3210 36TH PL NE 2018-01-02 MF Import

• No traffic,construction equipment, stockpiles or cons[ruction supplies be allo�ved at the rop of dic cut slopes widiin a distance of at least 10 feet from the top of ihe slope. • Gxposed soil along thc slope be protccted from surface erosion using waterproof tarps or pl�stic sheeting. • Construc[ion activities be scheduled so that thc length of time the temporary cut is Ic'� uprn is reduced to the extcnt practical. • Grosion eontrol measures be implemented as appropriatr such thct nmuff lrom the site is rcduced to the extent practical. • Surface water is divertcd away from the excavation. • The general condition of the slopcs be observed periodicaily by a eco'schnical engin�cr tu confirm adequate staUility. Since the contractor has control of the construction operations, the contractor should be made responsible for the stability of cut slupes, as �vell as the safcry of the excavations. All shoring and temporary slopes must conform to applicablc local, statc and fcdcral safety regulations. I Permanent Slopes I' I Wc recommend that permanent cut anJ fill slopes be constructed no steeper d�an 2H:1 V. Tu achieve uniforn� compaction, we recommend Qi�t fill slopes be overbuilt by about 2 fect and subsequendy cut back to expose properly compacred till. To minimize erosion, newly conswcted slopes should be planted or hydroseeded shortly after completion of g:ading. Until the vegetation is established, some sloughing and ra��eling of the slopes should be expected. This may rcquiro localized repairs and reseeding. Temporary covcring, such as clear heavy plastic shecting,jute fabric, loose straw or rolled erosion control mats should be uscd to protcct the slopes during periods of rainfall. PRELOAD FILL IWe recommcnd placing a prcload till in the arca of the a��gregate stockpiles, aggregate bins, [he batch plant, and oiher settlement-sensitive sln�ctures. 'l�he purpose of the preload till is tu pre-induce a major I portion of the setdement that would othenvise occur when site fill, stockpile, and strucWre loads are applied. In the area of the pile supported Uatch plant and aggregate bins, the preload fill will reduce the differential setdement realized betwcen the pilc supported structures and the surrounding site grades. We � recommended that prcloading be completed prior to installation of pile founda[ions. Preload Height I For planning purposes, we suggcst a preload hcight of at least 5 feet above the finished grade elevation. The preload hcight is the thickness of die preload till that is placed abo��e the finished grade elevation. }{�Sher preloads may be necded depending on planned structures/loads of the site. The crest of the preload should extend laterally at least 5 feet beyond [he footprint of the structures in each direction. [t may be beneficial to expand the preload arcas in case the locations of stockpiles or structures are expectcd to movc. The preload fill should consist of structural fill quality material compacted only to the extent necessary to support construction equipment. Side slopes should be planned no steeper than IH:IV. The preload surface should be crowned slightly to promute drainage of surface water. Fi(cNo.8937-OOi-00 Pagc 10 �iEOENGINEEB� OtmGcr l l. ?OU/ � � ..:z. _ _ .. . . . r .., ��q.{ r' . � �. �. - �.�� x �" . �:;. :�, �ir 3 � '�( +. �i� ...�' .. . �y �� - .� �r r i. �f'•. 4 . __.l��i�.__ '� ��C'A�� '"�wr = _ '..I� / � � . � ..�. . .. r. _ i rv � , , _ � z