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' 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www atc-enviro com <br />' 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T E S I N G <br /> i <br />' December 16, 2003 <br /> 54 62596 0001 <br /> 1 <br /> Mr Jeff Wong <br />' San Joaquin County <br /> Environmental Health Division <br />' 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report Third Quarter 2003, Farmer Property, 610 North Hunter <br />' Street, Stockton, California <br />' Dear Mr Wong <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> September 2003 and monthly monitoring and sampling of the remediation system performed <br /> during the Third Quarter 2003 by ATC Associates Inc (ATC) at the site located at 610 North <br /> Hunter Street in Stockton, California (Figure 1) Quarterly groundwater monitoring and <br /> sampling was performed to monitor the distribution of petroleum hydrocarbons in groundwater <br /> and to evaluate the groundwater flow direction and the hydraulic gradient in the uppermost <br /> aquifer Monthly monitoring and sampling of the remediation system was performed to evaluate <br />' the effectiveness of the vapor extraction system and air sparge system at remediating petroleum <br /> impacted soil and groundwater <br />' SITE HISTORY <br /> On October 6, 1987, Al Williamson, General Contractor, removed two 1,000-gallon leaded <br />' gasoline tanks and one 550-gallon waste oil tank from the locations shown on Figure 2 Soil <br /> samples collected after the tank removals contained elevated concentrations of petroleum <br /> hydrocarbons and volatile organic compounds (VOCs) <br /> 1 On January 21, 1988, Falcon Energy, attempted to remove all VOC contaminated soil by <br /> overexcavating the former tank locations The former tank locations were excavated to a depth <br />' of approximately 22 feet below ground surface (bgs) The excavation was limited to the north by <br /> the on-site building The confirmation samples collected from the base of the overexcavation <br /> still contained elevated concentrations of volatile organics The overexcavated soil was disposed <br /> of at Forward Landfill <br /> On June 30 and July 1, 1997, Smith Technology personnel supervised advancement of seven soil <br /> borings, SBI through S137, at the site to depths ranging from approximately 40 to 45 feet bgs to <br /> w Iwordpro1625961quart1yl3gr-2003 doc I <br />' ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />