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installed landscapes. Topsoil does not include any subsoils but only the <br /> material from the top several inches including organic debris. <br /> Conditions of . Permanent landscaped areas shall contain healthy topsoil that reduces <br /> Use the need for fertilizers, improves overall topsoil quality,provides for <br /> better vegetal health and vitality, improves hydrologic characteristics, <br /> and reduces the need for irrigation. <br /> • Leave native soils and the duff layer undisturbed to the maximum <br /> extent practicable. Stripping of existing,properly functioning soil <br /> system and vegetation for the purpose of topsoiling during <br /> construction is not acceptable. Preserve existing soil systems in <br /> undisturbed and uncompacted conditions if functioning properly. <br /> • Areas that already have good topsoil, such as undisturbed areas, do not <br /> require soil amendments. <br /> • Restore, to the maximum extent practical,native soils disturbed during <br /> clearing and grading to a condition equal to or better than the original <br /> site condition's moisture-holding capacity. Use on-site native topsoil, <br /> incorporate amendments into on-site soil, or import blended topsoil to <br /> meet this requirement. <br /> • Topsoiling is a required procedure when establishing vegetation on <br /> shallow soils,and soils of critically low pH(high acid) levels. <br /> • Beware of where the topsoil comes from,and what vegetation was on <br /> site before disturbance, invasive plant seeds may be included and could <br /> cause problems for establishing native plants, landscaped areas, or <br /> grasses. <br /> • Topsoil from the site will contain mycorrhizal bacteria that are <br /> necessary for healthy root growth and nutrient transfer. These native <br /> mycorrhiza are acclimated to the site and will provide optimum <br /> conditions for establishing grasses. Use commercially available <br /> mycorrhiza products when using off-site topsoil. <br /> Design and Meet the following requirements for areas requiring disruption and <br /> Installation topsoiling: <br /> Specifications Maximize the depth of the topsoil wherever possible to provide the <br /> maximum possible infiltration capacity and beneficial growth <br /> medium. Topsoil shall have: <br /> • A minimum depth of 8-inches. Scarify subsoils below the topsoil <br /> layer at least 4-inches with some incorporation of the upper <br /> material to avoid stratified layers, where feasible. Ripping or re- <br /> structuring the subgrade may also provide additional benefits <br /> regarding the overall infiltration and interflow dynamics of the soil <br /> system. <br /> Vohnne 11--Construction Stornnvater Pollution Prevention-August 2012 <br /> 4-29 <br />