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I ` <br /> PUBLIC HEALTH SERVICES oR�Ur� <br />' SAN JOAQUIN COUNTY w �� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M D , M P H , Health Officer <br />' 304 East Weber Avenue, Third Floor • Stockton, CA 95202 LrFpa� <br /> 2091468-3420 <br /> COPY <br /> CRAIG OGATA <br /> SAN JOAQUIN COUNTY FACILITIES MANAGEMENT' JUL 1 X98 222 E WEBER RM 675 <br /> STOCKTON CA 95202 <br />' Re Agricultural Commissioner's Office Site Code 1793 <br /> 803 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 "Workplan-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 /> 1 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 /> • <br />' A Division of San Joaquin County Health Care Services <br />