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-January 12; 2007 - NOA Project Number: E06157A Table 2. San Joaquin County Soil Survey _ - Selected Soil Properties of On-Site Soils. Soil Name Depth Unified Soil Classification Salinity Soil Perme- Septic tank and Map (in) _ mmhos/cm Reaction ability absorption Symbol = pH (in/hr) fields Montpellier- 0-20- Coarse sandy loam;SM <2 5.6-7.3 2.0-6.0 Severe:peres Commeta 20-43 Sandy clay loam;SC <2 5.6-7.3 .2-.6 slowly �1 complex,8- 43-55 Coarse sandy loam;SM <2 6.6-7.3 .2-.6 15%slopes, 55-60 Sandy.loam,coarse,sandy <2 6.1-7.3 <.06 200 - loam;SM . Note:The table descriptions do not necessarily reflect site-specific soil properties. 5.1- _ Soil Boring Locations .:A total of 2 soil borings were advanced on the-Site. One boring was drilled to a depth of three and a half feet. One boring was drilled to a depth of 25 feet. The soil borings were later used for the percolation test holes;the locations of the borings are indicated in Plate 1. �5.2 Soil Boring Dimensions One boringwas drilled to a depth Of three and a half feet. One boring was drilled to a depth of 25 p feet. Both borings were four-inches in diameter �=� ✓ 5.3 Soil Lithology Observed E Generally, the soils encountered in the borings were similar to the soils reported by the San Joaquin _ = County Soil Survey.for the area (USDA, 1992).Table 3 presents a representative soil log for the deep soil borings. Conditions were comparable in the shallow boring holes. Fl. = _ Table 3. Soil Boring Log for Parcel 2. - Unified Soil Classification ' Soil Type Depth Interval(ft) = yp 0-10 Reddish tan moist silty clay CL - 10-25 Brown moist silty sand SM 5.4Discussion of Soil Lithology A visual inspection of the shallow soils from on drilling indicates potential for percolation because of the sandy nature of the lower soils. A percolation test is the best method to determine the suitability of the soils for a septic disposal area. Please see the next section for percolation test a 5