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r. September 30,2002 <br /> Job Number:LG02-310 <br /> Page 5 <br /> The San Joaquin County Soil Survey lists the surface soils at the proposed project <br /> location as Vignolo silt loam (Plate 7).6 For general background information, the following table <br /> 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 /> Vignola silt 0-17: Silt loam ML,CL-ML <2 7.4-7.8 Severe: <br /> loam,0 to 2% 17-33:Loam,silt loam ML,CL-ML <2 7.4-7.8 cemented pan, <br /> slopes,270. '33-60:Cemented --- --- Peres slowly. <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. See the soil <br /> OWN descriptions contained in the soil boring logs attached in the appendix. Generally,the soil <br /> properties from the San Joaquin Soil Survey were similar to the soils encountered within the <br /> deep percolation test borings. <br /> w. <br /> All the percolation test casing used for the test was a 2-inch PVC casing with an open end <br /> on the top and bottom. Perforations were made on approximately the last 12 inches of the <br /> casing. The percolation test hole was constructed by first placing approximately two (2)inches <br /> of"pea gravel" in the bottom of the clean boring. The casing was set within the open boring on <br /> top of the gravel base. One(1) foot of"pea gravel"was backfilled in the annular space around <br /> the PVC casing. The percolation test borings were pre-soaked 24-hours prior to the test on <br /> August 20, 2002. <br /> A four(4)hour test was conducted for each percolation hole. Each test was conducted on <br /> August 21, 2002. The drop of water was measured each 1/2 hour. The drop and other information <br /> 6 USDA Soil Conservation Service, 1992,Soil Survey of San Joaquin County,California, Sheet 12& 13. <br /> �OE4d�y <br /> > w <br /> � w <br /> G 4 <br /> Yjs o� r <br /> L <br />