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PARAMETER certify coder penalrc of that his document and all attachments were preps under m> t in:cuon or ,openist in accordance with a.s. d r „ure that qualified personnel prupedy eam<r and 'alum • th • id n r t sal mm .d L • • my myunr "I'M,. p,r.nn or per,on • who mmuge the directly rc hoe. for g and the information. pl o a m the mfom er wmin ` the h or o persons i b n,d is to . or of m)' knowledge and WO: et. truce as m at te. nd c e e. I io aware e i the that that arc ec penalties fur submitting f3Ise information, m dudmg the po,tbil y of find and unpnsenment for knuwin t QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. EX FREQUENCY OF ANALYSIS SAMPLE TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH 0040010 Effluent Gross SAMPLE MEASUREMENT PERMIT REQUIREMENT 6.5 MINIMUM 9 MAXIMUM SU Monthly INSITU Solids, total suspended 0053010 Effluent Gross SAMPLE MEASUREMENT PERMIT REQUIREMENT "`" 35 30DA AVG 70 DAILY MX mg/L Monthly GRAB Solids, settleable 00545 1 0 Effluent Gross SAMPLE MEASUREMENT PERMIT REQUIREMENT •" "• Req. Mon. 30DA AVG Req. Mon. DAILY MX mL/L Monthly GRAB Iron, total (as Fe) 01045 1 0 Effluent Gross SAMPLE MEASUREMENT PERMIT REQUIREMENT tia », 30DA 3000 AVG DAILY MX ug /L Monthly y RAB Oil and grease 03582 1 0 Effluent Gross SAMPLE MEASUREMENT PERMIT REQUIREMENT INST MAX mg/L Conlin ent 9 GRAB Flow, in conduit or thru treatment plant 50050 1 0 Effluent Gross SAMPLE MEASUREMENT PERMIT REQUIREMENT Req. Mon. 30DA AVG Req. Mon. DAILY MX Mgal /d '•'••• '•" Monthly INSTAN Solids, total dissolved 70295 1 0 Effluent Gross SAMPLE MEASUREMENT PERMIT REQUIREMENT •* • QRTR AVG DAILY mg/L Quarterly y GRAB NAME /TITLE PRINCIPAL EXECUTIVE OFFICER certify coder penalrc of that his document and all attachments were preps under m> t in:cuon or ,openist in accordance with a.s. d r „ure that qualified personnel prupedy eam<r and 'alum • th • id n r t sal mm .d L • • my myunr "I'M,. p,r.nn or per,on • who mmuge the directly rc hoe. for g and the information. pl o a m the mfom er wmin ` the h or o persons i b n,d is to . or of m)' knowledge and WO: et. truce as m at te. nd c e e. I io aware e i the that that arc ec penalties fur submitting f3Ise information, m dudmg the po,tbil y of find and unpnsenment for knuwin t n ) I G I ` �`� e TX l . V • V TELEPHONE DATE Z v 17: / /'- �� J � I ? o -W 6 / J / ! 1 �! J 4V 0' A / �. ' 1/ M DO/YYYY S IGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR AUTHORIZED AGENT AREA Code I NUMBER TYPED OR PRINTED PERMITTEE NAME/ADDRESS (include Facility Name /Location if Different) NAME: Oxbow Mining LLC ADDRESS: PO Box 535 Somerset, CO 81434 -0535 FACILITY: LOCATION: SANBORN CRK & ELK CRK MINES 3737 HIGHWAY 133 SOMERSET, CO 81434 ATTN: James T. Cooper, EVP EPA Form 3320 -1 (Rev.01106) Previous editions may be used. NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) DISCHARGE MONITORING REPORT (DMR) FROM C00000132 PERMIT NUMBER 014 -A DISCHARGE NUMBER MONITORING PERIOD MM /DD/YYYY 06/01/2011 MM /DD/YYYY 06/30/2011 TO 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 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 IA.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. Page 1