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PERMITTEE NAME/ADDRESS (Include Facility Name/LocationftDrflerent) 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 016-A PERMIT NUMBER DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 08/01/2015 08/31/2015 Form Approved OMB No 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SURFACE RUNOFF TO ELK CREEK External Outfall No Discharge r NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments were prepared under my direction or QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OFANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE ...... .....* *..... ...... MEASUREMENT 004001 0 PERMIT ••••*~ ****`" *«"** 6.5 •***** g 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 Oiland 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 NAME/TITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments were prepared under my direction or TELEPHONE DATE supervision in accordance wnlh a system designed to assure that qualified personnel properly 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 ,( t t L �- / --n 1 tt" Gf (IL to the best of my knowledge and belief true, accurate and complete I am aware that there are significant penalties far submitting false information including the possibility of fine and imprisonment for now�rg—lat'cna G �- IGNATURE OF PRINCJOAL EXECUTIVE OFFICER OR�,C AUTHORIZED AGENT TYPED OR PRINTED AREA Code I NUMBER MID /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,24 HR PRECIP EVENT;SETTLEABLE SOLIDS LIMITS 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 PERIOD RPTD. EPA Form 3320-1 (Rev.01/06) Previous editions may be used. 10/17/2013 Page 1