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Appendix A - Historical Background/Site Conceptual Model Former MEL BOKIDES PETROLEUM - MOSSDALE 1 444 Mossdale Road, Lathrop, California The site is located on Mossdale Road in an incorporated commercial/agricultural area of Lathrop, California A new fuel station is presently active at the site There is one structure consisting of an office and station building, the remaining areas of the site consists of ether paved or concrete surfaces One domestic ground water well is located on the property and an additional domestic well is located on the adjacent property to the east of the site The surrounding sites are used for boat storage/sales and agriculture A California Department of Transportation road right-of-way is located west and north of the site REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located within the northern San Joaquin Valley which comprises part of the Great Valley geomorphic province of California The San Joaquin Valley is formed by the Great Valley geosynclme, which is a large, elongate, northwest-trending asymmetrical structural trough(basin) It is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Serra Nevada to the east This trough has been filled with sediments derived from both marine and continental sources Thickness of the sedimentary fill ranges from thin veneers along the valley edges to greater than 20,000 feet in the south central porton of the valley The sedimentary formations range in age with the older deposits being primarily marine in origin and the younger deposits being primarily continental Continental-derived sediments were primarily deposited in lacustrine, fluvial, and alluvial environments with sources being the mountain ranges surrounding the valley The site is located on unconsolidated and semi-consolidated alluvium, lake, playa and terrace deposits of Quaternary age The Modesto, Riverbank and Turlock Lake Format)ons and overlying Recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Bann (Basin 5-22) The San Joaquin River is the nearest surface water feature to the property, located approximately -- 1,500 feet east of the site The San Joaquin River is primarily used for commercial and recreational boating,with agricultural as a secondary and equal use The channel contains water continually and has a potential tidal effect upon ground water depth or flow direction in the area UNDERGROUND STORAGE TANK REMOVAL On 05 February 1998, one 10,000-gallon gasoline UST, one 8,000-gallon diesel USTs and one 8,000-gallon gasoline UST were removed from the site, the approximate locations of the former • USTs,product piping and dispensers are shown of Figure 2 Soil samples were collected at the UST Advanced GcoEnv i ronmental,Inc