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1260 Graphics Drive <br /> r- Modesto California <br /> 91 <br /> 209 579 2222221 <br /> 7L t (� ;{_��J Fax 209 579 2225 <br /> r ASSOCIATE S INC <br /> C M, r <br /> 12 <br /> January 20, 1998 <br /> 62596 <br /> p'F Sd±r�5s1A1T�L �D�+��L <br /> Ms Mary Meays ®Qax t~7� 4WWW-_V-A <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report Fourth Quarter 1997, Farmer Property, 610 North Hunter <br /> Street, Stockton, California <br /> Dear Ms Meays <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> December 1997 by ATC Associates (formerly Smith Technology Corporation) at the site located <br /> at 610 North Hunter Street, Stockton, California (Figure 1) Sampling was performed to monitor <br /> the distribution of petroleum hydrocarbons in groundwater at the site Monitoring was performed <br /> to determine the groundwater flow direction and the hydraulic gradient in the uppermost aquifer <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 still <br /> contained elevated concentrations of volatile organics The overexcavated soil was disposed of at <br /> 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 at <br /> the site to investigate the horizontal and vertical extent of petroleum hydrocarbon soil and <br /> groundwater contamination Three of the soil borings were completed as groundwater <br /> w 077311guar1lyl4gr-1997 doc I <br />