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PUBLIC HEALTH SERVICES o ,N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 D <br /> BUTCH SCHMIDT <br /> STOCKTON UNIFIED SCHOOL DISTRICT (SUSD) JUL 01 1999 <br /> 1932 EL PINAL DRIVE <br /> STOCKTON CA 95205 <br /> RE: EDISON HIGH SCHOOL SITE CODE: 1040 <br /> 1425 S. CENTER STREET <br /> STOCKTON CA 95206 <br /> q <br /> h <br /> A 10,000-gallon diesel underground storage tank (UST) was removed at the above referenced site in <br /> November 1990. The analytical result of the soil sample taken at 12.5 feet below surface grade (bsg) <br /> below the north end of the UST was 290 parts per million (ppm) of Total Petroleum Hydrocarbon as <br /> diesel (TPH-d). The analytical result of the soil sample taken at 14 feet bsg below the center of the UST <br /> } was 430 ppm TPH-d. Two Geoprobe soil borings were advanced in the area of the former UST to <br /> 1 approximately 30 feet bsg and 31 feet bsg, respectively, on February 16, 1999. <br />: 1 San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD) has reviewed <br /> Summary Report of Additional Subsurface Investigation dated June 2, 1999 prepared by ATC Associates, <br /> Inc (ATC). The highest concentration of petroleum hydrocarbon contaminants expressed in the <br /> analytical results of soil samples were 7.9 ppm of TPH-d taken at 15 feet bsg at the center of theformer <br /> UST excavation. Aromatic hydrocarbons (BTEX) were non-detect at above detection limit in any of <br /> the soil samples. Methyl tert-Butyl Ether(MTBE) was not analyzed for. Depth to groundwater in the <br /> area is approximately 30 feet bsg; however, groundwater was not encountered during advancement of <br /> the two soil borings. <br /> PHS/EHD agrees with the report's conclusion that additional investigation is not warranted. Heath& <br /> Safety Code§ 25299.37.1 requires testing for MTBE at all underground storage tank sites, including <br /> diesel and waste oil tanks, before a local agency or Regional Water Board may issue a closure letter f <br /> pursuant to chapter 6.75 of division 20 of the Health and Safety Code. In order to comply with this <br /> requirement PHS/EHD recommends the chromatograph of the soil sample analyses included in the <br /> report be read and interpreted for the presence of MTBE. <br /> f <br /> If you have any questions,please feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> Jeffrey , REHS <br /> J Y Won g Margaret Lagorio,REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> C; RWQCB, Central Valley Region-Mark List <br /> C: ATC Associates Inc. - Tom Lutterman <br /> i <br /> A Division of San Joaquin County Health Care Services <br />