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eighed on accurate scales sealed by the Measure- ent Standards Section of the Colorado Department f Agriculture as often as the Engineer may deem ecessary and at least once each year. Scales shall be urnished by the Contractor or the Contractor may tilize commercial scales operated by certified eighers. When commercial or Contractor furnished scales are used, they shall be operated by weighers certified by the Measurement Standards Section of the Colorado Department of Agriculture. The cost of weighers, scales, and scale house will not be paid for separately but shall be included in the contract price for the weighed material. A representative of the Division may, at the discretion of the Engineer, be present to witness the weighing and to check and compile the daily record of such scale weighte. The operator of each vehicle weighed by a certified weigher shall obtain a weight or load slip from the weigher and deliver the slip to the Engineer at the point of delivery of the material. The cost of the certified weigher and the delivery of the weight or load slip will not be paid for separately but shall be included in the contract price for the weighed material. If the certified weigher does not perform the duties according to the Colorado Department of Agriculture regulations, the weigher will not be allowed to weigh material for state projects. A commercial scale is defined as one that is available to the general public, either at a com- mercial source of materials or a public weighing station. Scales shall be accurate within the allowable tolerances as prescribed by State law. Scales shall be inspected and sealed whenever the Engineer deter- mines there is reason to believe the scales are not accurate within the limits prescribed by State law. In the event scale accuracy is found acceptable, the cost involved in checking the scale shall be at the Division's expense. Should the scale accuracy be found unsatisfactory, the cost involved in checking the scale shall be at the Contractor's expense. Poises shall be designed to be locked in any position to prevent accidental change of position. Vehicles used to haul material being paid for by weight shall be weighed empty daily at times directed by the Engineer and shall bear a plainly legible identification mark. The Contractor shall furnish to the Engineer, in writing, a list of identifi- cation marks, number of axles, and the distance between extreme axles of each delivery vehicle to be used on the project. This information shall be furnished prior to time of delivery of the material and at any subsequent time the Contractor changes vehicles, combination vehicles, or axle length re- lationships. Materials to be measured by volume in the hauling vehicle shall be hauled in approved vehicles and measured therein at the point of delivery. Vehicles for this purpose may be of any size or type, provided 33 the body is shaped so the actual contents may be readily and accurately determined. All vehicles shall be loaded to their water level capacity and all loads shall be leveled when the vehicles arrive at the point of delivery. Water used in the work will be measured by the M Gal. (1000 U.S. gallons). The weight of inherent moisture in the material will not be deducted. Water added for the Contractor's convenience will not be paid for. Water may be measured either by volume or by weight. Water meters shall be accurate within a range of t3 percent. When water is metered, the Contractor shall use an approved metering device and shall furnish the Engineer a certificate showing that the meter has been accurately calibrated within the time allowed in the following schedule: 2 inch meter 4 years 4 inch to 6 inch meters 2 years 8 inch to 10 inch meters 1 year Water meters shall be calibrated when the Engineer determines there is reason to believe the meters are not accurate within the allowable toler- ance. In the event water meter accuracy is found acceptable, the cost involved in checking the water meter shall be at the Division's expense. Should the water meter accuracy be found unsatisfactory, the cost involved in checking the water meter shall be at the Contractor's expense. For those materials specified to be measured by the cubic yard, an acceptable method of computing volumes of excavation is to determine a weight/vol. lume factor and convert weighte to volumes by means of the factor. The weight/volume factor shall be determined by Colorado Test Procedures CP22 or CP80 as described in the Division's Materials Man- ual. The number of tests used to determine the material weight/volume factor shall be determined by the Engineer. The locations where the tests are taken shall be at those locations specified in the "Method of Measurement" for the particular bid item; i.e., Unclassified Excavation. in its original position: Embankment Material - in its final com- pacted position, etc. Bituminous materials will be measured by the gallon or ton. Volumes will be measured at 60. F. or will be corrected to the volume at 60. F. using ASTM D 1250 for asphalts or ASTM D 633 for tars. Net certified scale weights or weights based on certified volumes in the case of rail shipments will be used as a basis of measurement, subject to correction when bituminous material has been lost from the car or the distributor, wasted, or otherwise not incorporated in the work. When bituminous materials are shipped by truck or transport, net certified weights or volume subject to correction for 108s or foaming, will be used for computing quantities. Cement will be measured by the ton. Timber will be measured by the thousand feet