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When the total drainage area is greater than or equal to 5 acres, PAM treated areas shall <br />drain to a sediment pond. <br />. Areas less than 5 acres shall drain to sediment control BMPs, such as sediment trap. The total <br />number of sediment traps used shall be maximized to achieve the greatest amount of set- <br />tlement of sediment prior to discharging from the site. Check dams may be used in a drainage <br />channel to form the sediment trap. <br />. Maximize the use of silt fence to limit the discharge of sediment from the site. <br />. All areas not being actively worked shall be covered and protected from rainfall. PAM shall not <br />be the only cover BMP used. <br />. PAM can be applied to wet soil, but dry soil is preferred due to less sediment loss. <br />PAM will work when applied to saturated soil but is not as effective as applications to dry or <br />damp soil. <br />The Preferred Application Method <br />PAM may be applied with water in dissolved form. The preferred application method is the dissolved <br />form. <br />PAM is to be applied at a maximum rate of 2/3 pound PAM per 1,000 gallons water (80 mg/L) per 1 <br />acre of bare soil. See Table 11-3.7: PAM and Water Application Rates to determine the PAM and <br />water application rate for a disturbed soil area. Higher concentrations of PAM do not provide any <br />additional effectiveness. <br />Table 11-3.7: PAM and Water <br />Application Rates <br />Disturbed Area (ac) <br />PAM (lbs) <br />Water (gal) <br />0.50 <br />0.33 <br />500 <br />1.00 <br />0.66 <br />1,000 <br />1.50 <br />1.00 <br />1,500 <br />2.00 <br />1.32 <br />2,000 <br />2.50 <br />1.65 <br />2,500 <br />3.00 <br />2.00 <br />3,000 <br />3.50 <br />2.33 <br />3,500 <br />4.00 <br />2.65 <br />4,000 <br />4.50 <br />3.00 <br />4,500 <br />5.00 <br />3.33 <br />5,000 <br />Follow the steps below to apply PAM using the preferred method: <br />2019 Stormwater Management Manual for Western Washington <br />Volume 11 - Chapter 3 - Page 305 <br />