FIELD DOCUMENTS FILE 2 - Laserfiche WebLink

Home Browse Search

CLEARWATER. G R O U P EnviroemenW Services Following removal of the pipes, the trench was backfilled with clean, imported material in addition to clean overburden excavated for line removal. The maximum depth of the excavation at any point was j approximately three feet, with a width of approximately two feet. The excavation was filled in several lifts, with each lift compacted with a portable compactor. The excavation was filled flush with the surrounding grade. Gravel was..placed on the surface area of the filled to match surrounding surface. The removed PVC lines were cut into small lengths and disposed as non-regulated waste. On April 18, 2001, the electrical service to the former remedial area was disconnected. The electrical panel and pole were removed. Well Destruction Prior to conducting field activities, appropriate well destruction permits were obtained from the SJCPHS/EHD. A total of 14 project wells were scheduled for destruction (Table 1). All wells, except two, were scheduled to be destroyed by pressure grouting methods. Wells MW-1 and MW-2 were scheduled to be destroyed by overdrilling methods. During field inspection, it was determined that MW-1 could not be overdrilled due to an overhead obstruction, therefore, this well was also pressure grouted. On April 12, 2001, Clearwater supervised Fast-Tek Engineering Support Services (a C-57 licensed contractor) in destruction of 14 project wells (Figure 2 and Table 1). Well MW-2 was overdrilled and backfilled to the surface with neat cement. Wells requiring pressure grout were filled with neat cement followed by the application of 25 psi for five minutes. Each well head was then topped off with neat cement. If standing water was present in any borehole or well, the neat cement was placed by tremie tube methods. The protective box and concrete skirt around each wellhead were removed with an electric hammer. The area around each former wellhead was finished flush at the surface with existing gravel. i Drill cuttings were stored on-site in labeled 55-gallon drums, pending characterization for appropriate off-site disposal. Recovered PVC well material was handled as non-regulated waste. Investigation Derived Waste Disposition All investigation derived waste (i.e. purge water and soil) was removed from the site by April 20, 2001 for appropriate off-site disposal. Historical investigation laboratory data were used to profile for final disposition at appropriate facilities. Conclusions All remnants of investigation/remediation related hardware and wells have either been removed or properly abandoned in place at the subject site. Additionally, all investigation derived waste has been removed from the project. No further project activity is required. Ruiz-Well Destr./Sys.Removal 2 April 25,2001