Ed. Code, § 16543

(a) The average per pupil cost of constructing complete school facilities in the area of the state project for the purposes of this article shall be determined by the board, after consultation with the department and the Department of General Services, on the basis of information obtained thereby and any other information that may be available to the department.

(b) Estimates of the number of project children and indirect project children for the purpose of this article shall be made by the applicant school district in accordance with rules prescribed by the director and shall be made as of the time the greatest number of such children will attend the schools of the district as a result of the state project. The estimates shall be made on the basis of the best information available to the district at the time of the application. Approval of the estimates by the director, in whole or in part, shall be on the basis of the best information available to the director at the time of the approval. In the approval of estimates of the number of project children and indirect project children for the purposes of this article the director may utilize the facilities and services of any department or agency of the state as he or she deems necessary and proper. No estimate shall be used as a basis of an apportionment that has not been approved by the director.