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DMR Copy of Record <br />Permit <br />Permit #:CO0045161 Permittee:Colowyo Coal Co LP Facility:COLOWYO MINE <br />Major:No Permittee Address:PO Box 33695 <br />Denver, CO 80233-0695 <br />Facility Location:5731 SOUTH HIGHWAY 13 <br />MOFFAT COUNTY, CO 81641 <br />Permitted Feature:014 <br />External Outfall <br />Discharge: 014-A <br />Section 26 Pond to Collom Creek <br /> <br />Report Dates & Status <br />Monitoring Period:From 04/01/19 to 04/30/19 DMR Due Date:05/28/19 Status:NetDMR Validated <br />Considerations for Form Completion <br />Alternate limitations for TR iron and settleable solids - see pp 15. Oil and grease - see I.C.1.b, pp 5-6. Reports SAR calculated limit at MLOC=EG; adjusted SAR effluent at MLOC=P. <br />Principal Executive Officer <br />First Name:Barbara Title:SVP, Policy and Compliance, CCO Telephone:303-452-6111 <br />Last Name:Walz <br />No Data Indicator (NODI) <br />Form NODI:-- <br />Parameter Monitoring Location Season #Param. NODI Quantity or Loading Quality or Concentration # of Ex.Frequency of Analysis Sample Type <br />Code Name Qualifier 1 Value 1 Qualifier 2 Value 2 Units Qualifier 1 Value 1 Qualifier 2 Value 2 Qualifier 3 Value 3 Units <br />00400 pH 1 - Effluent Gross 0 -- <br />Sample =8.77 =8.77 12 - SU <br />0 <br />DL/DS - Daily When Discharging GR - GRAB <br />Permit Req. >=6.5 MINIMUM <=9 MAXIMUM 12 - SU 02/30 - Twice Per Month GR - GRAB <br />Value NODI <br />00530 Solids, total suspended 1 - Effluent Gross 0 -- <br />Sample <br /> <br /> <br />Permit Req. <=35 30DA AVG <=70 DAILY MX 19 - mg/L 02/30 - Twice Per Month GR - GRAB <br />Value NODI A - General Permit Exemption A - General Permit Exemption <br />00980 Iron, total recoverable 1 - Effluent Gross 0 -- <br />Sample <br /> <br /> <br />Permit Req. <=1000 30DA AVG <=6000 DAILY MX 28 - ug/L 02/30 - Twice Per Month GR - GRAB <br />Value NODI A - General Permit Exemption A - General Permit Exemption <br />50050 Flow, in conduit or thru treatment plant 1 - Effluent Gross 0 -- <br />Sample =0.006 =0.006 03 - MGD <br />0 <br />DL/DS - Daily When Discharging IN - INSTAN <br />Permit Req.<=.43 30DA AVG Req Mon DAILY MX 03 - MGD 01/30 - Monthly IN - INSTAN <br />Value NODI <br />Submission Note <br />If a parameter row does not contain any values for the Sample nor Effluent Trading, then none of the following fields will be submitted for that row: Units, Number of Excursions, Frequency of Analysis, and Sample Type. <br />Edit Check Errors <br />No errors. <br />Comments <br />The discharge sample that was collected on 4/11/2019 contained 37 mg/L of TSS (monthly average limit is 35 mg/L). Based on the enclosed information on precipitation/snowmelt events preceding the discharge of 4/11/2019, Tri-State requests determination that the alternate limitations for <br />"precipitation less than or equal to the 10yr, 24hr storm event (or snowmelt of equivalent volume)" apply to the discharge at this location, per Part I.1.C.1.b and page 15 of the permit. Blizzard conditions in Mid-March led to heavy snow accumulation (estimated at 36.14 inches of snow <br />between March 6 and April 11), and subsequent warm temperatures in early April resulted in high volumes of snowmelt (as recorded in the attached graph of precipitation and temperature for March and April). The pond was properly operated and maintained prior to and during the storm <br />event and subsequent snowmelt (based on routine pond inspections, as required by Part I.B.1 (Facilities Operation and Maintenance). Based on visual observation, and increased daily air temperatures in early April, the April 11, 2019 sample was collected within 48hrs of pond inflow from the <br />snowmelt event. Therefore, the ELG-based TSS limits do not apply to the discharge on 4/11/2019 but rather compliance is based on alternate limits of Settleable Solids (per Alt Limits table on page 15 of the permit) . The 4/11/2019 sample contained 750 ug/L of Total Iron and <0.5 mL/L/Hr of <br />Settleable Solids. Frequency of analysis for all parameters was DL/DS because Pond 014 discharged only once during the month of April. <br />Attachments <br />Name Type Size <br />Colowyo_March_Early_April_2019_Temp_Precip.pdf pdf 112081 <br />Report Last Saved By <br />Colowyo Coal Co LP <br />User:dcrosby@tristategt.org <br />Name:Darlene Crosby <br />E-Mail:dcrosby@tristategt.org <br />Date/Time:2019-05-23 09:09 (Time Zone: -06:00) <br />Report Last Signed By <br />User:BARBARAWALZ1 <br />Name:Barbara Walz <br />E-Mail:bwalz@tristategt.org <br />Date/Time:2019-05-23 13:33 (Time Zone: -06:00)