7425 HARDESON RD BASE FILE 2016-01-01 MF Import

�� � , � � � � GEOTECHNICAL ENGINEERING STUDY Trace and Associates July 79, 2005 E-11680 Page 12 If seepage is encountered in the foundation, stormwater control vault, or utility excavations during construction, the bottom of the excavatiun should be sloped to one or more shallow sump pits. The collected water can then be pumped from these pits to a positive and permanent discharge point. Depending on the magnitude of such seepage, it may also be necessary to interconnect the sump pits by a system of connectortrenches. ECI's representative, if needed, should determine the appropriate locations of subsurface drains, during grading operations, at which time the seepage areas, if present, may be more clearly defined. � During construction, the site must be graded such that surface water is directed away from the proposed building areas and areas to receive fill, Water must not be allowed to stand in areas where tlie buildinc�s, slabs, or pavements are to be constructed. Loose , surfaces should be sealed by compacting surfaces to reduce the potential for moisture infiltration into the soils. Final site grades must allow for drainage away from the � building foundations. The ground sfiould be sloped at a gradient of 3 percent for a distance of at least 10 feet away from the proposed buildings, excepi in paved areas, which can be sloped at a gradient of 2 percent. � � � � � � � Q � Footing drains sl�ould be installed around the penmeter of the buildings, at or just below the invert of the footing, with a gradient sufficient to initiate flow. A typical detail is provided on Plate 3. Under no circumstances should roof downspout drain lines be connected to the footing drain system. Roof downspouts must be separately tightlined to discliarge, Cleanouts should be installed at strategic locations to allow for periodic maintenance of the footing drain and downspout tightline systems. Utility Support and Backfill The site soils sliould generally provide adequate support for utilities. Where loose soils or unstable conditions are encountered, remedial measures, such as overexcavating sott soils or compacting subgrade soils exposed in the trench bottom, may be required. Caving of trencli walls should be anticipated in trench excavation. 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 is adequately supported in the bedding material. The material should be hand tamped to ensure support is provided around the pipe haunches. Hanh Consuhanis. Inc.