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August 14,2001 <br /> Job Number: LGOI-244 <br /> Page 5 <br /> -_ The surface and near surface soils located on the site are reported to be the Jacktone <br /> (clay) Urban land complex (Plate 6). The Soil Survey of San Joaquin County describes the <br /> Jacktone Urban land complex as"...50 percent Jacktone clay and 35 percent Urban land. The <br /> _ components of this unit occur as areas so intricately intermingled that it was not practical for <br /> separate mapping. The soils are moderately deep to a hardpan and somewhat poorly drained soil. <br /> It formed in alluvium derived from mixed rock sources. Permeability is slow in the Jacktone <br /> soil. The shrink-swell potential is high. On sites for septic tanks, the slow permeability can be <br /> overcome by increasing the size of the absorption field."' Table 4 presents an excerpt of some <br /> selected engineering properties for soils located on the subject property. <br /> Table 4. <br /> Selected soil properties of the Jacktone Urban land complex. s <br /> Soil Name and Depth(in) Unified Soil Salinity Soil Septic tank <br /> Map Symbol Classification mmhos/cm Reaction absorption <br /> PH fields <br /> Jacktone- 0-22: Clay. CL,CH <2 6.6-8.4 Severe: <br /> Urbanland 22-34:Clay loam,clay, CL,CH <2 7.9-9.0 cemented pan, <br /> complex, 0 to 2 silty clay. too clayey, <br /> percent slopes, 34-37: Indurated. hard to pack. <br /> 181. 37-46: Loam,clay loam. CL-ML,CL <2 7.9-9.0 <br /> 46-60: Cemented. — <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> Five(5) percolation test holes were drilled by Neil O. Anderson &Associates, Inc., to <br /> characterize the soils near the location of the two (2) known existing septic systems. Three (3) <br /> percolation test holes and one (1) soil profile boring were drilled behind the office structure. Two <br /> (2)percolation test borings and one (1) soil profile boring were drilled behind the home. Each <br /> area was evaluated by the percolation test to determine soil suitability. No ground water was <br /> encountered in any of the borings. Generally, soil mixtures of clayey sand and silty clay were <br /> encountered. TablgS-presents-the-log-of the�Ii�fgt�4 soil boring. <br /> I\ <br /> ko <br /> 3 USDA Soil Conservation Service, 1992,1 Survey of San Joaquin County,California, Sheet 19. <br /> �r10 <br /> 1 <br /> T <br /> p 4 <br />