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2.0 SITE DESCRIPTION 21 Subject Site and Vicinity The subject site is an active service station located at the southeast corner of the intersection of J Street and Harlan Road in Lathrop, California (Figure 1) The current station configuration consists of a station building, four dispenser islands intended for automobile refueling, seven dispenser islands intended for large truck refueling, four 10,000-gallon above ground tanks used to store diesel, one 12,000-gallon UST, one 10,000-gallon UST, and one 4,000-gallon UST used to store gasoline, and one 4,000-gallon UST used to store diesel The configuration of the facility is shown in Figures 2 and 3 Zoning and Land Use Figure 2 illustrates property usage in the immediate vicinity of the subject site Properties to the north and south of the Joe's Truck Plaza site property are developed for commercial use Properties to the east are developed for residential use (detached single-family houses) • Immediately to the west of the site is Interstate 5, and to the west of the highway, the land is currently undeveloped Businesses that operate in the immediate vicinity of the site include a car wash and a self-storage facility Well Search A survey of water supply wells in the vicinity was performed by Avalon Environmental Consultants (Avalon) in January 2000 This well survey consisted only of a review of DWR files Avalon did not identify any water supply wells within a 2,000-foot radius of the site 2.2 Topography and Surface Conditions The subject site is situated on a flat-lying plain, at an elevation of approximately 14 feet above mean sea level that slopes gently toward the west (Figure 1) The site itself is covered either by asphalt or cement paving and planters, as shown on Figure 2 The San Joaquin River flows approximately 5,000 feet to the west (upgradnent) of the site There are also channelized streams and stock watering holes with 1,000 feet of the site to the west There are few surface bodies of water immediately downgradient (cast) of the site and they appear to be at least 10 feet higher in elevation than the study site Although the groundwater is shallow beneath the site (6 to 10 feet bgs), environmental impact to surface waters by groundwater discharge into streams downgradient of the site does not appear likely P Voe's Truck Plaza\Reports\SCM_09-2003Voes truck plaza SCM doc Page 3 STRATUS