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HYDRO24388
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HYDRO24388
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Entry Properties
Last modified
8/24/2016 8:44:28 PM
Creation date
11/20/2007 4:38:43 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
Hydrology
Doc Date
4/15/1996
Doc Name
DISCHARGE MONITORING REPORTS CDPS PN CO-0000132 QUARTERLY POND INSPECTION REPORT QUARTERLY MONITORIN
From
OXBOW CARBON & MINERALS INC
To
DMG
Permit Index Doc Type
NPDES
Media Type
D
Archive
No
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R W <br />• ~/O~ I <br />Sanborn Creek Mine <br />April 9, 19961 <br />Kathleen L. Sullivan <br />Colorado Department of Health <br />Water Quality~Control Division <br />Permits and Enforcement Section <br />WQCD-PE-B2 <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />RE: Discharge Monitoring Reports <br />Permit Nd. CO-0000132 <br />I <br />Dear Ms. Sullivan: <br />Enclosed are the First Quarter 1996 NPDES Discharge Monitoring <br />Reports for Oxbow Carbon 8 Minerals, Inc., Sanborn Creek Mine. <br />I <br />During the period of February 20 to 22, 1996, the area around <br />Sanborn Creek Mine received abnormally warm weather and rain. <br />Information contained in the report entitled "Frequency An~iysis <br />of Rain on Snow Event of February 21, 1996" by Wric~-;T, Water <br />Engineers prepared for, and to be submitted by, Mountain Coal <br />Company, Westl Elk Mine, indicates t":e equivalent of a 25-year, <br />24-hour storm event. The West Elk Mine is located directly <br />across the Nortl- Fork of the Gunnison River to the south of the <br />Sanborn Cree~.IMine. As a result of the rain and snow-melt run- <br />off, Sanborn Creek Mine discharged for the first time ever from <br />Pond A, Outfal:l 009, and Pond B, Outfall 012. <br />The discharges,, along with the receiving waters upstream of the <br />discharge points, were sampled in accordance with the permit <br />requirements, I and copies of the analyses are attached. As you <br />can see Pond A exceeds, and Pond B is at the standard effluent <br />limitation for. daily maximum total suspended solids of 70 mg/1. <br />Both samples !are within the alternate effluent limitation for <br />settleable solids of 0.5 ml/1 for discharge caused by <br />precipitation within any 24-hour period less than or equal to the <br />10-year, 24-ho'ur precipitation event. Also both samples are <br />within the alternate effluent limitations for discharge caused by <br />precipitation within any 24-hour period greater than the 10-year, <br />2A-hour event .ii <br />I <br />I <br />P O B o x~ 5 3 5 S o m e r s e t C o l o r a d o 8 1 4 3 4 U S A <br />TEL (9 7 0) 9 2 9- 5 1 2 2 F A X ( 9 7 0) 9 2 9- 5 1 7 7 <br />
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