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.. -. • Lawrence Ptasnik Well Injury Letter Page 2 pumping at it's decreed discharge rate simultaneously. The drawdown at each well was calculated after 90 days of simultaneous pumping, which would be the case during a dry yeaz. The historic drawdown for each well is the result of the effect of that particular well's pumping on itself and the commutative injury from all of the other pumping wells on that particular well. This exercise was conducted for each well. Table ] contains a summary of the historic drawdown for each of the 10 irrigation wells and two domestic wells, column [2]. TaNel Summary of Ptunik Kell Dnwdown Dnxdown Saturated FGstorir with Well Thirknna Dnxdown S&H Pit lNl [!rl (hl II] [21 [31 s-14542 60 14.5 26.77 4-14541 40 1825 30.52 13626 40 2762 46.11 11498 40 25.29 43.78 14047 30 21.01 43.5 4~209F 30 20.37 38.86 10747 30 78.75 24.7 3-14540 30 16.53 19.06 2-14041 20 19.93 22.46 3-14042 30 16.89 19.42 Dome~tir I 20 7.72 26.21 Domestir2 20 771 26.21 The drawdown associated with the proposed mining of the S&H pit is also presented in Table 1, column [3]. Drawdown calculations for the dry pit mining were calculated after 365 days of continuous dry-mining in an average cell consisting of approximately 45 surface acres. It was assumed that the pumping rate for the pit de-watering was continuous at a discharge of 8.9 cfs. The impact from the dry pit mining was added to the historic well drawdown, column [2], in Table 1 to show the potential injury of the gravel mining on all of Mr. Ptasnik's wells at the end of the 90 day pumping period for the wells and 365 days of continuous pit de-watering. It is evident from Table 1 that the proposed dry pit mining will cause increased water level drawdown in each of the Ptasnik wells. Furthermore, when comparing this increased drawdown LEAF ENGINEERING Hydrology ° Hydraulics ° Water Resources ° Water puality E:V.eaPPtasniklLawrence Rasnik well injury Iener repOrt.wpd