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b Page 2 2 . BACKGROUND 2.1 SITE SETTING The project site is located in northwest Stockton, California at the southeast corner of Grigsby Place and West Benjamin Holt Drive, approximately 200 feet west of Interstate Highway 5 The site is surrounded by a mixture of commercial and residential properties The site is bounded by a shopping center and a Shell gasoline station to the north, a church and residential area to the west, a water tower, Seven-Eleven parking lot and store and residential area to the south and Interstate Highway 5 to the east The site was an active Exxon Retail Service Station from 1968 to 1991 Three single- walled steel underground storage tanks,previously containing gasoline and having a capacity of 6,000 gallons (used to store extra unleaded gasoline), 8,000 gallons (used to store regular leaded gasoline) and 10,000 gallons (used to store unleaded gasoline), were located in the northwest corner of the site A 1,000 gallon waste oil tank was located in the southern portion of the site, south of the station house/garage According to a report by Engineering Science, Inc (ESI) of Berkeley, California, all underground storage tanks on the property were original 2.2 PREVIOUS INVESTIGATIONS In March, 1991, Engineering Science, Inc of Berkeley, California (ESI) drilled three soil borings at the site and converted them into 4-inch diameter groundwater monitor wells, MW- 1, MW-2 and MW-3 Depth to groundwater was measured at approximately 14 feet below ground surface Groundwater flow direction was to the northeast In June, 1991, Artesian conducted a Phase II subsurface investigation at the site to evaluate the vertical and lateral extent of the hydrocarbons detected in the soils in the previous investigation and the lateral extent of hydrocarbons detected in the groundwater 1 i