The document is a bid invitation for fuel supply to Placer County in California, specifically for the areas of Roseville and Lincoln. The document outlines the specifications and pricing for different categories of fuel, including unleaded gasoline, #2 diesel, bio-diesel, and ultra-low sulfur diesel (ULD2). It provides details on the delivery point differentials for these areas, indicating whether the differential is positive (+) or negative (-). Additionally, the bid invitation mentions the possibility of the county purchasing exclusively environmentally friendly fuels such as bio-diesel or ULD2. The document also requires bidders to provide technical data and conform to specific state specifications for the fuels. It further explains the definition and requirements for bio-diesel, including the blend ratio and feedstock neutrality. The bid invitation concludes with the specifications and pricing for ultra-low sulfur diesel (ULD2).