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_ r <br /> 18 February 1992 <br /> (GeoAudit CV 55-59 E2--1.32) <br /> Page 3 of 3 <br /> i[[ sample SS-1-30 is rather <br /> diesel concentration of 1300 ppm <br /> surprising; no odor was evident in this Sam <br /> pmeter. n the iEieldof <br /> only 1 ppm was obtained on the organic vapor <br /> CONCLUSIONS <br /> Field and laboratory investigations indicate that lessethan <br /> sel <br /> contaminated soil extends to a vertical depth of is still <br /> 20 ft at the west end of the vault {SB-2) • but is <br /> present at this depth at the east end of the vault, and <br /> diminishing. Plotting contamination dr levels <br /> ll depths verssuggestsus h that <br /> present <br /> extrapolating out beyond p not be present below <br /> about 2 2 intia f t (Figure ure 3)n at thea This would be approximately 40 ft above the <br /> about <br /> water table. <br /> We recommend that a copy of this report be sent to Ms. Linda <br /> l <br /> Turkette at the Environm Dunt <br /> of <br /> vices of San Joaquin C for rev ewlnPublic Health <br /> ntal He <br /> andcosment EHpwill <br /> SerY <br /> determine lacethcr whether further ontaminatlassessment on must be is tCan be <br /> necessary <br /> left 1 p <br /> If you have any questions or comments, please do not hesitate to <br /> contact our office. <br /> Sincerely, <br /> GEOLOGICAL AUDIT SERVICES, INC. <br /> Victor B. Cherven <br /> Project Geologist <br /> Registered Geologist #3475 <br /> Enclosures ��• <br /> M.3475 <br /> •� <br /> CFC� <br />