The purpose of the voluntary cleanup program is to:
(1) enable the expansion, redevelopment or return to use of industrial and commercial sites whose redevelopment is complicated by real or perceived environmental contamination;
(2) provide an incentive to conduct response actions at a site by providing nonresponsible parties a covenant not to sue, contribution protection, and third party liability protection, or by providing responsible parties with a covenant not to sue for the work done in completing the response actions specifically covered in the contract and completed in accordance with the approved work plans and reports; and
(3) provide reimbursement to the department for oversight costs.