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.` <br /> SECTION 4 <br /> INVESTIGATIVE RESULTS <br /> GEOLOGIC PRO►ME <br /> The site is underlain by heterogeneous soils. No bedrock was encountered in any of <br /> the borings; all borings were drilled to a depth of 25 feet. Soil-boring logs are included <br /> in Appendix B. Soil Borings SB-01 (MW-1) and SB-02 (MW-2) encountered similar <br /> ` soil-types,with the exception of the bottom five fast in SB-01. Both borings encountered <br /> a thin, clayey sand new the surface (just underneath the surface asphalt). This was <br /> underlain by a black, plastic clay, followed by a slightly plastic, brown sandy clay to a <br /> depth of 8 feet. Both borings then encountered a dark brown to brown clay with <br /> 4. M, moderate plasticity and a minor amount of sand and gravel. This soil-type persisted to <br /> the total depth of the SB-02 boring. However,the bottom five feet in SB-0I was a very <br /> distinctive gray to bluish-greenish clay that was very plastic. This clay is known in the <br /> San Joaquin County area as "Stockton Blue". <br /> Soil boring SB-03 encountered a much different soil profile. The uppermost 2 feet, <br /> directly below the asphalt,was a similar brown to black sandy clay as that found between <br /> 2 and S feet bgs in SB-01 and SB-02. However, SB-03 encountered a poorly sorted, <br /> quartzose brown sand down to 12 feet. This sand was consistently the coarsest material <br /> logged in any of the soil borings. Below 12 feet, SB-03 encountered a brownish-gray, <br /> clayey sand (slightly more consolidated than sand above), and then a moderately plastic <br /> brown clayey sand from 18 feet bgs to the total depth. <br /> HYDROLOGIC CONDITIONS <br /> Groundwater was encountered in all d= soil borings at a depth of approximately 15 <br /> feet while drifting. Water was found in the moderately plastic, brown clay in SB-01 and <br /> 4-1 <br /> 273-07AS 4124191 <br />