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J ��/ � <br /> PUBLIC HEALTH SERVIICS <br /> SAN JOAQUIN COUNTY <br /> Q: <br /> ENVIRONMENTAL HEALTH DIVISION <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 SEP 21 ' <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) has <br /> reviewed laboratory analytical data from the above referenced facility monitor wells and on-site <br /> Public Water System Well sampled August 11, 1999. <br /> The results of the August 11, 1999 sampling and analyses of water from the on-site Public Water <br /> System Wellhead (#WA460903) again confirms the presence of 1,2-Dichloropropane at 1.7 <br /> ug/L. The current California Primary Maximum Contaminant Level (MCL) for 1,2- <br /> Dichloropropane is 5.0 ug/L. <br /> Diesel has also been detected in the on-site Public Water System Wellhead (#WA460903) at 60 <br /> ug/l. The United States Environmental Protection Agency (USEPA 1980) has established a taste <br /> and odor threshold of 100 ug/I for diesel.No lifetime exposure advisory has been developed. <br /> PHS/EHD now directs the responsible parties at this site to resample the on-site Public <br /> Water System Wellhead (#WA460903) for diesel, gasoline, benzene, toluene, ethylbenzene, <br /> xylenes and fuel oxygenates contamination for confirmation purposes. The resample event <br /> must be completed by October 1, 1999. The sample must be collected at a location in the <br /> water conveyance system prior to entering the pressure tank. PHS/EHD must witness the <br /> sampling event, please call to schedule this field activity. <br /> It is important to note the observed vulnerability of the on-site Public Water System Wellhead. <br /> PHS/EHD requests that the responsible party continue to monitor and report water quality <br /> findings on a routine basis at this wellhead in order to protect consumers. <br /> Corrective Action Regulations require the responsible party to achieve clearly stated objectives <br /> including removal of free product when encountered and timely site characterization. On three <br /> consecutive occasions beginning August :11, 1999 through September 17, 1999 free phase <br /> petroleum hydrocarbons were observed and documented at the above referenced facility in <br /> monitor well MW-5 and sheen in MW-6. MW-5 is located near the northern property line <br /> parallel to Yosemite Avenue. In accordance with California Code of Regulations (CCR) Title <br /> 23, Division 3, Chapter 16, Section 2722 (b) (1) and 2655 free product shall be removed in a <br /> manner that minimizes the spread of contamination by using recovery and disposal techniques <br /> appropriate to the hydrogeologic conditions at the site. It is likely the fuel hydrocarbon plume <br /> and free phase condition extends off-site, as such, the plume is undefined. Consistent with <br /> 1 <br /> A Division of San Joaquin County Health Care Services <br />