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Quik Stop Station No 39 February 14,2003 Stockton California Results Report and Work Pian Addendum - SITE DESCRIPTION AND BACKGROUND l The site is a convenience market and retail gasoline station located on the northwestern corner of the intersection of East Fremont Street and E Street in a commercial and residential area in the city of Stockton, California (Figure 1) Structures and installations at the site include a station building, gasoline dispenser islands under a canopy, and two 12,000-gallon gasoline USTs as shown on figure 2 The site elevation is approximately 22 feet above mean sea level (msl) and is predominantly underlain by alternating beds of sandy silt, silty said and clay with minor cemented sand and sand to approximately 100 feet bsg The regional groundwater flow direction in the site area is generally southwestward The depth to groundwater at the site, as measured in site monitoring wells on November 12, 2002, was approximately 52 feet below surface grade (bsg) In November 1998, toxo single-walled, steel, 10,000-gallon, gasoline underground storage tanks (UST's T-1 and T-2), product piping and dispensers were excavated and removed from the site Removal of the former UST systems and analytical results of soil samples were documented by Horizon in Tank Closure Report dated February 17, 1999 In November 1999, Horizon conducted a soil and groundwater investigation consisting of the drilling and installation of three 2-inch inside diameter (ID) groundwater monitoring wells (MW-1, MW-2, and MW-3) Groundwater was encountered in the borings at depths of approximately 55 feet bsg The monitoring wells were screened across the interval from 40 to 60 feet bsg The investigation was documented by Horizon in Subsurface Site Assessment Report dated February 8, 2000 Horizon has conducted quarterly site groundwater monitoring from December 1999 to May 2002 Quarterly groundwater monitoring data are summarized in Table 1 The DCA distribution indicated by fourth quarter 2002 data is shown on Figure 2 Groundwater flow directions have varied from eastward to southeastward under gradients of 0 002 to 0 03, and C Trolects17039U41WPaddnm2-03 doc Project No 7039 14 2 HORIZON ENVIRONMENTAL INC