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log 0. <br /> KEI-P88-0810-1 <br /> December 9, 1988 <br /> Page 2 <br /> recommended installation of six borings. The borings were to <br /> determine depth to water, shallow subsurface geology, and begin <br /> to determine the degree of contamination in soil. <br /> FIELD ACTIVITIES <br /> On November 21, 1988, six 81+ diameter borings (designated as EB1, <br /> E132, EB3, EB4, EB5 and EB6 on the attached Site Plan) were <br /> drilled at the site. The subsurface materials penetrated and the <br /> depths at which soil samples were collected are shown <br /> attached Boring Logs, in the <br /> The six borings were drilled to depths ranging <br /> feet. Ground water was encountered from 11 to from 12 to 13 <br /> Z2 feet beneath <br /> the surface. Two soil samples were collected from each hole <br /> beginning at a depth of five feet in each of the borings. The <br /> undisturbed soil samples were taken by driving a California- <br /> modified split-spoon sampler ahead of the drilling augers. The <br /> clean, 2+� by 4" brass tubes holding the samples were seale <br /> aluminum foil, plastic caps and tape, and stared in a cooled ice d with <br /> chest for delivery to a state certified laboratory. Drilling was <br /> stopped about two feet after intersecting the first water table. <br /> After the samples were collected, the borings were backfilled to <br /> the surface with a neat cement-sand slurry, <br /> ANALYTICAL RESUL'T'S <br /> All sampleswere analyzed at Sequoia Analytical Laboratory, <br /> Redwood city, California, and . were accompanied by properly <br /> executed chain of . custody forms. The soil samples from EB1 <br /> through EB-6 were analyzed for total petroleum hydrocarbon (TPH) <br /> as gasoline using EPA method 5030. or 3810 in conjunction with <br /> modified 8015 TPH as diesel by EPA methods 3550 in conjunction <br /> with modified 8015, and benzene, toluene, xylenes and <br /> ethylbenzene (BTX&E) using EPA methods 5030 and 8020. The <br /> results of the soil analyses are summarized in Table Z. Copies <br /> of the laboratory analyses and chain of custody forms are <br /> attached to this report. <br /> The analytical results of the soil samples from EB1, EB2 and EB3 <br /> borings show low to n�~n-detectable TPH and BTX&E, The samples. <br /> from EB4, EBS and EB6 stowed TPH as gasoline ranging from 16 to <br /> 360 ppm, TPH as diesel ranging from 40 to 2 900 <br /> ranging from non-detectable to 33 ppm. ` ppm and BTX&E <br />