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1.0 INTRODUCTION ' This report documents the results of soil sampling activities associated with the removal and replacement of nine diesel dispensers, associated piping and one oil dispenser from the Ryder LC1071 (Site) located at 3633 Duck Creek Drive in Stockton, California (Figure 1). The San ' Joaquin County Department of Environmental Health is the lead regulatory agency for underground storage tank (UST) issues for the Site. The product piping and fuel dispensers were upgraded in accordance with Senate Bill 989. 2.0 SITE SETTING 2.1 Site Description The Site was observed to be a commercial truck leasing and repair facility in September of 2003.The ' Site is rectangular in shape and occupies approximately 4.6 acres of flat land primarily covered with asphalt. One building which contains truck maintenance service bays,office space and storage space is located in the center of the Site. A truck wash and a fuel dispensing area are located south of the maintenance building. A total of nine fuel dispensers, located on three islands, are manifolded to three USTs. Two USTs contain diesel and are of 12,000 gallon and 6,000 gallon capacity. The third UST is of 5,000 gallon capacity and contains lube oil. A Site Sketch is shown on Figure 2. 2.2 Regional Geology The Site is situated near the center of the Great Valley geomorphic province of California. The Great Valley is approximately 400 miles long and 50 miles wide and is bound by the Sierra Nevada Mountains on the east and the Coast Ranges on the west. The Great Valley, often referred to as the ' Central Valley,is divided into the Sacramento Valley in the north and the larger San Joaquin Valley to the south. The naming is synonymous to the major river that drains each section, The Site is located in the San Joaquin Valley(USGS 1991). Geologically,the Great Valley is filled to great depths by marine and continental sediments,which are the result of millions of years of inundation by the ocean and erosion of the rocks that form the surrounding mountains. The Recent age Great Valley deposits are represented primarily by the alluvial, flood and delta plains created by the Sacramento and San Joaquin Rivers and their tributaries. The region persisted as a lowland or shallow marine embayment during the entire Cenozoic and until at least the late Mesozoic (Norris & Webb, 1990). ' FREY