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,t X <br /> V IL 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> http llwww atcassociates com <br /> 209 579 2221 <br /> A s s a c i n r 1E s i N c Fax 209 579 2225 <br />' August 27, 2004 TE' <br /> 54 62596 0001 <br />' AUG 3 Z 200¢ <br /> ENVIRONIVIEN I IIEALm <br />' Mr Jeff Wong PERMIT/SERVICES <br /> San Joaquin County <br /> Environmental Health Division <br />' 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br />' Subject Monitoring Report Second Quarter 2004, 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 /> June 2004 and monthly monitoring and sampling of the remediation system performed during the <br /> Second 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 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 /> stili 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 SB7, at the site to depths ranging from approximately 40 to 45 feet bgs to <br /> s lenviro1625961quan1yl2gr-2004 doc I <br />' ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />