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PERMITTEE NAME/ADDRESS (Include FacilityName/Location 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 012 -A PERMIT NUMBER DISCHARGE NUMBER MONITORING PERIOD MMIDD/YYYY MM /DDIYYYY 04/01/2015 04/30/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SEDIMENT POND TO ELK CREEK External Outfall No Discharge �4 NAMEITITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments v re prepared under my direction or I, /� TELEPHONE DATE supervision in accordance with a system designed to assure that quaiRed personnel property gather and valuate the information submitted. Based on my inquiry of the person or persons who manage the Iti O system, or arose persons directly responsible for gathering the Information, the informalon submdted is, to the best of my knowledge and belief true. accurate, and complete. I am aware that there are significant penalties for submnung false information. Including the possibility of fine and Imprisonment l r SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED knovAng AUTHORIZED AGENT AREA COde NUMBER MM/DD/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 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.01106) 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 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 NAMEITITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments v re prepared under my direction or I, /� TELEPHONE DATE supervision in accordance with a system designed to assure that quaiRed personnel property gather and valuate the information submitted. Based on my inquiry of the person or persons who manage the Iti O system, or arose persons directly responsible for gathering the Information, the informalon submdted is, to the best of my knowledge and belief true. accurate, and complete. I am aware that there are significant penalties for submnung false information. Including the possibility of fine and Imprisonment l r SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED knovAng AUTHORIZED AGENT AREA COde NUMBER MM/DD/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 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.01106) Previous editions may be used. _ 10/17/2013 • Page 1