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w, .. . <br />• <br />LEAF <br />Kim R. Lawrence, Esq. <br />Lind, Lawrence & Ottenhoff <br />1011 - 11'^ Avenue <br />Greeley, CO 80631 <br />RECEIVED • Forrest Leaf, P.E. <br />13946 CR 56 <br />MAR 0 9 2001 Iilurose, CO t;o733 <br />(970) 398906 <br />(970) 352-1982 FAX <br />Division of Minerals and Geology ccwcdleaf~yahoo.com <br />ENGINEERING <br />February 28, 2001 <br />Re: Ptasnik well injury analysis, S&H Mine <br />Deaz Kim: <br />I have reviewed the proposed S&H gravel pit and the potential for injury to Mike Ptasnik's <br />vrigation and stock wells. Mr. Ptasnik owns 10 irrigation wells and two domestic wells located <br />within 1.5 miles of S&H's proposed gravel mining operation. This letter report presents the <br />potential injury to the 10 irrigation wells and two domestic wells that would result from the dry- <br />mining of gravel cells associated with S&H's gravel mine. <br />Figure 1 shows the location of the 10 irrigation and two domestic wells owned and operated by <br />Mike Ptasnik. The irrigation wells aze used to provide irrigation water to cultivated crop land <br />owned by Mike Ptasnik and have a long history of being used for irrigation of said crop lands. <br />The two domestic wells aze used to provide domestic water to the farm house and also drinking <br />water for livestock. <br />I calculated the historic aquifer response resulting from the pumping ofthe 10 imgation wells and <br />the two domestic wells simultaneously using the Theis method for unsteady radial flow in an <br />unconfined aquifer. In addition, I calculated the additional impact from the proposed S&H mine <br />using the same Theis method. <br />Aquifer properties were taken from the 1972 Hurr and Schneider open-file report "Hydrogeologic <br />Characteristics of the Valley-Fill Aquifer in the Greeley Reach of the South Platte River Valley, <br />Colorado". These properties included the aquifer saturated thickness and transmissivity. Decreed <br />pumping rates for the 10 imgation wells were obtained from the State Engineer's tabulation. It <br />was assumed that the two domestic wells had a flow rate of 15 gallons per minute. <br />The injury analysis for the historic analysis was predicated on the assumption that each well was <br />LEAF ENGINEERING <br />Hydrology ~ Hydraulics Water Resources ~ Water Quality <br />E:LLeaNPiasnacU.aM~rence Plasnik well injury letler repon.wpd <br />