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PUBLIC HEALTH SERVICES , cp <br /> SAN JOAQUIN Co `TY <br /> [OGI `HANNA \f D. ,%l.P H <br /> Health Of!lcer ' <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 044.i <br /> (209) 468-3400 <br /> SAN JOAQUIN COUNTY <br /> GENERAL SERVICES D <br /> 222 E WEBER ROOM 675 <br /> STOCKTON CA 95202 <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 /> tr 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, P-HS/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 /> PHS/EHD is not, at this time, requesting further investigation of <br /> these specific tank locations. <br /> Detection Limit Chart <br /> 1987-88 Current (LUFT) <br /> Benzene . 2 ppm . 005 ppm <br /> Toluene . 2 ppm . 005 ppm <br /> Xylene . 2 ppm . 015 ppm <br /> A Dwision of San Joaquin Counry Health(are services C j <br />