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Y Exxon Service Station 3128 W. Ben Holt Dr., Stockton, California `9!30/91 ' EXECUTIVE SUMMARY The project site, which is the former Exxon service station at 3IZ8 West Benjamin Holt Drive, is located in northwest Stockton, California, at the southeast corner of Grigsby Place and West Benjamin Holt Drive, Approximately 200 feet west of Interstate o. The site is surrounded by a mixture of cortunercial and residential properties. Tho site is li undeti by a shopping center and a Shell gasoline station to the north, u church and residential area to the west, a water tower, Seven- ' Eleven parking lot and store and residential arca to the south an'd Interstate Highway S to the east. f The cite was an active Exxon Retail Service Station from 1968 to 191. Three single-walled steel underground storage tanks previously containing gasoline and having a capacity of 6,000 gallons, 8,000 gallons and 10,000 gallons are Iocated in the northeast corner of the site. A 1,000 gallon waste oil tank is located in the southern ponion of the site,south of the station house/garage. All underground storage tanks on the property are original. As a part of the process of returning the lease to the owner, the service station building was demolished September 30, 1991. The underground storage tanks, primps and product pipelines aro scheduled to be.removed on or about October 9, 1991. i I ; Eleven soil borings were drilled in 1991. Of these, six were converted into monitoring wells. These ; wells were installed and sampled according to the regulatory >?uidelincs and protocol. The wells are part of the active sampling system to monitor the quality of thegt'oundwatcr betle<1th the rite. r Laboratory analyses of soil and groundwatcr samples collected frolrl this site indicate gasoline or its constituents have been detected both in soil and groundwater primarily in the immediate vicinity of the pump island and the underground storage tanks. I The corrective action to clean-up the site will include the over-elzeavation and removal of coils containing gasoline using a backhoe, or similiar earth-movingcquipin.nt. Approximately 800 cubic yards of soil may have to be removed from the site. Meese coils ill be lying on and covered by visquern to prevent nun-off or acrttion while waiting for the analytical results. After aU the environmental documentation :aid proper analyses haws; b4.;n performed, the excavated soils will then 9 be removed from the site and transported to rhe proper landfill using proper procedures and licensed transporters. The excavation created during tank removal activities and the soil clean-up action will be filled with 14' clean engineered fill material. The monitor%vc Us will remain ani site at'id will continue to be actively monitored according to regulatory guidelines. Jssues related to groundwater clean-tip will be evaluated after the soil clean-up has occurred. . An csian t?nvironmenmi Convoiant% 100 Shardinc Hwy., Suite 295 $ • Miir valley. CA 949.11 l