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PERMITTEE NAME/ADDRESS (Include Facility Name /LocationifDifferent) 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 010 -A PER IT R I DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 03101/2015 03/31/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SEDIMENT POND TO SANBORN CREEK External Outfall No Discharge PARAMETER QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. EX FREQUENCY OF ANALYSIS SAMPLE TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE *•«* ** * *w..+ •*+ "�: w•.. K 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 0054510 PERMIT ««'••« '*" *'« "` * *` *'*"' Req. Mon. Req. Mon. mUL Monthly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX Iron, total [as Fe) SAMPLE MEASUREMENT 0104510 PERMIT * **" *• •**• ** ««"'"" «*""' 3500 7000 ug /L Monthly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX Oil and grease SAMPLE «* "` " `«* """ `••*"` "`*""` MEASUREMENT 035821 0 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 Solids, total dissolved SAMPLE "`* ««•*`" """` """ MEASUREMENT 7029510 PERMIT '•"`• • * *`•` " "'" `*`•" Req. Mon. Req. Mon. mg /L Quarterly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX 14AMEMTLE PRINCIPAL EXECUTIVE OFFICER 1—W under penally of lawthat thin document and ail attachments were prepared under my direction or TELEPHONE DATE supenrsion in accordance with a system designed to assure that qualified personnel properly gather and �� 1 aluate Me information submitted Based on my inquiry of the person or person who manage the I!N.t liJ• �l ! q 1 r r to d K/ system or those persona directly responsible for gathering the information, the information aubmiRetl m. to the best of my knowledge and belief true, accurate, and complete. I am aware that there are 9701,24 ,5 OV 6 K �) sgmficant penalties for submitthag fame information invading the possidilty of fine and imprsonmem for SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED - womtions; AUTHORIZED AGENT AREA Code I NUMBER MMlDO/YYYY COMMENTS AND EXPLANATION OF ANY VIOLATIONS (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.011061 Previous editions may be used. 10/1712013 Page 1