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Chevron U.S.A. - Page 14 <br /> 11.0 DISCUSSION OF FINDINGS <br /> Exploratory soil borings were advanced at the subject property in order to ' <br /> obtain subsoil samples for observation of subsurface conditions and chemical <br /> analysis; to develop logs of soil borings; and for the installation of ground <br /> water monitoring wells. <br /> The subsoils and sediments encountered at the subject property were <br /> generally comprised of fine grained sands with silt and clay, with interbedded <br /> lenses of silts and clays. Silty sand was encountered in all of the soil borings <br /> at. an approximate depth of 76 feet below the existing grade to the maximum depth <br /> of our exploration. <br /> Ground water was encountered in each soil boring at an approximate depth of <br /> 71 .feet below the existing grade at the time of our field exploration. Each <br /> exploratory soil boring was completed as a ground water monitoring well. The <br /> monitoring wells were constructed utilizing 4 inch diameter PVC flush-thread well <br /> casing. The screened interval of each well was set with approximately 10 feet <br /> fi above and below the encountered ground water level at the time of our field <br /> L�+ <br /> study. <br /> Each well was surveyed to help establish a surface elevation, which was <br /> utilized in the evaluation of ground water depth, gradient, and direction of <br /> flow. The ground water elevation calculated from measurements made at the time <br /> of our field study were utilized in assessing ground water gradient and direction <br /> Lr of ground water flow at the subject property. Based upon review of the ground <br /> water elevation data and locations of the ground water monitoring wells, an <br /> DAMES & MOORE <br />