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Chapter 4 - Best Management Practices for Erosion and Sediment Control ► <br /> 4 . 03 TEMPORARY GRAVEL CONSTRUCTION ENTRANCE & EXIT <br /> ( ES BMP 1 . 01 ) <br /> Definition <br /> A stone stabilized pad located at points of vehicular ingress and egress on a construction site. <br /> r <br /> Purpose <br /> To stabilize entrances to the construction site and reduce the amount of sediment transported <br /> onto public roads by motor vehicles or runoff. <br /> Conditions Where Practice Applies <br /> Wherever traffic will be leaving a construction site and moving directly onto a public road or <br /> other paved area . <br /> Planning Considerations <br /> Construction entrances provide an area where mud can be removed from construction vehicle <br /> tires before they enter a public road . If the action of the vehicle traveling over the gravel pad <br /> is not sufficient to remove most of the mud , then the tires must be washed before the vehicle <br /> enters a public road . If washing is used , provisions must be made to intercept the wash water <br /> and trap the sediment before it is carried off-site . Construction entrances should be used in <br /> conjunction with the stabilization of construction roads to reduce the amount of mud picked up . <br /> by construction vehicles . <br /> Design Criteria <br /> Aggregate Size <br /> rrr <br /> MOT No . 1 Coarse Aggregate ( 1 . 5 - 3 . 5 inch stone) (4 - 9 cm ) should be used . Wood chips <br /> may be used for single family residential construction , provided that they can be prevented <br /> from floating away in a storm . <br /> Entrance Dimensions <br /> The aggregate layer must be at least 6 inches ( 15 cm) thick. It must extend thefull width of the <br /> vehicular ingress and egress area . The length of the entrance must be at least 50 feet (20 m) . <br /> The entrance must widen at its connection to the roadway in order to accommodate the turning <br /> radius of large trucks . (See Plate 4 . 03a) <br /> 4-7 <br />