2522 RUCKER AVE 2018-01-01 MF Import

rGcotechnical Enginaring Report • G�rdener Group Condominiums I luly 16, 1997 NCA File No.209297 Page 10 Iof the well in lifts not excading 8 inches in loose chickness and compecting this zone with I.and operated Iequipment. ( '[he above lateral pressures may be resisted by friction at the base of the wall and passive resistnnce against the foundation. A ccefficient of friction of 0.5 may be used to determine the base friction in the glacial soils. An equivalent fluid density of 300 pcf should be used for passive rosistence design. 'R�ese � recommended values incorporate safety factors of 1.5 and 2.0 applied to the estimated ultimate values for frictional and passive resistance,respectively. To achieve this value of passive pressure,the foundations Ishould be r�oured "neat" against the netive dense soils, or compacted fill should be used as backfill against the front of the footing, and the soil in front of the wall should extend a horiwntal distance at Ileast equal to three times the foundation depth. We recommend that the upper 1 foot of soil be neglected when determining the passive resistance. IA dreinage system should be plenned behind all of the sabgrade walls. For standerd cantilever wall construction, an 18- inch- wide blanket of free-draining sand or pea g�avel placed behind the wall is I recommended. A pecforated pipe should be placed along !he base of the wall within the free-draining material. 'Ihe elevetion of the pipe should be a minimum of 12 inches below the interior slab or Ipavement elevation. The pipe should be routed to an appropriate discharge point or the stortn drainage system. IPavements 'fhe first level of parking is anticipated to be paved. Pavement subgrade preparation, swctural filling i where required, and drainage should be performed as recommended in the pfevious Site Preparation and Structural Fill sub-sections. The subgrade should be proofro��ed with a heevY T�bber-tired piece of �� equipment to identify soft or yielding arees that require repair. We should be reteined to observe the � proofrollin�prior to placemant of the asphalt or hard sudaces. � Slabs-On-Grade l Any slab areas should be prepared such that the underlying soil is dense and non-yielding. ere moisture control is important, we recommend that the slab floors ba underlain by 6 inches of free- draining sand or gravel for use as a capillary break. A suitable vapor berrier such as Meevy plastic sheeting should be placed over the sand or gravel. A 2-inch thick sand blanket may be used to cover the � vapor barrier to sid in curing the concrete. The capillary break material should be allowed to drain into Ithe foundation drain system. I NELSON-COUYRETTE&ASSOGATES. RVG