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V <br /> � BMP C105: Stabilized Construction Entrance <br /> Pin/ra.�r Consuuciion cnhanccs are stabiliud to redu�c thc anu�unt nfscdimctn <br /> � u'ansportcd onto p�ccd roads b�- vchicics or cquipmcnt b�� con,u ucting u <br /> stabilizcd p�d of quany spalls at cnuanccs to consuvction sitcs. <br /> � Cnndifinns n/L!se Construction cnU'ances sliall be s�abilized wherever traffic �vill be lca�ing <br /> a consutiction sitc and u•�+�•cling on pavcd roads or uthcr pavcd areas <br /> ���ithin I,000 fect of thc sitc. <br /> ' On large commcrcial, high�+�a��, and road projects, ihe designcr should <br /> include enough ealra materials in the contract to allow tor additional <br /> stabilized cntranccs not shown in thc initial Construction S�VPPP. It is <br /> � dil'ficult to dctcnninc cxacUy wherc access to tiiesc projects will takc <br /> place; additional materials�vill enaUle the contractor to install them �vhere <br /> nccdcd. <br /> � De.cign nnd • See Pigurc 4.2 for details. Nole: the 100' minimum Icngth of thc <br /> In.cfullnfinn entrance shall bc reduced to the maximum practicablc size whcn the <br /> Specificntinn.s size or configuration of the site does not allo«� the full lcnglh (100'). <br /> � • :1 scparation geotcrtile shall be placed undcr the spalls to prevent <br /> fine sediment Gom pumping up into the rock pad. The geoteatilc <br /> shall mcet thc follawing standards: <br /> � Grab Tensile Strength(ASTM D4751) 200 psi min. <br /> Grab Tensile Elongalion(ASTM D4632) 30% max. <br /> � Mullen [3urst Strength (ASTM D3786-80a) 400 psi min. <br /> AOS (ASTM D4751) 20-45(U.S. standard sieve size) <br /> � . Consider carly installation of the first lift of asphalt in areas that will <br /> paved; Ihis can be used as a stobilircd enu•ance. Also considcr the <br /> inslallation of cxccss concrcte as a staUilizcd entrance. During largc <br /> � concrete pow•s, excess concrete is oftcn available lor this pur��osc. <br /> • llog fucl (wood-bascd mulch) may bc substituted for or combincd �vith <br /> ' quairy spalls iu areas that will not bc used for pennanent roads. Hog <br /> I'ucl is gcnerally less effective at staUilizing constniction entranccs and <br /> should be used only at sitcs whcre the amauu of traffic is vcry limited. <br /> � Hog fuel is not recommended for enh•ance stabiliration i;; urban arcas. <br /> "I'hc cffcctivcncss oFhog fucl is highly variablc and it gcncrally <br /> rcquires murc maintenance than quany spalls. The inspector may at <br /> � any timc rcquire thc usc of qumry spalls if thc hog fuel is not <br /> prevcuung scdiment li�om bcing trackcd onto pa�-cment or if thc hog <br /> luel is being canicd onto pavement. Hog fuel is prohibited in <br /> pe�mancnt roadbeds because organics in the subgrade soils causc <br /> t dcs�rada�inn of thc suhvr�de surpniy ovcr�imc <br /> f • I'encing (see 13MPs C103 and C104) shall be installed as nccessary to <br /> resuict u•affic to the consuvetion entrance. <br /> � <br /> � q_g Volume fl- Construction Sformwater Pollution Prevention February 2005 <br /> �5 <br /> � <br />