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SENT SY: GREYSTONE ENVIRONMENTAL; 303 G89 0194; <br />Fax TRANS <br />GREYS <br />5231 South Quebec Street ~ G <br />To: Henry Barbe <br />Company: Mountain Coal Company <br />Fax #: 970-929-5595, , j <br />~ <br />~' <br />From: Mike Kolin / <br />1~ <br /> mkolin@g reystone-consultants. cotT: <br /> Fax No. (303)689-0194 <br />Subject: Runoff Calculations for Drill Pad <br />JUN-30-05 9:02AM; PAGE 2 <br />SSION <br />Village, Colorado 80111 <br />F.e.b~u~ I~ 2cYO2 <br />Date: September 21, 2001 <br />Job#: 210-48 taxed q:mpw~ <br />~~~- <br />Pages: 5 including cover sheet <br />COMMENTS: <br />Henry: <br />Attached are four more pages of SEDCAD outpui'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 (''/z acre) drill pads. <br />The results are as follows: <br />.5sacre 1.0 acre 2.0 acre <br />Runoff from 10-yeag24-hr storm (ac-ft) .054 .109 .217 <br />Peak Discharge (cfs) .6~ 1.26 2.52 <br />Please let me know if there is anything else you need. <br />Environmental Plaru+crs, <br />• Environmental Planning <br />• Permit Acyuisition • <br />• Environmental Andits <br />• Mitigation/Monitoring <br />and Enbi+uers <br />Environmental Impact Assessment <br />Ficld Studies <br />Site AssessmenURemediation <br />h Natural Resource Management <br />