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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />PENSKE TRUCK LEASING EVERETT ONSITE IMPROVEMENTS <br />CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN <br />Sitts & Hill Engineers, Inc. <br />Job Number 17,710 <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. <br />• Fertilizers: <br />. Conducting soil tests to determine the exact type and quantity of fertilizer is <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. <br />. Bonded Fiber Matrix and Mechanically Bonded Fiber Matrix: <br />. <br />On steep slopes use Bonded Fiber Matrix (BFM) or Mechanically Bonded <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. <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 Storrnwater Management Manual for Westem Washington <br />Volume ll - Chapter 4 - Page 283 <br />SITTS & HILL ENGINEERS, INC. 33 <br />' TACOMA, WASHINGTON <br />