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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> • Escalon,California 95320 <br /> Telephone (209)838-9888 MRY 2 2004 <br /> Facsimile (209)838-9883 <br /> ENVIROmAENT HEALTH <br /> May 20, 2004 PERMIT/SERVICES <br /> Mr Jeff Wong <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Monitoring Well Installation Report <br /> 8200 N Highway 99 Frontage Road, Stockton, CA <br /> Dear Mr Wong <br /> This letter report summarizes the results of the additional subsurface investigation conducted at the <br /> subject site The investigation involved the installation and sampling of five monitoring wells and <br /> was conducted in accordance with Ground Zero's Workplan for Additional Subsurface Investigation <br /> and Feasibility Evaluation and Revised Workplan for Additional Suhsurface Investigation and <br /> Feasibility Evaluation dated September 20, 2002 and June 27, 2003 <br /> INTRODUCTION <br /> Purpose <br /> The purpose of installing the additional groundwater monitoring wells was to further investigate the <br /> lateral extent of contamination in the shallow aquifer north of former tank pit, and determine if the <br /> former water supply well acted as a conduit to deeper zone groundwater contamination east of the <br /> former tank pit One vapor extraction test well was installed to conduct a soil vapor extraction pilot <br /> test Groundwater monitoring wells were completed in three depth intervals informally denoted as <br /> the A Zone (shallow), B Zone (intermediate) and C Zone (deep) <br /> Resources <br /> Between October 6 and October 16, 2003 Mr Sean Garvey, a Ground Zero geologist, and project <br /> manager John Lane, a California Registered Geologist, directed V&W Drilling (V&W, C57-720904) <br /> during drilling and well construction activities Mr Jeff Wong, Mr Michael Infurna, Mr Harlin <br /> Knoll and Ms Margaret Lagorio of the San Joaquin County Environmental Health Department <br /> (EHD) conducted the grout inspections <br /> G IGROUNDZF\TULEBURGIReportslHSA_Mud wells Report 2 doc <br />