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r <br /> PUBLIC HEALTH SERVICES <br /> P.O. Box 2109# 1601 East Hazelton lton .amu 5tml ton,California 95 201 <br /> 209)468-3400 <br /> FLYINGBRIDGEFORD SERVICE ' ;• <br /> NAPA COUNTY AIRPORTij MAR 12 <br /> NAPA CA 94558 <br /> E: Stockton Airport REPLY TO SITE CODE: 1845 <br /> 5000 S. Airport <br /> Stockton, CA 95206 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division ' ; candy reviewed the analytical results <br /> of the soil 'samples taken from beneath the underground o <br /> tanks that were removed fromthis site during the of <br /> 1987-1990 <br /> Althoughthe laboratory results from each tank removal indicated <br /> no detectionf `volatile organic hydrocarbons, the detection <br /> limits is cannot be applied current standards. (see chart below) <br /> Current standards, laboratory detection limits, and the site <br /> specific charac i tics (i.e. depth to seasonal high <br /> groundwater, nearbywells, septic systems) -make it impossible for <br /> PHS/Eo evaluate these tanks for closure. <br /> According to the LeakingUnderground Fuel Ta LUFT) field _ <br /> manual a 1989 ion limits for soil analysis are <br /> .005 ppm for volatile hydrocarbons an 10.0 for total <br /> petroleum hydrocarbon. <br /> If site closure certification is necessary, PHS/EHD would not <br /> able to provide it withoutfurther investigation of the <br /> underground storage tank removalsites listed below. <br /> PUS/EHD is not, at thisi investigation <br /> specificthese io <br /> ' i <br /> Benzene 005 ppm <br /> Toluenes .005 ppm <br /> Xylene .2 ppm ppm <br />