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NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) <br />DISCHARGE MONITORING REPORT (DMR) <br />PERMITTEE NAME/ADDRESS (Include Facility Namekocation if Different) <br />x NAME: Oxbow Mining LLC <br />ADDRESS: PO Box 535 <br />Somerset, CO 81434-0535 <br />h FACILITY: SANBORN CRK & ELK CRK MINES <br />LOCATION: 3737 HIGHWAY 133 <br />s SOMERSET, CO 81434 <br />ATTN: James T. Cooper, EVP <br />i <br />000000132 007-A <br />PERMIT NUMBER DISCHARGE NUMBER <br />MONITORING PERIOD <br />MM/DD/YYYY MM/DD/YYYY <br />FROM 05/01/2011 TO 05/31/2011 <br />PARAMETER QUANTITY OR LOADING QUALITY OR CONC <br /> VALUE VALUE UNITS VALUE VALUE <br />pH SAMPLE «., <br />•• <br /> MEASUREMENT «»" `»«' •'•»• <br />0040010 <br /> <br />Effluent Gross PERMIT --- <br />6.5 <br /> <br />...... <br /> REQUIREMENT MINI <br />MUM <br />Solids, total suspended SAMPLE <br /> <br />MEASUREMENT ,,,,• <br />0053010 <br /> PERMIT <br />-»•• <br />Effluent Gross REQUIREMENT 30DA AVG <br />Solids, settleable SAMPLE <br />• « <br /> MEASUREMENT «»» '«»' """ <br />0054510 <br /> PERMIT """ •' • '» <br /> <br />Effluent Gross <br />REQUIREMENT R. Mon. <br />30DA AVG <br />Iron, total (as Fe) SAMPLE ,,,•» <br /> MEASUREMENT <br />0104510 <br /> PERMIT <br />•»? <br />Effluent Gross REQUIREMENT 30DAAVG <br />Oil and grease SAMPLE , <br />»•» <br /> MEASUREMENT »«" ""'• """ •••»• <br />0358210 <br /> PERMIT """ ••*•-• <br />••••» <br />•» <br />Effluent Gross REQUIREMENT <br />Flow, in conduit or thru treatment plant SAMPLE <br /> MEASUREMENT """ ••••» <br />500501 0 <br /> <br />Effluent Gross PERMIT Req. Mon. Req:.Mon. MgaUd •`?•» <br /> REQUIREMENT 30DA AVG DAILY MX <br />Oil and grease visual SAMPLE <br /> MEASUREMENT • » '••"' •••• - <br />84066 1 0 <br /> <br />Effluent Gross PERMIT •""• Req. Mon. Y=1;N=0 <br /> REQUIREMENT INST MAX Form Approved <br />OMB No. 2040-0004 <br />DMR Mailing ZIP CODE: 81424-0535 <br />MINOR <br />GUNIS <br />SEDIMENT POND TO HUBBARD CREEK <br />External Outfall <br />No Discharge <br />ENTRATION NO. FREQUENCY SAMPLE <br />EX OF ANALYSIS TYPE <br />VALUE UNITS <br />9 SU <br />MAXIMUM Monthly INSITU <br />70 mg/L <br />DAILY MX Monthly GRAB <br />Req. Mon, mL/L <br />DAILY MX Monthly GRAB <br />DAILY MX I I I Monthly I GRAB <br />INST MAX - I I Contingent GRAB <br />Monthly ( INSTAN <br />...... I .-.- <br />Monthly VISUAL <br />AME/i1TLEPR CI AL EXECUTIVE OFFICER "[-nfY CtPep'i'yofia"'w'm°dmu,,-,,-d,uameh-1n*a,ePrep,rean? ,nyditwian? <br />cwtwt rthinx:coNancew ith nhasysrcmdesignewassortthuqualifiedpersanrxPe,ygat,e and TELEPHONE DATE <br />u nt iro <br />! e.aiuate nc? in( rn td wi. &usd on , irpiry <br />the personrar Pawns ge We <br />system, a Dose pawns dirtnly tcsponsibk fw gadrering the inf uo4 the intormatioo subminad is. A <br />cc.. - a?eba,nfmywn.k Ya?behetwe. une.anda?Pke.iam. e?a e?.ignifi nr y ?s 79 S ZZ ,07 ?/ <br />rCl pemlua fm wbmining f infomwion, including the possibiliy of Cure W imptiwntneor fm kmraing I ?d 4 r? ? D? <br />N, TYPED OR PRINTED ,o6nan. A• R OR <br />AUT R AGENT Anew Cod* NUMBER MWDDIYYYY <br />COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) <br />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 <br /> I.A.2, P. 5 <br />FOR RQMNTS.TDS MONITORING-SEE PART VI.A2.G OF RATIONALE. 30 DAY AVG. IS HIGHEST MONTHLY AVG. DURING PERIOD REPRTD. <br />EPA Form 3320-1 (Rev.01106) Previous editions may be used. <br />Page 1 <br />i