American Home Mortgage Servicing, Inc. (AHMSI), seeks reimbursement of $200,000 in costs, plus interest, incurred in responding to what it characterizes as an order issued under section 106(a) of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), 42 U.S.C §§9601-9675, as amended by the Superfund Amendments and Reauthorization Act of 1986.