GASOHOL: This specification covers two types of regular grade gasoline for use in automotive spark-ignition engines. The two types are those commercially designated as unleaded and gasohol. Unleaded gasoline shall not contain lead antiknock compounds or phosphorous containing deposit modifiers. Gasohol shall be a blend, by volume, of 90 percent unleaded gasoline and 10 percent denatured ethyl alcohol. PREMIUM DIESEL FUEL: All diesel products are to be “Premium Ultra Low Sulfur” and be dyed farm use type and must show this on the billing. Premium #2 Ultra low Sulfur Dyed Diesel will be required at the Farley Shop where fuel is stored in underground tanks. Premium #2 Ultra low Sulfur Dyed Diesel will be required at the Dubuque Shop and Outlying Shops where fuel is stored in aboveground tanks. When air temperatures are predicted to register below freezing, the fuel order from the Shop Supervisor will be a specified blend of Premium #2 Ultra low Sulfur Dyed Diesel and Premium #1 Ultra low Sulfur Dyed Diesel.