Laserfiche WebLink
Under the supervision of the CTFD and SJC representatives, the <br /> contractor will remove the USTs from the excavation, load, haul and <br /> dispose of each tank at a certified disposal facility <br /> Soil Excavation and Disposal <br /> Following removal and disposal of the tanks, the contractor will <br /> overexcavate each tank pit three feet laterally in all directions to remove <br /> the most heavily contaminated soils The bottom of the 500 gallon UST pit <br /> will also be overexcavated an additional two feet in order to facilitate <br /> groundwater collection <br /> All excavated soils will be screened using a photoionization detector (PID) <br /> during excavation Clean overburden soils will be stockpiled separately <br /> from the impacted soils All stockpiled soil will be placed on and covered <br /> with 10 mil plastic Sand fill from within the USTs will be stockpiled with <br /> the impacted soil All impacted soil will be loaded, hauled and disposed <br /> of at Forward, Inc landfill in Stockton, California, a Class II non- <br /> hazardous waste landfill Debris from removal of surface pavements and <br /> slabs that is determined to be free of impacted materials will be <br /> transported and disposed of at the nearest municipal landfill <br /> Ground Water Removal and Disposal <br /> Following removal and disposal of impacted soils, the contractor will <br /> provide a temporary groundwater holding tank for each UST pit and will <br /> pump approximately 2,000 - 3,000 gallons of groundwater from each <br /> excavation The contractor will provide granular activated carbon as <br /> required for treatment of the stored groundwater All stored ground <br /> water will be treated to non-detectable concentrations of the contaminants <br /> and discharged to the on-site industrial sewer system <br /> Backfilling and Surface Restoration <br /> Following completion of the excavation activities and upon receipt of <br /> approval from SJC, the contractor will backfill the excavations with clean <br /> overburden material from the excavations and additional imported clean <br /> fill material as necessary to restore site to existing grade Backfill will be <br /> placed in lifts not exceeding 12-inches and will be compacted to 90% <br /> maximum density as determined by Modified Proctor Test ASTM D 1557 <br /> ERM will provide an independent testing firm to perform in-place <br /> 49 compaction tests during backfilling operations Re-compaction and re- <br /> 3-3 <br />