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PERMITTEE NAME/ADDRESS (Include Facility Namakocation 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 016 -A PERMIT NUM ER DISCHARGE NUMBER MONITORING PERIOD MMIDDIYYYY MMIDD/YYYY 02/01/2015 02/28/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS SURFACE RUNOFF TO ELK CREEK 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,24 HR PRECIP EVENT;SETTLEABLE SOLIDS LIMITS 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 RPTD. EPA Form 3320 -1 (Rev.01106) 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 ** «..• RRR * *. RRRRRR YH #*R MEASUREMENT 0040010 PERMIT `***'* "«'*"* """`"« 6.5 *""" 9 SU Monthly INSITU Effluent Gross REQUIREMENT MINIMUM MAXIMUM Solids, total suspended SAMPLE ****** • * **'* * **«*' ****** MEASUREMENT 005301 0 PERMIT *"*•** «** **' "*""«* *" `** 35 70 mg/L Monthly GRAB Effluent Gross REQUIREMENT 30DA AVG DAILY MX Solids, settleable SAMPLE R " "*"* •«*"** *RRRRR * ""*** MEASUREMENT 0054510 PERMIT "*•*** * * ***• **""** ***'** Req. Mon. Req. Mon. mUL 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 « * *«"• •***** **«"«• *****« *RRRRR MEASUREMENT 0358210 PERMIT `+'«** .RRR.R `*•*** *•«" *`**" 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 840661 0 PERMIT "«* ** Req. Mon. Y =1;N =0 ""*"`• """"` " """ """"" Monthly VISUAL Effluent Gross REQUIREMENT INST MAX COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) TSS & TOTAL IRON LIMITS WILL BE WAIVED, AND SETTLEABLE SOLIDS LMT APPLIED FOR < 10YR,24 HR PRECIP EVENT;SETTLEABLE SOLIDS LIMITS 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 RPTD. EPA Form 3320 -1 (Rev.01106) Previous editions may be used. 10/17/2013 Page 1