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Amendment Options — SECTION FOUR <br />OPTION 3: Stockpile existing topsoil during grading. Replace it before planting. <br />Stockpiled topsoil must also be amended if needed to meet the organic <br />matter or depth requirements, either at a pre -approved default rate or <br />at a custom calculated rate. <br />Scarification. If placed topsoil plus compost or other organic material will amount to less than 12 inches: <br />Scarify or till subgrade to depth needed to achieve 12 inches of loosened soil after topsoil and amendment are placed. <br />Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. <br />Stockpile and cover soil with weed barrier material that sheds moisture yet allows air transmission, in approved location, <br />prior to grading. <br />Replace stockpiled topsoil prior to planting. Amend if needed to meet required organic content. <br />A. Planting Beds <br />B. Turf Areas <br />1. PRE -APPROVED RATE: Place 3 inches of <br />1. PRE -APPROVED RATE: Place 1.75 inches of <br />composted material and rototill into 5 inches of <br />composted material and rototill into 6.25 inches <br />replaced soil (a total amended depth of about 9.5 <br />of replaced soil (a total amended depth of about <br />inches, for a settled depth of 8 inches). <br />9.5 inches, for a settled depth of 8 inches). <br />2. CALCULATED RATE: Place calculated amount <br />2. CALCULATED RATE: Place calculated amount <br />of composted material or approved organic <br />of composted material or approved organic <br />material and rototill into depth of replaced soil <br />material and rototill into depth of replaced soil <br />needed to achieve 8 inches of settled soil at 10% <br />needed to achieve 8 inches of settled soil at 5% <br />organic content. <br />organic content. <br />Rake beds to smooth and remove surface rocks larger than <br />Water or roll to compact soil to 85% of maximum dry <br />2 inches diameter. <br />density. <br />Mulch planting beds with 2 inches of organic mulch or <br />Rake to level, and remove surface rocks larger than 1 inch <br />stockpiled duff. <br />diameter. <br />OPTION 4: Import topsoil mix of sufficient organic content and depth <br />to meet the requirements. <br />Scarification. Scarify or till subgrade in two directions to 6 inches depth. <br />Entire surface should be disturbed by scarification. Do not scarify within drip line of existing trees to be retained. <br />A. Planting Beds <br />B. Turf Areas <br />Use imported topsoil mix containing 10% organic matter <br />Use imported topsoil mix containing 5% organic matter <br />(typically around 40% compost). Soil portion must be sand <br />(typically around 25% compost). Soil portion must be sand <br />or sandy loam as defined by the USDA. <br />or sandy loam as defined by the USDA. <br />Place 3 inches of imported topsoil mix on surface and till <br />Place 3 inches of imported topsoil mix on surface and till <br />into 2 inches of soil. <br />into 2 inches of soil. <br />Place 3 inches of imported topsoil mix on surface and till <br />Place second lift of 3 inches topsoil mix on surface. <br />into 2 inches of soil. <br />Water or roll to compact soil to 85% of maximum. <br />Place second lift of 3 inches topsoil mix on surface. <br />Rake to level, and remove surface rocks larger than 1 inch <br />Rake beds to smooth, and remove surface rocks over 2 <br />diameter. <br />inches diameter. <br />Mulch planting beds with 2 inches of organic mulch. <br />