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PUBUC HEALTH SERVICES <br /> -SAN i0AQ1]N COL'NIF'� <br /> i% <br /> IOU KHANNA\11) [P H <br /> P.O. Box 2009# 1601 East itisAvenue) 0 Stockton,CatUbmia 95201 <br /> (209)468-3400 <br /> CAROL SHIRE <br /> VALLEY SYSTEMS <br /> P 0 BOX 626 MAR 1 .7 1992 <br /> STOCKTON CA 95201 <br /> RE: Stockton Airport REPLY To SITE CODE** 1845 <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/or 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 (LUFT) field <br /> manual (February 1989) detection limits 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 tank removal sites listed below. However, <br /> pus/mw is not, at this time, requesting further investigation of <br /> these specific tank locations. <br /> R-01-00-t-1-04-kim-It-c-h-mut <br /> 1212--se gu <br /> Benzene .2 ppm .005 ppm <br /> Toluene .2 ppm .005 ppm <br /> Xylene .2 ppa .015 ppm <br />