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BMP C105: Stabilized Construction Entrance / Exit <br /> Purpose Stabilized Construction entrances are established to reduce the amount of <br /> sediment transported onto paved roads by vehicles or equipment. This is <br /> done by constructing a stabilized pad of quarry spalls at entrances and <br /> exits for construction sites. <br /> Conditions of Use Construction entrances shall be stabilized wherever traffic will be entering <br /> or leaving a construction site if paved roads or other paved areas are <br /> within 1,000 feet of the site. <br /> For residential construction provide stabilized construction entrances for <br /> each residence,rather than only at the main subdivision entrance. <br /> Stabilized surfaces shall be of sufficient length/width to provide vehicle <br /> access/parking, based on lot size/configuration. <br /> On large commercial, highway, and road projects, the designer should <br /> include enough extra materials in the contract to allow for additional <br /> stabilized entrances not shown in the initial Construction SWPPP. It is <br /> difficult to determine exactly where access to these projects will take <br /> place; additional materials will enable the contractor to install them where <br /> needed. <br /> Design and See Figure 4.1.1 for details. Note: the 100' minimum length of the <br /> Installation entrance shall be reduced to the maximum practicable size when the size <br /> Specifications or configuration of the site does not allow the fill length (100'). <br /> Construct stabilized construction entrances with a 12-inch thick pad of 4- <br /> inch to 8-inch quarry spalls, a 4-inch course of asphalt treated base <br /> (ATB),or use existing pavement. Do not use crushed concrete,cement, <br /> or calcium chloride for construction entrance stabilization because these <br /> products raise pH levels in stormwater and concrete discharge to surface <br /> waters of the State is prohibited. <br /> A separation geotextile shall be placed under the spalls to prevent fine <br /> sediment from pumping up into the rock pad. The geotextile shall meet <br /> the following standards: <br /> Grab Tensile Strength (ASTM D4751) 200 psi min. <br /> Grab Tensile Elongation(ASTM 30% max. <br /> D4632) <br /> Mullen Burst Strength(ASTM 400 psi min. <br /> D3786-80a) <br /> AOS (ASTM D4751) 20-45 (U.S. standard sieve <br /> size) <br /> • Consider early installation of the first lift of asphalt in areas that will <br /> paved; this can be used as a stabilized entrance. Also consider the <br /> installation of excess concrete as a stabilized entrance. During large <br /> concrete pours, excess concrete is often available for this purpose. <br /> Volume H--Construction Slorsn-valerPollution Prevenfion -August 2012 <br /> 4-7 <br />