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PUBLIC H)5ALTH SERVICES <br /> �P��fN:..� <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor * Stockton, CA 95202 <br /> 209/468-3420 <br /> PETER LENZ C (DPDY <br /> 6465 PACIFIC AVE #134 <br /> STOCKTON CA 95207 JUN 2 5 2001 <br /> RE: Howard Lenz Property SITE CODE: 2182 <br /> 1648 Shaw Road <br /> Stockton CA 95215 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the Monitoring 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 /> 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 PHS/EHD a work plan to define the vertical extent of the <br /> groundwater contamination at this site. Three soil vapor extraction wells have previously <br /> been installed. Include in the work plan a proposal to perform pilot tests in preparation <br /> for the development of a feasibility study. The work pian is due August 6, 2001. <br /> If you have any questions or comments please call Lori 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 />