4808 BELVEDERE AVE 2016-01-01 MF Import

Timberbuild Homes JN 05357 September 20, 2005 Page 9 All permanent cuts into native soil should be inclined no steeper than 2:1 (H:V). Compacted fill slopes should also not be constructed with an inclination greater than 2:1 (H:�. To reduce the potential for shallow sloughing, fill must be compacted to the face of these slopes. This can be accomplished by overbuilding the compacted flll and then trimming it back to its final inclination. Adequate compaction of the slope face is important for long-term stability and is necessary to prevent excessive settlement of patios, slabs, foundations, or ather improvements that may be placed near the edge of the slope. Water should not be allowed to flow uncontrolled over the top of any temporary or permanent slope. All permanently exposed slopes should be seeded with an appropriate species of vegetation to reduce erosion and improve the stability of the su�cial layer of soil. Topsoil is often placed on regraded slopes to promote growth of vegetalion. Proper preparation of the regraded surface, and use of appropriate topsoil is necessary to prevent the topsoil from sliding oH the slope. This is most likely to occur following extended wet weather if a silty topsoil is used. On steeper slopes, it may be necessary to "track walk" the slope or cut small grooves across the slope prior to placing the topsoil. Any disturbance to the existing slope outside of the building limits may reduce the stability of the slope. Damage to the existing vegetation and ground should be minimized, and any d�sturbed areas should be revegetated as soon as poss�ble. TEMPORARY SHORING A variety of shoring systems are feasible for use at this site. This section presents design considerations for cantilevered or tied-back soldier pile walls and for nailed walls. Since the most suitable choice is primarily dependent on a number af factors under the contrador's control, we suggest that the contractor work closely with the structural engineer during the shoring design. The design should be submitted to Geotech Consultants, Inc. for rAview priar to beginning site excavation. We are available and would be pleased to assist in this design effort. Cantilevered soldier pile shonng systems have proven to be an e�cient and economical method for providing excavation shoring. They are typically economical where the depth of excavation is greater than 15 feet. Soldier Pile Installation Soldier-pile walls should be constructed prior to commencing the excavation by setting steel H-beams in drilled holes and grouting the spaces betweon the beams and the soil with concrete for the entire height of each drilled hole. We anticipate that the holes could be drilled without casing, but the contractor should be prepared to case the holes or use the slurry method if caving soil is encountered. Excessive ground loss in the drilled holes must be avoided to reduce the potential for settlement on adjacent properties. If water is present in a hole at the time a soldier pile is poured, concrete must be tremied fo the bottom of the hole. As excavation proceeds downward, the space between the piles should be iagged with treated timber, and any voids behind the timbers should be filled with pea gravel or a sand and fly ash slurry. The prompt and careful installation of lagging is important, particularly in loose or caving soil, to maintain the integrity of the excavatio� and provide safer woricing conditions. Additionally, care must be taken by the excavator to remove no more soil GEOTECH CONSULTANTS. INC.