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Taber <br /> �. Quincy Engineering, Inc. Since 1954 <br /> November 26, 2003 <br /> 1 P2/399/245-4 <br /> Proposed construction also includes about 760±I.m. of new soundwall at the <br /> following locations. <br /> Soundwall Location <br /> �. No. 1 20±m it, Sta. 298 +50 ("RTE 99" Line) to <br /> 56.8fm rt, Sta. 302+24.2 ("NB OFF" Line) <br /> 19tm It, Sta 303+60 ("SB OFF" Line) to <br /> No. 2 21fm It, Sta. 307+20 ("RTE 99" Line) <br /> Both soundwalls are expected to be supported on cast-in-drilled-hole (CIDH) pile <br /> foundations. Soundwall No. 1 piles are expected to be 356 mm diameter with tips at <br /> .. about at depths from 3.1 to 3.4 m below profile grade. Soundwail No. 2 piles are <br /> expected to be 400 mm and 450 mm diameter with tips at about 2.8 to 3.2 m below <br /> profile grade. <br /> 2.2 PRIOR WORK <br /> It is our understanding the need for ADL evaluation was established by an ISA <br /> performed for the project. We have no information indicating the existence of other <br /> �.. possible hazardous materials pertaining the project site. <br /> Taber Consultants prepared a "Roadway Geotechnical Report" for the project <br /> dated May 29, 2003. <br /> 2.3 GEOLOGY <br /> The site is shown on published geologic mapping (CDMG "Geologic Map of the <br /> ►.. San Francisco-San Jose Quadrangle", scale 1:250,000, 1990) to be underlain by <br /> Holocene age dune and eolian sand and, at depth, by Pleistocene age Modesto <br /> Formation materials consisting of sand, silt and gravel. Subsurface exploration for <br /> Taber Consultants geotechnical report encountered materials consistent with the <br /> published mapping. Two general soils units are identified and considered significant to <br /> �- proposed ramp/embankment improvements and soundwalls. The first unit consists of <br /> existing fill materials that were placed during original construction, described primarily <br /> as silty sand, sandy gravel and sand. The second unit consists of underlying native soils <br /> consisting predominately of sand and silty sand/sandy silt with layers of clayey silt/silty <br /> clay. <br /> 2 <br />