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i <br /> 1 <br /> B4 B1 <br /> ' ? CL _ — — — CL ? <br /> 1 <br /> 10 - <br /> ML Tank Excavation ML <br /> 20 - <br /> ' <br /> 30 �v CL ? <br /> 1 <br /> 4a ? <br /> L <br /> 50 �_ f— —SP ? <br /> 1 <br /> TD-50D - - - � r'J?f f —CL ? <br /> 1 6a _ <br /> ? ~SM - ? <br /> 70 2-- CL ? <br /> ' 80 - <br /> TD-865 <br /> aTD-865 <br /> ' 90 <br /> KEY LEGEND <br /> = Estimated zero line of CL = Silty clay <br /> soil contamination <br /> ' ML -- Clayey silt/Fine sandy silt <br /> 111 <br /> = Soil Boring Sample <br /> 5P = Sand, poorly graded <br /> TD = Total Depth <br /> ' SM = Silty sand <br /> ' 0 5 10 15 20 <br /> Scale in Feet <br /> ® CROSS SECTION B - B' WKA NO 2307 02 <br /> 1444 MARIPOSA ROAD DATE 12/93 <br /> WALLACE • KUHL Et ASSOCIATES, INC <br /> GEOTECHNICAL ENGINEERING Stockton, California EXHIBIT 4 <br /> GEOLOGIC R ENVIRONMENTAL SERVICES <br />