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• y <br /> PUBLIC )qEALTH SERV'"10' CES <br /> SAN JOAQUIN COUNTY r. <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 FILE COPY <br /> CRAIG OGATA <br /> SAN JOAQUIN COUNTY FACILITIES MANAGEMENT <br /> 222 E WEBER RM 675 JUL 17 '1998 <br /> STOCKTON CA 95202 <br /> Re: Agricultural Commissioner's Office Site Code: 1793 <br /> 503 East Tenth Street <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed the "Site Investigation Report" dated January 23, 1998, <br /> and the "Wo rkplan-Monitoring Well Installation and Quarterly Groundwater <br /> Monitoring" dated July 1,1998 which were prepared by Ramage Environmental <br /> for the above referenced site, and has the following comments for your <br /> consideration and action. <br /> Three 1,000-gallon underground storage tanks (UST's), associated piping and <br /> dispenser island equipment were removed from the site in October, 1988. The <br /> "Site Investigation Report" presented the results of the investigation in which <br /> twelve soil borings were advanced on site on December 19 and 22, 1997. Soil <br /> samples and groundwater grab samples were collected from each boring. <br /> Selected soil samples and eleven of the groundwater grab samples were <br /> submitted for analysis for total petroleum hydrocarbons (TPH) as gas; TPH as <br /> diesel; benzene, toluene, ethylbenzene, xylenes (BTEX) and methyl tertiary butyl <br /> ether (MTBE). Two groundwater grab samples were also analyzed for all <br /> oxygenate compounds by EPA Method 8260. The results of the soil analyses <br /> indicate that the main concentration of hydrocarbon contamination in soil is in the <br /> immediate vicinity of the former UST's location, and is defined to a vertical extent <br /> of twelve feet. All groundwater grab samples evidenced some level of <br /> hydrocarbon contamination, with the highest concentrations in the area of the <br /> former UST's. The apparent groundwater gradient is north to north-east, which is <br /> common for that area of Tracy. <br /> The "Workplan" describes the recommendations by Ramage Environmental for <br /> the installation of a network of groundwater monitoring wells to monitor the <br /> concentration and migration of the plume of impacted groundwater. <br /> A Division of San Joaquin County Health Care Services <br />