PERMFILE61538

• Permit No: C1980005A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: NPDES PERMIT
• Section_Exhibit Name: TAB 7 APPENDIX 7-5
• Media Type: D
• Archive: Yes

COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Comral Division
Rationale -Page 4, Permit No. CO-0000221
V. PERFORMANCE H/STORY
A. Monitoring Data •
1. Discharge Monitoring Reoorts: Tables V-1 through V-7 summarize the effluent data reported on the quarterly
Discharge Monitoring Reports (OMB's) for outfalls 002, 003, 004, 006, 007, 008 and 009 at the Seneca Coal
Company facility from January 1, 1995 through December 31, 1996 (eight calendar quarters unless otherwise
noted). OutfalLs 010 and 011 reported "no discharge' during this period.
Table V 1 -Self-Monitoring ResulLS jar Outfall 001
Reported Previors No. of
Cancenlrarions Perini[ Lirrrit6lion
Parameter Avg/Min/Mas Limitation Excursions
Flow, MGD
30-day avg 0.89/0.!366/1.074 none -
daily maz 1.32/0.2261/4.7978 none -
TSS, mg/P
30-day avg 15/8/20 35 0
daily max 15/8/20 70 0
Total Iron, mg/P •
30day avg 0.11/<0.02/0.49 3.5 0
daily max 0.11/<0.02/0.49 7.0 0
Oil & Grease, mg/F none visible 10 0
pH, s. u. -/7.82/8.64 6.5-9.0 0
Total Dissolved Solids, mg/P •
30-day avg 2953/2130/3373 none -
daily mar 3236/2960/3470 none -
Whole Effluent Toxicity, Acute
Ceriodaphnia sp. 2 of 2 LC,,,> 100% LC,,,> 100% 0
Table V-2 -Self-Monitoring Results for OutfaU 003
Reported Previous No. of
Concentrations Permit limitation
Parameter Avg/Min/Mar limitation Excursions
Flow, MGD
30day avg 0.106/0.066/0.131 none -
daily Harz 0.]85/0.0977/0.2261 none -
TSS, mg/f
30day avg 24/14/52 35 1
daily max z4/14/sz 70 0
Total Iron, mg.~F
30-day avg 0.32/0.06/1.5 3.5 0
~ daily max 0.32/0.06/1.5 7.0 0
Oil 8 Grease, mg/f none visible 10 0
pH, s. u. -/7.55/8.64 6.5-9.0 0
Total Dissolved Solids, mg/f
30-day avg 2894/2167/3127 none
daily max 3138/2820/3450 none -
Whole Effluent Toxicity, Acute
!'orindnn6nin rn 2 of 2 LC__1100% LC._> 100% 0