SU0005930 SSNL - Laserfiche WebLink

Home Browse Search

August 29, 2006 NOA Project Number: E06084A ! I 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION The site is depicted on the Preliminary Geologic Map of the San Francisco - San Jose Cenozoic Quadrangle, as within a region of Quaternary Fan deposits. The unit consists of gravel, sand, silt and clay (Plate 3). The surface and near surface soils located at the site are reported by the San Joaquin County Soil Survey to be composed of the Capay clay,wet, 0-2% slopes and Vernalis clay loam, 0-2% slopes (Plate 4) Fj (USDA, 1992). Table 3 presents some selected properties of the soils: Table 3. ASan 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) rnmhos/ Reaction ability absorption Symbol cm pH (in/hr) fields Capay clay, 0-20: Clay: CH,CL <4 6.6- 8.4 0.06-0,2 Poor:too wet,0-2% 20-44: Clay,silty clay: CL,CH <4 6.6-8.4 0,06-0.2 clayey slopes,121. 44-60: Silty clay loam,clay loam;CL <4 6.6-8.4 0.06-0.2 Vernalis 0-9: Clay loam;CL <2 6.6-8.4 0.2-0.6 Severe:peres clay loam, 9-47: Loam,silt loam,clay loam;CL,Cl- <2 7.4-8.4 0.6-2.0 slowly wet,0-2% NIL �y slopes,269. 47-60: Stratified sandy loam to silty clay <2 7.9-8.4 0.6-2.0 jl loam;CL CL-ML Note:The table descriptions do not necessarily reflect site-specific soil properties. Fj 5.1 Soil Boring Locations CTw shallow borings and one groundwater boring were advanced on the Site. The percolation test b Ings were drilled to a depth of three to three and a half feet. The groundwater boring was drilled to a depth of 8.5 feet.The shallow boxings were used later for percolation test holes;the locations of the percolation test borings are indicated in Plate 1. 5.2 Soil Boring Dimensions The percolation test borings were approximately three and a half feet deep,as noted above, and / were four inches in diameter. 6