At the time of plans are submitted to the District, the applicant shall make a nonrefundable plan review fee deposit based on 2.0 percent of the estimated construction cost of the recycled irrigation facilities. A minimum deposit of $200 will be required on all projects. Prior to approval of the irrigation plans by the District, the applicant shall pay the final plan review and inspection fee, which will be based on 4.0 percent of the estimated construction cost of the system. The estimated cost will be prepared by the applicant and submitted for review by the District. The minimum fee shall be $400. The applicant will be given credit for the plan review fee deposit. The percentage and/or minimum fee may be revised by the District without prior notice to the applicant. Fees shall be paid prior to the approval of plans.