1901 MERRILL CREEK PKY 2018-01-01 MF Import

by a representative from our fitm to determine if the procedures conform with the intent of this report and thn plans and specifications. A representative number of in-ptace density tests should be perfonned to verify that the required compaction is being achieved. SLOPE CONSIDERATIONS I Temporary and Permenent Stopes For plazuung purposu,wc suggut temporary cut slopes of O.SH:1V(horizontal to veRical) � in the very decv�^nati�e till soils, and 1H:1V in all other soil types. Thae inclinations may have i to be modified by the contractor if localized sloughing occurs. Since the coutractor has contro �. of the construction operations, he should be made responsible for the stability of cut slopes, as ! ` well as the safery of the excavations. All shoring and temporary slopes must confortn to applicable local, state and federat safety ngulations. We recommend permanent cut slopes in the dense to very dense glacial till be inclined no � steeper than 1'hH:1V. Permanent cut slopes in all other soils should be in•:lined no steeper than ,� 2H:1V. � As discussed in the previous sxtion, all fill placed on existing slopes s�ould be properly keyed into the native soils. We rewmmend permanent fill slopa be inclined no steeper than � 2H:1V. aSlope Setbacks � ' With the exception of the extreme notthwest corner of the site and along Mettill Ring r., Creek, we understand that the planned grading activitia will result in finished slope inclinations on the otder of 20 percertt or las. In the northwest comer and near the creek, native slopes inclined between about 30 to 50 percent will remain undisturbed. We recommend that appropriate building setbacks and/or stn►ctural elements be used to avoid adverse impacts on or from sceep slopes. If appropriate erosion and drainage controls are implemented duting and maintained after const�uction, we recommend a building setback or dapened foundation to maintain a setback of 25 feet or H/3 (where H is the vertica: height of the slope), w6ichever is ' greater. Slope Stability Small portions of the steep bank along Merrill Ring Creek near the eastem properry boundary of the site are sioped at greater than 50 percent. Our reconnaissance rovealed no obvious indications of deep-seated slope instability, though su�cial erosion and sloughing was observed whea surface water is concentrating on the slope face. Based on our cbservations, it is our opinion that the slopes are presently stable, with the exception of very small areas immediately adjacent to the creek where areas of surface water concentration are causing normal 1 incision procasa and small areas experiencing shallow sloughing activity because of localiud G e o E n � I n e e r s 9 FOe No. U60-0Of-73•1170/l l 1t97