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PERMITTEE NAME/ADDRESS (Include 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 (NPDES) DISCHARGE MONITORING REPORT (DMR) C00000132 I 013 -A PERMIT NUMBER I DISCHARGE NUMBER MONITORING PERIOD MM /DD/YYYY MM /DD/YYYY 04/01/2015 04/30/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS RUNOFF TO N FORK GUNNISON R. External Outfall No Discharge NAME /TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments vvere pre pared under my direction or TELEPHONE DATE supervision in accordance win a system desgned to assure that qualified personnel property gather arN A � ` '/— 0 valuate the mformabon submitted. Based on my inquiry of the person or persons who manage the all r � _? system, or those' hose persons directly responsible for gathering the mfofmatron, the mformatron submdted s. `�f r l ' �� I Q S � /- to me best of my knowledge and belief. true. accurate, and complete. I am aveare that there are i' J Y0 t e.5(4vc�- sgnificantpenaltesfor submdbng false Information. including the possibility of fine and Imprisonment for IGNATUREOF PRINCIPAL EXECUTIVE OFFICER OR 05d`t �� "O"'n9vi l lions• AUTHORIZED AGENT TYPED OR PRINTED AREaCOde NUMBER MM/DDffM COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR 1 PRECIP EVENT;SETTLEABLE SOLIDS LIMIT MAY BE WAIVED FOR >10YR,24HR EVENT -SEE I.A.1,PP 4 -5, AND I.A.2, P. 5 FOR RQMNTS.TDS MONITORING -SEE PART VI.A.2.G OF RATIONALE. 30 DAY AVG. IS HIGHEST MONTHLY AVG. DURING PERIOD REPRTD. EPA Form 3320 -1 (Rev.01 106) Previous editions may be used. 10/17/2013 Page 1 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 DAILY MX Solids, settleable SAMPLE "«* * *" * *•*** *** * ** `*«*** MEASUREMENT 0054510 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 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 NAME /TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments vvere pre pared under my direction or TELEPHONE DATE supervision in accordance win a system desgned to assure that qualified personnel property gather arN A � ` '/— 0 valuate the mformabon submitted. Based on my inquiry of the person or persons who manage the all r � _? system, or those' hose persons directly responsible for gathering the mfofmatron, the mformatron submdted s. `�f r l ' �� I Q S � /- to me best of my knowledge and belief. true. accurate, and complete. I am aveare that there are i' J Y0 t e.5(4vc�- sgnificantpenaltesfor submdbng false Information. including the possibility of fine and Imprisonment for IGNATUREOF PRINCIPAL EXECUTIVE OFFICER OR 05d`t �� "O"'n9vi l lions• AUTHORIZED AGENT TYPED OR PRINTED AREaCOde NUMBER MM/DDffM COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR 1 PRECIP EVENT;SETTLEABLE SOLIDS LIMIT MAY BE WAIVED FOR >10YR,24HR EVENT -SEE I.A.1,PP 4 -5, AND I.A.2, P. 5 FOR RQMNTS.TDS MONITORING -SEE PART VI.A.2.G OF RATIONALE. 30 DAY AVG. IS HIGHEST MONTHLY AVG. DURING PERIOD REPRTD. EPA Form 3320 -1 (Rev.01 106) Previous editions may be used. 10/17/2013 Page 1