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PUBLIC HEALTH SERV ICES X�p <br /> SAN JOAQUIN COINTY % <br /> w: : e <br /> Jocf KHdNi\ A M. D . u. eH , <br /> Health Officer <br /> P.O. Box 2009 • ( 1601 East Hazelton Avenue) • Stockton, Callfomia 95201 r� ercw ` <br /> ( 209 ) 468-3400 <br /> SAN JOAQUIN COUNTY <br /> GENERAL SERVICES COPY <br /> 222 E WEBER ROOM 675STOCKTON 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 /> 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 /> 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 Divisum of San Joaquin Counry Hvalrh Care �rvic" C p <br />