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' 2 0 SITE BACKGROUND ' 21 SUE LOCATION AND LAND USE The property is located immediately west of the intersection of Sanguinetti Lane and North Wilson Way in Stockton, California U-Haul owns and occupies the property and currently uses the site as a U-Haul vehicle/equipment rental and repair shop The site features are shown on Figure 2 ' The site was formerly used as a retail gasoline dispensing facility According to a 1994 SOTA Environmental Technology, Inc (SOTA) work plan, the site was used as a gasoline retail facility from ' approximately 1950 until 1976 In 1976, the site was listed in the Palk directory as "Stockton Moving Center" From 1976 until 1990, the site was apparently used as an moving equipment rental facility Since ' 1990, U-Haul has used the site in its current capacity 22 HYDRQCARBON RELEASE 1 According to a 1990 ETS Environmental & Assoc (ETS) report, three fuel underground storage tanks (USTs), one waste-oil UST, and associated fuel dispensers were removed from the site in 1990 Since ' 1990, no USTs or associated fuel systems have been in use at the site ETS reported that analytical results of soil samples collected during the removal of the USTs, associated product dispensers and lines indicated • the detection of petroleum hydrocarbons in soil The soil sample locations are shown on Figure 3 and a ' summary of analytical results are presented in Table 1 ' In 1990, ETS completed a "Preliminary Investigation and Evaluation Report" which included results of drilling and sampling three soil borings (B-1,B-2, and B-3) to 100 feet bgs, and the installation of the three ' monitoring wells (MW-1, MW-2, MW-3) within the borings Results of this investigation indicated that petroleum hydrocarbons were present in soil at depths of 60 to 75 feet bgs Subsequent groundwater monitonng performed by ETS in 1992 (Table 2) indicated concentrations of hydrocarbons above the ' California action levels in groundwater samples from the three wells ' Applied Consultants began managing the site for U-Haul in September 1991 Quarterly groundwater monitoring conducted in September 1991 indicated that the depth to groundwater across the site ranged from 85 5 to 86 74 feet bgs and the groundwater flow direction was to the north at a gradient less than 0 001 feet/foot Analytical results of groundwater samples indicated that groundwater at two of the three wells contained benzene at concentrations greater than the California action level ' Applied Consultants completed further assessment of hydrocarbons in soil and groundwater in 1993 This ' 3