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PUBLIC H?ALTH S '0;L U J N C, <br /> SAN JOAQUIN COUNTY <br /> • ENVIRONMENTAL HEALTH DIVISION . <br /> Karen Furst, M D , M.P.H., Health Officer ,p <br />' 4LJFOR� <br /> 304 East: Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> f � r <br /> PETER LENS <br /> 6465 PACIFIC AVE #134 �.'#•ECEIV D ` -+� <br />' Zj <br /> STOCKTON CA 95207' JUN 2 5 2001 <br />' <br /> RE Howard Lenz Property JUL U 3 21101 SITE CODE 2182 <br /> 1648 Shaw Road <br /> Stockton CA 95215 <br />' San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) <br /> has reviewed the Monitonng Well Installation and Quarterly Report— First Quarter 2001, <br /> dated March 23, 2001 that was submitted by Advanced GeoEnvironmental, Inc on your <br />' behalf and has the following comments <br /> The report documents fieldwork that took place in February 2001 when four shallow <br />' monitoring wells were installed to continue the investigation of the lateral extent of the <br /> petroleum hydrocarbon contamination at this site Soil samples for analysis were <br /> collected during the drilling of the boreholes The new wells, MW-4 through MW-7, were <br /> lie developed on February 8, 2001 and sampled on February 9, 2001 Monitoring and <br /> sampling of the older wells, MW-1 through MW-3, had taken place on January 25, 2001 <br />' Analytical results from the soil samples indicate that the lateral extent of the soil <br /> contamination has been defined Soil analytical results from prior investigations indicate <br /> that the bulk of the soil contamination exists at levels above 35 feet below surface grade <br /> in the vicinity of the former underground storage tank location and south to MW-2 <br />' Analytical results from the monitoring well samples indicate that the lateral extent of the <br /> contaminant plume has been defined, but the vertical extent in the source area has not <br />' You are directed to submit to PHSIEHD a work plan to define the vertical extent of the <br /> groundwater contamination at this site Three sod vapor extraction wells have previously <br /> been installed Include in the work pian a proposal to perform pilot tests in preparation <br /> for the development of a feasibility study The work plan is due August 6, 2001 <br /> If you have any questions or comments please call Lon Duncan at (209) 468-0337 <br />' Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, Senior REHS Dot Lofstrom, R.G <br />' LOP/Site Mitigation Unit IV Engineering Geologist <br /> cc Marty Hartzell, CVRWQCB <br /> Brian Millman, AGE <br /> A Division of San Joaquin County Health Care Services <br />