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CITY OF EVERE7T STORMWATER MANAGEMENT MANUAL <br /> h. Pit sites i <br /> i. Sites having a winter shut do�m. In the casc of winter shut dowu,or where soil u�ll <br /> r�main unworked for sevenl months, PAM should be used togcther with mulch. <br /> Destgn and Installatlon SpeciflcaBons <br /> 1. PAM may be applied in dissolved form with water,or it may be applied in dry,granvlar or <br /> powdercd form. The preferred appGcation method is the dissolved fortn wi:�wa;cr. <br /> 2. PA,�t shall be used in conjunction with other BMPs and not in place of other BMPs. <br /> 3. Do not use PAM on a slope that flows direcUy into a sttcam or wcqand. The stortnwater n�noCf <br /> shail pazs through a scdiment contro!BMP prior to discharging to surfacc waters. <br /> 4. Do not add PAM to water discharging from site. <br /> 5. Whcn the total drainage arw is greatcr than or equal to 5 acres,PAM treatcd areas shall drain to a <br /> sediment pond. <br /> 6. Areas less than 5 acres shall drain ro sediment control [3MPs,such es a minimum of three check <br /> dams per acre. 4 he total number of check dams used shall be maximized to achicve the greatest <br /> amount of settlement af sediment prior to discharging from the site. Lach check dam shall be � <br /> spaced evenly in the drainage channel through which stotmwater flows are dischazged offsite. <br /> 7. On all sites, lhe use of sill fence shall be maximized to limit the discharges of sediment from the <br /> site. <br /> 8. All areas not being actively worked shall be covercd and protected Gom rainfall. PAM slull not <br /> be the only cover BMP used. <br /> 9. PAM can be applied to wet soil,but dry soil is preferred due to less sediment loss. <br /> 10. PAM will work when applied to saturated soil but is not as effective as applications to dry or <br /> damp soil. <br /> I I. Keep lhe granular PAM supply out of the sun. Granular PAM loscs its cffcctiveness iu 3 months <br /> after exposurc to sunlight and a¢. <br /> 12. Proper application and reapplication plans are necessary to ensure lotal eflectiveness of PAM <br /> usage. <br /> 13. PAM,combined with water,is very sfippery and can be a safcty hazard. Carc must bc takcn.to <br /> prevent spols of PAM powder onto paved surfaces. During an app6cation of PAM,pmvcnt ovcr- <br /> sprey from reaching pavcment u pavement will bccome slippery. If PAM powdcr gcts on skin or <br /> clothing, wipe i�off with a rough towel rather ttian washing wiih water-this only makes cicenup <br /> messicr and takc longcr. <br /> 14. PAM designated for these uses should be"watcr solublc"or"lincar"or"non-crosslinked." <br /> Cross-linked or water absorbent PAM, polymerized in highly acidic(pH less than 2)conditions, <br /> arc used to maintain soil moisture conten!. <br /> l5. 1'he PAM anionic charge densiry may vary from 2 to 30 perczut; a valuc of 18 percent is typical. <br /> Studies conducted by the U.S. Department oCAgriculture(USDA)/ARS ,iemonstrated thal soil <br /> slabilization was op4mized by using very hig4 molccular weight(12 to I S mg/mole),higidy <br /> anionic(more than 20 percent hydrolysis)PAM. <br /> 16. PAM tackificrs are available and being uscd in place of guar and alpha plantago. Typically, PAM <br /> tackifiers should bc used at a rate of no more than 0.5 to 1 pound per I,000 gallons of water in a <br /> hydromulch machiue. Some tacki6er product iaswchons say to use at a ratc of 3 to 5 pounds per <br /> Volume ll—Coostruction Stormwater Pollution Prevention <br /> 3-23 <br />