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Horizontal permeabilities were computed from these transmissivites. The <br />permeabilities were computed by dividing the portion of [he well penetration <br />which is thought to be saturated and permeable into the transmissivity. <br />The permeabilities of the sandstones will be high if the vertical perme- <br />abilities of the sandstones are in the same range as the horizontal values <br />for cases where the well penetrates a small portion of the sandstone [hick- <br />ness. A horizontal permeability of 2400 gpd/f t2 was computed for the Flume <br />aquifer while values of 630 and 550 gpd /f t2 were estimated for Pyeatt. <br />A permeability of 800 gpd /f t2 for the thin sandstone of the Lewis Shale <br />was computed from the P-3 test. The test on wells P-4, P-5 and P-6 pro- <br />duced horizontal permeabilities of 0.01, 76 and 88 gpd/ft2 for. the sand- <br />stone above the G coal seam. A significantly higher permeability of <br />340 gpd/f t2 was computed for the sandstone below the G coal seam. <br />• <br />The observations at well P-2 indicate a specific yield of 0.012 for the <br />Pyeatt alluvium. This value seems reasonable for a very fine grained <br />aquifer . Similar values for the specific yield would be expected for the <br />highly cemented sandstones. The coarser fill in Flume Gulch probably has <br />a much larger specific yield. <br />Table 2.7-36 presents the results of the ground-water analyses of these <br />wells. The surface flow (ground-water seepage) at site S3 (see Map M30 for <br />location) is also given in this table, Flow in the Pyeatt Gulch on 10/03/80 <br />was only a few gallons per minute. The aluminum and selenium concentrations <br /> are significant relative to use of the water for continuous irrigation in <br />• some of the groundwater in this area. The total dissolved solids of the' <br /> groundwater in these sites indicate a very high salinity classification <br />2-570 <br />