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' 2.04.7 (1) (a) (i) (ii) <br />area is largely confined to the Mesaverde Formation. This <br />formation consists of sandstone, shale, clay, and interbedded <br />coal as shown on Figure 2.04.6(2)(a)-1. The individual ror_k <br />units composing the Plesaverde Formation are not continuous. <br />41ork completed to date by ARCO indicates that groundwater <br />' movement probably occurs horizontally through predominantly <br />sandstone zones and vertically within fractures present wir_hin <br />the various sandstone layers. Permeabilities within the <br />sandstones ma}~ vary from a fraction of one millidarcy to as <br />' much as 10 millidarcies. <br />Preliminary pump tests, by ARCO, were run in cased and uncased <br />holes (SO!•". C 76A, SOM 22-F:-2, SOP'-64, and SOP•1-55) in the Beirren <br />Member. Pump tests were also run in the "F" seam in wells <br />SOP: C76, SOP_ C76A, SOM 23-H-3, and SOb1. C35 (Exhibit 2.6.1.(:) . <br />Transmissivity values were estimated from Lohman 1975. Using <br />' this method <br />Q = 4~{I' <br />s 2.30 I,og10 2.25Tt/r2S <br />?;here <br />Q = discharge <br />T = transmissivity <br />r = radius of the well <br />S = storage coefficient (estimated 0.001) <br />' t = length of pumping time' <br />s = drawdown <br />' From these tests the pumping rate in the Barren Member ranged <br />' from 0.75 to 3 gpm and from 1-3 gpm in the ":" seam. The well <br />yield in the Barren Member ranged from 0.003 gpm/ft to 0.005 <br />' gpm/ft. and was 0.012 gpm/ft. in the "F" coal seam. Transmissivity <br />values in the "F" coal seam were calculated to be 16.68 gpcl/ft <br />' and 2.46 gpd/ft in the Barren idember. The transmissivity, well <br />yield, and pumping rate data from these tests are shown on <br />Table 2.04.7(1)(a)(ii)-12 indicates that the sands in the E:arren <br />R°VISED Pray 15, 1981 46a <br />