New Jersey Statutes Title 27. Highways 27 § 14-15

When a contract provides for partial payments based upon the amount of work done, the state highway engineer or his authorized agent, in conjunction with the county engineer shall, as each payment becomes due, present to the board of chosen freeholders a certificate, signed by said state and county officials, specifying as nearly as may be, the amount of work done for which payment is to be made, and stating that it has been done in strict conformity with the contracts, plans and specifications.

When the work done under a contract shall have been fully completed, the state highway engineer and county engineer shall cause to be prepared a detailed and itemized statement, in quadruplicate, of the cost of the improvement, one copy to be filed with the board of chosen freeholders, one with the county clerk and two with the commissioner.