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5.2 WASTEWATER LINE CLOSURE ACTIVITIES <br /> 1 Following verbal approval for in-place closure of the wastewater line by Ms Diane Hinson <br /> on June 3, 1993, a Workplan for Abandonment of Remaining Wastewater Line was prepared <br /> and submitted to Mr Jerry Wickes of San Joaquin County on June 8, 1993 A copy of the <br /> Workplan is included in Appendix G <br /> 2 The wastewater line was abandoned in place on June 10, 1993 The line was severed in half <br /> and two additional risers were added to shorten the length of run A cement truck was used <br /> to pour a lean cement mix into the risers Cement was poured into the risers until it appeared <br /> at the opposite ends of the line and until a minimum volume of cement was placed sufficient <br /> to completely fill the segments of line Following topping off the risers and allowing the <br /> cement to set up, the risers were cut down to 1 foot below ground surface <br /> 3 Closure of the wastewater line was witnessed by Mr Hann Knoll of San Joaquin County <br /> 6.0 CONCLUSIONS AND RECOMMENDATIONS <br /> . 1 Three USTs were removed from the Site in November 1990 <br /> • A 2,000-gallon UST used for the storage of gasoline <br /> • A 10,000-gallon UST used for the storage of wastewater <br /> • A 26,000-gallon UST used for the storage of diesel fuel <br /> A dispenser and several feet of piping associated with the gasoline tank, and a remote fill line <br /> associated with and located adjacent to the diesel tank were also removed The wastewater <br /> line,connecting the former wastewater tank to the former track pans and inspection pits <br /> located at the former fueling platform, was left in place <br /> 2 Sampling of soils within the tank excavations indicated that sods beneath the former diesel tank <br /> and former wastewater tank had been impacted by petroleum hydrocarbons Overexcavation <br /> of these areas was performed, with concurrent sampling, until laboratory results indicated <br /> low to nondetectable levels of petroleum hydrocarbons in the remaining soils Following the <br /> completion of excavation activities, the areas were backfilled with imported fill <br /> 3 Excavated soils associated with the USTs were sampled and analyzed, and found to be <br /> nonhazardous With regulatory approval, the excavated sods were used as base material for <br /> a new trailer parking area onsite Surfacing activities were performed from December 1990 <br /> • to January 1991 <br /> 12 <br /> ENVIRONMENTAL SOLUTIONS <br />