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--w <br /> `���� <br /> 3i <br /> I <br /> LVZ11iration of Soil anti Urourrd "'.."cr Fellitiary 19, 199t <br /> ,SUS 3$032 3 <br /> Unocal Station No. 6951, Stockton, �:alifarni'r <br /> I <br /> PHOTOIONIZATIOtT DE'T'ECTOR READINGS O:' SOIL SAMPLES <br /> II FROM BORINGS B-1 through B--5 i <br /> i I Unocal Service Station 110, c�381. jl <br /> 4707 Pacific Avenue <br /> Stocl.ton, California E <br /> Sample photoionization P.eadings, for Boring; <br /> Depth B-1 B-2 B-3 B-`t B-5 <br /> 0 0 0 0 0 <br /> I 10 0 4.2 0 ° 0 <br /> 15 0 8.0 020 G 49 <br /> 0 51 <br /> 0 15.1 0 0 115 1 <br /> G I 25 0 455 0 1 <br /> 0 235 0 3❑ 89 <br /> ` 30 0 203 0 423 62 <br /> 40 ❑ 90 0 86 128 <br /> 45 0 114 0 26 4:- <br /> Q Sample depth in feet below surface grade <br /> f volume <br /> Photoionization readings are in parts per pillion by <br /> referenced to isobutylene <br /> 0 SITE: GEOLOGY <br /> The sediments encountered beneath the site consisted predorninaiith of thick silt la%ers with <br /> 0 thinner layers of clay, silty clay, silly sand. and sand. The sediments ranged from light to dark <br /> olive, gray, and orange; pale olive, and fight gray. 'I'he sand and clay cotttertt of the silt ranged <br /> from 0 to 35 percent; the grain size of lite sand ranged from fine to coarse grained. <br /> t <br /> Cross sections A-A1 and 13•I31. sho".n on Plate P-3, show the distribution of setiunents <br /> beneath the site, based oil the logs of borings B-I through B-5. ']'Ile location of each cross <br /> section is shoo �n Plate P?. `Elbe nvo cross sections show that the lavers of clan, silty sand, <br /> # and sand, aic �,ctierally laterally discontinuous, however, a thin layer of silty sand <br /> `---A,000d GeOSystemS --------- -- — <br />