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CITY OF EVERETT S70RMWATER MANAGEMENT MANUAL <br /> � 4. Topsoil shall not be placed whilc in a frozen or muddy condition,when the subgrade is <br /> excessively wet,or when conditioc=exist that may otherwise be detrimental to proper grading or <br /> proposed sodding or seeti�ab. <br /> 5. Previously establishcd�ades on the arcas to be topsoiled s6all be mainWined accotding[o the <br /> approved plan. <br /> 6. When native topsoil is to be stockpiled and reused thc following should apply to ensure that the <br /> mycotrhiral bacterial,carthwortns,and other beneScial organisms will not be destroyed: <br /> a. Topsoil is to bc reinstailed withio 4 to 6 weeks <br /> b. Topsoil is not to become sa[urated with water <br /> c. Plastic cover is not allowed. <br /> Malntertance Standards <br /> Inspect stockpiles regularly,especieUy after large srortn evenu. Stabilize any areas that have croded. <br /> 3.2.13 BMP C126: Polyacn�lamide for Soil Erosion Protection <br /> Purpoae <br /> Polyacrylamide(PAM)is used on construction sites to prcvent soil erosion. <br /> Applying PAM to bare soil in advance of a rain event significantly reduces crosion and controls sedimenl <br /> in two ways. First,PAM increases the soil's available pore volume,thus incrcasing infiltration through I <br /> flocculation aod reducing the quaatity of stortnwater runoff. Second,it increases flocculation of � <br /> ) suspended partides and aids in their deposition,thus reducing srormwater runoffturbidity and improving <br /> ) water quality. <br /> Conditions of Use <br /> 1. PAM shall not be dircctly applied to water or allowed to cntcr a watcr body. <br /> 2. Some PAMs are more toxic and carcinogenic than others. Only the most environmentally safe <br /> PAM products should bc used. <br /> 3. The specific PAM copolymer fottnulation must be anionic. Cationic PAI�t shall not be used in <br /> any application because of Imov,n aquatic toxicity problems. Only the highest drinking water <br /> gradc PAM,cctti6ed for compliancc with ANSWSF Standard 60 for drinking water treatment, <br /> shall be uscd for soil applications. PAM usc shall bc revicwed and appmved by the Ciry. T'he <br /> Washington State Depaztment of Transportation(WSDOT)has listed approvcd PAM products on <br /> their Web site. <br /> 4. In areas that drain to a sediment pond, PAM can hc applicd to bare soil wder the following <br /> conditions: <br /> a. During rough grading operations <br /> b. Staging areas <br /> c. Balanced cut and fill carthwork <br /> d. Haul roads prior to placement of crushed rock su�facing <br /> e. Compacted soil roadbasc <br /> f. Stockpiles <br /> g. After fioal grade and before paving or final seeding and plancing <br /> Volume II—Construcfion Stormwater Pollution Preventron <br /> 3-22 <br />