The cleanup plan called for the dredging of up to 2.65 million cubic yards of contaminated sediments to a depth that will allow for a cap to be built without losing any lake surface area. The plan also called for the installation of a barrier wall made of steel on the southwest corner of the lake to prevent contamination from the wastebeds from getting into the lake. In 2011, Honeywell completed second-phase construction on this barrier wall. The estimated cost of the cleanup plan was $451 million; an estimated $414 million in order to construct the remedy, followed by an annual maintenance cost of $3 million.