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1117 Lone Palm Avenue <br /> Suite B <br /> ' 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 /> January 12, 1999 ENVIRONMENTAL HEALTH DIVISION <br /> 62574 JAN 21 1999 304 E Weber Ave Third Floor <br /> P O Box 388, Stockton CA 95201-0388 <br /> Approved ____ <br /> Darned <br /> Mr Jeff Wong Conditions <br /> San Joaquin County Public Health Services f <br /> Environmental Health Division Date by_ <br /> 304 E Weber Street, 3rd Floor <br /> Stockton, CA 95202 <br /> Subject Letter Workplan for Vapor Well Abandonment at Fire Engine Company No , <br /> 110 West Sonora Street, Stockton, California <br /> Dear Mr Wong <br /> ATC Associates Inc has prepared this letter workplan, on behalf of the City of Stockton, <br /> Department of Public Works (City of Stockton) for the abandonment of a vapor extraction well at <br /> the above referenced site (Figure 1) During a vapor extraction/air sparge pilot test conducted in <br /> November 1998, ATC observed that the grout seal surrounding VW-2s was cracked and was <br /> allowing air to flow the length of the well casing on the outside The purpose of the well <br /> abandonment is to re-establish an air tight system at the site so the air sparge pilot test can be <br /> completed This work is being done at the direction of San Joaquin County Public Health <br /> Services Environmental Health Division (PHS/EHD) per your verbal request on November 24, <br /> 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 011943671welltr doc 1 <br />