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rILL <br /> ay <br /> PUBLIC HtALTH SERVICES <br /> SAN JOAQUIN COUNTY Z. <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer .. <br /> 9�fF6•R� <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> MAY 0 3 2000 <br /> FRANK MORITA <br /> MORITA BROTHERS <br /> 6622 BELMONT PLACE <br /> STOCKTON, CA 95207 <br /> RE: Morita Brothers Site Code: 1061 <br /> 814 E. Charter Way <br /> Stockton, CA 95206 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has reviewed the Quarterly Monitoring Report (QMR) dated April 17, 2000 prepared by <br /> Geological Technics Inc., for the above referenced site. Groundwater samples collected <br /> from Monitoring Wells (MWs) on site evidence continued and increasing concentrations <br /> of contaminants. Further investigation of the groundwater at this site is necessary to <br /> determine the vertical and lateral extent of contamination. <br /> Installation of additional MWs will be necessary to evaluate groundwater contamination <br /> and migration. Placement of down gradient MWs east of MW2 to evaluate shallow and <br /> deep units of the aquifer is recommended. PHS/EHD also recommends shallow and deep <br /> screened MWs be placed in the southeastern direction from the source area. Additional <br /> MWs may be necessary to define the contaminant plume at the site. <br /> Conduct a survey of domestic, municipal, agricultural, industrial and any other wells <br /> within a 2,000-foot radius of this site. Contact the Department of Water Resources, <br /> municipal water suppliers and nearby industries for well information. In addition, <br /> perform a physical search of the area to identify any wells. On a map with appropriate <br /> scale show the site, the area within a 2,000-foot radius of the site, and the locations of all <br /> the wells identified within that area. Submit the well address locations as they correlate <br /> to the map and submit any known construction details of the wells (if available). <br /> Evaluate the influence of well pumping with respect to the migration of the <br /> contamination from this site. A survey of any other potential conduits should also be <br /> conducted. <br /> Continue quarterly groundwater monitoring at this site until otherwise instructed by <br /> PHS/EHD. The water from these MWs should be analyzed for Benzene, Toluene, <br /> Ethylbenzene and Xylenes using EPA Method 8020 and Total Petroleum Hydrocarbons <br /> as gasoline using EPA Method 8015. Groundwater samples should also be analyzed for <br /> 1,2 DCA, ethanol,methanol, and Oxygenates using EPA Method 8260. Some <br /> A Division of San Joaquin County Health Care Services <br />