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PERMITTEE NAME/ADDRESS (Indude Facility Namekocatfon it'Diftrent) NAME: Oxbow Mining LLC ADDRESS: PO Box 535 Somerset, CO 814340535 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 I 015-A PFERMITNUMBER DISCHARGE MBER MONITORING PERIOD MM/DD/YYYY MM/DD/YYYY 03/01/2015 03/31/2015 Form Approved OMB No. 2040 -0004 DMR Mailing ZIP CODE: 81424 -0535 MINOR GUNIS DISCHARGE TO ELK CREEK External Outfall No Discharge 10 PARAMETER I oemfy under penahy, of lawthat this document and all attachments were prepared under my supervmion In accordance with a system designed to assure that qualified perearaw Proper.,=Z luate the tnformatmn sub -i ted Based on my inquiry of the person or parsorm who manage d e system or those persore dlreatly respormible for gathering the information, the Intormabon submdted b. to the best of my kraWedge and beliet, true. accurate, and complete. I am aware that there are QUANTITY OR LOADING QUALITY OR CONCENTRATION NO. EX FREQUENCY OF ANALYSIS SAMPLE 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 MX 7D AV 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 500501 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 QRTR AVG DAILY MX Oil and grease visual SAMPLE * * *` ** "*" •* """• �"•`"` "` *M• MEASUREMENT 840661 0 PERMIT *`"*** Req. Mon. Y =1;N =0 """` '•*"" *"•`• "*"' Weekly VISUAL Effluent Gross I REQUIREMENT I I INST MAX NAMEITITLE PRINCIPAL EXECUTIVE OFFICER I oemfy under penahy, of lawthat this document and all attachments were prepared under my supervmion In accordance with a system designed to assure that qualified perearaw Proper.,=Z luate the tnformatmn sub -i ted Based on my inquiry of the person or parsorm who manage d e system or those persore dlreatly respormible for gathering the information, the Intormabon submdted b. to the best of my kraWedge and beliet, true. accurate, and complete. I am aware that there are /�i ►'►'"� v�• I ! r Y 1 a ` , (� TELEPHONE DATE low M p �o - qLi ,S't?D 6 a y/o zo SIGNATURE OF PRINCIPAL EXECUTIVE OFFICER OR /xn T r l / K� agnmcant penatoes forsubnwng false Information. mcludmg ft posalduty of mre and bnprmonmerd for 7 AREAcode NUMBER I MM/OD /YYYY (�/� _..___ _.. _......�.- rewire=laaorm. AUTHORIZED AGENT COMMENTS AND EXPLANATION OF ANY VIOLATIONS (Reference all attachments here) 30 DAY AVERAGE IS HIGHEST MONTHLY AVERAGE DURING PERIOD REPORTED. OIL & GREASE - SEE 1.6.1.1). EPA Form 3320 -1 (Rev.01 106) Previous editions may be used. 10/17/2013 Page 1