9300 W MALL DR 2018-01-01 MF Import

G & M Inveatments November 11, 1993 P-3161 Page 9 All perm�nent cuta into native soils should be inclined no steeper than 2:1 (A:V). Fill slopes should not be constructed with an inclination greater than 2:1 (H:V). Water should not be allowed to flow uncontrolled over the top of any slope. Also, all permanentlp exposed slopes shoald be seeded with an appropriate species of vegetation to reduce eroaion and improve stability of the surficial layer of soil. DRAINA(;E CONSIDERATIONS We recommend the use of footing drains at the base of all footings an3 backfilled earth retaining walls. These drains � should be surrounded by at lEast six (6) inches of one-inch- minus washed rock wrapped in non-woven geotextile filter fabric (Mirafi 140N, Supac 4NP, or similar material). At the highest point, the perforated pipe invert should be at least as low as the bottom of the footing and it should be sloped for drainage. All roof and surface water drains must be kept separate from the foundation drain system. A typical drain detail is attached to this report as Plate 8. No groundwater was observed during our field work. However, seepage into the planned excavation is possible, and if encountered should be drained away from the site by use of drainage ditches, perforated pipe or French drains, or by pumping from sumps interconnected by shallow connector trenches at the bottom of the excavation. The excavation and site should be graded so that surface water is directed off the site and away from the tops of slopes. Water should not be allowed to stand in any area where foundations, slabs, or pavements are to be constructed. Final site gradinq in areas adjacent to the building should be sloped at least two (2) percent away from the building, except where the area is paved. GENERAL EARTHWORK AND STRUCTT]RAL FILL W= r.ecommend that the building and pavement areas be atripped and cleared of all surface vegetation, all organic satter, and other deleterious material. The stripped or removed materials ehould not be mixed with any materials to be used ae etructural fill. GEOTECH CONSULTF.NTS, INC.