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). H. KLEINFELDER & ASSOCIATES <br />C7 <br />.7 <br />File No. S-1008-35 <br />May 17, 1985 <br />Page 9 <br />LABORATORY TESTS <br />Laboratory tests were performed ai selected samples of the soils encountered in <br />the test borings. The tests consisted of Moisture Content and Dry Density Determinations, <br />Gradation Analyses, Atterberg Limits Tests, and Permeability Tests. The results of the tests <br />are summarized on Plate XII. <br />GROUNDWATER <br />The geologic formations which underlie the site influence the movement and quality of <br />groundwater. The oldest significant fresh water bearing formation on the east side of the <br />valley is generally considered to be the Mehrten Formation. Many of the sands of the <br />Mehrten Formation are relatively permeable and furnish water of good quality to deep wells. <br />The hydrologic characteristics of the Laguna Formation which overlies the Mehrten Formation <br />are variable. Bodies of perched water are common in its outcrop areas. Despite the <br />thinness of the Quaternary alluvial sediments, a number of wells obtain large yields from the <br />sand and gravel stringers. However, most of these wells often penetrate the underlying <br />Laguna Formation and in many cases, the Mehrten Formation. <br />In summary, most water used in the eastern portion of San Joaquin County is drawn <br />from the Arroyo Seco, Laguna, and Mehrten Formations. The groundwater obtained from <br />these formations is continually being recharged by percolation from surface waters which <br />originate in the Sierra Nevada or adjacent foothills. <br />WELLS <br />In addition to <br />the existing well near <br />the shop <br />building, there <br />appears <br />to be 5 wells <br />within a one mile <br />radius of the site. <br />Attempts <br />were made to <br />measure <br />the depth to <br />