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(b) The design depth unc/ elevu[iou ujany impormded waters ut [Ire [inre of the ini[iul certi/icu[ion report or [he uvernge and marimum dep[ha aru! e(evulinn.e of uny impounded waters over the past year frn• dre armunl certification reports. r\t the time of the initial certification, the design depth is 1.94 feet based on the minimum elevation of 698.06 and spilhvay elevation of 6987 determined during the survey performed on November 2~, 1997. The elevation of [he impounded waters at the time of [he survey was calculated as the average elevation of [he top of the ice at 6986.45. (c l E.ri.eting.ctorage capuci[y of the denn or enrbunkurenl Livestock water tank 6-h is an excavated impoundment with no dam or embankment. The srora~,e capacih~ of the impoundment is approximately 12,000 gallons. ('cl1 .9tiy Jires occurru7g in the constrnction nunerial up to [he dote of Nre inilirrl cerli/icdtiorr, nr over the part year for the unnrral cerli~catiorr reparls'. fo the best of my knowledge, no tires have occurred in the construction material up to the date of the initial certification. (e) Ar7v other aspects of the door or enrban/nnenl uffecling stubilih~. The analysis of [he spilhvay assumed that the channel was grass lined. Field observations of the spilhvav area indicate good vegetative cover. Erosion in the spillway area may occur if the vegetation is removed. Thank you for your consideration in [his matter. Enclosed are copies of the SEDCAD+ runs for livestock water tank 6-b, the drainage basin delineation, and the survey of the pond conducted on November 2~, 1997. 'T'his package will be included in the Livestock Water Tank Certifications on file at the Twentymile Coal Company Environmental Department. Please contact me at (970) 870-275U with any questions or comments regarding this issue. COLORADO YAMPA COAL COMPANY F Tavis~. tjgers. P.E. y;° . Date Envirgn+m,dn[a~>t~i~,eel ~ Colorer ~eeistered &T~&i. 31741 ends.