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U =� <br /> a , <br /> PUBLXI HEALTH SERVICES <br /> Health,Offi(er <br /> '.0. Box 2009 (X51 East Hazelton Avenue)0 Stockton.California 95201 <br /> ( 09)468-3400 <br /> MOBIL OIL <br /> SEVENTHMAR 17 1992 <br /> LOS ANGELES CA <br /> Stockton Airport REPLY TO SITE CODEZ 1845 <br /> 5000 S. Airport Way <br /> Stockton, CA 9520 <br /> San Joaquin County Public1 Services, Environmental Health <br /> Division recently reviewed the analytical results <br /> of the soil samples taken from beneath the underground storages <br /> tanks thatwere removed fromthis site during the <br /> 1987-1990. <br /> Although the laboratory s from each tank removal: indicated <br /> no detection of volatile organic hydrocarbons the detection <br /> limits cannot be applied current standards. (see chart below) <br /> current standards, laboratory detection limits, and/or the site <br /> specific charais ics (i.e. depth to seasonal high <br /> groundwater, nearby galls, septic system make it impossible for <br /> PHS/EHD to evaluate 'these tanks for closu <br /> According to the Leaking Underground 'Fuel Tank (LUFT) field <br /> manual a 1989) detection limits for soil analysis are <br /> .005 ppm for volatile hydrocarbonsand 10.0 ppm for total <br /> petroleum hydrocarbon. <br /> If site closurei. i .i x is necessary, PHS/EHD would not be <br /> able to provideit without further investigation the <br /> underground storage tank. removal sites listed below. <br /> pHS/mm is not, at thisiinvestigation of <br /> these specific tank locations. <br /> 1 <br /> Benzene .005 PPM <br /> Toluene ppm .005 ppm <br /> Xylene .015 ppm <br /> t <br /> C?MM)n sof San JON11in CoUntY HeWth Car SeVA <br />