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r <br /> 1117 Lone Palm Avenue, Suite Modesto, CA 953511 <br /> www atcassociates com <br /> 209-579-2221 <br /> A S S o CI ATES INC Fax 209-579-2225 <br /> 'Environmental,Geotechnical and Matenals Engineers <br /> ' January 18, 2006 u u <br /> 54 62596 0001 <br /> JAM � 3 <br /> Mr Jeff Wong PERPl�ISfS�RJ���S <br /> ' San Joaquin County <br /> Environmental Health Division <br /> 304E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report Third Quarter 2005,Farmer Property, 610 North Hunter Street, <br /> ' Stockton, California <br /> Dear Mr Wong <br /> ' This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> September 27, 2005 at the site located at 610 North Hunter Street in Stockton, California (Figure 1) <br /> Quarterly groundwater monitoring and sampling was performed to evaluate the distribution of petroleum <br /> hydrocarbons in groundwater and to evaluate the groundwater flow direction and the hydraulic gradient <br /> in the uppermost aquifer <br /> ' During the third quarter 2005 reporting period the soil vapor extraction/air sparge (SVE/AS) remediation <br /> system was operational Monthly monitoring and sampling of the SVE remediation system were <br /> performed on July 26, August 31, and October 7, 2005 The groundwater treatment system, which is <br /> ' used to treat water produced from the SVE wells, was monitored and sampled on July 26, August 31, <br /> September 27, and October 7, 2005 <br /> ' SITE HISTORY <br /> On October 6, 1987, Al Williamson, General Contractor, removed two 1,000-gallon leaded gasoline <br /> ' tanks and one 550-gallon waste oil tank from the locations shown on Figure 2 Soil samples collected <br /> after the tank removals contained elevated concentrations of petroleum hydrocarbons and volatile organic <br /> compounds(VOCs) <br /> ' On January 21, 1988, Falcon Energy, attempted to remove all VOC contaminated soil by over-excavating <br /> the former tank locations The former tank locations were excavated to approximately 22 feet below <br /> ' ground surface (bgs) The excavation was limited to the north by the on-site building The confirmation <br /> samples collected from the base of the over-excavation still contained elevated concentrations of volatile <br /> organics The over-excavated soil was disposed of at Forward Landfill near Stockton, California <br /> ' On June 30 and July 1, 1997, Smith Technology personnel supervised advancement of seven soil borings, <br /> SBI through SB7, at the site to depths ranging from approximately 40 to 45 feet bgs to investigate the <br /> horizontal and vertical extent of petroleum hydrocarbon soil and groundwater contamination Three of <br /> the soil borings were completed as groundwater monitoring wells and two of the soil borings were <br /> s lenvlro1625961quartlyl3gr-2005 doc 1 ATC ASSOCIATES INC <br />