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• Roughening and Rototilling: <br /> • The seedbed should be firm and rough. Roughen all soil no matter <br /> what the slope. Track walls slopes before seeding if engineering <br /> purposes require compaction. Backblading or smoothing of slopes <br /> greater than 4H:1 V is not allowed if they are to be seeded. <br /> • Restoration-based landscape practices require deeper incorporation <br /> than that provided by a simple single-pass rototilling treatment. <br /> Wherever practical, initially rip the subgrade to improve long-term <br /> permeability, infiltration, and water inflow qualities. At a <br /> minimum,permanent areas shall use soil amendments to achieve <br /> organic matter and permeability performance defined in <br /> engineered soil/landscape systems. For systems that are deeper <br /> than 8 inches complete the rototilling process in multiple lifts, or <br /> prepare the engineered soil system per specifications and place to <br /> achieve the specified depth. <br /> Fertilizers: <br /> • Conducting soil tests to determine the exact type and quantity of <br /> fertilizer is recommended. This will prevent the over-application <br /> of fertilizer. <br /> • Organic matter is the most appropriate form of fertilizer because it <br /> provides nutrients (including nitrogen,phosphorus, and potassium) <br /> in the least water-soluble form. <br /> • In general,use 10-4-6 N-P-K(nitrogen-phosphorus-potassium) <br /> fertilizer at a rate of 90 pounds per acre. Always use slow-release <br /> fertilizers because they are more efficient and have fewer <br /> environmental impacts. Do not add fertilizer to the hydromulch <br /> machine, or agitate,more than 20 minutes before use. Too much <br /> agitation destroys the slow-release coating. <br /> • There are numerous products available that take the place of <br /> chemical fertilizers. These include several with seaweed extracts <br /> that are beneficial to soil microbes and organisms, If 100 percent <br /> cottonseed meal is used as the mulch in hydroseed, chemical <br /> fertilizer may not be necessary. Cottonseed meal provides a good <br /> source of long-term, slow-release,available nitrogen. <br /> Bonded Fiber Matrix and Mechanically Bonded Fiber Matrix: <br /> • On steep slopes use Bonded Fiber Matrix(BFM) or Mechanically <br /> Bonded Fiber Matrix (MBFM)products. Apply BFM/MBFM <br /> products at a minimum rate of 3,000 pounds per acre of mulch <br /> with approximately 10 percent tackifier. Achieve a minimum of 95 <br /> percent soil coverage during application.Numerous products are <br /> available commercially. Installed products per manufacturer's <br /> instructions. Most products require 24-36 hours to cure before <br /> rainfall and cannot be installed on wet or saturated soils. <br /> Vohnne H—Construction Slor Inwater Pollution Prevention-Augusl 2012 <br /> 4-18 <br />