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�- December 23,2002 <br /> Job Number:LGO2492 <br /> Page 5 <br /> (no. 256)(Plate 7)1. The San Joaquin Soil Survey describes the soil as a very deep,well drained, <br /> nearly level soil on low fan terraces. It formed in alluvium derived from granitic rock sources. <br /> Permeability is moderately rapid in the Guard clay loam. Table 1 presents selected properties of <br /> the Tokay fine sandy loam. <br /> Table 1. <br /> Selected soil properties of the Guard clay loam, <br /> San Joaquin County Soil Survey report.' <br /> Soil Name and Map Depth(in) Unified Soil Salinity Soil Septic tank <br /> Symbol Classification mmhos/cm Reaction absorption <br /> _ pH field <br /> Guard clay loam,0 0-15: Clay loam. CL <2 7.9-8.4 Severe:peres <br /> to 2%slopes, 169. 15-72:Clay loam, SC,CL <2 7.9-8.4 slowly. <br /> sandy clay loam. <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> A total of two, 3-foot deep percolation test borings, were drilled on the property to locate soils <br /> with a satisfactory percolation rate. Due to the shallow depth of ground water that is possibly <br /> less than 10 feet, no deep percolation test was performed on the property. Essentially the soils at <br /> both locations were composed of black fine silty sand with clay to a depth of 1.5 feet followed by <br /> a light grayish brown silty sand with some clay to a total depth of 3 feet. The first location(P-1) <br /> - had a slight higher clay content at the 3 foot depth then the second location(P-2). The soils <br /> encountered in the borings generally agreed with those presented in the San Joaquin Soil Survey. <br /> Plate 1 identifies the location of the percolation test. <br /> L <br /> Both the percolation test borings were drilled utilizing a 4-inch hand auger drill. The casing used <br /> for the percolation test was 2-inch diameter PVC pipe with an open end on the top and bottom. <br /> Perforations were made on approximately the last 12 inches of the casing. Two inches of"pea <br /> gravel'was placed in the bottom of the hole, the casing was installed, and one foot of"pea <br /> ` gravel'was backfilled in the annular space. The percolation test boring was pre-soaked 24-hours <br /> prior to each percolation test. <br /> A 4-hour percolation test was started on P-I on December 13,2002 Plate 1). After I hour of <br /> testing,the result of the P-1 test indicated an unsatisfactory percolation rate of 250 minutes per <br /> L <br /> _ 6 USDA Soil Conservation Service,Soil Survey of San Joaquin County,California, Sheet 18. <br /> ?�E♦�O <br /> ♦ iY <br /> ♦ <br /> p4 <br /> 7 ,Q�\ <br />