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4c, <br /> PUBLIC DEALTSERVIJ--CESH <br /> SAN JOAQUIN COUNTY �. ..o <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer - <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 . ``4 -.Fo_R��P <br /> 2091468-3420 � � <br /> DALE STEELE <br /> CALTRANS MAILED NOV 0 71995 <br /> PO BOX 2048 <br /> STOCKTON CA 95201 <br /> Re: Caltrans - Lodi Maintenance Station Site Code: 1363 <br /> 845 East Pine Street <br /> Lodi CA 95242 <br /> San Joaquin County Public Health Services, Environmental Health Division has <br /> completed review of the "Site Assessment Report" dated September 15, 1995 which <br /> was prepared by GeoCon. PHSIEHD has the following comments for your <br /> consideration. <br /> The assessment was conducted in order to determine the extent of the soil <br /> contamination detected at the time of the November 30, 1989 tank removal. Not only <br /> was soil contamination observed,by the PHSIEHD staff person on site, but their <br /> inspection report indicated that the tanks were in poor condition and rusted. The <br /> PHSIEHD staff person also indicated that there was wet soil clinging to the bottom of <br /> the tanks that had a strong hydrocarbon odor. A concrete slab was encountered <br /> n <br /> beeath the underground storage tanks at the time of removal, so no soil samples <br /> were collected from directly beneath the tanks. However, piping samples.were <br /> collected on December 1, 1989 which evidenced soil contamination of up to 92 ppm <br /> kerosene. Also, it should be noted that the volatile hydrocarbon detection limit was <br /> 201imes that which was industry accepted at the time of tank removal. <br /> Soil samples were collected beneath the slab under the former underground storage <br /> l <br /> tanks on May 2, 1990. Soil contamination was evidenced at approximately 11 - 12 <br /> feet below grade with the following concentrations detected. <br /> Tank Sample B T E X TPH-g TPH-d Kero Oil <br /> gas 1-east <.05 .08 .120 .840 NA <10 <10 <10 <br /> gas 1-west <.005 <.005 <.005 <.015 NA <10 <10 <10 <br /> diesel 2-east <25 110 44 240 1500 NA NA NA <br /> diesel 2-west <.005 <.005 <.005 =.023 <1 NA NA NA <br /> Note all sample results in mg/kg <br /> i <br /> B: Benzene E: Ethylbenzene TPM-g: Gasoline Kero: Kerosene <br /> T: Toluene X: Xylene TPH-d: Diesel NA: Not Analyzed <br /> A Division of San Joaquin County Health Care Services <br /> i <br /> , <br />