Security to guarantee the performance of any act or agreement shall be in the following amounts:

(a) An amount determined by the legislative body, not less than 50 percent nor more than 100 percent of the total estimated cost of the improvement or of the act to be performed, conditioned upon the faithful performance of the act or agreement; and

(b) An additional amount determined by the legislative body, not less than 50 percent nor more than 100 percent of the total estimated cost of the improvement or the performance of the required act, securing payment to the contractor, to the subcontractors, and to persons furnishing labor, materials, or equipment to them for the improvement or the performance of the required act.

(c) Whenever an entity required to furnish security in accordance with subdivisions (a) and (b) is a California nonprofit corporation, funded by the United States of America or one of its agencies, or funded by this state or one of its agencies, the entity shall not be required to comply with subdivisions (a) and (b), if the following conditions are met:

(1) A letter or letters of credit are provided pursuant to paragraph (3) of subdivision (a) of Section 66499 for 100 percent of the contract of improvements or the contractor installing the improvements has bonded to the nonprofit corporation and the local agency as coobligee the amount of 100 percent of the contract for the faithful performance of the work, and has further bonded to the nonprofit corporation and the local agency as coobligee an amount of not less than 50 percent of the contract for the payment of labor and materials, and those bonds comply with the provisions of this chapter.

(2) All moneys under the control of the nonprofit corporation and payable to the contractor by the nonprofit corporation are deposited in a depository complying with the provisions of this chapter, and out of which moneys progress payments are conditioned upon:

(A) The contractor’s certification to the nonprofit corporation that all labor performed in the work, and all materials furnished to and installed in the work, have been paid for in full to the date of the certification.

(B) The written approval of the nonprofit corporation.

(C) Review and approval of progress payment billings by local government.

(D) Final payment to the contractor not being made until 30 days shall have expired after the filing and recording of the notice of completion of the work and acceptance of the work by, and a waiver of lien rights provided by the contractor to, the local agency in writing.

(3) All certifications as to progress payments shall be delivered through the United States mail to the nonprofit corporation. The term “progress payments” means payments made in compliance with the schedule of partial payments agreed upon in the contract for the work. No less than 10 percent of the total contract price shall be retained for the 60 days following the filing of the notice of completion.

(d) Subject to the limitations of Section 66499.9, an amount determined by the legislative body necessary for the guarantee and warranty of the work for a period of one year following the completion and acceptance thereof against any defective work or labor done, or defective materials furnished.

(Amended by Stats. 1988, Ch. 1308, Sec. 4.)