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PUBLIC HEALTH ERVICES <br /> SAN JOAQUIN COUN <br /> M': t <br /> ENVIRONMENTAL HEALTH DrVISION <br /> Karen Furst, M.D., M.P.H., Health Officer { �P <br /> 304 East Weber Avenue, Third Floor • Stoc ton, CA 95202- <br /> 209/468-3420 <br /> 5 209/468-3420 TILE C <br /> ERNEST J POMBO JR DEC 81998 <br /> P O BOX 805 <br /> TRACY CA 95378 <br /> RE: Pomba Ranch Property SITE CODE: 508110 <br /> 24100 S. Lammers Road <br /> Tracy CA 95378 <br /> San Joaquin County Public Health Services, E ivironmental Health Division <br /> (PHS/EHD) has reviewed the Soil and Groundwater Sampling Report, Pombo <br /> Ranch Property, which was prepared by M.J. loberdanz & Associates for the <br /> above referenced property, and has the followi ig comments for your <br /> consideration. <br /> On September 16, 1998, M. J. Kloberdanz & A sociates oversaw the <br /> advancement of eight push point soil borings a the above referenced property. <br /> The purpose of the work was to determine if th re have been soil and/or <br /> groundwater impacts as a result of farming act vities on site. Historically, two <br /> underground storage tanks (ane storing diesel fuel, the other gasoline) were <br /> located on the property. PHSIEHD was present to observe the grouting of the <br /> completed borings. <br /> Analytical results indicate that both soil and groundwater have been impacted by <br /> petroleum hydrocarbon contamination in the areas of the former underground <br /> storage tanks (UST). The report proposes another series of push point borings <br /> to further delineate the lateral and vertical extent of the contamination from each <br /> former UST area. <br /> Soil boring 8-3, located in one of the former tank pit areas, showed soil <br /> contamination at 10 feet below surface grade ( sg) of 480-parts per million (ppm) <br /> total petroleum hydrocarbon as gas (TPHg), 1 00-parts per billion (ppb) <br /> benzene, 3000-ppb toluene, 9200-ppb ethylbe zene, 26000-ppb xylene and <br /> 2300-ppb methyl tertiary butyl ether (MTBE). I he water sample from B-3 had <br /> 56-ppm TPHg, 3700-ppb benzene, 1200-ppb toluene, 2400-ppb ethylbenzene, <br /> 4000-ppb xylene and 1900-ppb MTBE. PHS/E D agrees that further <br /> investigative work needs to be done in this are . Vertical definition needs to be <br /> made in the tank pit area. Lateral definition needs to be made to the north and <br /> east of the former tank pit area. PHS/EHD recommends the installation of three <br /> groundwater monitoring wells to surround this area. <br /> A Division of San Joaquin Counry H th Care Services <br />