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OPUBLIC 1-9EALTH SERVIWES oPofuIN <br /> SAN JOAQUIN COUNTY Q M <br /> ENVIRONMENTAL HEALTH DIVISION . <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202. 'FOR <br /> 209/468-3420 <br /> OCT 01 1997 <br /> FRANK GUINTA JAMES RAMSEY <br /> 2072 W YOSEMITE AVE 840 LA CONTENTA DRIVE <br /> MANTECA CA 95336 VALLEY SPRINGS CA 95252 <br /> RE: FRANKS EXXON SITE CODE: 1426 <br /> 2072 W YOSEMITE AVE <br /> MANTECA CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) reviewed and <br /> provided comments to Don Thompson in the absence of Frank Guinta by telephone regarding the Remedy <br /> Expert Environmental, Inc (REE) work plan, site specific public water supply well data from FGL <br /> Environmental Laboratory (FGL), and Request for Bid prepared by Don Thompson on August 11, 1997. <br /> During this conversation Mr. Thompson stated that the he was in the process of securing at least two <br /> additional bids and work plans which were to be submitted to this agency for the site referenced above(as <br /> evidenced by the request for bids document). To date no additional work plans have been submitted to <br /> PHS/EHD, therefore,a review of the existing workplan has been completed. <br /> As a result of reviewing the workplan dated July 28, 1997(received August 1, 1997)submitted by Remedy <br /> Expert Environmental, Inc. on behalf of Frank Guinta, PHS/EHD provides the following comments and <br /> directives. <br /> PHS/EHD does not concur with several REE assessment approaches and the workplan submitted fails to <br /> address critical aspects related to current regulations. <br /> Groundwater contamination with variable concentration and constituents at different elevations(in shallow <br /> ground water grab samples and the deeper public water system well) at this site suggests hydraulic <br /> communication between the two depths and therefore possible contamination at other intervals. The <br /> vertical and lateral extent (three-dimensional) of contaminant distribution in both soil and groundwater <br /> must be addressed in the next scope of work adhering to the directives provided below. <br /> This letter presents a directive for an immediate full three dimensional definition and investigation of soil <br /> and groundwater contamination by fuel hydrocarbon constituents and chlorinated solvents resulting from <br /> an unauthorized release documented at your site. You are hereby required to complete a Soil and Water <br /> Investigation (SWI). This directive is issued in accordance with California Code of Regulations (CCR), <br /> Title 23,Division 3, Chapter 16,Article 11,Corrective Action Regulations, Chapter 6.7&6.75,Article 4, <br /> Section 25299.37, California Health and Safety Code, and the Central Valley Regional Water Quality <br /> Control Board(CVRWQCB)Basin Plan. <br /> The results of recent groundwater sampling indicate the presence of high levels of dissolved MTBE <br /> (21,000 ug/1). Other fuel additives may also be present in the subsurface environment at this site. You are <br /> required to analyze all water and selected soil samples for Tertiary Butanol, MTBE, DIPE, ETBE, and <br /> TAME employing EPA 8260 (see CVRWQCB attachment 91) for all samples until further written notice <br /> 1 <br /> A Division of San Joaquin County Health Care Services <br />