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SITE BACKGROUND CANEPA'S CAR WASH, PARK STREET The site is located in the downtown business district of Stockton, California One 12,000- gallon unleaded gasoline underground storage tank (UST), one 5,000-gallon leaded gasoline UST, and one 5,000-gallon diesel fuel UST were removed from the site in 1990 According to WHF Environmental Consultants, Inc (WHF), soil samples collected from the UST excavation from approximately 16 feet below the ground surface (bgs) contained elevated concentrations of gasoline and gasoline constituents Between September 1993 and March 1994, WHF installed six soil bonngs and seven monitor wells in and around the site Three of the monitor wells (MW-1, MW-2, and MW-3) were constructed with a screened interval from 45 to 65 feet bgs Monitor wells MW-4 through MW-7 were constructed with a screened interval from 40 to 60 feet bgs Beginning in April 1997, Condor implemented a quarterly groundwater monitoring program at the site Following the July 1998 quarterly groundwater monitoring event, Mr Rowe of the PHS/EHD requested the installation of additional monitor wells The tops of the screened intervals of monitor wells MW-1 through MW-7 are submerged below the present groundwater table Condor prepared a work plan dated November 17, 1998, for the installation of four additional monitor wells (MW-8 through MW-11) In a letter dated September 7, 2001, however, Mr Jeffrey Wong of the PHS/EHD requested that an additional work plan be submitted by October 20, 2001 to define the lateral and vertical • extent of groundwater contamination and the vertical extent of soil contamination at the site Mr Wong also requested submittal of a Sensitive Receptor Survey Report for a 2,000-foot radius around the site by November 10, 2001 In response to Mr Wong's request, Condor submitted the Work Plan for Additional Soil and Groundwater Investigation, dated October 17, 2001 The work plan describes several proposed direct push borings intended to investigate the lateral and vertical extent of contamination and assist in the siting of additional monitor wells in a subsequent phase of work, if necessary Mr Wong subsequently approved the work plan, with modifications, in a letter dated October 29, 2001