Base Bid 1 – One year transportation bus lease for diesel and gas (Gas preferred), with mandatory purchase of District Bus #53. The bidder must provide both (1) a purchase/credit value for Bus #53 and (2) a total lease cost with this purchase/credit applied. Base Bid 2 – Two year transportation bus lease for diesel and gas (Gas preferred), with mandatory purchase of District Bus #53 under the same terms described above. Base Bid 3 – Three year transportation bus lease for diesel and gas (Gas preferred), with mandatory purchase of District Bus #53 under the same terms described above. Base Bid 4 – Company proposal / extension of current bus fleet for two additional years, with mandatory purchase of District Bus #53 under the same terms described above. Base Bid 5 – New Buses Only (One Year, Two Year, or Three Year transportation bus lease for diesel and gas buses, Gas preferred), with mandatory purchase of District Bus #53 under the same terms described above.