11825 AIRPORT RD 2016-01-01 MF Import

I ,wy r.��e � Nonhern, ��c. � vroHa w+.z�e-aw Although the native, on-site smdy sildsiity saad obaerved above the mtive r �aed/gnvelly sand layer exhibited stiff/medium dense coasistency, it is our opinion thac thu � �ildsilty xnd is aot witable for the support of engineercd swcdua siace washing of thia mater.al into the underlyin3 coarse sand and sandy gravels may occur in response to a � tluchuting groundwater tablq resulting in the lou of bearing underneath the proposed footings. ( We conclude that a conventional spread footiag foundation with slab-on-�rade consuuaion may be utilizcd for t6e proposed building Due W the loose toils and extaa of u�ontrollcd 511 u the site, proper wbgade prepazation will be a key element of buildiag � foundatioa and slsb placement. Two altemadves for accomplishing this task are praented io the Foundation Placement section of this report. � 6.0 PRELIMINARY RECOMMENDATIONS L T6e following geotechnical rocommendations are prdimivary,as tluy are based on au current understanding of the proposed pruject.We ncommeed that we be engaged to review the project plans in order to provide revised,sugmented,or additioael geotechnical r recommendations as required. L � 6.1 Subgrade Preparaflon We rocommead stripping and nmoving topsoil,or other organic soils, and t uacoauolled fill from the proposed building areas prior to foundadon and siab placement. L Once the vegetatioq orgaaic soils,uncontrolled fill,and loose native wils have been � removed,preparation of a witabt�building foundation and slab subgrade should proceed ia accordana wit6 tlu recommendatioas given in the Fonndation Placemeat and Slab-on- Yrade sections of this report. � The proposed UST's can be placed directly on subgrade coosisting of the native soils exposed at the bottom of the proposed UST excavatioa � The surficisl on-site soils are moisture xasitive due to the content of fines in t6e soil. The wnstruction of temporary roadways using quazry spalls, compacted 511,or geotactile � fabric, may be necessazy to minimize the disturbance of the on-site soils and to provide a working surface for consuuction traffic. , � We recommend d�at we be mgaged w provide on-site recommendations for stabilizadon of wet wils during consUvction and obsecve subgrade preparation and accavation � so that soil conditions can be continuously monitored. r � 5