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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 007 -A PERMI R DISCHARG NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 03/0112015 03/31/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SEDIMENT POND TO HUBBARD CREEK External Outfall No Discharge I V NAME /TITLE PRINCIPAL EXECUTIVE OFFICER 1os" Under penalty oflewthat this document and all attachments were prepared unde rmymrect, -or `� TELEPHONE DATE supervision in accordance with a system designed to assure that quaiifled pera innel property gather and IP /� 1k A / uate the mfornimn submitted Baeed on my inquiry of the person or persons who manage the fv � \ L.. Q4i system or those persons directly responsible for gathering the information, the information aubrn$[ed is AA to the best of my knoydedge and belief true accurate, and complete 1 am aware that there are T 7Q —g69 — Sa 6 v 7 Q sgmflcant penalties for submitting false information 1WWing the possWftofMea rd Imprisonment for SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR 11 wowo"s AUTHORIZED AGENT TYPED OR PRINTED AREA�a NUMBER MMIDDNM COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR <= 10YR,24HR 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 QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE ww:,wr ww:www w*.ww: w "www 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 0358210 PERMIT """""' ****•• ""•** """ """'*' 10 mg/L Contingent GRAB Effluent Gross REQUIREMENT INST MAX Flow, in conduit or thru treatment plat SAMPLE '•••"" ***"** *"***" """' "• MEASUREMENT 5005010 PERMIT Req. Mon. Req. Mon. MGD '"'••• "'"•*' ••*••' '""""" Monthly INSTAN Effluent Gross REQUIREMENT 300A AVG DAILY MX Solids, total dissolved SAMPLE * *•• *• *""•*• ""**"* •"'*" MEASUREMENT 702951 0 PERMIT "**"" ••'•"• ""***• **•••' Req. Mon. Req. Mon. mg /L Quarterly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX NAME /TITLE PRINCIPAL EXECUTIVE OFFICER 1os" Under penalty oflewthat this document and all attachments were prepared unde rmymrect, -or `� TELEPHONE DATE supervision in accordance with a system designed to assure that quaiifled pera innel property gather and IP /� 1k A / uate the mfornimn submitted Baeed on my inquiry of the person or persons who manage the fv � \ L.. Q4i system or those persons directly responsible for gathering the information, the information aubrn$[ed is AA to the best of my knoydedge and belief true accurate, and complete 1 am aware that there are T 7Q —g69 — Sa 6 v 7 Q sgmflcant penalties for submitting false information 1WWing the possWftofMea rd Imprisonment for SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR 11 wowo"s AUTHORIZED AGENT TYPED OR PRINTED AREA�a NUMBER MMIDDNM COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR <= 10YR,24HR 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