As part of the Remedial Action Plan (RAP) assessment, we looked at the effectiveness of potential corrective measures that meet the requirements of the Resource Conservation and Recovery Act (RCRA) and address the site-specific objectives of protecting human health and the environment. Based on this analysis, Maricopa County’s preferred remedy for the site is the on-site extraction remedy with off-site injection, although an on-Site injection well scenario was also retained as a contingency measure. We came to this conclusion after comparing the practicability, risk, cost, and benefit or value of each alternative.
Physical components of the on-site extraction remedy consist principally of a new pump and treat (P&T) system located in the southern portion of the property. This includes a groundwater extraction well, piping, groundwater treatment equipment, and an injection well (located either on-site or off-site) to recharge clean, treated water back into the aquifer. There will also be one new off-site monitoring well to test for any impacted groundwater that may not be contained by the P&T system and a soil vapor extraction system located in the northern portion of the site. The SVE system includes multiple vapor extraction wells and air treatment equipment. This cleanup operation is expected to last 30 years.