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1260 Graphics Drive <br /> Modesto California <br /> t 95351 <br /> 209 579 2221 <br /> ' , Fax 209 579 2225 <br /> ,/AT C <br /> A S S U C I A T E S I N C - <br /> 1 r? <br /> October 6, 1998 <br /> 62574 <br /> Mr Jeff Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Street, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject Workplan for Vapor Extraction and Air Sparge Pilot Test at Fire Engine Company <br /> No 2, 110 West Sonora Street, Stockton, California <br /> Dear Mr Wong <br /> ATC Associates Inc has prepared this workplan, on behalf of the City of Stockton, Department <br /> of Public Works (City of Stockton) for the performance of a vapor extraction and air sparge pilot <br /> test at the above referenced site The purpose of the pilot test is to evaluate if vapor extraction <br /> and air sparging are viable remedial options for remediating petroleum impacted soil and <br /> groundwater in the vicinity of the former underground storage tanks (USTs) This work is being <br /> done at the direction of San Joaquin County Public Health Services Environmental Health <br /> Division (PHS/EHD) as stated in correspondence dated May 6, 1998 <br /> BACKGROUND <br /> According to information supplied by the City of Stockton, the following USTs were removed from <br /> the site on the given dates, and the excavations backfilled <br /> T-1 550-gallon Diesel Removed 10/28/93 <br /> T-2 1,000-gallon Regular Unleaded Removed 10/28/93 <br /> T-3 1,000-gallon Unleaded Removed 04/01/87 <br /> T4 350-gallon Waste Oil Removed 04/23/92 <br /> T-5 550-gallon Diesel Removed 10/28/93 <br /> T-6 1,000-gallon Gasoline/Water Removed 08/07/87 <br /> The locations of the former tanks T-1 through T-5 are shown on Figure 2 In 1988, the City of <br /> Stockton contracted RESNA Industries Inc to conduct a subsurface investigation to assess the <br /> extent of residual hydrocarbons in soil <br /> w 162574162574 011943671veswkp doc 1 <br />