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t� <br /> V 1117 Lone Palm Avenue, Suite B <br /> �I <br /> Modesto, CA 95351 <br /> www atcassociates com <br /> 209-579-2221 <br /> A S S 0 C I A T E S I N C Fax 209-579-2225 <br /> ' nv►ronmental,Geotechn►cal and Matenals Engineers <br /> 54 62 96 0001 moEW`4E� <br /> ' JUN 1 <br /> Mr Jeff Wong ENVIRON��'it�NT �iEALTk4 <br /> San Joaquin County p�R��}TIS�RVIC�S <br /> ' Environmental Health D1VISlOn <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> ' Subject Monitoring Report First Quarter 2006, 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 March <br /> 23, 2006, 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 /> ' During the first quarter 2006 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 January 24 and March 23,2006 The groundwater treatment system, which is used to treat <br /> ' water produced from the SVE wells, was monitored and sampled on January 24 and March 23, 2006 <br /> SITE HISTORY <br /> ' On October 6, 1987, AI 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 /> ' SB1 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 /> 5\env lro1625961quartlyllgr-2006 doe 1 AIC ASSOCIATES INC <br />