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1.0 GENERAL INFORMATION 1.1 SITE HISTORY The site is located in a agricultural zone on the south eastern corner of Durham Ferry Road and Highway 33 south east of Tracy, California. The topography for the site is flat, except for the area built up for the railroad tracks on the west side of Highway 33. Open agricultural fields surround the site to the south, west and east. On the north side of the site and directly across the street of Durham Ferry are single family homes. Each of the homes has an independent water supply via an independent well. George's Service is now primarily operated as a small convenience store and some light duty automotive repairs are completed in the old shop. The underground storage tanks were operated decades ago when the small service station was in full operation. The property and area impacted is primarily along the north side of the main building and immediately adjacent to Durham Ferry Road. The surface area is a mixture of sand, gravel and deteriorated asphalt. No permanent and reliable surface encapsulation is in place at the site in the area where the petroleum release occurred. (refer to Figure 5.2) The surface water for the area immediately surrounding the proposed remedial site, is not channeled or directed to any one place in particular. Typically when there is rainfall the storm water will pool up in this low-lying area and create a small pond. In this area of the facility the water naturally percolates into the subsurface. There are no engineered surface discharge or water distribution systems in this section of the facility. The following chapters will discuss all of the remedial tasks of excavation, backfilling, stockpiling, off hauling and final confirmation sampling. 1.2 SITE SPECIFIC CONDITIONS The area of impacted concern is where one 1000 gallon gasoline underground storage tank (UST) was previously located. This UST was used for many years for supporting the commercial sales of gasoline to the general public and many local farmers. The actual age of the UST was not known, however it was determined that the tank had been in service for many years. To keep within compliance of new federal and state regulatory requirements the removal of this one gasoline UST, along with another was required. In completing this task it was discovered that the UST and or piping system had failed. Elevated levels of gasoline hydrocarbons and volatile aromatics were detected in the shallow groundwater and soils immediately under the unit. Upon being notified by San Joaquin County Public Health (SJCPHD), a full site investigation was completed. All documentation and copies of analytical results are on file at SJCPHD. Soil DEL-TECH Page 1 8/15/00