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" r 1 !17 Lone Palm Avenue, Suite B <br /> � x <br /> r b Modesto, CA 95351 <br /> v www atc-enviro com <br /> x 209 579 2221 <br /> A S S O C I A T E S I N C <br /> Fax 209 579 2225 <br /> April 24, 2003 C E 11ll D <br /> 54 62596 0001 n l-_ 1J <br /> APR 2 8 2003 <br /> ENVIRON!'OEtil HEALTH <br /> Mr Jeff Wong PERIVI TISERVICES <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report Fourth Quarter 2002, Farmer Property, 610 North Hunter <br /> Street, Stockton, California <br /> a <br /> Dear Mr Wong <br /> I his report presents the results of quarterly groundwater monitoring and sampling performed in <br /> December 2002 and monthly monitoring and sampling of the remediation system performed <br /> during the Fourth Quarter 2002 by ATC Associates Inc at the site located at 610 North Hunter <br /> Street, 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 at remediating 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 /> 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 at <br /> w lwordpro1625961quardyl4gr-2002 duc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />