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1 17 Lone Pafm Avenue, Suite B <br /> adesto, CA 95351 <br /> CVV <br /> !,� �{ ataenvlro coin <br /> 2095792221 <br />' MAY 3 2003Fax 209 579 2225 <br /> �11 �OC �AT E S I N C ������ <br /> rIMERVICES <br />' May 26, 2003 <br /> 54 62596 0001 <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 First 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 /> March 2003 and monthly monitoring and sampling of the remediation system performed during <br /> the First Quarter 2003 by ATC Associates Inc at the site located at 610 North Hunter Street, <br /> Stockton, California (Figure 1) Quarterly groundwater monitoring and sampling was performed <br />' to monitor the distribution of petroleum hydrocarbons in groundwater and to evaluate the <br /> 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 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 /> 1 <br /> wlwordpro1625961quan1y\1gr-2003 doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />