2106 GRAND AVE 2016-01-01 MF Import

' �eorc-aiaacM sa�inxfw� sTuor E-12863 March 17,2007 ' Site Drainage ' During construction, the site must be graded such that surface water is collected and � tightlined to an appropriate drainage facility. Water must not be allowed to stand in areas where buildings, slabs, or pavements are to be constructed. Loose soil surfaces should be sealed by compacting the surface to reduce the potential for moisture infiltration. Final site ' grades must allow for drainage away from the building foundations. The ground should be sloped at a gradient of 2 percent in paved areas and 3 percent in landscaped areas for a distance of at least 10 feet from the building. � Footing drains may be installed around the perimeter of the building at or just below the invert of the footing, as shown on the "Typical Footing Subdrain Detail," Plate 4. Under no � circumstances should roof downspout drain lines be connected to the footing drain system. Roof downspouts must be separately tightlined to discharge. Cleanouts should be ii�stalled at strategic locations to allow for periodic maintenance of the footing drain and downspout � tightline systems. Permanently exposed slopes should be seeded with an appropriate species of vegetation to Ireduce erosion and improve stability of the su�cial layer of soil. Utility Support and Backfill IThe site soils should generally provide adequate support for utilities. Where loose soils or unstable conditions are encountered, remedial measures, such as overexcavating soft soils ( or compacting subgrade soils exposed in the trench bottom, may be required. In addition, caving of trench walls should be anticipated in trench excavations in the loose soil or where seepage is encountered in the excavation. IUtility trench backfill is a primary concern in reducing the potential for settlement along utility alignmenls, pariicularly 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 � provide support around the pipe haunches. Fill should be carefully placed and hand tamped to approximately 12 inches above the crown of the pipe before heavy compaction equipment I is brought into use. The remainder of the trench backfill should be placed in lifts having a loose thickness of less than 12 inches and compacted to the requirements of structural fill. � I 1 I � I EAR7}i CONSUl77NG INCORPORATED Paue t I