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Electronic Code of Federal Regulations
Title 40: Protection of Environment
§310.16 What kind of cost documentation is necessary?
Cost documentation must be adequate for an audit. At a minimum, you must:
(a) Include a description of the temporary emergency measures for which you request reimbursement;
(b) Specify the local agency that incurred the cost, (such as, the Town Fire Department, the County Health Department, or the City Department of Public Works);
(c) Include invoices, sales receipts, rental or leasing agreements, or other proof of costs you incurred; and
(d) Certify that all costs are accurate and that you incurred them specifically for the response for which you are requesting reimbursement.