9606 19TH AVE SE McDONALDS Geotech Report 2018-01-02 MF Import

GEOTECHNICAL ENGINEERING STUDY McDonald's Corporation June 9, 1995 E-6893-1 Page 9 The site should be graded such that surface water is directed off the site. Water should not be allowed to stand in any area where structures, slabs or driveways are to be constructed. During construction, loose surfaces should be sealed at night by compacting the surface to reduce the potential for moisture infiltration into the soils. Final site grades should allow for drainage away from the building. The ground should be sloped at a gradient of three percent for a distance of at least ten feet away from the structures in landscape areas. This drainage gradient may be reduced to two percent in paved areas. Footing drains should be installed around the perimeter of the building at or just below the invert of the footing with a gradient sufficient to initiate flow. Under no circumstances should roof downspout drain lines be connected to the footing drain system. Cleanouts should be installed at several accessible locations to allow for the periodic maintenance of the footing drain and downspout tightline systems. We have provided a typical detail on Plate 3. Utility Su000rt and Backfill Based on the soil conditions encountered, the soils expected to be exposed by utility excavations should provide adequate support for utilities. Utility trench backfill is a major concern in reducing the potential for settlement along utility alignments, particularly in pavement areas. It is important that each section of utility line be adequately supported in the bedding material. The material should be hand tamped to ensure support is provided around the pipe haunches. Fill should be carefully placed and hand tamped to about twelve (12) inches above the crown of the pipe before any heavy compaction equipment is brought into use. The remainder of the trench backfill should be placed in lifts having a loose thickness of less than twelve (12) inches. A typical trench backfill section and compaction requirements for load supporting and non -load supporting areas is presented on Plate 4. Ewh Consult nts, Inc.