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PERMITTEE NAME/ADDRESS (Include 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 I 007-A PERMIT NUMBER I I DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MMIDDIYYYY 05/01/2015 05/31/2015 Form Approved OMB No. 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SEDIMENT POND TO HUBBARD CREEK External Outfall �[ No Discharge 1( ] NAMEITITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualdied personnel property gather and valuate the information submitted Based on my Inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the Information, the information submdled is, QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS -HYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE ...... ....«. ****.. .....* MEASUREMENT 004001 0 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 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 ****** •***"* *•**"* *****" 3500 7000 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 NAMEITITLE PRINCIPAL EXECUTIVE OFFICER I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualdied personnel property gather and valuate the information submitted Based on my Inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the Information, the information submdled is, �`,.�._ • • % r/yv"' `" / r TELEPHONE DATE Y\lkt i (� v C I 5 to the best of my knowledge and belief true, accurate, and complete I am aware that there are sgnificant penalties for submitting false Information, Including the possibility of fine and Imprisonment fo 97�%-9Ly - S�Q 6 O 6 o ZO SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR nowmg violations AUTHORIZED AGENT TYPED OR PRINTED nRen coca NUMBER MMroD/YYYY 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 ROMNTS.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.01/06) Previous editions may be used. 10/17/2013 Page 1 S