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PERMITTEE NAMEIADDRESS (include Facility NamelLocation if Different) 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 (NPDES) DISCHARGE MONITORING REPORT (DMR) 000000132 I 019 -A PERMIT NUMBER I I DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 02101/2014 02/28/2014 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SURFACE RUNOFF TO HUBBARD CRK External Outtall r No Discharge COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR — 10,24HR PRECIP EVENT;SETTLEABLE SOLIDS LIMIT MAY BE WAIVED FOR >10YR.24HR EVENT -SEE I.A.1,PP 4-5, AND IA.2, P 5 FOR RQMNTS.TDS MONITORING -SEE PART VI.A.2.G OF RATIONALE. 30 DAY AVG IS HIGHEST MONTHLY AVG DURING REPORTING PERIOD. EPA Form 33204 (Rev.01 /06) Previous editions may be used. 10117/2013 Page 1 4 QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE MEASUREMENT 0040010 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 MX 7D AV 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 500501 0 PERMIT Req. Mon. Req. Mon. MGD "*`" `**'*` *"*`• '*"" Monthly INSTAN Effluent Gross REQUIREMENT 30DA AVG DAILY MX Oil and grease visual SAMPLE **"'* •*`• *• *****` *•*' ** *'*`•' MEASUREMENT 840661 0 PERMIT •*`*** Req. Mon. Y =1;N =0 •"` *• '*"** ****`* `•*•'• Monthly VISUAL Effluent Gross REQUIREMENT INST MAX COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR — 10,24HR PRECIP EVENT;SETTLEABLE SOLIDS LIMIT MAY BE WAIVED FOR >10YR.24HR EVENT -SEE I.A.1,PP 4-5, AND IA.2, P 5 FOR RQMNTS.TDS MONITORING -SEE PART VI.A.2.G OF RATIONALE. 30 DAY AVG IS HIGHEST MONTHLY AVG DURING REPORTING PERIOD. EPA Form 33204 (Rev.01 /06) Previous editions may be used. 10117/2013 Page 1 4