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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) 000000132 010 -A PERMIT NUMBER I DISCHARGE UMBER MONITORING PERIOD MMIDD/YYYY MM/DDIYYYY 04/01/2015 04/30/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SEDIMENT POND TO SANBORN CREEK External Outfall No Discharge NAMEITITLE PRINCIPAL EXECUTIVE OFFICER Iced' Nunderpenaltyoflawthatthisdocumentandallattachmentsxerepreparedundermydirectionor TELEPHONE DATE supervision In accordance wth a system designed to assure that qualified personnel property gather and • r 1 k O aluate the Information submitted. Based on my Inquiry of the person or persons who manage the (N✓7 / system, or those persons directly responsible for gathering the information, the information submitted W, /1 C F , to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are g�d • aF a y// s significant penalties for submitting fake information, including the possidldy of fine and imprisonment for SIGNATURE OFPRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED nowing viofatrons. AUTHORIZED AGENT ARFJACode I NUMBER MM/DDNYYY 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 RQMNTS.TDS MONITORING -SEE PART VI.A.2.G OF RATIONALE. 30 DAY AVG. IS HIGHEST MONTHLY AVG. DURING PERIOD REPRTD. EPA Farm 3320 -1 (Rev.01 106) Previous editions may be used. 10/17/2013 Page 1- ' QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. FREQUENCY SAMPLE PARAMETER EX OF ANALYSIS TYPE VALUE VALUE UNITS VALUE VALUE VALUE UNITS pH SAMPLE --- * « " *. ... ".: .....* 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 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 5005010 PERMIT Req. Mon. Req. Mon. MGD " " ** *"' *" ' ** "" • " *"*" Monthly INSTAN Effluent Gross REQUIREMENT 30DA AVG DAILY MX Oil and grease visual SAMPLE `•` " "` ***• *• •"•" *'• *** " * "• "" MEASUREMENT 840661 0 PERMIT * * *` "* Req. Mon. Y =1;N =0 "*""" """•" " "' *"*'" Monthly VISUAL Effluent Gross REQUIREMENT INST MAX NAMEITITLE PRINCIPAL EXECUTIVE OFFICER Iced' Nunderpenaltyoflawthatthisdocumentandallattachmentsxerepreparedundermydirectionor TELEPHONE DATE supervision In accordance wth a system designed to assure that qualified personnel property gather and • r 1 k O aluate the Information submitted. Based on my Inquiry of the person or persons who manage the (N✓7 / system, or those persons directly responsible for gathering the information, the information submitted W, /1 C F , to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are g�d • aF a y// s significant penalties for submitting fake information, including the possidldy of fine and imprisonment for SIGNATURE OFPRINCIPAL EXECUTIVE OFFICER OR TYPED OR PRINTED nowing viofatrons. AUTHORIZED AGENT ARFJACode I NUMBER MM/DDNYYY 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 RQMNTS.TDS MONITORING -SEE PART VI.A.2.G OF RATIONALE. 30 DAY AVG. IS HIGHEST MONTHLY AVG. DURING PERIOD REPRTD. EPA Farm 3320 -1 (Rev.01 106) Previous editions may be used. 10/17/2013 Page 1- '