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Site Background Information: Cherokee Truck Stop AGE-NC Project No. 97-0312 Page 2 of 6 Ground water in the area of the Cherokee Truck Stop site is considered to.be of beneficial use. SITE.HISTORY The property was historically a trucking terminal and was first developed as such in the 1930s. At that time, the property reportedly only included the southern portion of the current property. The surrounding land use in the 1930s was primarily.agricultural. It is reported that the area north of the former property line(now part of the larger parcel)was used as a landfill in the 1950s for the surrounding occupants. No information is.available concerning dates of operation,owners,or operators of the landfill.Research of aerial photographs in the 1950s depict a trench or open ditch which traversed the property from Highway 99 to.Newton Road;it is unknown which portions of this ditch were.used for disposal. The trucking terminal was expanded in the 1970s to.include the area to.the north,including the ditch or dump area. The ditch or dump was filled in by Delta Fleet (the property owner at the time) in order to provide.useable space for the facility.According to Mr.Ellis Cecchini,Caltrans was granted right-ofway access and provided concrete fill for this activity(ESE, 1995;.personal communication, 2004). As part of the trucking terminal expansion, an unlined surface impoundment was constructed in 1970 to collect oily wastewater generated from onsite steam-cleaning of truck parts; the reported dimensions of the surface impoundment were 20.feet by 40 feet with depths ranging from 4 to 8 feet, although a 1979.aerial photograph shows the impoundment to be approximately 120 feet long by 90 feet wide. The surface.impoundment was used by Delta White from 1970 to 1985; during this period, Delta stated that no organic solvents were used in the steam-cleaning operation, and the impoundment never contained more than 1 to 2 feet of oily water at any time. In March 1985, the impoundment was backfilled to grade with dirt and rubble from local construction and covered with 8-to. 12 inches of gravel. The discharge from the steam-cleaning operation was diverted to three oil/water separators. The first two separators were 3-foot diameter concrete sumps connected in series near the steam cleaner. The third separator was a 1,900-gallon concrete septic tank in the area of the former impoundment, which was connected to a 100-foot, 6-inch PVC perforated-pipe leach line laid in gravel..Wastes from the separator system reportedly were hauled periodically-for disposal or recycling;water is re-used in the system. The septic tank was removed in 1989 during a subsurface investigation. Advanced GeoEnvironmental,Inc.