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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) C00000132 019-A PERMIT NUMBER DISCHARGE NUMBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 09/01/2015 09/30/2015 Form Approved OMB No. 2040-0004 DMR Mailing ZIP CODE: 81424-0535 MINOR GUNIS SURFACE RUNOFF TO HUBBARD CRK External Outfall No Discharge 00 NAME/TITLE PRINCIPAL EXECUTIVE OFFICER Icertifyunderpenaltyoflawthatthisdocumentandallattachmentswerepreparedundermydirect—or QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE **.... ....•• «.«••« ARFJ Code NUMBER ...... MEASUREMENT 0040010 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 MX 7D AV Solids, settleable SAMPLE *'*`** ****'* ~**`~` ~*~~*_ MEASUREMENT 005451 0 PERMIT `***'~ *~"" `.... "•"' Req. Mon. Req. Mon. rl 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 50050 1 0 PERMIT Req. Mon. Req. Mon. MGD '**`*' "'•*' *"*" "`**• Monthly INSTAN Effluent Gross REQUIREMENT 30DA AVG DAILY MX Solids, total dissolved SAMPLE '_«"' ~****` ~*** **•'*` MEASUREMENT 702951 0 PERMIT ****** •'••** ****** *****• Req. Mon. Req. Mon. mg/L Quarterly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX NAME/TITLE PRINCIPAL EXECUTIVE OFFICER Icertifyunderpenaltyoflawthatthisdocumentandallattachmentswerepreparedundermydirect—or 1 TELEPHONE DATE in accordance with a system designed i to assure that son or personnel properly gather and —aluale the valuate the in/ormahon submitted. Based on my inquiry of the person or persons wfio manage the system, or those persons directly responsible for gathering the information, the information submitted is,rill t t% 16 C-) I-e-,1de K to the best o1 my knowledge and belief, true. accurate, and complete. I am aware that there are significant penarcies for submitting false information including the possibility of fine and imprisonment for SIGNATURE OF P RINCIPAL EXECUTIVE OFFICER OR nowng violation. AUTHORIZED AGENT TYPED OR PRINTED ARFJ Code NUMBER I MMIDDIYYYY� COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR < 10,24HR 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 REPORTING PERIOD. EPA Form 3320-1 (Rev.01106) Previous editions may be used. 10/17/2013 Page 1 s