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SECTION 4 <br /> INVESTIGATIVE RESULTS <br /> GEOLOGIC PROFILE <br /> J <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-Dl (MW-2) encountered similar <br /> � pPe g (11'iW-1) and SH-D2 <br /> soil-types,with the exception of the bottom five feet in SB-01. Both borings encountered <br /> a thin, clayey sand near the surface {dust 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 /> k4 <br /> r moderate plasticity and a minor amount of sand and �n..,vel. This soil-type persisted to <br /> the total depth of the SB-02 boring. However, the bK'ttom five feat in SB-01 was a very <br /> YP distinctive gray to bluish-greenish clay that was very plastic. This clay is,known in the <br /> ' San Jaag aim County area.ds.„Stockton fB ' <br /> kk 14�a 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 /> -01 and SB-02. However, SB-Ga encountered a poorly sorted, <br /> 2 and 8 feet bgs in "�3 <br /> quartzose brown sand down to 12 feet, This sand was consistently the coarsest material <br /> i g 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 thele a moderately plastic <br /> brown clayey sand from 18 feet bgs to the total depth. <br /> HYDROLOGIC CONDITIONS <br /> Groundwater was encountered in all three soil borings at a depth of approximately iS <br /> feet while driiiing. Water was found in the moderately plastic, brown clay in SP-01 and <br /> 4-1 <br /> BY <br /> i `:.. 175-07.R5 4f24N1 <br />