Chapter 5: Local Road Quantity Calculation and Cost Estimation 141 • National Holidays; and • Non-Working days due to unfavorable weather condition including allowance for the drying period of the soil. c. Field Efficiency. Where 100% production rates are used as a base, the normal field efficiency will be considered between 100% and 70% due to obstructions, regular machine maintenance, suitability of machine to type of work and various types of delays caused by vehicular traffic. Further adjustments will be made as may be deemed necessary; the usual efficiency rating used is 80% d. Taxes and Duties. All taxes and duties will be applicable and chargeable to the Contractor. e. Right-of-Way. The Acquisition of right-of-way be fully completed and staked prior to the commencement of the contract. Any obstruction within the right-of-way at the start of the contract will be removed by the Contractor as specified in the contract; f. Work Areas. The Contractor at his expense will be responsible in providing all accommodations and areas to be used as temporary work sites, camps, shops, stockpile areas, etc. The sites will be cleaned and restored to the extent possible to its original condition after the completion of the project; g. Hauling Distance. The average hauling distances of various construction materials especially aggregates utilizing land or water transportation, are calculated based on the illustration of material sources with data obtained from the nearest engineering district office where the proposed road project is located and actually verified at quarry sites. The determination of the unit prices of materials to be used in the different structures is dependent on the foregoing assumptions;