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PUBI Z HEALTH ICES a.. <br />SAI N JOAQUIN COUNTY a <br />JOG[ KHANNA 1f.U.. NKP H. � <br />Healy Officer <br />P.O. Box 2009 (1601 East Hazelton Avenue) * Stockton. CaLifomia 95201 <br />(209) 468-3400 <br />JOHN STROH <br />SAN JOAQUIN COUNTY <br />MOSQUITO ABATEMENT DISTRICT <br />5503 S AIRPORT WAY <br />STOCKTON CA 95206 <br />RE: San Joaquin County <br />Mosquito Abatement District <br />5503 S. Airport Way <br />Stockton, CA <br />(C(Opy <br />DEC 2 3 1991 <br />San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has recently reviewed <br />the results of the soil samples taken from beneath the underground storage tanks that were removed from <br />this site in April 1987. <br />PHS/EHD has been designated by the State of California Water Resources Control Board (SWRCB) as the <br />local agency overseeing the investigation of leaking underground storage tanks (UST). <br />Seasonal high groundwater for this site is twenty-five to thirty feet below ground surface. On April 8, 1987, <br />the soil sample taken at twenty-seven feet below ground indicates that total extractable hydrocarbons exist <br />at the previous ground water level or within five feet of it. According to the LUFT manual (guidance <br />document from SWRCB) further site investigation is needed. Contamination was also documented beneath <br />former tanks three and four. Total extractable hydrocarbons were detected even though the soil should have <br />been tested for total volatile hydrocarbons beneath these tanks. Further investigation of these areas are also <br />needed. <br />This is to notify you that an "Underground Storage Tank Unauthorized Release (l.M/ Contaminated Site <br />Report" has been filed pursuant to Sec 25180.7 of the Health and Safety Code and that the site has been <br />placed on our local contaminated site list. <br />Should you wish to mitigate the contamination documented at your site contact PHS/EHD. <br />If you have any questions contact Margaret Lagorio, Senior REHS, of my staff at (209) 468-3449. <br />Jogi Kha , .D., M.P.H. <br />Health r <br />urie A. Cotulla, RENS, Pro am anagen <br />nvironmental Health Division <br />LAC/ML:lb <br />A Division of Sea joaquin County Health Care Services "A AL. <br />i, _ <br />