The contract's estimated value can be determined by summing up the estimated costs of the individual projects listed in the contract document. The estimated costs are: $4,778,000 for the construction of a new Air Traffic Control Tower, $3,814,000 for the reconstruction of Alpha South Taxiway and Alpha North Lighting, $1,699,000 for the construction of an SRE/ARFF building, $60,200 for the replacement of Runway 12 REILs, $6,079,400 for the relocation of Runway 9-27, and $2,938,320 for the extension of Runway 9-27. The total estimated value is approximately $19,359,920. However, this is not the total contract value, as the contract is a five-year retainer contract, and the actual value will depend on the number of projects undertaken during the contract period. A more realistic estimate would be to consider the average annual value of the contract, which would be around $3,871,984 per year, assuming that the contract is fully utilized. The total contract value over the five-year period would be approximately $19,359,920.