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PERMITTEE NAME/ADDRESS ( InGude 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) C00000132 014 -A PERMIT NUMBER I I DI HARG NUMB R MONITORING PERIOD MM /DDIYYYY MM /DD/YYYY 04/01/2015 04/30/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SURF RUNOFF TO N FK GUNNISON R External Outfall No Discharge NAME /TITLE PRINCIPAL EXECUTIVE OFFICER I ceuty under penalty of law that this document and all attachments v ,e prepared under my direction or TELEPHONE DATE supervision in accordance wth a system designed to assure that qualfed personnel property gather and valuate the information submitted. Based on my inquiry of the person of persons who manage the ' Iv' 1 �J..,r, \ Y p w system, or those persons directly responsible for gathering the information, the information submitted is, �(J to the best of my knowledge and beliel, We, accurate, and complete I am aware that Mere are 12o .�Qf�I ^Cf(() 6 0 j' Dy -�/ sgnduantpenaltiestarsuhmntingfalseInformabon, includingtheposribddyoffineardimprisonmentfor IGNATUREOFPRINCIPALEXECUTIVEOFFICEROR ! �(�/ JV 1 TYPED OR PRINTED nowmg miatlons. AUTHORIZED AGENT AREACode I NUMBER MMIDD/YYYy COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR I 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.01 106) 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 MEASUREMENT 0040010 PERMIT ~ ~~ « ~ ~" « ~ ~* 6.5 " ~ «' g 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 Oil and grease visual SAMPLE MEASUREMENT 8406610 PERMIT * * ~~ Req. Mon. Y =1;N =0 '* * *` """ ""* * ""' Monthly VISUAL Effluent Gross REQUIREMENT INST MAX NAME /TITLE PRINCIPAL EXECUTIVE OFFICER I ceuty under penalty of law that this document and all attachments v ,e prepared under my direction or TELEPHONE DATE supervision in accordance wth a system designed to assure that qualfed personnel property gather and valuate the information submitted. Based on my inquiry of the person of persons who manage the ' Iv' 1 �J..,r, \ Y p w system, or those persons directly responsible for gathering the information, the information submitted is, �(J to the best of my knowledge and beliel, We, accurate, and complete I am aware that Mere are 12o .�Qf�I ^Cf(() 6 0 j' Dy -�/ sgnduantpenaltiestarsuhmntingfalseInformabon, includingtheposribddyoffineardimprisonmentfor IGNATUREOFPRINCIPALEXECUTIVEOFFICEROR ! �(�/ JV 1 TYPED OR PRINTED nowmg miatlons. AUTHORIZED AGENT AREACode I NUMBER MMIDD/YYYy COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR I 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.01 106) Previous editions may be used. 10/17/2013 Page 1