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Horizontal Spacing of lnterceptor Dikes: <br />A�'eragc Slopc Slopc Pcrcent <br />20fi:1 V or less 3-5% <br />(lOto20)H:IV 5-10°.0 <br />(4 to 10)H:I V 10-25% <br />(2 to 4)li:l V 25-$0°io <br />SlabiliT�tion dcpends on vclocity and reach <br />Flowpath Length <br />300 fcct <br />200 fect <br />100 Ccet <br />50 fcct <br />S�opcs <5°o Sccd �nd ntulch applicd �rithin 5 days of dikc <br />construction (see BA�P Cl1 /, dfulc•hing). <br />Slopcs 5- 40% Dependent on runof( �'elocities and dikc mnterials. <br />Stabilization should he done immediately uslnQ cithcr <br />sod or riprap or othcr measures to a��oid crosion. <br />• The upslopc sidc of thc dikc shall pro��ide positi��e drainagc to the dikc <br />o�tlet. No erosion shall occur at U�c oudet. Pro�•ide encrgy dissipation <br />mcasures as necessary. Sediment-ladcn runoff must be relcased <br />through a scdiment !rapping facility. <br />• Minimize conswctian tra[lic a��er temporan� dikes. Use temporary <br />cross cuh•ens for channcl crossin�. <br />Interceptor swnlcs shall mcct the follo�einc criteria: <br />k3ottom \1'idth 2 fect minimum; thc bottom shall bc Icvcl. <br />Dcpth I-foot minimum. <br />Sidc Slopc ?:I or tla�ter. <br />Gradc Masimum $ perccnt, �sith positivc drainagc �o a <br />suitablc oudct (such as a scdimcnt pond). <br />Stabilization Sced as per BAfP Cl?0, Trmpnrary nnd Perrnmrent <br />Seeeiin�. ur H�t9Y C20.. Chnrin� l 1 i�iii{4�. I Z in�hes <br />thick of ripr.�p pressed into the b;mk and extenJing <br />at Icast 8 inchcs ��ertic.il Gmn thc hottom. <br />. Inspcet di�crsiun dikcs and inicrccptor s���alcs uncc a�ccck and aftcr <br />e��cry ninfall. Inunediatcly rcmove sediment from thc flo�c arca. <br />• Damagc causcA by constn�ction traflic or othcr activity must he <br />rcpaired bcforc thc cnd of cach «�urking day. <br />Check outleis and make timely repairs as needed to avoid gully fbrmalion. �4'hen <br />ihe arca belo��� thc icmpor.�ry divcrsion dike is pemiancndy stabilized, nmovc thc <br />dikc ;md fill :md stahilizc �hc channcl to blcnd ���i�h �hc n;itural surLicc. <br />4-58 Volume ll — Consfrucfion Stormwater Pollution Preven(ron February 2005 <br />