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PUBLIC HEALTH SEAKES OP�U N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> C P <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 gctddn <br /> 209/468-3420 00 <br /> MIKE CARTER `• 4 icQ <br /> ESCALON UNIFIED SCHOOL DISTRICT <br /> 1520 YOSEMITE AV <br /> ESCALON CA 95320 <br /> RE: BUS GARAGE <br /> 1176 YOSEMITE AV; ESCALON <br /> FORMER UNDERGROUND STORAGE TANKS <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has recently re-evaluated the analytical results of the soil and water <br /> results taken from beneath the underground storage tanks (USTs) that were removed <br /> from this site on August 2, 1989 and June 14, 1994. The following conditions <br /> continue to exist at the above site: <br /> August 2, 1989 - Tank #1496-01 <br /> One 10,000 gallon diesel UST was removed this date; one grab water sample from <br /> the tank excavation and 2 soil samples were collected from beneath the tank. The <br /> depth to groundwater has been documented at 60 feet bgs. The grab water sample <br /> is not representative of groundwater, and may have been from localized irrigation. <br /> No benzene, toluene, ethyl benzene or xylene (BTEX) was detected; Total petroleum <br /> hydrocarbons as diesel (TPHD) were detected at 550 milligrams per kilogram (mg/kg) <br /> at 14 feet below grade surface (bgs). <br /> June 14, 1994 - Tank #1496-02 and Tank #1496-03 <br /> One 2,000 gallon diesel/gas UST (#1496-02) was removed and 2 soil samples were <br /> collected from beneath the tank. At 13.5 feet below grade surface (bgs), 27 <br /> micrograms per kilogram (ug/kg) of xylene was detected with all other BTEX analytes <br /> nondetected. Total petroleum hydrocarbons as diesel (TPHD) were detected at 440 <br /> milligrams per kilogram (mg/kg). <br /> One 1,000 gallon gas UST (#1496-03) was removed and 2 soil samples were <br /> collected from beneath the tank. At 12.5 feet below grade surface (bgs), 18 <br /> micrograms per kilogram (ug/kg) of xylene was detected with all other BTEX analytes <br /> nondetected. Total petroleum hydrocarbons as gasoline (TPHG) were nondetected. <br /> .4 Division of San Joaquin County Health Care Services <br />