1202 SHUKSAN WAY 2018-01-01 MF Import

i � � sequcncing and �� athcr. Tlic pmjccl impac� on crosinn-pronc arcas can hc rcduccd h� implcmcnting a Tcmporan Grosion and Sedimcnta�irni Conlrol Plan (TGSCP). Tlm plan sl�ould hc Idcsigned in aceordance with applicable Ci1�- of Gverctt slandards. Sitc monitoring should hc � perfortned by qualified personncl to c��aluate Ihe ef'fectivcness of the crosion conlrol meawres, and to make recommendations for repairs and/or modificaiions to the crosion coutral .ryslcm, as Iappropriate. Provisirnis for modifications to the crosion conirol spstem h.sed on moniioring obscnations should he includcd in thc l'L'SCP. Tlu plan should incor�ioratc hacic planning + principles, including: � • Scheduling grading and crnistruction to minimizc soil cxposurc. • Rctaining esisting vicee�ation whencvcr fcasiblc. I • Revegetating or mulchin f dcnudcd arcas. • Dirccting runofi'a�+�a� from denuded arcas. I • Mindnizing Ihe length and sleepness at'slopes with e�poscd soils. • Decrcasingrunoffrelocities. • Preparinc drainage��•a��s and.��Uels to handle concenlrated or increased runoff. I • Confining sedimcnt ro die project site. � • Inspecting and maintaining cor,trol measures frequendy. IIn addition,we recommend that slope surfaces�+�ith eaposed or diswrbed soil bc rcstorcd so that surfacc runoff does not become channeled. 1Ve recommend that graded and disturbed slopes hc ( tracked in place with the equipment running perpendicular to the slope con[ours so that the track grouser marks provide a teature to help resist erosion. The south slope should be consiructed wilh a I bench (at least 5 feet ��ide) about half�vay up the slope to help prc��ent crosion and rills from forming on the slope due to shcet ilow runofT. A surface aatcr collection ditch should be constructed on the bcnch to com�ey water to a suitable discharge point. Some sloughing and � raceling of slopes with esposed or disturbed soil should be e�pected. Temporary erosion protection should be used and maintained in areas�eith exposed or disturbed soils to help minimize erosion and reduoe transport of sediment to adjacem areas and recciving ( waters. 'I�o reduce potential crosion and to help establish permanent vegetation on the slopes(especially I the slope south of [he site), we recommend that erosion protection of the slopes include hydroseeding and landscape planting in conjunction H�ith installation of an erosion control blanket. We recommend that the crosion control blanket be stakr.d to disturbed slopes to help reduce the risk Iof erosion during ��et ��ork periods and after the work is completed. R'e recommend that the erosion control blanket consist of Curlex 1 (manufacwred by American L-acelsior CoJ or 5150 I (manufactured by Norili American Green). We recommend that Ihe erosion control blanket be installed in accordance with the manufacturers recommendations and that the installation and stapling mcthods be observed during construction. � H}Tdoseeding and installation of the eirosion control blanket should occur as soon as possible � and prior to the wet winter months. Hydrosceding should ocwr to allow proper germination beforc � G e o [ n g i n e e r s 2� File No. 75gq.002-00-I I301050101 j/�V7 ', � "�0