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S ffi 1117 Lone Palm Avenue, Suite B ." /t; 4, Modesto, CA 95351 i L �, http://www.ateassociates.com 209.579.2221 Fax 209.579.2225 • A 8 8 a C I A T E 8 I M C . June 17, 2005 54.62596.0001 1UN 2 d ?OQ5 Mr. Jeff Wong San Joaquin County RON{EIVT HEALTH Environmental Health Division PERMIT/S&IVICCS 304 E. Weber Street, Third Floor Stockton, California 95202 Subject: Monitoring Report Fourth Quarter 2004, Farmer Property, 610 North Hunter Street, Stockton, California Dear Mr. Wong: This report presents the results of quarterly groundwater monitoring and sampling performed on December 6, 2004 at the site located at 610 North Hunter Street in Stockton, California (Figure 1). Quarterly groundwater monitoring and sampling was performed to monitor the distribution of petroleum hydrocarbons in groundwater, evaluate the groundwater flow direction, and evaluate the hydraulic gradient in the uppermost aquifer. During the reporting period the soil vapor extraction/air sparge (SVE/AS) remediation system was not operational. Monthly monitoring and sampling of the groundwater treatment remediation system was performed during the reporting period for purposes of compliance. The groundwater treatment system was monitored once for water system parameters on November 5, 2004. SITE HISTORY On October 6, 1987, At Williamson, General Contractor, removed two 1,000-gallon leaded gasoline tanks and one 550-gallon waste oil tank from the locations shown on Figure 2. Soil samples collected after the tank removals contained elevated concentrations of petroleum hydrocarbons and volatile organic compounds (VOCs). On January 21, 1988, Falcon Energy, attempted to remove all VOC contaminated soil by over-excavating the former tank locations. The former tank locations were excavated to a depth of approximately 22 feet below ground surface (bgs). The excavation was limited to the north by the on-site building. The confirmation samples collected from the base of the over-excavation still contained elevated concentrations of volatile organics. The over-excavated soil was disposed of at Forward Landfill near Stockton, California. On June 30 and July 1, 1997, Smith Technology personnel supervised advancement of seven soil borings, SBI through SB7, at the site to depths ranging from approximately 40 to 45 feet bgs to investigate the horizontal and vertical extent of petroleum hydrocarbon soil and groundwater contamination. Three of the soil borings were completed as groundwater monitoring wells and two of the soil borings were completed as vapor extraction wells. The soil boring, groundwater monitoring well, and vapor extraction J well locations are shown on Figure 2. On July 3, 1997, the monitoring wells were developed and sampled saenviro1625961quartlyl4gr-2004.doc ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS