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PERMITTEE NAME/ADDRESS (Include Facility Name/Location if Different) NAME: Oxbow Mining LLC ADDRESS: PO Box 535 Somerset, CO 81434-0535 FACILITY: SANBORN CRK 8t 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 MM/DD/YYYY MM/DD/YYYY 09/01/2015 09/30/2015 Form Approved OMB No. 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SEDIMENT POND TO ELK CREEK External Outfall No Discharge I NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel property gather and valuate the information 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 significant penalties for submitting false information. including the possibility of rine and imprisonment for QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER SIGNATURE OF PRINtIPAL EXECUTIVE OFFICER OR 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 00545 1 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 Solids, total dissolved SAMPLE `•"*` ****«* •**•" '*'~** MEASUREMENT 702951 0 PERMIT =•"'• ****** `***** *_"•' Req. Mon. Req. Mon. mg/L Quarterly GRAB Effluent Gross REQUIREMENT QRTR AVG DAILY MX NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel property gather and valuate the information 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 significant penalties for submitting false information. including the possibility of rine and imprisonment for i r' I r TELEPHONE DATE L� Q 41 i ( SIGNATURE OF PRINtIPAL EXECUTIVE OFFICER OR vowing violations. AUTHORIZED AGENT TYPED OR PRINTED AREACode I NUMBER MMIDDIYYYY 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; S ETTLEAB LE 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.01/06) Previous editions may be used. 10/17/2013 Page 1