1920 GRAND AVE 2016-01-01 MF Import

; sudace. If groundwater seepage or precipitation dismrbs the sudace, crushed rock may be required to stabiliu it and create a solid pad for the placement of the foundation. The fill encountered in the nocthem poRion of the building area will likely be excavat.;d during the cut for the foundation. It appears that the cut will extend below the fill line. If this is not the case,the unsuitable fill should be removc?or evaluated for support of the slab only. It is not recommended that spread footings be placed upon the fill. Excavatlon Conslderatlons Conventional hydraulic excavators should be able to excavate the foundation area for the st[ucture. Stability of the excavation sidewal►s should be considered by the contractor when planning the constcuction sequence. Excavation slope stability is the function of many factors,including the following: • the presence and abundance of groundwater, • the type and densiry of the soil strata, • the depth of the cut, • the surcharge loading adjacent ro the excavation,and • the length of time the excavation rcmains open. It should be the responsibility of the contractor to maintain safe slope configurations since the contractor is continuously on-site. It may be necessary to cover the s�:ies of temporary slopes with plastic or otherwise protect them from the elements to minimize sloughing and erosion. All temporary excavations should be shored or sloped back at one horizontal to one venical (1 H:1 V). The contractor should be aware that seeps may appear in the cut face during the excavation of the east building line. Groundwater was encountered in Boring k2 above the stiff silts at a depth of l3 feet. With groundwater at this elevatiun,the upper sands may become unstable at the contact with the silts. SWctural/ill is defined as Structural Flll that matenal which will be It is not anticipated that swcmral fill will be necessary during the coursr of placed lor the support ol the project. However, if needed, the suitabiliry of soil to be used for strucmral loundations, slab-on- ��depends upon the gradation, the amount of organics, and the moisture grade, roadways,parking �ontent of the soil when it is placed. Imponed fill consisting of clean, areas, and sidewalks. granular fill is recommended. Clean, granular fill should consist of well- graded sands or sand and gravel containing less than five percent fines,based upon that fraction passing the U.S. Standard No. 200 sieve. All swctural fill material should be placed in maximum 12-inch lifts and compacled to 95 percent of maximum dry densiry (MDD) according to ASTM � Port Gartlner Contlommiums-Geofechnical Report Paqe 5