5902 EVERGREEN WAY HOUSING HOPE 2018-01-01 MF Import

I Subsurface Erploration, Grologic Kazard, and � Nousing Hvpe Pharr 1f Prefiminary Gtorechnical Er.qinerring Report Evenrr, N'arhingron D�sign Recommendationr � least 95 percent of ASTbf:D 1557. In addition, a 1.SH:1V line extending down from any footing must not daylight because sloughing or raveling may eventually undermine the footing. 'I'�us, footings should not be placed near the edge of steps or cuts in the bearing soils. � Anticipated settlement of footings founded as described above should be on the order of �4 � inch or less. However, disturbeci soil not removed from foot�ng excavatioas prior to footing placemrn[ could result in increaseci setdements. All footing areas should be inspected by AESI prior to pla�ing concrete to veri(y that the design beazing capacity of the soils has been attained � and tha[ construction conforms to the recommendations contained in this report. Such inspections may be required by the goveming municipaliry. Perimeter footin� drains should be provided as discussed under the section on Drainage Considerations. 1 . 12.0 RETAINING �VALL CONSIDERr1TIONS I �Ve recommend retaining, buttressing, or otherwise reinforcing the steep slope along the west marein of the proposed building area. Depending on planned finished floor elevations for the � south structure, it may be necessary to retain cut slopes along the south property as well. Several options are available for mitigation of shallow surficial landsliding on the west slope. � These include cast-in-place concrete retaining walls, suldier pile walls, soil nailing, and GeoeridT" reinforced modular block walls or rockeries. Of these op[ions, soldier piles and soil nailing w•ould likely be cost prohibitive. Reinforced fill with modular block (e.g., KeystoneT") I wall or rockery facings ��•ould likely be the least expensive option. Therefore, we have included eeneral'ued recommendations for conswction of cast-in-place walls and GeogridT" reinforced modular block walls or rockeries in the following sections. Once a wall rype is 1 chosen, we can assist the design team with more specific wall evaluation and design support. 12.1 I.ateral �Vall Pressures - � Al! backfill behind walls or around foundation units s6ould be placed as per our recommendations for structural fill and as described in this section of the report. Horizontally � backfilled walls that are free to yieid laterally at least 0.1 percent of their height may be designed using an equivalent fluid euual t�� 35 pounds per cubic foot (pe�. Fully restrained, � horizontally backfilled rigid walls that ca�mot yield should be designed for an equivalent Fluid of 50 pcf. If parkiag areas are adjacent to walls, a surcharge equivalent to 2 feet of soil should be added to the wall height in determining lateral design forces. Surcharges from the adjacent I building footings, heary cons[ruction equipment, or sloping ground must be added ro the above values if they encroach within the active soil wedge be6ind the wall. For permanent 2H:1V soil backslopes, we recommend design equivalent fluid pressures of 50 and 75 pcf for active i and at-rest conditions, respectively. � IFebruary 11, :fA2 ASSOCIATED E.1R7N SClENCE$ /NC. r SGH/fd�KEDI:+DA1�Pro��rn�:fl7/7�9�XE�WP.fVSK Pagc 12 I� ; /.�a