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_ 1117 Lone Palm Avenue <br /> Suite B <br />+ (VATC Modesto, CA 95351 <br /> 209. 579 . 2221 <br /> Fax 209.579.2225 <br /> A S S O C I A T E S I N C . <br /> ENVIRONMENTAL HEALTH DIVISION <br /> March 28 , 2000 304 E. Weber Ave. Third Floor <br /> 54 . 62596 . 0001 P. O. Box 388, Stockton CA 95201 -0388 <br /> Approved .Ey <br /> Denied F1 <br /> Lu / Conditions yEe gni - fbw w <br /> EPA YnrFwkA , See - 8 - cy-oa 3 <br /> Mr. Ron Rowe Date 5- I -7cwu by p� - <br /> San Joaquin County Public Health Services <br /> Environmental Health Division Fa4 \ 3) b�vrtfwc PoaA vowrtE �rrctrtvgc Rr4a <br /> 304 E. Weber Street, 3rd Floor Wit' \ qlo vn0 Liz e F wE�s rv��v ty <br /> Stockton, CA 95202 <br /> R— i A15T{Zu�7teMATlc1�1 <br /> Subject' Workplan for Vapor Extraction and Air Sparge Pilot Test at Farmer Property, 610 <br /> North Hunter Street, Stockton, California is P rA I P- <br /> Dear Mr. Rowe : PcLt) 101" <br /> � LAXi <br /> ATC Associates Inc. has prepared this workplan, on behalf of the Mr. and Mrs. Raymond Farmer L` <br /> for the performance of a vapor extraction and air sparge pilot test at the above referenced site. <br /> The purpose of the pilot test is to evaluate if vapor extraction and air sparging are viable remedial <br /> options for remediating petroleum impacted soil and groundwater in the vicinity of the former <br /> underground storage tanks (USTs). <br /> I <br /> I BACKGROUND <br /> I <br /> c <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 onsite 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 <br /> at Forward Landfill . <br /> E <br /> On June 30 and July 1 , 1997, Smith Technology personnel supervised advancement of seven soil <br /> borings, SBl 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:\62596\reports\veswkp.doc 1 <br /> f <br />