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1 <br /> compaction. Backblading or smoothing of slopes greater than 4H:1 V is not , <br /> allowed if they are to be seeded. <br /> . Restoration-based landscape practices require deeper incorporation than ' <br /> that provided by a simple single-pass rototilling treatment.Wherever prac- <br /> tical, initially rip the subgrade to improve long-term permeability, infiltration, <br /> and water inflow qualities.At a minimum, permanent areas shall use soil <br /> amendments to achieve organic matter and permeability performance <br /> defined in engineered soil/landscape systems. For systems that are deeper <br /> than 8 inches complete the rototilling process in multiple lifts, or prepare the <br /> engineered soil system per specifications and place to achieve the specified <br /> depth. 1 <br /> . Fertilizers: <br /> • Conducting soil tests to determine the exact type and quantity of fertilizer is I <br /> recommended. This will prevent the over-application of fertilizer. <br /> . Organic matter is the most appropriate form of fertilizer because it provides , <br /> nutrients (including nitrogen, phosphorus, and potassium) in the least water- <br /> soluble form. ' <br /> . In general, use 10-4-6 N-P-K (nitrogen-phosphorus-potassium)fertilizer at a <br /> rate of 90 pounds per acre.Always use slow-release fertilizers because they <br /> are more efficient and have fewer environmental impacts. Do not add fer- <br /> tilizer to the hydromulch machine, or agitate, more than 20 minutes before <br /> use. Too much agitation destroys the slow-release coating. , <br /> . There are numerous products available that take the place of chemical fer- <br /> tilizers. These include several with seaweed extracts that are beneficial.to <br /> soil microbes and organisms. If 100 percent cottonseed meal is used as the <br /> mulch in hydroseed, chemical fertilizer may not be necessary. Cottonseed <br /> meal provides a good source of long-term, slow-release, available nitrogen. I <br /> • Bonded Fiber Matrix and Mechanically Bonded Fiber Matrix: <br /> • On steep slopes use Bonded Fiber Matrix (BFM)or Mechanically Bonded 1 <br /> Fiber Matrix (MBFM) products. Apply BFM/MBFM products at a minimum rate <br /> of 3,000 pounds per acre of mulch with approximately 10 percent tackifier. 1 <br /> Achieve a minimum of 95 percent soil coverage during application. Numer- <br /> ous products are available commercially. Installed products per man- <br /> ufacturer's instructions. Most products require 24-36 hours to cure before <br /> rainfall and cannot be installed on wet or saturated soils. Generally, products <br /> come in 40-50 pound bags and include all necessary ingredients except for <br /> seed and fertilizer. <br /> 1 <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume 11- Chapter 4 -Page 283 1 <br />