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04/11/01 18:51 $9700561111 THE L4N BUILDING (~J005/007 ~` ~ . • Lawrence S8c1•I Well Injury Letter Page 2 calculated after 90 days of simultaneous ptunping, which would be the case during a dry yeaz. The historic drawdown for each well is the resuh 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 we1L This exercise was conducted for each well. Table 1 contains a summary of the historic drawdown for each of the 16 irrigation wells and 9 domestic wells, column [2]. Table l Snttmwry arwell Dnwtbwn Drawdown Saturated ILs[orie with Well 'ILiekucss Drawdown SdkHPit f Il i.21 131 14041 20 14.68 17.41 3-14042 30 16.90 19.43 3-14540 30 IS.71 IB..A 10747 30 16.75 19.97 4-4209F 30 18.54 30.A1 2-14043 30~ 23.34 35.61 11498 40 24.89 37.16 11494 4U 23.86 36.15 13626 40 24.57 32.90 5-14542 60 20.87 33.14 4-14541 40 2227 3454 No Permit 50 IG.82 22.77 -12022 30 20.80 33.07 12948 40 20.86 33.15 1-12934 20 16.68 27.01 1-14131 30 15.62 21.57 Domestic 1 -9 20 14.60 26.60 The drawdown associated with the proposed mining ofthe S&H pit is also preserned in Table 1, colultm [3]. Drawdown calculations for the dry pit mining were calculated after 365 days of continuous dry-mining in an average cell consisting of approxitnately 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 the wells at the end of the 90 dny pumping period for the wells and 365 days of continuous pit de-watering. LEAF ENGINEERING Hydrology "Hydraulics ' Watar Resources ~ Water Quality E:LLmMwmiklLawtaKC 58H well injury Icntt rt~rt.wpd