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J. H. KLEINFELDER & ASSOCIATES _ <br /> File No. S-1008-35 <br /> May 17, 1985 <br /> Page 9 <br /> IABORATORY TESTS <br /> Laboratory tests were performed of 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 the existing well near the shop building, there appears to be 5 wells <br /> within a one mile radius of the site. Attempts were made to measure the depth to <br />