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SENT BY: GREYSTONE ENVSRONAIENTAL; 303 669 0194; JUN-5-03 5:17PIA; PAGE 2 <br />FAX TRANSMISSION <br />GREYSTONE <br /> 5231 5auth quebec Street ~ Greenwood Village, Colorado 80111 <br />Phone (303)850-0930 Fox: (303)721-9298 <br /> F~bw~«.-~ I ~ 2vo2 <br />To: Henry Barbe Oate: September 21, 2001 <br /> <br />Company: <br />Mountain Coal Company <br />Job #: faxed q,oopr <br />210-48 CAL <br />Fax #: 9T0-929-55959 <br />~/ <br /> <br />From: / <br />! <br />Mike Kolin ~~M`~ <br />Pages: <br />5 including cover sheet <br /> mkolinQgreystone-consu Itants.com <br /> Fax No. (303)689-0194 <br />SubJect: Runoff Calculations for grill Pad <br />COMMENTS: <br />Henry: <br />Attached are four more pages of SEDCAD output to be placed with the pages I faxed to <br />you yesterday. These are for the 1 -acre and for the 120 ft x 180 ft (Yz acre) drill pads. <br />The results are as follows: <br />.5 acre 1.O acre Z•O acre <br />Runoff from 10-year,24-hr storm (ac-ft) .054 .109 .217 <br />Peak Discharge (cfs) .63 1.26 2.52 <br />Please let me know if there is anything else you need. <br />• Environmental Planning ~ Environmental Impart Assessment <br />• Peruilt Acquisition • Wield Studies <br />• Environmental Audits • Site AssessmentlRemediation <br />• Mitigation/Monltortng • Natural Resource Management <br />F.nvirvmmental Planners, .Scientists, and F•ngtneers <br />