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around a pum <br />historic pump <br />distance of <br />approximately <br />In estimating <br />near the No. 5 <br />used: <br />ng <br />the <br />well. The one foot drawdown caused by the <br />it the No. 5 Mine Wells is estimate to occur at a <br />t one mile from the pumping well, which is <br />distance to the Okie Plaza well. <br />the drawdown due to pumping at the No. 5 Mine Wells <br />Mini portal, the following data and assumptions were <br />• The aqu~fer is confined, and assumed to be semi-infinite, <br />flat ly ng and homogeneous; <br />• The san stone aquifer thickness ranges from 62 to 91 feet <br />over t e property; the hydraulic conductivity lies <br />between 0.1 and 1 ft/day; the transmissivity thus lies <br />between 6 and 91 sq. ft./day. <br />• The sto ativity is assumed to lie between 0.001 and <br />0.0001. <br />• The pum ing rate at the No. 5 Mine Wells is 2.5 gallons <br />per min te, which was the average for 1992. <br />• Estimat d draw downs were first calculated for the Okie <br />Plaza 1 Gated at a distance of 5,200 feet from the No. 5 <br />Mine We ls. <br />• The dra down was calculated for constant pumping for 500 <br />days. <br />Table 76A shows t e best estimate for drawdown at the Okie Plaza <br />well using the Th is, non-steady solution for 500 days of pumping <br />in on the order of 1 foot. The bounding range for this estimate is <br />0.2 to 7 feet. T e high estimate of 7 feet drawdown would apply <br />only in a uniforml poor-yielding siltstone. <br />Table 76A <br />Drawflown @ 00 days @ Okia Plaza well Due to Pumping <br />@ No 5 14ine Wella (by Theis solution) <br />Transmissivity <br />(ft^2/d) <br />6 <br />40 <br />91 <br />etorativity <br />0.0001 0.0005 0.001 <br />s (ft)= 7.1 s (ft)= 1.2 s (ft)= 0.2 <br />s (ft)= 2.7 s (ft)= 1.3 s (ft)= 0.8 <br />s (ft)= 1.5 s (ft)= 0.9 s (ft)= 0.6 <br />The shaded central box represents the drawdown calculated from the <br />best estimates for aquifer parameters. <br />