The final Record of Decision was completed September 2008, and included all of the recommendations from the newest remediation investigation and feasibility study. This contained specific information about the spread of the plume that was recently believed to not be a matter of concern. The dimensions of the plume spread approximately 367 acres horizontally. It is between twenty-five and ninety-five feet deep. The general boundaries are North to Millbrook Road, East to New York Avenue, Southeast to Brick Memorial High School, South to the intersection of Sally Ike and Lanes Mills Roads, and West to the Garden State Parkway (Dickerson, 2008).
Remedial alternatives were offered to be protective of human health and the environment. These actions must comply with other statutory laws, utilize permanent solutions, and reduce the toxicity of the hazardous substances. One alternative was to provide a landfill cap with institutional controls which included ambient air monitoring, surface water run-off control, a passive venting system and a final system of an impermeable cap. A second alternative would incorporate a multilayered landfill cap, which would consist of an upper vegetative layer, a drainage layer, and a low permeability layer with a synthetic liner of compacted clay. This would treat hotspots near the source area with greater focus and prevent further migration. Another alternative included biochemical treatment of groundwater hot spots by in-situ injection of biochemical agents to promote biological and chemical breakdown of organic compounds. After analysis of all of the alternatives, it was concluded that all options would provide protection to human health and the environment, but would cause disruption to the source area during installation. The final remedy includes installation of solid waste impermeable landfill cap, implementation of long term groundwater sampling and institutional controls (EPA, 2008).