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BMP C140: Dust Control <br />Purpose Dust control prevents wind trnnsport of dust from disturbed sail surfaces <br />onto roadways, dninagc wnys, and surCacc watcrs. <br />Condi�inns ojUse • In arcas (including road�t�ays) subjcct ro surface and air movement of <br />(I1151 \5'here on-sitc and o(1=sitc impacts to road�cays, drainage ways, or <br />;urface �e��crs are likely. <br />Dcsign and <br />/nsta!lafinrr <br />Specificalinns <br />. Vegctatc or nndch arcas that �eill not rccci��c �chic;c traflic. In areas <br />whcrc plan�ing, mulching, or paving is intpr�ctical, apply gnvel or <br />landscaping rock. <br />. Limit dusl generation by cicaring only those areas where inuncdiatc <br />activity will take place, Iea��i�ig thr remaining arca(s) in the orieinal <br />condition, if stablc. Maintain thc original grouna covcr as long as <br />practical. <br />• Constnict notural or artificial windbrcaks or w•in6screens. These may <br />bc designed as enclosures for small dusi sources. <br />• Sprinkle Ihe site �eith waier until surface is w�et. Repeat as needed. To <br />prcrcnt carryout of ntud onto strcct, rcfcr to Stabilizcd Conswction <br />[ntnnce (BMP C105). <br />• Irrigation �eatcr can 6c uscd for dust control. Irrigation sy�!cros should <br />bc installcd as a first stcp on sitcs ���hcrc Just control is a cunccm. <br />• Spray erposed soil areas with a dust palliati��c, follo�cing the <br />manu(acturcr's inslructions and caulions rcgarding handling and <br />application. Uscd oil is prohibitcd fm•n usc as a dust suppressant. <br />I.oc�l gm�emments ma}' appro�e oth _r dus� palliatiees such as calcium <br />chloridc or PAM. <br />. PAM (E3MP C126) ;iddcd to �r:ucr:u a ralc of 0.? Ibs. per I.000 <br />gallons of watcr per acrc and applicd from a watcr wck is morc <br />effecti��c than ���ater alone. This is due to the increased infiltralion of <br />�tiatcr into thc soil ;mJ rcduccd cvaporation. In addition. small soil <br />particics are bondcd logcthcr and arc not as cnsily tr;mspohcd by �vind. <br />Adding PM1 mny ;1C�U8IIy fCIIUCI' lI1C 1jU80111}' OP K':ucr nccdcd for <br />dust conirol. cspccially in castcm �Vashingt�m. Sincc thc whulrsalc <br />cost of PAM is about f� 4.00 per pound, this is an cstrcmcly cast- <br />eflectivc dust coNrol mcihoJ. <br />Tcchniqucs �hat can bc uscd for unpavcd roads and lots includc: <br />. Lowcr spccd lintits. Iligh vchicic spced incrcascs thc amoiml of dusl <br />stirrcd up from unpaved roads and lots. <br />. Upgradc Ihc road surfacc strength by improving particic sizc, shapc, <br />and mincral typcs th;u makc up the surfacc and basc matcrials. <br />4-40 Volume 11— ConsWclion Sformwater Pollufron Prevenfion February 2005 <br />