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for the I and H coal seams and sandstones between was measured for the <br />transmissivity of this unit. The test of the DE coal seam and adjacent <br />sands produced a transmissivity of 2500 gal/day/ft. <br />Little well construction and testing documentation is available for these <br />tested wells, especially at test sites A and B. There is some question <br />concerning the effectiveness of the hydraulic isolation for the test <br />intervals in each well. However, the results of the aquifer tests probably <br />provide useful estimates of the hydraulic properties of the Upper SJilliams <br />Fork, (Radian, 1980) <br />Most of the pumping and observation wells were completed in or near coal <br />seams. A representative permeability for the coal seams and nearby strata <br />is 15 gpd/ft2. Permeabilities are undoubtedly much lower for the shale <br />sections of the Upper LJilliams Fork. The deep Utah International pumping <br />test (coal horizon in the Lower h'illiams Fork) showed a vertical permeability <br />of 7 gpd/ft` in a fractured sandstone unit overlying the tested coal zone. <br />The Upper LJilliams Fork aquifers probabl}• could have similar high vertical <br />permeability in fractured zones. The aquitards between the aquifers have <br />low horizontal and vertical permeabilities. Overall, the Upper [Jilliams Fork <br />retards vertical flora. <br />.o..,,~ cti~to <br />The Lewis Sliale is composed of uniform dark gray to tan shale with minor <br />occurrences of thin sandstone strata. The shale has loca porosity and perme- <br />ability, and it acts more as an aquiclude (confining bed) than as an <br />aquifer or aquitard. LJhcre it overlies the Upper Unit of the LJilliams Fork <br />2-461 <br />