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��� `z �.. +�,✓* war' .�� wf"` x3.J+k o '� a p'a Z�-� a�. <br /> u <br /> a <br /> o- <br /> .a <br /> S <br /> d <br /> 22 <br /> GOLDEN GRAIN COMPANY <br /> December 21, 1989 <br /> . 202/799-5045.06 <br /> is <br /> at <br /> e has <br /> Based on the results of <br /> flthe SVS,on f�hydrocarbonsyathlevelsrabave <br /> been any off-site contr <br /> the clay- <br /> 4.2 SOIL coNDITIONS <br /> Details of subsurface geology are illustrated on three <br /> geologic cross sections (Figures 6 and 7) . The materials <br /> encountered during drilling consist depth <br /> of a saoeata zone <br /> dark- <br /> encountered <br /> silty, well-graded sand from the surf <br /> about 8 feet. A llghter-ccoarser <br /> belawsand <br /> the dark brown sand. <br /> thin <br /> layers of sandy silt was encountered <br /> A clay unit about 4 feet thick was observed at a depth of about <br /> 25 feet in some of the wells, corresponding with the clay uiiit <br /> reported in several of the drill logs compiled by SCS Engineers. <br /> -brown, well-graded sand unit, <br /> Below the clay unit lies a light <br /> t <br /> usually at least 20 feet thick, that locally contains rounded <br /> gravels and pebbles al: depths of about 45 feet. in wells MW-10, <br /> MW-12, MW-13, and MW-14, a clay unit was encountered at approxi- <br /> mately 48 feet below the sur=ace. <br /> No BTEX, TPH-�G, organic lead, EDB,-or TPH as jet fuel was <br /> les from <br /> detected in any- of the analyzed soil sampf the SVS and <br /> through <br /> MW-14. These .results, combined with the results of t <br /> SCS, indicate that <br /> the previous soil analyses performed by <br /> although the hydrocarbon plume in soil extends 50 to he feet out <br /> ` . <br /> from the tank pit area, a zero line has been established. A <br /> summary of soil analysis results is shown in Table 2' copies <br /> slof <br /> laboratory reports of the analyses are presented in Appendix <br /> GiiouNW I�ATIM <br /> ry� <br /> S FEMNOLOGY.IW- <br />