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June 14,2005 <br /> NOA Project Number: E05066A <br /> Table 3. <br /> San Joaquin County Soil Survey <br /> lected Soil Pro erties of On-Site Soils. <br /> ` Soil Name Depth Unified Soil Classification i Perme- Septic tank <br /> and Map (in) mmhos/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> �. Tokay fine 0-19: Fine sandy loam;SM <2 6.1 -7.8 2.0-6.0 Slight <br /> sandy loam, 19-45: Fine sandy loam,sandy loam; 2 6.1 -7.8 2.0-6.0 <br /> 0-2% SM <br /> slopes,256. 45-60: Fine sandy loam,sandy loam, <2 6.1 - 8.4 2.0-6.0 <br /> coarse sandy loam;SM <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 5.1 Soil Boring Locations <br /> A total of one soil boring was advanced on the Site to a depth of about three and a half feet. The <br /> soil boring was later used as a percolation test hole;the locations of the boring is indicated in Plate <br /> 1. <br /> 5.2 Soil Boring Dimensions <br /> The soil boring was about three and a half feet deep, and was four inches in diameter. <br /> 5.3 Soil Lithology Observed <br /> Generally, 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 4 presents the soil log for the three and a half <br /> foot deep soil boring. <br /> Table 4. <br /> Soil Boring Log. <br /> Depth Interval(ft) Soil Type Unified Soil Classification <br /> 0-1 Reddish brown,slightly moist,clay with sand CL <br /> 1-3.5 Light brown,slightly moist,very sandy clay CL <br /> ` /5.4 Discussion of Soil Lithology <br /> A visual inspection of the shallow soils from on-site drilling indicates potential for percolation <br /> because of the amount of sand in the soils. A percolation test is the best method to determine the <br /> suitability of the soils for a septic system disposal area. Please see the next section for percolation <br /> test results. Generally speaking, sandy soils have much greater potential for percolation than fine- <br /> grained or cemented soils. <br /> 7 <br />