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n <br />• <br />Option 3: <br />Disturbed Soil. <br />• 11 Stockpile existing topsoil during grading and replace it prior to planting. <br />l• <br />1• <br />I• <br />I• <br />I• <br />1• <br />Stockpiled topsoil must be amended if needed to meet the organic matter and <br />depth requirements by following the procedures in option (2). <br />Remove forest duff layer and topsoil and stockpile separately, in an approved lo- <br />cation prior to grading. Cover soil and duff piles with woven weed barrier <br />(available from nursery supply stores) that sheds moisture yet allows airflow. <br />Option 4: <br />Import topsoil mix with 8-13% soil organic mat- <br />ter content. <br />Import topsoil mix of sufficient organic content and depth to <br />meet the organic matter and depth requirements. <br />What is the human <br />impact on soils? <br />55-70% <br />surface water runoff <br />(carries pesticides, <br />silt and animal waste) <br />15% <br />surface water <br />detained/ <br />infiltrated <br />15-30% <br />evapo- <br />transpiration 0% <br />rainfall <br />detained <br />ji <br />Subsoil <br />Groundwater <br />Bedrock I <br />Note: MR S is triggered on sites with more than 2, 000 sq. ft. of new, replaced, or new plus replaced impervious <br />surface, or 7, 000 sq. ft. or greater of land disturbing activity. <br />I• <br />