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PERMITTEE NAME/ADDRESS (Include Facility NamelLocation if Different) NAME: Oxbow Mining LLC ADDRESS: PO Box 535 Somerset, CO 81434-0535 FACILITY: SANBORN GRK & 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 019-A PERMIT NUMBE DISCHARGE NUMBER MONITORING PERIOD _ MM/DD/YYYY MM/DD/YYYY 07/01/2015 07/31/2015 Form Approved OMB No. 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SURFACE RUNOFF TO HUBBARD CRK External Outfall tom, No Discharge NAME/TITLE PRINCIPAL EXECUTIVE OFFICER - _ I certify under penally of law that this document and all attachments were prepared under my duection or supervision in accordance with a system designed to assure that qualified personnel properly gather and valuate the mformallon submitted Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief true accurate and complete I am aware that there are sigmhcantpenalties for submrtangfalse Information including the p—bliltyoffine and imprisonment for knowing violations QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER TYPED OR PRINTED EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE .....+ +++++. ...... 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 MX 71D 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 pla it 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 NAME/TITLE PRINCIPAL EXECUTIVE OFFICER - _ I certify under penally of law that this document and all attachments were prepared under my duection or supervision in accordance with a system designed to assure that qualified personnel properly gather and valuate the mformallon submitted Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief true accurate and complete I am aware that there are sigmhcantpenalties for submrtangfalse Information including the p—bliltyoffine and imprisonment for knowing violations ( / t r ✓ �, '' alt I • ��'y r (� r �., TELEPHONE DATE 7 , OIGNATUREOFPRINCIRA EXECUTIVE OFFICER OR AUTHORIZEDAGENT TYPED OR PRINTED ARFA Code NUMBER IDp/YYYY 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 I.A.2, P 5 FOR ROMNTS.TDS MONITORING -SEE PART VI.A.2.G OF RATIONALE. 30 DAY AVG IS HIGHEST MONTHLY AVG DURING REPORTING PERIOD. EPA Form 3320-1 (Rev.01/06) Previous editions may be used. 10/17/2013 Page 1