7815 E GLEN DR 2016-01-01 MF Import

Option 2• Drilled Pier Support Another alternative would be to support the slab on drilled piers. The drilled piers would be constructed as discussed under the section on Foundations. The spacing of the drilled piers would be detertnined by a structural engineer based on the aznount of reinforcement included in • the floor slab design and the a:nount of acceptable settlement or deflecdon of the slab. O�tion 3: Floatin�Floors Another alternative would be to "float" the slab on a thin structural fill mat. After overexcavating at least 2 feet below finish floor grade and recompacting the underlying soils to a firm and unyielding conditiun, a structural fill mat wouid be placed in accordance with the recommendations presented in the Structural Fill section of this report. After the fill is completed and approved, the capillary break material, moisture barrier, and sand layer may be placed on the floor slab cast. The floor slab should not be tied into the building's foundation but should be free to settle independent of footings. Floating floor slabs should contain bar reinforcement to reduce differential mov�ment across any cracks which might develop. 14.0 DRAINAGE CONSIDERATIONS All retaining walls, perimeter footing walls, or peruneter grade beams should be provided with a drain at the footing or grade beam elevation. Drains should consist of rigid, perforated, PVC pipe surrounded by washed pea gravel. The level of the perforations in the pipe should be set approximately 2 inches below the bottom of the footings or the bottom of the grade beazns cast atop the drilled pier foundation. The drains should be conscructed with sufficient gradient to allow graviry discharge away from the building. In addition, all retaining walis should be lined wi�h a minimum 12-inch thick washed gravel blanket or approved drainage board provided over the full height of the wall, which ties into the footing drain. Roof and surface runoff should not discharge into the footing drain system but should be handled by a separate, rigid, tightline drain. All storm water runoff must be tightlined into an approved storm water drainage system. In planning, ex[erior grades adjacent to the building should be sloped downward away from the structure to achieve surface drainage. Other site drainage improvements may be necessary depending upon actual site development plans and the soil and ground water conditions encountered. We are available to provide recommendations if necessary. 15.0 PROJECT DESIGN AND CONSTRUCTION MONI'I'ORING We are available to provide additional geotechnical consultation as the project design develups and possibly changes from that upon which this report is based. Since no grading or coiutruction plans were available at the time this report was prepazed, we recommend that AESI perform a geotechnical review of the plans prior to final design compledon. In this way, 14