1718 ENGLAND AVE 2016-01-01 MF Import

fGcotcchnical Enginccring Evaluation Englund Avenuc Lot � Junc 2,2005 NGA Filc No.411305 Page 7 � groundwatcr, if cncountcrcd, should be interccptcd with cut off dnins and routed outsiJe of the planned grading area, or the groundwater should be controlled with sump-pumps or dewatering systems. ( Temporary and Permancnt Slopes I Preliminary plans indicate that cuts up to 28 fect bclow the current grade are antic��,ated for the dayli�ht basement of the proposed residence. Temporary cut slope stability is a function o( many factors, includino the type and consistency of soils, depth of lhe cut, surcharge loads adjacent to the excavation, IIength of tim� a cut remains open and the pn;sence of surface or groundwater. It is exceedingly difficult under thcsc variable conditions to estimate a stable, temporary, cut slope anglc. Thcreforc, it should bc Ithc responsibility oF the contractor to maimain safe slope configurations sincc hc is continuously at thc job site, able to obscrvc thc n:uure and condition o� the cut slopcs, and able to monitor thc subsurface imatcrials and groundwatcr conditions cncountcred. IThc following inlbrmation is provided solcly for the bcnefit of the owner and other design consultnnts and should not bc constnicJ to imply that Nclson Geotechnical Associates, Lu. :�ssumes res��nsibility forjob Isitc safcty. Job sitc safcry is thc solc resprnisibility of thc projcct co�tractor. I Por planning purposes, we reconunend that temporary cuts in �he dense s:md be no stecper ihan 1.5 I-[orizontal to I Vertical (I.SH:1V). Loose surficial soil was encountered to depths of 2 to S (eet in the � borings. Wc rccommend that temporary cuts in the loose soils be no steeper than 2FI:IV. If perched I �roundwater or silt Inycrs are encountered, we would e�pect that O:uter inclinations would be necessary. �Ve recommend that cut slopes be protected from erosion. Erosion control measurcs may include I I covering cut slopes with plastic sheeling and diverting sur(ace runoff away from tne top of cut slopes. We do not recommend vertical slopes for cuts deeper than (our feet, if worker access is necessary. �Yc recommend Ihat cut slope hcights and inclinations conform to appropriate OSHA/WISHA regulations. . . . , , wet ' If thcse tcmporary inclin.itions .irc no[ f�asiblc, du� to boimdary constraints ancUor loosc and conditions,shoring or a combination of safe slope inclination and shoring or temporary shoring should be considemd. Dctailcd grading plans will be essential for successful constn�ction on this steeply sloping sire. We strongly recummend th,u we be retained ro revicw gradin�pl:ms prior to conswction. INELSON GEOTECHNICAL ASSOC/ATES, INC. 1