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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 & 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 010-A PERMIT NUMBER DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 08/01/2015 1 08/31/2015 Form Approved OMB No 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SEDIMENT POND TO SANBORN GREEK External Outfall No Discharge I NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of lawthat this document and all attachments were prepared under my direction or QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER VALUE VALUE UNITS VALUE VALUE VALUE UNITS EX OF ANALYSIS TYPE pHSAMPLE ++++++ ++++++ ++++++ MMJDD ++++++ MEASUREMENT 0040010 PERMIT *+*"`" *"*"* *•`*•` 6.5 ***•"* g SU Monthly INSITU Effluent Gross REQUIREMENT MINIMUM MAXIMUM Solids, total suspended SAMPLE **«*** ****** ****** �•*•** MEASUREMENT 0053010 Effluent Gross PERMIT REQUIREMENT *"*'* ****** •***** `*"** 35 30DA AVG 70 DAILY MX mg/L Monthly GRAB Solids, settleable SAMPLE *"***' *'**** *""**` +**•** MEASUREMENT 005451 0 Effluent Gross PERMIT REQUIREMENT `***** ***"** ****"` ***`** Req. Mon. 30DA AVG Req. Mon. DAILY MX mUL Monthly GRAB Iron, total [as Fe] SAMPLE MEASUREMENT 0104510 Effluent Gross PERMIT REQUIREMENT ****** **`**• •*'*** ****** 3500 30DA AVG 7000 DAILY MX ug/L Monthly GRAB Oil and grease SAMPLE ****** ****** ****** *•t****••** MEASUREMENT 0358210 Effluent Gross PERMIT REQUIREMENT *"***" ****«* ****** ****`* •***** 10 INST MAX mg/L Contingent GRAB Flow, in conduit or thru treatment plat 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 84066 1 0 Effluent Gross PERMIT REQUIREMENT Req. Mon. INST MAX Y=1;N=0 `*'*** ***`*' '***** ****** Monthly VISUAL NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of lawthat this document and all attachments were prepared under my direction or TELEPHONE DATE ` supervision in accordance with a system designed to assure that qualified personnel properly gather and valuate the Informallon 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 j ' t ; fl l fl ✓' % / . ;�'1 i kj _ to the best of my knowledge and belief true accurate and complete I am aware that there are r SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR 'AUTHORIZED AGENT r( ick, significant penalties for submitting false information including the possibility of fine and imprisonment for nownng violations TYPED OR PRINTED AR-Cotle NUMBER MMJDD I.UMl1fl LN 15 ANIJ LAYLANA I IUN Ur• ANY VIULA ITUNS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR -11 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 i