SU0009708 SSNL - Laserfiche WebLink

Home Browse Search

Soil Profile and Geologic Information The Site is depicted on the Preliminary Geologic map showing Quaternary deposits of the Lodi Quadrangle, California (Marchand and Atwater, 1979). The Site is depicted within a map unit of the Modesto Formation upper member. The unit represents "foothill-derived alluvial silt, clay and minor sand following distributaries across lower fans-, abundant volcanic detritus" (Plate 7). The surface and near surface soils located at the Site are reported by the USDA Web Soil Survey to be composed of Jacktone clay, 0 to 2 percent slopes (Plate 8) (USDA, 2013). The table below presents some selected properties of this soil.- Table 1. Selected Properties of On-Site Soils (USDA, 1992) Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank and Map Reaction ability absorption Y S mbol (in) Classification mmhoslcm pH (in/hr) fields Jacktone 0-22 Clay; CL, CH <2 6.6-8.4 0.06-0.2 Severe: clay, 0-2% 22-34 Clay loam, clay, silty <2 7.9-9.0 0.06-0.2 cemented slopes, clay; CL, CH pan, peres 180 34-37 Indurated --- --- --- slowly 37-46 Loam, clay loam; CL- <2 7.9-9.0 0.2-0.6 ML, CL 46-60 Cemented --- Note:The table descriptions do not necessarily reflect site-specific soil properties. *See description of the map unit for composition and behavior characteristics of the map unit. Soil Borings Live Oak performed two percolation tests for the Site because the desired septic system location changed after the first test watwile) be discussed in the following sected. The new system is doo be located near test P2. Both percolation tests On October 2 and November 15, 2013, Live Oakexcavated llow and borings d eep soil pose of conducting percolation tests. The were .2) borings on the Site for the pur four inches in diameter, 3.23, 3.25, 9.23, and 18.70 feet deep, and were excavated by (5-. 0 hand auger. The locations of the borings are indicated on Plate 9. �SIJ f what would e anticipated ase The soil in the borings was within the range oeblocation (P1) b silty cdlay was on the Soil Survey data reviewed. At the southern percolation test encountered to a depth of 2 feet, followed by i h ssandilt was encountered for thy and clayey, e remainder sand to a depth of seven feet. Fine to medium sand clay, silty clay, and sandy, of the boring. At the northern percolation test location (P2), silty clay were encountered to a depth of 14 o eet, areowepresented by san Plates ndy silt or and the remainder of the boring. The logs for the soil g 11. Page 5 LOGE 1325