interoffice MEMORANDUM RECLAMATION MINING•SAFETY Bill Owens to: DMR file, C-81-019 c°`'efn°` from: Byron G. Walker ~ ereg e. warner subject: Review of Is` Quarter 2001 DMR, C-81-019 E Kecmrve Director Michael R. Lons date: June 11,2001 Drvumn Duecto~ re: Colowyo letter to CDPHE, April b, 2001, Re: DMR Report for Colowyo Coal Company, L.P.; Colorado Waste Water Discharge Permit System Number CO- 00045161;Request for Alternate Limits, with at tachments. The l~' Quarter 2001 DMR reports were reviewed. Report entries are consistent with observations taken during CDMG inspections. However, no discharges appeared to be out of compliance during the CDMG inspection but exceedences are reported in the DMR reports. Outfall 001 A (Streeter Pond). This pond was reported as having discharged. Parameters other than total suspended solids were reported as within allowable primary limits. Total suspended solids were reported at 100 milligrams per liter (mg/I), above the permitted 70 mg/l maximum. An average of 0.142 MGD was reported (99 gpm). A flow of 54 gpm was observed from the Streeter Pond during the April 18, 2001, 90 gpm during the Mar 21 2001, 157 gpm during the February 20, 2001 and 40 gpm during the December 5, 2000 CDMG inspections. Outfall 002A (Facilities Area Pond). This pond was reported as having no discharge. There was no discharge at the time of the February 20, 2001 CDMG inspection. Outfall 003A (Loadout Pond). This pond was reported as having an average of 13 gpm discharge. There was no observation recorded in the CDMG inspection reports for the period. Outfall 004A (Gulch A Pond). This pond was reported as having no discharge. There was no discharge from this pond at the time of the February 20, 2001 CDMG inspection. Outfall OOSA (Stoker Coal Pond). This pond was reported an average discharge of 13 gpm. It was also reported out of compliance for TSS (120 vs. 70 Max). There was an estimated 20 gpm discharge at [he time of [he February 20, 2001 CDMG inspection (discharge appeazed clear). Outfall 006A (Rail Loop Pond). The average discharge from the pond was reported as 0.168 mgd average discharge (117 gpm or 0.26 cfs), and being out of compliance with TSS, SS, and iron. There was a discharge of 0.4 cfs (179 gpm or 0.26 mgd) at the time of the Febntary 20, 2001 CDMG inspection. The SEDCAD analysis indicates a peak discharge from a ]0-year, 24-hour event from the pond of 0.89 cfs (399 gpm or 0.57mgd). A comparison is as follows: (bold =report, italics = e uivalents) Event Cfs Gage Gpm Mgd CDMG Ins re ort 0.03 03* 0.05 17.9 0.03 DMR re ort 0.26 1 /7 0.168