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establish vegetation. The best method to prevent a lack of bonding is <br /> to actually work the topsoil into the layer below for a depth of at least <br /> 6 inches. <br /> • Field exploration of the site shall be made to determine if there is <br /> surface soil of sufficient quantity and quality to justify stripping. <br /> Topsoil shall be friable and loamy(loam, sandy loam, silt loam, sandy <br /> clay loam, and clay loam). Avoid areas of natural ground water <br /> recharge. <br /> • Stripping shall be confined to the immediate construction area. A 4- <br /> inch to 6-inch stripping depth is coimxton,but depth may vary <br /> depending on the particular soil. All surface runoff control structures <br /> shall be in place prior to stripping. <br /> • Do not place topsoil while in a frozen or n1uddy condition, when the <br /> subgrade is excessively wet, or when conditions exist that may <br /> otherwise be detrimental to proper grading or proposed sodding or <br /> seeding. <br /> • In any areas requiring grading remove and stockpile the duff layer and <br /> topsoil on site in a designated, controlled area, not adjacent to public <br /> resources and critical areas. Stockpiled topsoil is to be reapplied to <br /> other portions of the site where feasible. <br /> • Locate the topsoil stockpile so that it meets specifications and does not <br /> interfere with work on the site. It may be possible to locate more than <br /> one pile in proximity to areas where topsoil will be used. <br /> Stockpiling of topsoil shall occur in the following manner: <br /> • Side slopes of the stockpile shall not exceed 2H:1 V. <br /> • Between October 1 and April 30: <br /> • An interceptor dike with gravel outlet and silt fence shall <br /> surround all topsoil. <br /> • Within 2 days complete erosion control seeding,or covering <br /> stockpiles with clear plastic, or other mulching materials. <br /> • Between May 1 and September 30: <br /> • An interceptor dike with gravel outlet and silt fence shall <br /> surround all topsoil if the stockpile will remain in place for a <br /> longer period of time than active construction grading. <br /> • Within 7 days complete erosion control seeding,or covering <br /> stockpiles with clear plastic, or other mulching materials. <br /> • When native topsoil is to be stockpiled and reused the following <br /> should apply to ensure that the mycorrhizal bacterial, earthworms, and <br /> other beneficial organisms will not be destroyed: <br /> 1. Re-install topsoil within 4 to 6 weeks. <br /> Vohnne II—Conslruclion Sloninvater Polhilion Prevention-Augusl 2012 <br /> 4-31 <br />