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2.04.7 (1) (a) (i) (ii) <br />area is largely confined to the t~esaverde 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 rock <br />units composing the Piesaverde Formation are not continuous. <br />Flork completed to date by ARCO indicates that groundwater <br />movement probably occurs horizontally through predominantly <br />sandstone zones and vertically within fractures present within <br />the various sandstone layers. Permeabilities within the <br />sandstones may 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 (SOt: C 76A, SOM 22-Y.-2, SOP'-64, and SOti-55) in the Barren <br />Member. Pump tests were also run in the "F" seam in wells <br />SOPS C76, SOti C76A, SOM 23-H-3, and SOM C35 (Exhibit 2.8.1.C). <br />Transmissivity values were estimated from Lohman 1975. Using <br />this method <br />• 4 = 4~ <br />s 2.30 Log10 2.25Tt/r2S <br />'rThere <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 Piember 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 gpd/ft <br />and 2.46 gpd/ft in the Barren 2.lember. 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 Earren <br />5-11 <br />REVISED PSay 15, 1981 <br />