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r <br /> PUBLIC fiEALTH SERV'ICESVI <br /> aPqu�nr• c <br /> SAN JOAQUIN COUNTY <br /> 2' '•Z <br /> ENVIRONMENTAL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 952 2 �...... <br /> 209/468-34200 <br /> OLIVIA TRAINA EST. AND JOAN BARNES 3'` - <br /> 1215 CAMINO RAMON <br /> SAN JOSE CA 95125 <br /> RE: Traina- Barnes Farms SITE CODE: PR506388 <br /> 29900 MacArthur Drive <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the November 18, 1996 Harding Lawson Associates report entitled "Phase I Preliminary <br /> Site Assessment and Limited Phase II Site Investigation Traina Property APN 253-210-15 San <br /> Joaquin County , California". PHS/EHD has determined that the site investigation of contamination <br /> resulting from an unauthorized release from the farm tanks removed from this site in 1990 has <br /> been completed. <br /> Results from the subsurface investigation in the area where the former farm tanks were located <br /> indicate the presence of petroleum hydrocarbons as diesel at a maximum concentration of 13,000 <br /> ppm and toluene, ethyl benzene and xylene (TEX)at just above detection limits. The complete <br /> lack of detectable benzene and the low levels of TEX indicate that the leak was primarily from the <br /> former diesel UST. The maximum depth of the contamination did not exceed 40 feet. Depth to <br /> groundwater at the site is approximately 60 feet. <br /> Diesel is not a known human carcinogen and clean up of diesel plumes is driven by taste and <br /> odor thresholds in groundwater drinking water supplies. Diesel is not very mobile in the <br /> subsurface soil environment and usually does not migrate far from the source. The risk to human <br /> health and the environment from the residual diesel contamination does not appear to require <br /> cleanup measures at this time. <br /> Please be advised that PHS/EHD requires notification prior to any changes in land use or <br /> excavation activities in the area of the former farm UST. <br /> i <br /> For additional information please contact Steven Sasson at(209)468-3459. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Seven WSasson, Senior REHS Margare agorio, REHS - <br /> Site Mitigation Unit Supervisor <br /> cc: Wendy Cohen, CVRWQCB <br /> A Division of San Joaquin County Health Care Services <br />