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PERMITTEE NAME/ADDRESS (Include Facility Name}Locahon 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 013-A PERMIT NUMBER DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 07/01/2015 1 07/31/2015 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 PRINCIP L EXECUTIVE OFFICER I ceNfy under penalty of law that this document and all attachments were prepared under my direction or superws'on ,n accordance with a system designed to assure that qualified personnel properly gather and QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE •*«.*« «**... *.*..> AREA Code NUMBER .«««.« 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 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 Effluent Gross PERMIT REQUIREMENT Req. Mon. 30DA AVG Req. Mon. DAILY MX MGD ****** ****** ****** ***~** Monthly INSTAN Oil and grease visual SAMPLE MEASUREMENT 840661 0 Effluent Gross PERMIT REQUIREMENT •***** Req. Mon. INST MAX Y=1;N=0 **"`* *"`** ***'** *'***` Monthly VISUAL NAME/TITLE PRINCIP L EXECUTIVE OFFICER I ceNfy under penalty of law that this document and all attachments were prepared under my direction or superws'on ,n accordance with a system designed to assure that qualified personnel properly gather and \ 1 TELEPHONE DATE 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 (� )� , /� �., L C, G✓ t �)i� '{'rte l d. V\t- 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 fine and imprisonment for V. N IGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR nowng violations AUTHORIZED AGENT TYPED OR PRINTED AREA Code NUMBER MMID /YYYY 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.01106) Previous editions may be used. 10/17/2013 Page 1