The Contract shall provide a blend of Ultra Low Sulfur Diesel (ULSD) on an as needed basis. The ULSD fuel must meet American Society for Testing and Materials Standard Specification for Diesel Fuel Oils (ASTM D975) grade standards No. 2-D or 2-D S15 in “ASTM D975” Ultra-Low Sulfide Diesel will have 0.0015 percent (15 ppm(mg/kg) maximum sulfur). A minimum of 40 Cetane number is required for each delivery. The viscosity of the fuel should be between the range of 1.4 centistokes (cST) and 4.5 cST. The Contractor shall also provide Diesel Winter Blend, which must include a chemical additive that is in accordance with federally mandated requirements. The winter blend is generally required from October to March; however, the County Project Officer will determine, when the Winter Blend is required, and will inform the Contractor when placing the order. Safety Data Sheet (SDS) shall be provided by the Contractor.