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.; <br />February 25, 1991 <br />Ms. Kathy Dolan <br />Colorado Department of Health <br />Permits and Enforcement Section <br />4210 East 11th Avenue <br />Denver, CO 80220 <br />RE: NPDES Permit for Coal Loading Facility <br />Dear Ms. Dolan: <br />HydroDynamics Incorporated <br />19039 E. Plaza Dr., Su/fe 253 <br />P.O. Box 1327 Parker, CO 80134 <br />(303) 841-0377 <br />~. <br />" ~ ~ ~~ ~% ~ <br />- i'%91 <br />r;.,.. <br />Attached, you will find a completed NPDES Permit form for a coal loading <br />facility to be located West of Rifle, Colorado. Specific information <br />concerning the site, containment facility, drainage and discharge point have <br />been illustrated on the attached figures. <br />Since the containment pond has been designed to capture runoff water resulting <br />from a 10-year, 24-hour event or less, it is anticipated little flows will <br />leave the site. If significant runoff water is collected, it will stand in <br />the pond for at least 24 hours before being pumped into the drainage channel. <br />Prior to pumping, a water sample will be collected and tested for constituents <br />required by your department. Small amounts of water will be allowed to <br />evaporate and not pumped into the channel. <br />If any questions need answering, please do not hesitate to contact me. <br />Yours truly, <br />Jerald S. Fifield h.D. <br />Professional Hydrologist <br />JSF/jf <br />Attachment <br />W. a!er Resources <br />Hydrologlsfs • Engineers • Planners <br />