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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 013-A PERMIT NUMBER DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY F MM/DD/YYYY 08/01/2015 1 08/31/2015 Form Approved OMB No 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS RUNOFF TO N FORK GUNN15ON R. External Outfall No Discharge NAMEITITLE PRINCIPAL EXECUTIVE OFFICER Z \ �?' �,..(, { C I�• Lam.-' r 051 , j , Y I certify under penally of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and valuate the information submitted Based on my inquiryof the person or persons who manage the system or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief true accurate, and complete I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonment for nowang violattons QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER TYPED OR PRINTED EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pHSAMPLE «..... ..« MEASUREMENT 0040010 Effluent Gross PERMIT REQUIREMENT "**** "**** "'*** 6.5 MINIMUM "'*** 9 MAXIMUM SU Monthly INSITU Solids, total suspended SAMPLE ****** **"*' ****** *****• MEASUREMENT 0053010 Effluent Gross PERMIT REQUIREMENT ****** ****'* ****** '***** 35 30DA AVG 70 DAILY MX mg/L Monthly GRAB Solids, settleable SAMPLE MEASUREMENT 005451 0 Effluent Gross PERMIT REQUIREMENT '***** ***'** *****' ***'** Req. Mon. 30DA AVG Req. Mon. DAILY MX mUL Monthly GRAB Iron, total [as Fe] SAMPLE ****** **'*" ****** -****• MEASUREMENT 0104510 Effluent Gross PERMIT REQUIREMENT *****' ""'* ***'** **'*" 3000 30DA AVG 6000 DAILY MX ug/L Monthly GRAB Oiland grease SAMPLE ****** "**'* ****** *•**«* *•••** MEASUREMENT 0358210 Effluent Gross PERMIT REQUIREMENT *****' '***** ****** ****'* ****** 10 INST MAX mg/L Contingent GRAB Flow, in conduit or thru treatment plat SAMPLE MEASUREMENT 500501 0 Effluent Gross PERMIT REQUIREMENT Req. Mon. 30DA AVG Req. Mon. DAILY MX MGD *"'** ****" *'**** '***** Monthly INSTAN Oil and grease visual SAMPLE ***'*' ****•• •*<••• ****** *.*.*. MEASUREMENT 840661 0 Effluent Gross PERMIT REQUIREMENT '*'*** Req. Mon. INST MAX Y=1;N=0 **'*" '***** **'*** "*'** Monthly VISUAL NAMEITITLE PRINCIPAL EXECUTIVE OFFICER Z \ �?' �,..(, { C I�• Lam.-' r 051 , j , Y I certify under penally of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and valuate the information submitted Based on my inquiryof the person or persons who manage the system or those persons directly responsible for gathering the information, the information submitted is to the best of my knowledge and belief true accurate, and complete I am aware that there are significant penalties for submitting false information including the possibility of fine and imprisonment for nowang violattons / n y (rYl/ (� , t r 4��9 '�'•Z + r r f TELEPHONE DATE / SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR AUTHORIZED AGENT TYPED OR PRINTED AR -C-. I NUMBER MMIDDIYYYY cVMMtN 15 ANU tAFLANA IIUN 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