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J <br /> � __._._ . _ .. __ _ .--- - _ _ _ . - <br /> � T,ete a.�o t <br /> Geolextilc Standards <br /> � I� Polymcric Mcsh AOS .. U.l�O mtn ma�unum tnr.lit �ilm uoccns(N40.ic��c) 0.70 <br /> ��(AST�1D4751) mmmaAimumforallothcrEcoicxtilct��pn(HSO .ic�e). <br /> 0.15 mm miniinum I'ur all fabric typcs(n10�sicvc�. <br /> � \1'atcr Pcrmiuivity 092 ticc'� minimum --��-�-----�------. . .- <br /> (AST�1 D4a91) <br /> Grab 7'cnzilc Strcngth 1 ft0 Ibs. Minimum for extra slrcngih fnbric. <br /> � (ASTM D4fi32) �p0 Ibv minimum for stmidard simngih fabric� — <br /> i Grab Tcnsilc Slrcng�h 3U°io maaimwn <br /> (ASTM D4632) <br /> � -- ----- ----------— --- ------_-- <br /> Uhraviolci Rcsistancc 70"r�minimum <br /> (ASTM D4355) <br /> � • 5tandard su•cngth fabrics shall Uc supponed �ti�ith wire mesh. chickcn <br /> �virc, 2-inch x 2-inch wire, safcry fcncc, a�jute mesh to incrcase thc <br /> su�ength of the fabric. Silt fcnce matcrials arc available that havc <br /> � synthctic mcsh backing attachcd. <br /> . filter fabric materi�l shall contain ultraviolet rav inhibito�s and <br /> stabilizers to pro��ide a minimum of six months of expecicd usahlc <br /> � consuvction life at a temperatw•c range of 0°I�. to 12U°P. <br /> . 100 perccnt biodcgradabic silt fencc is availablc tha� is suung, lonf; <br /> � lasting, mid can bc Icti in placc aftcr Ihc projcct is complcicd, if <br /> pci7nitted by local rcgulations. <br /> • Standmd Notes for consuuction plans and spccilicatinns follo�c. Rcfcr <br /> ' to I'igurc 4.19 for standard silt fence details. <br /> � 'l�he contractor shall instutl and maintain temporary silt fences at ihc <br /> locations shown in thc Plans. 71ic silt fcnccs shall Uc consuuctcd in <br /> Ithc arcas of clearing, grading, or drainage prior to sta��ting thosc <br /> activitics. A silt fencc shall not bc considcred temporary if the silt <br /> � fcnce must function bcyond the life of the conu•act. The silt fence <br /> shall prevent soil can•icd by ivnofT�vatcr fi•om going heneath, through. <br /> or over the top of thc silt fence, but shall allow the �vatcr to pass <br /> through thc fencc. <br /> � The minimwn height uf Qie top of silt fence shall Ue 2 fcct and thc <br /> maximum hcight shall bc 2'/� fect abovc thc original ground surfacc. <br /> Il'hc geotcxtilc shall bc scwn togclhcr at thc point of�manulacturc, or at <br /> an approved location �s detennincd by the L•nginecr, lo fomi ocote�tilc <br /> Iengths as rcquired. All sewn seams shall Uc locatcd at a support post. <br />, ( AIlr17��lNCIy, 4\vp mrtjnPS Of silt fence can be ovcrlapred, rr�vidcri <br /> � the Conp•actor can dcmonstrate, �o the satisfaction of thc Enginecr, that <br /> thc overlap is long cnough and that thc adjacent lencc sections arc <br /> � close enough togeiher to prcvent silt ladcn ���atcr from cscaping <br /> through the fcnce at the ovcrlap. <br /> + February 2005 Vofume ll-Construction Sformwater Pollution PieveN�on 4-95 <br /> I 7� <br />