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r: -n aE��C �.c� .:R�� ,• .y�?�. _r ��;� ;': cx �.. rs�, 'y�"�;b - °` €w''- ry� nIN "a .:T L.\S3rinar0/13AFr 17150 SITE DESCRIPTION The site is located on the corner of Benjamin Holt A•renue and Plymouth Road in Stockton, California. It is an active service station, presently being remodeled, that retails regular, unleaded, and super- unleaded gasoline. The former location of the underground storage tanks was on the south side of the site near Benjamin Holt Avenue. The former waste oil tank was located on the northeast part of the site. The new location of the underground storage tanks is on the north-central part of the site Figure 2. ._, the vicinity map for the site is presented in Figure 3. To the northeast of the site, across Plymouth Avenue, is the Swenson Park golf course. Behind the site, directly to the north, are several small businesses. Three other service stations are in the vicinity of the site. An active Arco service station is located to the south of the site across Ben Holt Drive. The Arco station has several monitoring wells, one well located in the side walk along Ben Holt Avenue bordering the Chevron site aad three other off site wells along Benjamin Holt Drive and Plymouth Avenue (Figure 3). A Shell service station is located to the west of the site on the other side of Interstate-5 Freeway. The site has 4 monitoring wells. An Exxon station is located to the southwest of the site across the Interstate-5 Freeway. No information concerning any investigation was available for that site., SITE BACKGROUMD The former underground skLarag* tanks and the waste oil tank were removed by Blaine Tech Services (BTS) of San Jose, California, between 6 and 10 January 1985. Results of the soi' sampling conducted by BTS during the tank removal were reported to Chevron on 17 January 1989. Total petroleum hydrocarbons were detected in soils excavated from the tank pit. Oil and grease were detected in soil excavated from the waste oil pit. A soil vapor survey (SVS) was conducted by VIGR on 13 and 14 February 1989. Total volatile hydrocarbons were detected in vapor points sampled at about 15 ft below grade in the vicinity of the former location of the underground storage tanks, along former product line locations, and adjacent to the former location of the pump ;:;lands. OFF SITE BACKGROUND In May 1984, Arco reported a gasoline spill at their station across from the Chevron site. The release was estimated at between 2,000 gallons w �Al 1040=9 a.