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HYDROGEOLOGY <br /> Depth to water measurements were taken immediately <br /> following well installation. This initial value was not used <br /> for calculation purposes and only served as a general indicator <br /> of the water level . Precise measurements were taken 24 hours <br /> after the wells had been bailed and sampled. <br /> A hydraulic gradient was calculated from the depth <br /> measurements collected July 24 , 1987 . The diagram on the <br /> following page shows the gradient direction. <br /> The main water bearing strata intercepted by the <br /> piezometric and monitoring wells is a fine sand layer which <br /> lies within the 25 to 35 foot interval across the entire site. <br /> Based on the data presently available, this strata appears to <br /> be dipping slightly toward the southeast as it is initially <br /> encountered at depth in PW-1 . <br /> Groundwater under artesian pressure from this strata, <br /> along with water contributed from storage within the silts and <br /> clays above, yields a static water level between 12 and 13 feet <br /> below grade in all of the wells. <br /> One factor yet to be fully investigated is the possibility <br /> of seasonal fluctuations of the groundwater elevation. The <br /> proximity of the site to the San Joaquin River less than one <br /> mile distant, creates a concern regarding possible seasonal <br /> fluctuations. <br /> 7 <br />