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PERMITTEE NAMEIADDRESS ( Indude Facility Name /LocationifDifferent) NAME: Oxbow Mining LLC ADDRESS: PO Box 535 Somerset, CO 81434-0535 FACILITY: SANBORN CRK & ELK CRK MINES LOCATION: 3737 HIGHWAY 133 SOMERSET, CO 81434 ATTN: Mike Ludlow Exec VP NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPOES) DISCHARGE MONITORING REPORT (DMR) 000000132 014-A PERMIT ER DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 03/01/2015 03/31/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SURF RUNOFF TO N FK GUNNISON R External Outfall No Discharge NAMEITITLE PRINCIPAL EXECUTIVE OFFICER 1 cartdy, under penalty of lawthat this documerd and all attachments were prepared under mydvechon or TELEPHONE DATE supernamn in acoonlance with a system designed to assure that qualRled personnel property gather and eiraluate the information submitted. Based on my Inquiry of the person or persona wbo manage Me t tk o h-3 system, or those persons directly responaibie for gathermg the Information, the mformatton submitted s, (A qq Lett to the bast of my es for ub and Dials true, accurate, and complete I am aware that there are srgnmcam pena�ea for submtttlng false Information. Including the possibility of Me and onprisommerd for SIGNATURE OF PRI IPAL EXECUTIVE OFFICER OR '^9 TYPED OR PRINTED tovmq Wolabors. AUTHORIZED AGENT ARFA Code NUMBER MMIDD/YYYY COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR — 10YR,24HR PRECIP EVENT;SETTLEABLE SOLIDS LIMIT MAY BE WAIVED FOR >10YR,24HR EVENT -SEE IA.1,PP 4-5, AND I.A.2, P. 5 FOR RQMNTS.TDS MONITORING -SEE PART VIA.2.G OF RATIONALE. 30 DAY AVG. IS HIGHEST MONTHLY AVG. DURING PERIOD REPRTD. EPA Form 3320 -1 (Rev.01106) Previous editions may be used. 10/17/2013 Page 1 QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS -HYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE •'�•'• " "* *" wwwwww wee +H MEASUREMENT 004001 0 PERMIT "* "• *" '•'*"* " "* 6.5 *""*"" 9 SU Monthly INSITU Effluent Gross REQUIREMENT MINIMUM MAXIMUM Solids, total suspended SAMPLE ****** *'••`• *•***° ••*••• MEASUREMENT 0053010 PERMIT ***•** •**••* '*'**« `•**" 35 70 mg /L Monthly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX Solids, settleable SAMPLE • * *• *• **` * ** ••**•* **' **• MEASUREMENT 005451 0 PERMIT "•*••• *****` ••••*• ***••' Req. Mon. Req. Mon. mUL Monthly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX Iron, total [as Fe] SAMPLE '*•••• •*** « • " "" '*•«'* MEASUREMENT 0104510 PERMIT •••••• ***•** ••'*** *'• * *' 3000 6000 ug /L Monthly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX Oil and grease SAMPLE "*•••• ****** ••••*• *"*'"* "`•••• MEASUREMENT 0358210 PERMIT "'*'* •"•'* '^'"*"* ""'""* '*"*" 10 mg /L Contingent GRAB Effluent Gross REQUIREMENT INST MAX Flow, in conduit or thru treatment plat SAMPLE ••"" ••**"' ** ** *" "'* MEASUREMENT 5005010 PERMIT Req. Mon. Req. Mon. MGD •*"••' " ** "" """""` ""'"" Monthly INSTAN Effluent Gross REQUIREMENT 300A AVG DAILY MX Solids, total dissolved SAMPLE * " **** *"`•** ••*••• '*•*`« MEASUREMENT 702951 0 PERMIT *`*"* ••**•' "***•• ****•• Req. Mon. Req. Mon. mg /L Quarterly GRAB Effluent Gross REQUIREMENT QRTR AVG DAILY MX NAMEITITLE PRINCIPAL EXECUTIVE OFFICER 1 cartdy, under penalty of lawthat this documerd and all attachments were prepared under mydvechon or TELEPHONE DATE supernamn in acoonlance with a system designed to assure that qualRled personnel property gather and eiraluate the information submitted. Based on my Inquiry of the person or persona wbo manage Me t tk o h-3 system, or those persons directly responaibie for gathermg the Information, the mformatton submitted s, (A qq Lett to the bast of my es for ub and Dials true, accurate, and complete I am aware that there are srgnmcam pena�ea for submtttlng false Information. Including the possibility of Me and onprisommerd for SIGNATURE OF PRI IPAL EXECUTIVE OFFICER OR '^9 TYPED OR PRINTED tovmq Wolabors. AUTHORIZED AGENT ARFA Code NUMBER MMIDD/YYYY COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR — 10YR,24HR PRECIP EVENT;SETTLEABLE SOLIDS LIMIT MAY BE WAIVED FOR >10YR,24HR EVENT -SEE IA.1,PP 4-5, AND I.A.2, P. 5 FOR RQMNTS.TDS MONITORING -SEE PART VIA.2.G OF RATIONALE. 30 DAY AVG. IS HIGHEST MONTHLY AVG. DURING PERIOD REPRTD. EPA Form 3320 -1 (Rev.01106) Previous editions may be used. 10/17/2013 Page 1