HYDRO26394

• Permit No: C1981019
• IBM Index Class Name: Hydrology
• Doc Date: 9/21/2001
• Doc Name: 1st Qtr 2001 Review Letter
• From: DMG
• To: COLOWYO COAL MINE LP
• Permit Index Doc Type: DMR’s
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St„ Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
Interoffice MEMORANDUM
to: DMR file, C-81-019
from: Byron G. Walker
subject: Review of 1~` Quarter 2001
date: June 11, 2001
DMR, C-81-019
DIVISION OF
MINERALS
GEOLOGY
RECLAMATION
MINING•SAF ETY
Bill Owens
Governor
Greg E. Walther
Executive Duedor
Michael R. Long
Division Director
re: Colowyo letter to CDPHE, April 6, 2001, Re: DMR Report for Colowyo Coal
Company, L.P.; Colorado Waste Water Dischazge Permit System Number CO-
00045161; Request for Alternate Limits, with attachments.
The ls` Quarter 2001 DMR reports were reviewed. Report entries aze consistent with observations
taken during CDMG inspections. However, no discharges appeazed to be out of compliance during
the CDMG inspection but exceedences are reported in the DMR reports.
Outfall OOlA (Streeter Pond). This pond was reported as having discharged. Pazameters other than
total suspended solids were reported as within allowable primary limits. Total suspended solids were
reported at 100 milligrams per liter (mg/1), above the permitted 70 mg/1 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 dischazge. There was no
dischazge at the time of the February 20, 2001 CDMG inspection.
Outfa11003A (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 dischazge. 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 dischazge
at the time of the February 20, 2001 CDMG inspection (dischazge appeared cleaz).
Outfall 006A (Rail Loop Pond). The average discharge from [he 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 February 20, 2001 CDMG
inspection. The SEDCAD analysis indicates a peak discharge from a 10-yeaz, 24-hour event from
the pond of 0.89 cfs (399 gpm or 0.57mgd). A compazison is as follows: (bold =report, italics =
equivalents)
Event Cfs Gage Gpm Mgd
CDMG Ins re ort 0.03 03* 0.05 17.9 0.03
DMR re ort 0.26 117 0.168
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