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August 29,2002 <br /> Job Number: LG02-152 <br /> Page 4 <br /> The San Joaquin County Soil Survey lists the surface soils at the proposed project <br /> location as Madera sandy loam (Plate 7).4 For general background information, the following <br /> table presents some general engineering properties for the given soil. <br /> Table 2. <br /> Selected Soil Properties Located on the Site <br /> From the San Joaquin County Soil Survey (Plate 7). <br /> Soil Name and Depth(in) Unified Soil Salinity Soil Septic tank <br /> Map Symbol Classification mmhos/cm Reaction absorption <br /> pH fields <br /> iV1aLLG1G Ja11LLy V-17. J411LLy 1V4111 J1V1 <L 5.6-7J JCVefC: <br /> loam,0 to 2% 19-23: Sandy clay loam SC <2 6.1-7.3 cemented pan, <br /> slopes, 193. 23-29:Clay,clay loam CL,CH,SC <2 6.6-8.4 peres slowly. <br /> 29-60: Indurated --- <2 --- <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> A shallow and deep percolation test was conducted on each parcel to evaluate the <br /> suitability of the shallow soil. Plate 1 identifies the locations of the percolation tests. Each of the <br /> percolation test borings was drilled utilizing a 6-inch diameter truck mounted auger. The casing <br /> used for the percolation test was 2-inch diameter PVC pipe with an open end on the top and <br /> bottom. Perforations were made on approximately the last 12 inches of the casing. The <br /> percolation test casings were constructed by placing two (2) inches of"pea gravel"in the bottom <br /> of the cleaned boring. Next, the casing was installed in the boring on the gravel base then one <br /> (1) foot of"pea gravel"was backfilled in the annular space. The percolation test borings were <br /> pre-soaked 24-hours prior to the test on April 29, 2002. <br /> A four(4)hour test was conducted for each percolation hole. Each test was conducted on <br /> April 30, 2002. The percolation tests were observed by Ms. Lisa Medena, Environmental Health <br /> Specialist for San Joaquin County Environmental Health Division. The following table presents <br /> a summary of the percolation tests. <br /> 4 USDA Soil Conservation Service, 1992,Soil Survey of San Joaquin County,California, Sheet 27. <br /> ?OERSO <br /> 1 <br /> j W <br /> O � <br /> ♦SS O L♦ <br /> f <br />