Fuel adjustment (surcharge) based on a weekly fuel price index. The index shall be the department of Energy’s National Average Diesel Fuel Price Index, after 4:00PM on Monday of each week. Said index may be ascertained direct from the DOE by calling (202) 586-6966 each Monday afternoon. If Monday falls on a holiday, the index for the next business day that is not a holiday will be used to determine the applicable fuel surcharges. The fuel surcharge for each (Monday through Sunday) will be based on Monday’s DOE index of the previous week.