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L too, LINTRODUCTION SCOPE LThe objectives of this investigation were to: 1) determine if the gasoline hydrocarbons found in a 1986 field investigation at the Tracy service center originated from the underground gasoline storage tank, and L2) quantify the horizontal and vertical extent of elevated gasoline hydrocarbon levels in the subsurface soil and groundwater that may have originated from the former underground gasoline storage tank. The methodology followed during this investigation was outlined in the Proposed Workplan for the Tracy Service Center - Preliminary Underground Tank Investigation, which was submitted to the San Joaquin County Health Department and the Central Valley Regional Water Quality Control Board on LSeptember 29, 1987. SITE DESCRIPTION L mole The Tracy Service Center is located in the city of Tracy, between llth and 20th Streets adjacent to the Southern Pacific Railroad right-of-way (see L Figure 1) . The site is wholly owned by PG&E, and is used as a service center and substation. Office space and vehicle service bays comprise the only building located onsite. The site is entirely paved with asphalt and concrete except for the substation, which is graveled (see Figure 2) . The site is surrounded by agricultural land and a hardware factory to the Least; a railroad, pet food plant and form manufacturing company to the west; manufacturing facilities to the south; and residential property to the north. The entire area is zoned limited industrial except to the northwest, which is zoned residential. LBACKGROUND This investigation centered around the former fuel tank facility, located at LPG&E's Tracy service center, which consisted of a 1500 gallon steel single-walled underground gasoline storage tank, a fuel pump island and L L3286a/BAV100 1