In cases of contracts with assessment or improvement districts where full payment is made in the form of a single warrant, or other evidence of full payment, after completion and acceptance of the work, the awarding body shall accept from the contractor in cash a sum equal to, and in lieu of, any amount required to be withheld, retained, or forfeited under the provisions of this section, and said awarding body shall then release the final warrant or payment in full.

(Enacted by Stats. 1937, Ch. 90.)