Specifications include, but are not limited to: Firm-fixed bid differential rate per gallon contract with one (1) qualified source for the procurement of Heating Oil for Prince William County Public Schools. 5.1. The #2 Heating Oil shall conform in every respect to the detailed requirements of the American Society of Testing Materials Standard D 396-95 (ASTM). 5.2. Fuel oil shall be free of grit, acid, water and fibrous or other foreign materials or natural substances likely to clog or injure the burners and valves. 5.3. The Contractor shall inspect the tank fill systems with the PWCS TPOC, (or their designee) to confirm current status and operational abilities of the tank fill system prior to making the first product deliveries.