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Problem Assessment Report November 20, 1990 <br /> Fire Engine Company No. 2, Stockton, California AGS 38009-2 <br /> also included on the Log of Barings and are summarized in Table 4. Field instruments such <br /> as the PID is useful for indicating relative levels of hydrocarbon vapors but do not detect <br /> the concentration of hydrocarbons present with the same precision as laboratory 2nalyses. <br /> The locations of soil borings in relation to pertinent site features and two geologic Cross <br /> constructed to show the stratigraphy beneath the site are depicted on the Northern Site <br /> Detail (Plate P-21). Cross section A-A' shows the geology beneath the site in the north- <br /> south direction and cross section(B-B')shows the geology in the west-east direction. Cross <br /> sections A-A' and B-B' are shown on Plates P-22 and P-23,respectively. The depths of the <br /> deposits in the following discussion are in feet below surface grade. <br /> From north to south, Geologic Cross Section A-A' (Plate P-22) shows silt logged from the <br /> ea bottom of borings B-8, B-1 and B-3, to 45 feet in boring B-8 and 40 feet in boring B-3. <br /> Above the silt, a 5-foot-thick lens of sand was logged in boring B-3 which grades to a silt <br /> in boring B-5. Above the sand layer in B-3 is 12-foot-thick clay deposit that extends from <br /> t� <br /> boring B-3 to B-8 and thins to a thickness of 5 feet in boring B-8. Between approximately <br /> 14 and 24 feet below grade in boring B-3 are silty sand and silt deposits that grade into a <br /> sand deposit in borings B-1 and 13-6. The sand deposit is 20 feet thick in boring B-1. Above <br /> the sand is a clay deposit that was logged across the site to the surface. <br /> 14 <br /> tiv <br /> App/red 4Ge0Sy.9terns ---- <br />