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• Pump tests for the Third White Sandstone in this area have <br />also been conducted on wells GC2 and GP9. Transmissivities of 4.4 <br />and 30 gal/day/foot were obtained from these two pump tests, with <br />horizontal permeabilities of 0.01 and 0.07 ft/day. Flow in the <br />Third. White Sandstone is estimated to be approximately 6 gpm for a <br />width of 3000 feet of the Third White Sandstone, a hydraulic <br />gradient of 0.09 ft/ft and a transmissivity of 30 gal/day/foot. <br />This indicates that the alluvial system can convey a much larger <br />rate than the Third White Sandstone in the area of the Flume draw. <br />Hydro-Engineering (1992) presents an updated analysis of the <br />water quality conditions in the Third White Sandstone and the Flume <br />alluvial system in this area. Section 3.0 of this report should <br />be reviewed for the latest information on the water quality in <br />• these two aquifers. The field conductivity in the upstream Elume <br />well GC3 has significantly increased from 1985 through 1990 due to <br />the decrease in recharge in this area. An overall increase in TDS <br />has also been observed over this period of time in the downstream <br />alluvial well at the Coy site. Field conductivity at the Coy site <br />is slightly greater than that observed upstream, with both of these <br />field conductivities in the neighborhood of 2000 µmhos/cm. Wells <br />GC2 and GP9 monitor the Third White Sandstone in this area. The <br />field conductivity in the Third White Sandstone }ias generally <br />decreased in the last couple of years; probably due to. slightly <br />larger recharge rates during this period of time than in the <br />previous several years. Field conductivity in the Third White <br />Sandstone in this area is slightly less than that in the Flume <br />REVISED 11/03/92 <br />.~.. ,'~jj~i~•~i <br />- _ _ <br />? ~/ 9 3 <br />_ ... , . <br />. ... <br />.. _ . <br />,. _ _ , <br />-:--.._ . <br />~: <br />... <br />.. ..,.., <br />