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260 Graphics Drive <br /> 1Modesto, Caliorna <br /> 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 /> October 6, 1998 ENVIRONMENTAL HEALTH DIVISION <br /> 62574 304 E. Weber Ave. Third Floor <br /> NOV R O. Sox 388, Stockton CA 95201-0388 <br /> Approved <br /> Denied <br /> #-- <br /> Mr. Jeff Wong Conditions S Aeaib14SII 17G.SCr�, <br /> San Joaquin County Public Health-Services �` '� ``� r `'�``" �'^'Mrd P•tzr���,(sr�� <br /> ( of <br /> Environmental Health Division Date by <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 /> T-4 350-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-I 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:162574162574.0 11943671veswkp.doc 1 <br />