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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) 000000132 019 -A PERMIT NUMBER DISCHARGE NUMB R MONITORING PERIOD MM /DD/YYYY MM /DD/YYYY 04/01/2015 04/30/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SURFACE RUNOFF TO HUBBARD CRK External Outfall No Discharge NAMEMTLE PRINCIPAL EXECUTIVE OFFICER lcer Utyunderpenalty oflawthattMStlocumentandallattachmentswrepreparedundermydirectionor TELEPHONE DATE supervision in accordance w+th a system designed to assure that qualified personnel property gather and aluate the information submitted Based on my inquiry of the person or persons who manage the h,,,flj /Y�. / r -'�JZ ♦ i "P (1 D system, or those persons directly responsible for gathering the information, the mformabon submitted rs. MM�n to the best of my kedge and belief, true. accurate, and complete. I am aware that there are �7A ^QrJO C�QO 6 OS d y `�� significant penalties forsubmRhngfalseinf ormation. Includingthepossibilityoffineandimpnsonment1 SIGNATUREOF PRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED noWngviolations. AUTHORIZED AGENT AR -Code I NUMBER MMID IYYYY 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.01 /06) Previous editions may be used. 10117/2013 Page 1 QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS -HYPE 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 0054510 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 5005010 PERMIT Req. Mon. Req. Mon. MGD '** "` "*"*" """ '"'*** Monthly INSTAN Effluent Gross REQUIREMENT 30DA AVG DAILY MX Oil and grease visual SAMPLE * * * * ** "" *` ' * "" "• *" "*"• " MEASUREMENT 8406610 PERMIT ** * *** Req. Mon. Y =1;N =0 ***"* ` ****' """ *`** * Monthly VISUAL Effluent Gross REQUIREMENT INST MAX NAMEMTLE PRINCIPAL EXECUTIVE OFFICER lcer Utyunderpenalty oflawthattMStlocumentandallattachmentswrepreparedundermydirectionor TELEPHONE DATE supervision in accordance w+th a system designed to assure that qualified personnel property gather and aluate the information submitted Based on my inquiry of the person or persons who manage the h,,,flj /Y�. / r -'�JZ ♦ i "P (1 D system, or those persons directly responsible for gathering the information, the mformabon submitted rs. MM�n to the best of my kedge and belief, true. accurate, and complete. I am aware that there are �7A ^QrJO C�QO 6 OS d y `�� significant penalties forsubmRhngfalseinf ormation. Includingthepossibilityoffineandimpnsonment1 SIGNATUREOF PRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED noWngviolations. AUTHORIZED AGENT AR -Code I NUMBER MMID IYYYY 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.01 /06) Previous editions may be used. 10117/2013 Page 1