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PERMITTEE NAME/ADDRESS (Include Facility NameiLocatlon 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 019-A PERMIT NUMBER DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 10/01/2015 1 1 10/3112015 Form Approved OMB No. 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SURFACE RUNOFF TO HUBBARD CRK External Outfall No Discharge NAMEITITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of lawthat this document and all attachments were prepared under my direction or supervision in accordance With 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 to the best of my knowiedge and belief true, accurate, and complete I am aware that there are sgmficant penalties for submitting false information including the possibility of fine and imprisonment for QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER SIGNATURE OF P NCIPAL 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 MX 7D AV Solids, settleable SAMPLE *`*•*` ""**** ****"* ***•*` MEASUREMENT 005451 0 PERMIT **`*`* ~**`** ****** ****** Req. Mon. Req. Mon. mL/L 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 plat SAMPLE MEASUREMENT 50050 1 0 PERMIT Req. Mon. Req. Mon. MGD *****' ****** ****** **'*" Monthly INSTAN Effluent Gross REQUIREMENT 30DA AVG DAILY MX Oil and grease visual SAMPLE ****** **~•** **'**' ****** *"**** MEASUREMENT 84066 1 0 PERMIT **~*•* Req. Mon. Y=1;N=0 ***'*' *****~ ****"* ****** Monthly VISUAL Effluent Gross REQUIREMENT INST MAX NAMEITITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of lawthat this document and all attachments were prepared under my direction or supervision in accordance With 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 to the best of my knowiedge and belief true, accurate, and complete I am aware that there are sgmficant penalties for submitting false information including the possibility of fine and imprisonment for \ � TELEPHONE DATE {� � r 7; GL{ `'JU (�4j y! ! / J % G u/ SIGNATURE OF P NCIPAL EXECUTIVE OFFICER OR now gviolaunns AUTHORIZED AGENT TYPED OR PRINTED AREACode NUMBER MMIDD/riYY 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 REPORTING PERIOD. EPA Form 3320-1 (Rev.01106) Previous editions may be used. 10/17/2013 Page 1