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July 5,2002 <br /> Job Number: L602468 <br /> Page S <br /> The surface and near surface soils located on the site are reported re to e th <br /> p b e.urban land <br /> complex-(Plate 7). The Soil Survey of San Joaquin County describes the urban land complex as <br /> consisting of closely built-up areas in cities. This area is defined as having more than 85 percent <br /> of the surface covered by development. This area is not studied by the San Joaquin' County Soil <br /> Survey and no information regarding the-on site soil was available for the site. <br /> - A three (3).foot and 25 foot.deep'soil boring was drilled byNeil'O. Anderson&• <br /> Associates, Inc., on June 3, 2002,to characterize the soils near an existing septic system disposal <br /> - field as per the requirements of Sari Joaquin County Environmental Health Division. The two (2) <br /> borings were separated by about five (5) feet•of distance. No ground water was encountered in <br /> the borings. .Generally, silty and clay soil mixtures were present froin the ground surface to 22.5 <br /> feet deep.•Between 22.5 feet and 25 feet, a fine to medium sand with small amounts of silt was <br /> present. Table 4 presents the log of the 25-foot soil boring. <br /> Table 4. <br /> 25-foot Soil Profile Log. <br /> feet <br /> 'Depth p (feet) Soil <br /> 0-1 Brown clayey silt with fine sand. <br /> �- 1-8 Dark.brown silty clay with fine-to medium sand. <br /> 8-13.5 . Same.but with greatersilt content with depth. <br /> 13.5-22.5 Medium broom silty clay. <br /> A , <br /> 22.5-25 Brown fine to medium sand with small amounts of silt. . <br /> A <br /> A shallow and deep percolation test(permitted by the County) was performed.in each <br /> 'boring (Plate 1). A three (3)foot deep soil boring was drilled,next to the 25 foot soil boring. <br /> The soils of the shallow boring to a depth of three(3) feet were found to be the same.as the deep <br /> boring <br /> For each percolation test, a two (2) inch PVC pipe'with holes drilled on the bottom was <br /> place in each hole. Two-(2) inches of"pea gravel"was placed in the bottom of hole, the casing <br /> . was installed, and several feet of"pea gravel"was backfilled in the annular space. The - <br /> percolation holes were pre-soaked and a short preliminary test was conducted on June 3, 200.2 to <br /> ` determine whether a one (1) hour or.four(4)hour test was required. Based on a preliminary test, <br /> r ti <br /> z <br /> O A <br /> F <br /> .- .. - -. _ r _ - SSS G��• <br />