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Avenue, Suite B <br /> T"' 2095792221 <br /> 1117 Lone PMoasto, CA 95351 <br /> _�, http llwww atcassoclates oom <br /> -,V7_ \ <br /> Fax 209 579 2225 <br /> A S S O C I A T E S 1 N C <br /> February28, 2005 <br /> 54 62596 0001 <br /> 1 <br /> E� {1 <br /> ' Mr Jeff Wong ��„t�r�' Y <br /> San Joaquin County � ���� <br /> ENUlfiOfll��t�j�J HEA�!-H <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor P€RF�lT/S��RVlC�S <br /> t Stockton, California 95202 <br /> Subject Monitoring Report Third Quarter 2004, 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 14, 2004 at the site located at 610 North Hunter Street in Stockton, California (Figure l) <br /> ' Quarterly groundwater monitoring and sampling was performed to monitor 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 /> This report also contains the monthly monitoring and sampling of the soil vapor extraction/air sparge <br /> (SVE/AS) remediation system performed during the Third Quarter 2004 by ATC Associates Inc (ATC) <br /> Monthly monitoring and sampling of the remediation system was performed to evaluate the effectiveness <br /> of the SVE/AS system at remediating petroleum impacted soil and groundwater <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 a depth of approximately 22 feet <br /> below ground surface (bgs) The excavation was limited to the north by the on-site building The <br /> ' confirmation samples collected from the base of the over-excavation still contained elevated <br /> concentrations of volatile organics The over-excavated soil was disposed of at Forward Landfill near <br /> Stockton, California <br /> ' On June 30 and July 1, 1997, Smith Technology personnel supervised advancement of seven soil borings, <br /> SBI through S137, 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 /> well locations are shown on Figure 2 On July 3, 1997, the monitoring wells were developed and sampled <br /> s\Lnviro1625961quart1y\3gr-2004 doc 1 ATC Associates Inc <br /> ' ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />