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� 3 <br /> 2 <br /> s <br /> GEOLOGY <br /> l f' <br /> The geology of the region-area is sedimentary in nature, a <br /> combination of fluvial-marine strata consisting of silts and clay <br /> facies with lenses of sand and gravelly silts and clays. <br /> S01L TYPES <br /> Soil to a depth of 28 feet was generally silt-clay with <br /> sands dispersed throughout the silt-clay matrix. Sand and gravel <br /> strata are to be found at deeper depths of 30 to 60 feet and over <br /> silty clay at 56 to 60 feet. Drilling logs were attached to the <br /> preliminary report in September 1987. <br /> GROUND WATER <br /> Ground water in the area is approximately 90+ feet deep per <br /> San Joaquin County Department of Public Works. Seasonal fluctua- <br /> tions are unknown at this time. Monitor Well No. I has a depth <br /> to ground water of 83 feet. <br /> GROUND WATER GRADIENT <br /> The ground water gradient was measured on November 8, 1987, <br /> as shown on Plate No. 4. Two existing wells, 500 gpm and 2000 <br /> _ gpm, are used daily, Monday through Friday, in aggregate and <br /> asphalt production. Measurements were made late Sunday to permit <br /> 48 hours for stabilization. Plate 3 shows the ground water <br /> gradient to be northwest at a rate of 1 foot/400 feet. <br /> The gradient as determined using these three wells generally <br /> agrees with the region ground water gradient. The local ground <br /> water gradient is probably influenced by both the 2000 gpm and <br /> the 500 gpm wells. <br /> {x <br /> E <br /> WELLS <br /> There are three (3) in3ustrial water supply wells and one <br /> domestic well on the site (se. Plate No. 3) . One is located to <br /> the northwest at a distance of approximately 900'+ feet with a <br /> capacity of 500+ G.P.M. One is located to the northeast at a <br /> distance of approximately 7501+ feet with a capacity of 2000+ <br /> G.P. F. ; draw down, for this well is one foot/100 gallons. A third <br /> 8" domestic well is located about 2301+ east of the 2000 G.P.M. <br /> well. The fourth well is located 980' northwest, has a 6" <br /> diameter, and has not been used for many years. The pump motor <br /> - - - --- has -been---removed--but -the-pump--impellers- are _wedged_ in_place__and___ <br /> can't be pulled. Ground water gradient is to the northwest at a <br /> rate of one foot/400 feet. <br /> -2- <br />