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f <br /> Mr. Kyle Christie Project 20805-146.006 <br /> August 5 1996 <br /> Page 4 <br /> 1. <br /> hydrocarbons were detected above the historical capillary fringe zone (25 feet bgs) at the <br /> Texaco Service Station and adjacent to the Transmission Store. <br /> Dissolved hydrocarbons have been detected at the Texaco Service Station and at the Shell <br /> Service Station. Free-product has been observed at the Texaco Service Station. Based on <br /> the information supplied by SJCPHS, a subsurface investigation was conducted at the <br /> Chevron Service Station. <br /> UST AND PIPING REMOVAL <br /> I <br /> American Construction and Environmental Services (ACES) obtained UST removal <br /> permits from the SJCPHS and provided station demolition, UST removal, and excavation <br /> services. ACES demolished and removed the station building and dispenser islands prior to <br /> UST excavation. Asphalt above the USTs and piping was removed and disposed as <br /> construction debris. Approximately 180 cubic yards of fill material were removed from the <br /> UST complex and stockpiled for use as backfill. Faint to moderate hydrocarbon odors ander <br /> localized discoloration were observed in the stockpiled fill material. ; <br /> ACES dismantled the fiberglass piping prior to the scheduled UST removal time, without <br /> supervision of either the SJCPHS 'or EMCON personnell According to the equipment <br /> operator, the piping was buried less than 2 feet below the,asphalt, and the piping joints <br /> broke during asphalt removal and dispenser demolition. ACES personnel placed the piping <br /> at the approximate locations of the piping trenches prior to UST removal. <br /> Representatives of the Stockton Fire Department (SFD), SJCPHS, and EMCON observed <br /> UST removal on February 7, 1996."ACES personnel inerted the USTs with approximately <br /> 30 pounds of dry ice per 1,000 gallons-of capacity. The SFD inspector approved UST <br /> removal when oxygen and lower explosive limit readings met UST removal guidelines. <br /> SJCPHS and EMCON personnel. visually inspected the USTs after removal. The steel <br /> USTs were in good condition. No evidence of corrosion or holes was observed along <br /> welded seams or UST surfaces. The fiberglass UST was also in good condition without <br /> fractures or holes. Each UST was marked with an identification number and loaded onto a <br /> flatbed truck for transport and disposal by Erickson, Inc., of Richmond, California. <br /> i <br /> ACES excavated the remaining fill,material from the UST excavation to a total depth of <br /> approximately 12 feet below grade. This material, designated stockpile SP-1, remained on <br /> site for use as backfill material of the former UST complex. This material was used to <br /> backfill the former UST cavity at depths of 5 feet to 12 feet surface below grade. <br /> SAC\N-.\PJ(M805\08051460.6DS-9Sc jb:3 <br />