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1 <br /> Table 4: Soil Layer Information <br /> ' Bounda Classification <br /> Layer Upper Lower Soil Texture AASHTO Unified Soil Permeability Soil <br /> (Inches) (Inches) Class Grou Rate(in/hr) Reaction <br /> ' 1 0 13 Clay Silt-clay FINE- Max: 0.20 Max: 8.40 <br /> materials GRAINED Min: 0.06 Min:7.40 <br /> (more than 35 SOILS,Silts <br /> ' pct.Passing and Clays <br /> no.200), (liquid limit <br /> clayey soils 50%or more <br /> fat clay) <br /> ' 2 13 60 Clay Silt-clay FINE- Max: 0.20 Max: 8.40 <br /> materials GRAINED Min: 0.06 Min:7.40 <br /> (more than 35 SOILS,Silts <br /> pct.Passing and Clays <br /> no.200), (liquid limit <br /> clayey soils 50%or more <br /> fat clay) <br /> ' Boring logs (located in Appendix C) at the Site completed by Condor Earth <br /> Technologies,Inc. on October 3,2005 confirm that the soil from 2.5-15 feet below <br /> ' ground surface (bgs) is predominantly clayey in nature (silty, sandy, lean or fat clays). <br /> There are some small layers of sand, gravel, and silt interspersed throughout the Site but <br /> ' in general the Site is comprised of clay to at least 15 feet bgs. <br /> 5.3 General Hydrogeological Conditions <br /> ' The San Joaquin County Flood Control and Water Conservation District Lines of Equal <br /> Elevation of Groundwater map (2003) approximated the groundwater at this site to be at <br /> a depth of 20 feet below ground surface (bgs) and generally flows to the east. <br /> ' Groundwater directions over the last 70 years has had a reversal from westerly to easterly <br /> due to the agricultural overdraft of groundwater basin to the east of Stockton. The Site <br /> will use a public water source for both irrigation and potable uses. SUSD does not plan <br /> ' on using groundwater at the Site. <br /> ' 6.0 PROPOSED SCOPE OF WORK <br /> 6.1 Conceptual Site Model and Sampling Strategy <br /> ' The Site will be sampled in an attempt to gather as much data regarding the <br /> environmental complications involved with over 125 years of recorded human habitation <br /> on and near the Site. The proposed sampling plan includes: on Site sampling of soil for <br /> inorganic and organic constituents,soil gas sampling, and collecting background <br /> samples. Appropriate QA/QC procedures will be followed for each sample type. <br /> ' Due to safety concerns regarding site access sampling will occur with a uniformed SUSD <br /> police officer on duty at the Site at all times. <br /> ' PEA Workplan 13 <br /> Spanos Elementary School <br /> January 18,2006 <br /> 1 <br />