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f s <br /> � w <br /> r <br /> PUBLIC HrALTH SERVIC'S <br /> SAN JOAQUIN COUNTY <br /> ' <br /> ENVIRONMENTAL HEALTH DIVISION '" ' ' <br /> �. ; <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 c9<;FoRN�P <br /> 209/468-3420 <br /> C (OMDY <br /> JAMES GIOTTONINI <br /> DIRECTOR OF PUBLIC WORKS <br /> CITY OF STOCKTONAU191 81999 <br /> 425 N EL DORADO lii7 <br /> STOCKTON CA 95202 <br /> RE: Weber Point Shell SITE CODE: 2436 <br /> 141 N EI Dorado <br /> Stockton CA 95202 <br /> The above referenced site has been a listed site with the San Joaquin County Public <br /> Health Services, Environmental Health Divisions (PHS/EHD) Local UST Oversight <br /> Program for oversight of assessment and clean up activities at contaminated underground <br /> storage tank sites since January 1991. It is the understanding of PHS/EHD that the City <br /> of Stockton Redevelopment Agency purchased this site in October 1998. As the owner of <br /> the property, the City of Stockton will be named as a responsible party. <br /> The referenced site is a former Shell service station facility. All gasoline underground <br /> storage tanks were reportedly removed in 1981. Beginning in 1993 the site underwent <br /> remediation by soil vapor extraction, groundwater oxygenation and groundwater <br /> extraction. Confirmation soil borings completed in 1996 indicated that the soil had been <br /> effectively remediated, and continued quarterly monitoring showed that concentrations of <br /> petroleum hydrocarbons in the groundwater had declined to near non-detect values. in <br /> May 1996 routine groundwater analysis for methyl tertiary butyl ether (MTBE) was <br /> initiated. Concentrations of MTBE have been increasing over time, most notably in the <br /> upgradient wells. Groundwater flow direction at this site is generally towards the east. <br /> It has been the consideration of PHS/EHD that the MTBE reported at this site is likely from <br /> an off-site source. A potential upgradient source is the former ARCO facility located at <br /> 205 N. Center Street. The ARCO facility was added to the contaminated site list in <br /> September 1998, following the detection of 52.4 parts per billion (ppb) of MTBE in a tank <br /> pit observation well. ARCO has begun an investigation of their contaminant plume, and <br /> currently has four groundwater monitoring wells on-site. Initial results from these wells <br /> indicate that the lateral extent of the groundwater plume remains undefined. In <br /> conversation with Secor, ARCO's consultant for this site, PHS/EHD asked if ARCO was <br /> interested in acquiring some of the wells at the former Shell site, as well as at a site <br /> further east, for use in their investigation. <br /> PHS/EHD would like to proceed with review of the former Shell site for No Further Action, <br /> but has been told by the Regional Water Quality Control Board, Central Valley Region <br /> (CVRWQCB), that concurrence with a request for closure is not likely with the current <br /> levels of documented MTBE. Should ARCO assume responsibility for some or all of the <br /> wells, and for the MTBE plume, CVRWQCB may consider a "no further action" <br /> determination for the Shell site. <br /> A Division of San Joaquin County Health Care Services <br />