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v1 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> r1 http//www atcassociates com <br /> i <br />�f 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T F 8 I N C <br /> L <br /> November 8, 2005 p <br /> 54 62596 0001 <br /> NOV 1 4 2005 <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 /> t Subject Monitoring Report Second 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 May 12, <br /> 2005 at the site located at 610 North Hunter Street in Stockton, California (Figure 1) Quarterly <br /> 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 /> F <br /> During the second quarter 2005 reporting period the soil vapor extraction/air sparge (SVE/AS) <br /> remediation system was operational A new thermal oxidizer was installed on April 7, 2005 and operated <br /> during the second quarter 2005 Monthly monitoring and sampling of the SVE remediation system were <br /> performed on April 8 and 11, 2005, May 12, 2005 and June 29, 2005 The groundwater treatment <br /> system, which is used to treat produced water from the SVE wells, was monitored on April 8, 2005, May <br /> l 2,2005, May 31, 2005 and June 29,2005 <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 /> ' SB I 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 /> completed as vapor extraction wells The soil boring, groundwater monitoring well, and vapor extraction <br /> s len,,iro1621961quartlyl2gr-2005 doc 1 ATC ASSOCIATES INC <br /> ' ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />