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' SSOS Broodwvy 1 dpril S, 20J7 <br /> f,_rcrc�t iVq.rhinClon__ ._ RGlYroiccl No: 1011-123 <br /> v Installing siltation control fencing or anchored straH• or coir waltles on the <br /> downhill sidc otivork arcas; <br /> i Covcring soil stockpilcs wiUi anchorcd plastic shcciing; <br /> Y Rcvcgctating or mulching exposed soils with a mioimum 3 inch lhickness of <br /> straw if surfaces will bc let4 undis1urbcd for more than onc day during wct <br /> weather or onc weck in dry weadicr; <br /> 'v Directing runoCf away from exposcd soils and slopes; <br /> Y Mi��imiting ihc length and steepness of slopcs with cxposcd soils. Graded and <br /> disturbcd slopes should bc trar,ked in pl�ce witli the cquipment running <br /> ,�erpendicular to the slopc contours so that thc track marks provide a Iexture to <br /> hclp resisl erosion and channeling. Some sloughing and ravcling of slopes with <br /> exposcd or disturbcd soil should bc cxpcctcd. <br /> L Decre;xsing runoff velocitics with check dmns, slraw bales or coir watdes; <br /> y Confining scdiment to ihe project site; and <br /> Y Inspccting and maintaining crosion and scdimcnt control mcasums frequcn�ly. <br /> 'I'he c;onuactor shoidd be aware iliat inspection and maintcnancc of crosion <br /> control T3MPs is critical toward thcir satisfactury performance. Repair and/or <br /> replaccment ofdystunclional crosion control elcmcnts should bc aNicipated; <br /> Permazient erosion protection should bc providcd by reestablishing vegetation using <br /> hydrosceding and/or landscape planting. Until thc �xrmanent erosion protection is <br /> cstablished, si�e monitoring should be performed by qualifieA personnel to evaluatc thc <br /> cffcctivcness of thc crosion control mcasums. Provisions for modifications to thc <br /> erosion control system based on monitoring observations shuuld bc included in thc <br /> crosion and scdimcntatimi control plan. <br /> ECOLOGI' I3WCK WALL <br /> I'he proposed wall may bc up to cight fect in height ncar thc centcr a.id will la}xr on both enAs <br /> to match exisling 6nades. The wall shuuld I�c censtrucled in accordance with the att�ched Jctail. <br /> 7�cn foot Icngilis of gcognd should bc placcd in thc fill at hvo foot intcrvals end bc lappcd onto <br /> Uic blocks as shown. Thc gcogrid should consist of a uniaxial gcogrid wilh a lnng tcrm dcsign <br /> strcngth of at Icast 3,200 pounds per foot such as Sladag�id 350 uisnufaclurcd by Stratn Global <br /> GeoSululions. <br /> SlrucWral fill should bc pleced in cight to ten inch lifis nnd compacted to at leaxt 95 peroent of <br /> �hc meximum dry dcnsily. Heary compaGion cquipmcnl should not bc uscd within four feet o( <br /> tlie wall. 71ic gcogrid should be placed on thc compacted soil surface and stretchcd laught and <br /> slaked prior to placement of fill ovcr the grid. 'flie grid should be cul to Iength and placed si�ch <br /> that thc en�ire surfacc is covered. No splicing of grids is allowed and care should bc takcn to <br /> cnsurc thc grid rcmains tlot and taught. <br /> S'fRUCTU1tAL FILL <br /> We t�ecommend placing structural till in IiRs not exceeding 10 inches in Icx�se thickness and <br /> tttoroughly compacted to at Icast 95 peicent of the maximum dry densiq� (MllD)as dctertnined <br /> by lhe ASTM D1557 test procedure. 7 he suilabiliN of excavaled sile soils and import soils for <br /> compactcd struciural fill use will depend on Ihe �adation and ntoislurc contcnt ut the soil when <br /> 'I'NI? RII,EYGROIIP, INC <br />