N.J. Stat. § 40A:11-23.1a
In the case of a project for the erection, alteration, or repair of a building, structure, facility or other improvement to real property, the total price of which exceeds the amount set forth in, or the amount calculated by the Governor pursuant to, section 3 of P.L. 1971, c.198 (C.40A:11-3), that does not have historical or suspected soil contamination, or for which the plans, specifications and bid proposal documents for the project do not include a line item allowance or minimum unit price line item for soil testing and contaminated soil disposal pursuant to subsection e. of section 1 of P.L. 1999, c. 39(C.40A:11-23.1), and contaminated soil from the site cannot be disposed of pursuant to the plans, specifications and bid proposal documents due to the contaminated soil being found to be different from the type or quality originally disclosed, the contracting unit shall approve, consistent with and subject to the "Local Public Contracts Law," P.L.1971, c.198 (C.40A:11-1 et seq.), and any rules or regulations adopted pursuant thereto, a change order to reimburse the contractor for the additional reasonable costs, as determined by the contracting unit, required to test and dispose of the contaminated soil.
N.J.S. § 40A:11-23.1a