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April 9,2007 <br /> NOA Project Number: E07045A <br /> Soil Name Depth Unified Soil Classification Salinity Soil perme- Septic tank <br /> and Map (in) mmhos/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> SanJoaquin 0-12: Loam;CL-ML,ML <2 5.6-6.5 0.6-2.0 Severe: <br /> loam,thick 12-26: Sandy clay loam;SC <2 6.1 -7.3 0.2-0.6 cemented <br /> surface, 26-35: Clay loam,clay-,CL <2 6.1 -7.8 <0.06 pan,peres <br /> 0-2% 35-60: Indurated --- — --- slowly <br /> slo es,240. <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> V A.1 Soil Boring Locations <br /> A total of two soil borings were advanced on the site, one boring to a depth of approximately three <br /> feet and one boring to a depth of around 12 feet. The shallow soil boring was later used for a <br /> percolation test hole;the locations of the percolation test is indicated in Plate 1. <br /> L /5.2 Soil Boring Dimensions <br /> LThe soil borings were 12 feet or three feet deep, as noted above, and were four inches in diameter. <br /> ,5.3 Soil Lithology Observed <br /> LGenerally,the soil encountered in the boring is similar to the soils reported by the San Joaquin <br /> County Soil Survey for the area (USDA, 1992). Table 3 presents the representative soil log for the 12 <br /> f foot deep soil boring. Conditions were comparable in the shallow hole. <br /> Table 3. <br /> Soil Boring Log. <br /> Depth Interval (ft) Soil Type Unified Soil Classification <br /> 3-5 Brown,silty clay CL <br /> �. 5-8 Light brown,silty clay,hardpan CL <br /> 8-12 Reddish brown,sandy silt with clay SM <br /> V <br /> LX5.4 Discussion of Soil Lithology <br /> A visual inspection of the soils from on-site drilling indicates limited potential for percolation <br /> ` because of the silty nature of the soils. A percolation test is the best method to determine the <br /> Lsuitability of the soils. Please see the next section for percolation test results. Generally speaking, <br /> coarser-grained soils have much greater potential for percolation than fine-grained or cemented <br /> Lsoils. <br /> 6 '.'44 <br /> L <br />