7920 EVERGREEN WAY 2018-01-01 MF Import

GEOTECHNICAL ENGINEEF G STUDY ]' E-8879 McDonald's Corporation Page 6 August 30, 1999 Site Drainaae Groundwater was encountered six to twelve feet below grade during our subsurface exploration. Seepage, if encountered in excavations during construction, should be collected by sloping the bottom of the excavation to one or more shallow sump pits The collected water can then be pumped from these pits to a positive and permanent discharge, such as a nearby storm drain. Depending on the magnitude of such seepage, it may also be necessary to interconnect the shallow sump pits by a system of shallow connector trenches. The construction area should be graded such that surface water is directed off the site. Water should not be allowed to stand in any area where buildings, slabs or pavements are to be constructed. During construction, loose sur�aces 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 foundations. We suggest that the ground be sloped at a gradient of three percent for a distance of at least ten feet away from the buildings except irt areas that are to be paved, which can be sloped at a gradient 6f two percent. Footing drains should be installed around the building perimeters, at or just below the invert of the footing, with a gradient sufficient to initiate ilow• A iypical detail is provided on Plate 3. Under no circurristances should roof downapout drain lines be connected to the footing drain system. Roof downspouts must be separately tightlined to discharge. Cleanouts should be installed at strategic locations to allow for periodic maintenance of the footing drain and downspout tightline systems. Utilitv Suaoort and Backfill The site soils expected to be exposed in utility excavations s:--�J provide adequate sup[�ort for utilities. Adequate compaction of utility trench backfill is a primary 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 suppo�t is provided around the pipe haunches. Fill should be carefully placed and hand tamped to at least twelve (12) inches above the crown of the pipe before any compaction equipment is used over the pipe. The remainder of the trench backfill should be placed in lifts having a loose thickness of iess than twelve (121 inches. A typical utility trench backfill section and compaction requirements for load supporting and non- load supporting areas is presented as Plate 4. Eorth Coneultento, Inc.