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r <br /> March 26,2003 <br /> Job Number:LG02-031 <br /> Page 5 <br /> r <br /> Table 1. <br /> Selected soil properties of the Jacktone clay, <br /> San Joaquin County Soil Survey report.' <br /> [Soil Name and Depth(in) Unified Soil Salinity Soil Septic tank <br /> Map Symbol Classification mmhos/cm Reaction absorption <br /> PH field <br /> Jacktone Clay,0 0-22: Clay. CL,CH <2 6.6-8.4 Severe: <br /> to 2%slopes, 22-34:Clay loam,clay, CL,CH <2 7.9-9.0 cemented pan, <br /> 180. silty clay. peres slowly. <br /> 34-37: Indurated. — — — <br /> ` 37-46:Loam,clay loam CL-ML,CL <2 7.9-9.0 <br /> 46-60: Cemented. <br /> [Ve:nritas fine sandy 0-15: Fine sandy loam, SM,SC-SM <4 7.4-8.4 Moderate: <br /> 0 to 2% 15-54: Sandy loam,fine SM,SC-SM <4 T4-8.4 flooding, <br /> ,266. sandy loam. cemented pan. <br /> 54-70:Cemented — — — <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> A total of five (5), 3-foot deep percolation test borings,were drilled in an area which could <br /> potentially be used for domestic waste water disposal(Plate 1). In addition to the five(5) <br /> _ shallow percolation test holes,two (2) deep geotechnical borings were drilled on the site and <br /> generally represent the deeper soil conditions thought to exist across the site. These boring logs <br /> and legend are attached within this report. The shallow percolation test holes were drilled with a <br /> four(4) inch hand auger, and the deep geotechnical borings were drilled using a Mobile B-53. <br /> Essentially the soils of the percolation test boring were composed of brown silty sand to a depth <br /> of 3 feet. The boring logs of the deeper geotechnical borings indicate the deeper soil consist of <br /> alternating layers of stiff to very stiff clayey/sandy silts, silty/sandy clays, and silty/clayey sands <br /> to the maximum depth of exploration of 40 feet. Plate 1 identifies the location of the percolation <br /> test and the deep geotechnical borings B-1 and B-2 (see Plates 10, 11, and 12 for the boring logs <br /> and the boring log legend). <br /> The percolation test utilized 2-inch 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 /> r <br /> p*r�w <br /> r <br />