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Stabilized Construction (Entrance/ Exit TC-1 <br /> Implementation <br /> General <br /> A stabilized construction entrance is a pad of aggregate underlain with filter cloth located at anv <br /> point where traffic will be entering or leaving a construction site to or from a public right of way, <br /> street, alley, sidewalk, or parking area. The purpose of a stabilized construction entrance is to <br /> reduce or eliminate the tracking of sediment onto public rights of way or streets. Reducing <br /> tracking of sediments and other pollutants onto paved roads helps prevent deposition of <br /> sediments into local storm drains and production of airborne dust. <br /> Where traffic will be entering or leaving the construction site, a stabilized construction entrance <br /> should be used. NPDES permits require that appropriate measures be implemented to prevent <br /> tracking of sediments onto paved roadways,where a significant source of sediments is derived <br /> from mud and dirt carried out from unpaved roads and construction sites. <br /> Stabilized construction entrances are moderately effective in removing sediment from <br /> equipment leaving a construction site. The entrance should be built on level ground. <br /> Advantages of the Stabilized Construction Entrance/Exit is that it does remove some sediment <br /> from equipment and serves to channel construction traffic in and out of the site at specified <br /> Iocations. Efficiency is greatly increased when a washing rack is included as part of a stabilized <br /> construction entrance/exit. <br /> Design and Layout <br /> • Construct on level ground where possible. <br /> ■ Select 3 to 6 in. diameter stones. <br /> ■ Use minimum depth of stones of 12 in. or as recommended by soils engineer. <br /> ■ Construct length of So ft minimum, and 30 ft minimum width. <br /> ■ Rumble racks constructed of steel panels with ridges and installed in the stabilized <br /> entrance/exit will help remove additional sediment and to keep adjacent streets clean. <br /> ■ Provide ample turning radii as part of the entrance. <br /> ■ Limit the points of entrance/exit to the construction site. <br /> ■ Limit speed of vehicles to control dust. <br /> ■ Properly grade each construction entrance/exit to prevent runoff from leaving the <br /> construction site. <br /> • Route runoff from stabilized entrances/exits through a sediment trapping de�,gce before <br /> discharge. <br /> ■ Design stabilized entrance/exit to support heaviest vehicles and equipment that will use it. <br /> ■ Select construction access stabilization (aggregate, asphaltic concrete, concrete)based on <br /> Iongevity, required performance, and site conditions. Do not use asphalt concrete (_AC) <br /> grindings for stabilized construction access/roadway. <br /> 2 of 6 california Stormwater BMP Handbook <br /> January 2003 <br /> construction <br /> svww.cabmphanbbooks.com <br />