SITE INFORMATION AND CORRESPONDENCE

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9i r Kennedy/Jenks Consultants a Modifying health and safety protocols or terminating field work when unsafe work conditions exist. • Familiarizing personnel with health and safety protocols. • Observing that field personnel wear appropriate personal protective equipment. • Recording data from direct reading instruments and evaluating potential hazards. + Monitoring decontamination procedures. • Recording the occurrence of any site injury or illness. If unsafe conditions are encountered, if illness or injury occurs, or if the level of protection needs to be changed, the SSO or FSSO will consult in a timely manner with the Project Manager, Gerry Nakano, or the Regional Safety Supervisor, Bert Drews. 3.0 SITE DESCRIPTION AND HISTORY 3.1 4555 North Pershing Avenue, Stockton, California. The former Cardlock Service Station located at 4555 North Pershing Avenue in Stockton sold gasoline and diesel fuel from 1979 until May of 1990. The site is approximately 140 feet long and 65 feet wide, and is bordered on the south by Rase Marie Lane, on the east by a pet hospital, on the north by the Venetian Square Shopping Center, and on the west by some retail businesses. The station opened in 1979 with three 12,000-gallon fuel tanks, one for diesel, one for leaded gasoline and one for unleaded gasoline. In May 1987, the diesel tank and one of the gasoline tanks failed a precision tank test. In November 1989, the diesel tank again failed a precision tank test. The first site investigation was performed in May and June of 1991. The investigation consisted of a review of available agency records, and collection of soil samples from nine soil borings across the site. Analysis of soil samples indicated detectable petroleum hydrocarbons at depths of 21 to 27 feet across the site. In January 1992, the fuel tanks were removed from the site. The soil sampling results indicated relatively high petroleum hydrocarbon concentrations in the sample collected from beneath the southern end of the northernmost tank (the unleaded gasoline tank) at a depth of approximately 16 feet. The total petroleum hydrocarbon (TPH) as gasoline concentration in the sample was 785 parts per million (ppm). Petroleum hydrocarbons were not detected in samples collected from beneath the diesel and leaded gasoline tanks, nor from beneath the north end of the unleaded tank. gAjobs19405491H&Sp1anlp1an 3 940549.00