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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> http llwww atcassociates com <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A 8 8 0 C I A T E S 1 N C <br /> r <br /> i <br /> July 19, 2004 <br /> 54 62596 0001 1-01IE CE y(_[0 <br />' J U L 2 1 2004 <br /> Mr Jeff Wong ENVIRONMENT HEALTH <br /> San Joaquin County PERMIT/SERVICES <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor <br />' Stockton, California 95202 <br /> Subject Monitoring Report First Quarter 2004, Farmer Property, 610 North Hunter <br /> rStreet, Stockton, California <br />' Dear Mr Wong <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> March 2004 and monthly monitoring and sampling of the remediation system performed during <br /> the First Quarter 2004 by ATC Associates Inc (ATC) at the site located at 610 North Hunter <br /> Street in Stockton, California (Figure 1) Quarterly groundwater monitoring and sampling was <br />' performed to monitor the distribution of petroleum hydrocarbons in groundwater and to evaluate <br /> the groundwater flow direction and the hydraulic gradient in the uppermost aquifer Monthly <br /> monitoring and sampling of the remediation system was performed to evaluate the effectiveness <br />' of the vapor extraction system and air sparge system at remediating petroleum impacted soil and <br /> 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 /> 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 /> s 1env1ro1625961quart1yl1 qr-2004 doe 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />