Enhanced Preliminary Assessment. Task Order 2. Hamilton Army Airfield, Novato, California

Abstract : An enhancement preliminary assessment was conducted at Hamilton Army Airfield (HAA), which is planned for inclusion in the Base Closure Program. Based on information obtained during and subsequent to a site visit from 26 September through 29 September 1989, 12 Environmentally Significant Operations (ESOs) were identified: asbestos on and within buildings, underground storage tanks (USTs), aboveground storage tanks (ASTs), transformers, aircraft maintenance/storage areas, Burn Pit, former radiological disposal site, former sewage treatment facility, JP-4 line, Revetment Area, landfill, and bombing range. Recommended actions for the site investigation of the 12 ESOs include: proceeding with asbestos survey recommendations; inventory and test all transformers; collect soil and ground water (GW) samples from the POL Area; locate and leak testing remaining USTs; collect soil samples from beneath remaining asts; collect soil, sediment, and GW samples from maintenance/storage areas/storm sewer; field investigation and leak test of JP-4 line; soil and GW samples in Revetment Areas; GW samples from landfill; ordnance sweep of bombing range areas; and soil samples from sewage treatment sludge drying beds. No additional action is needed for the former radiological disposal site, as the cylinders were removed and reports indicate no contamination exists.