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PERMITTEE NAME/ADDRESS (lndude Faciity 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) 000000132 016 -A PERMIT M ER DISCHARGE N MBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 03101/2015 03131/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SURFACE RUNOFF TO ELK CREEK External Outfall No Discharge NAME/TITLE PRINCIPAL EXECUTIVE OFFICER 1 carob under penally of law that this doc mend and ao atachmwft were prepared under mydrechon or TELEPHONE DATE supeMamn m accordance with a system designed to assure that qualified personnel property gather and /, /1 A . ♦ r eitaluatethemla rmatlon submitted. Based an my inquiry of the person or persona who manage the G Jr� � /,(,rT Iy It ` lA 0 ki system, or those persons directly responsible for gathering the information, the mformation submitted s. �� to the best of my knowledge and belief. true. accurate, and complete 1 am aware that there are srgnigcant penalties for submitting false Information. mclWirg the possibility of nne and imprisonment for SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED nowrg Vw1aharm AUTHORIZED AGENT anEncode I NUMBER MM/DD/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 RQMNTS. 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. 10117/2013 Page 1 QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE MEASUREMENT 004001 0 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 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 702951 0 PERMIT ****** **"" * * **'* *"'** Req. Mon. Req. Mon. mg /L Quarterly GRAB Effluent Gross REQUIREMENT QRTR AVG DAILY MX NAME/TITLE PRINCIPAL EXECUTIVE OFFICER 1 carob under penally of law that this doc mend and ao atachmwft were prepared under mydrechon or TELEPHONE DATE supeMamn m accordance with a system designed to assure that qualified personnel property gather and /, /1 A . ♦ r eitaluatethemla rmatlon submitted. Based an my inquiry of the person or persona who manage the G Jr� � /,(,rT Iy It ` lA 0 ki system, or those persons directly responsible for gathering the information, the mformation submitted s. �� to the best of my knowledge and belief. true. accurate, and complete 1 am aware that there are srgnigcant penalties for submitting false Information. mclWirg the possibility of nne and imprisonment for SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED nowrg Vw1aharm AUTHORIZED AGENT anEncode I NUMBER MM/DD/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 RQMNTS. 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. 10117/2013 Page 1