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i H E. IH_N ENVIRONMENTH TEL= `-15-3_-89- 04 '3 ep 1 21 : 55 i}o . I_105 F . CI'� i Exxon Service Station 3128 W. Bert Holt Dr., Stockton, California j 9/30191 EXECUTIVE SUMMARY � The project site, which is the former Exxon service Station at 3128 West Benjamin Holt Drive, is lwated in northwest Stocktoo, California. at the Southeast corner of Grigsby Place and West Benjamin holt Drive, (approximately 200 feet west of Interstate 5. The site is surrounded by a mixture of corrunercial and residential properties. The site is bonded 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 arca to the south and Interstate l lighway 5 to the east. The site was ars active Exxon Retail Service Station from 1968 (o: 1991. Three single-walled steel underground storage oinks previously comairling gasoline and having a capacity of 6,00[1 gallons, 8,000 gallons and 10,000 gallons are located in the northeast c.or,rer of the site. A 1,000 gallon waste oil tank is located in the southern porrtiol) elf'tl)e site, South of the station house/garage, All underground Storage tank~ on the property are original. Asa para( of th,: process of returning the lease to the owner, the service station building was dernolishtxl Scpteilrber 30, 1991. The underground storage tanks, pumps and product pipelines are scheduled to be removed on or about October 9, 1991. Eleven soil borings were drilled in 1991. Of these, six alert converted into monitoring wells. These wells were installed and sampled according to the regulatory guidelines and protocol. The. wells are part of the active sampling system to monitor the duality of theiroundwater beneath the site. Laborutory ;analyses of soil and groundw1itc;r saml7les collected from this site indicate gasoline or its constitutnts have been detected boar in soil and g,roundwator prililarily in the irnmediate vicinity of the pump island and the underground storage tanks. Tile corrective action to clean-up the site will include the over-excavation and removal of Soils containing gasoline using a backhoe, or similiar earth-moving egluipment. Approximately 800 cubic yards of soil may have to be ren oved froin the sits, '!`hese soils"swill b+: lying on and covered by visqueen to prevent rein-off or aeration %vhile waiting for the analytical results. After all the s environmental dacudocumentationasst! proper analyses have: beeir pet-toritied, the excavated soils will then o be removed from the site and tr-an{ported to the proper landfiil using proper procedures and licensed transporters. The excavation created during tank removal activities and the soil clean:-up action will be.filled with clean engineered fill material. The monitor walls will remain onsite ail will continue to be actively monitored according to regulatory guidelines. Issues related to Woundwater clean-up will be evaluated Lifter the soil clean-up has occurred. i Anesian FnVircinmental Conwllantti• 100 51101 4itw Hwy., Su lte. 295 B • Mill Valley, CA 90111 �