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PUBLIC-HEALTH SERVICES <br /> SAN JOAQUIN COUNTY ,Z <br /> ENVIRONMENTAL HEALTH DMSION ` <br /> Karen Furst, M.D., M.P.H., Health Officer ; �P <br /> 304 East Weber Avenue, Third Floor• Stockton, CA 95202 <br /> •209/468-3420 [� <br /> CITY OF TRACY MAY 0 S 1998 <br /> ATTN: PAUL VERMA <br /> 520 S TRACY BLVD <br /> TRACY CA 95376 <br /> RE: DELTA DISPOSAL Site Code: 2183 <br /> 99 SIXTH ST <br /> TRACY CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the work pian "Site Problem Assessment" dated April <br /> 10, 1998 prepared by Wright Environmental Services, Inc. <br /> There are two former underground storage tanks (USTs) in question, not one as <br /> described in the work plan. One 350 gallon diesel UST and one 500 gallon <br /> gasoline UST were removed without permission in 1985. Excavation where <br /> the former tanks were believed to be located was performed in May 1990, and <br /> analyses of the soil sample collected from the west end of the excavation <br /> indicated 18000 ppm of Total Petroleum Hydrocarbons as diesel (TPHd). <br /> PHS/EHD approves the work plan with the following conditions: <br /> 1) Advance the soil borings until at least two consecutive 5-foot intervals of <br /> clean soils have been reached based on organic vapor monitor (OVM) <br /> reading, field observation, and concurrence of PHS/EHD staff. Advancement <br /> of the soil borings will not stop at the uppermost groundwater bearing strata <br /> unless the conditions mentioned above are met. <br /> 2) Selection of soil samples collected from soil borings for analyses must <br /> include PHS/EHD comment and agreement. <br /> 3) In addition to testing soil and water samples for total petroleum hydrocarbons <br /> as gasoline (TPHg), aromatic hydrocarbons as benzene, toluene <br /> ethylbenzene, and xylenes (BTEX), and all oxygenate compounds including <br /> methyl-tertiary butyl-ether (MTBE), total petroleum hydrocarbons as diesel <br /> (TPHd) must be tested. <br /> A Division of San Joaquin County Health Care Services <br />