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PUBLIC HEALTH SERVICES <br /> SAN j0AQ <br /> Y'Vil KHANNAMD.M P H <br /> 14%w Hol,,h Officer <br /> P.0, Box 2009 1601'East Hazetton Avenue) Stod- on,Calif ormia 95201 i <br /> (209)468-3400 <br /> CHEVRON USA INC <br /> P 0 BOX 1666 <br /> , tMAR 17 '199 <br /> L! 42 <br /> CONCORD CA 94524 , <br /> 13 <br /> RE: Stockton Airport REPLY TO SITE CODE: 184S <br /> 5000 S. Airport Way <br /> Stockton, CA 95206 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has recently reviewed the analytical results <br /> of the soil samples taken from beneath the underground storage <br /> tanks that were removed from this site during the periods of <br /> 1987-1990. <br /> Although the laboratory results from each tank removal indicated <br /> no detection of volatile organic hydrocarbons, the detection <br /> limits cannot be applied to current standards. (see chart below) <br /> Current standards, laboratory detection limits, and the site <br /> specific characteristics (i.e. depth to seasonal high <br /> groundwater, nearby wells, septic systems) make it impossible for <br /> PHS/EHD to evaluate these tanks for closure. <br /> According to the Leaking Underground Fuel Tank (LF T) field <br /> 'manual (February 1989) detection lirdits for soil analysis are <br /> .005 ppm for volatile hydrocarbons and 10.0 ppm for total <br /> petroleum hydrocarbon. <br /> If site closure certification is necessary, PHS/EHD would not be <br /> able to provide it without further investigation of the 8 <br /> underground storage to removal sites listed below. However, <br /> PUS/ZHD is not, at this timeo requesting further investigation of <br /> these specific tank locations. <br /> 121_7-Sa 9MLrAAt-j-L-U-x-Tj- <br /> Benzene .2 ppm .005 ppm <br /> Toluene .2 ppm .005 ppm <br /> Xylene .2 ppm .015 PPM <br /> A DM5f0n0fUnJ0a9UwnC�mMyHm1th Care iervictm 10 <br />