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(- � � <br /> INovember 10, 2000 G-1266 <br /> iGillette Residence Page 4 <br /> 5.2 Temporary E:uvation� and Slopa <br /> IThe site conditions are favorable for open cut excavations, because of the relatively level ground <br /> I surface of the lot, ihe available horizontal space to execute open cuts, and the good aoil <br /> � conditions. Due to the dense condition of the native glecial till soils at the site, temporary cuts in <br /> densetive dense sand soils at the site may be sloped as steep es O.SH:1 V, if approved end <br /> periodically monitored by the ga�tcehnical engineer. Under no circumstances should temporary <br /> excavation slopes be greater than the limits specified in local, state and federal govemment safety <br /> Iregulations. Where adequate space for desired temporary cuts is not available, shoring may be <br /> required to provide lateral support during excavation and construction. <br /> IWe recommend that a Geo Group Northwest representative be on site during excavation of cut <br /> slopes to evaluate slope stability, particularly if unanticipated groundwater seepage and loose soil <br /> ' conditions are encountered. <br /> I5.3 Stroctural Fill <br /> All structural fill material used to achieve design site elevations below the building erea and below <br /> � non-structurelly supported sidewalks and driveways should mcet the requirements for struccural <br /> fill. We anticipate that the on-site material will be suitable in its existing condition for use as <br /> st►uctural fill. Material to be used as st�Uctural fill should have the following specifications: <br /> i 1. Be free draining, granular material containing no more than five(5) percent fines <br /> � (silt and clay-size particles passing the No. 200 mesh sieve); <br /> 2. Be free of organic material and other deleterious substances; <br /> � 3. Have a maximum size of three(3)inches in diameter. <br /> Structural fill should be placed in thin horizontal lifts not excceding ten inches in loose thickness. <br /> Structural fitl placed under building areas (including foundation and slab areas), should be <br /> compacted to at least 95 �erc.ent of the maximum density, as detertnined by ASTM Test <br /> ' Designation D-1557A1 (Modified Proctor). <br /> Gso Group Northwat, Inc. <br /> 9�.t� <br />