PERMFILE66808 - Laserfiche WebLink

Home Browse Search

M98169GE • • All areas to receive fill should be stripped of all vegetation, organic soil material and other deleterious material prior to fill placement. Areas to receive fill material should be constructed with a toe key and benched into competent foundation material. The key and bench concept is shown on Figure 3. We should observe the toe key and bench preparation to verify that the toe key and bench extends into the underlying competent material. A drain system should be included at the bottom back of the toe key and at the back of several benches. This concept is shown on Figure 4. The drain system should consist of a drain pipe about three (3) to four (4) inches in diameter and surrounded by about three (3) to four (4) cubic feet per linear foot of drain of a Eree draining aggregate which is surrounded by an appropriate geotextile filter fabric. The drain should be graded to drain to positive gravity outlets. The outlets should be maintained to prevent them from becoming frozen or plugged and equipped with guards to prevent access by rodents or other animals. The fill material should be moisture conditioned to about two (2) percent wet of optimum moisture content placed in thin lifts and compacted to at least ninety (90) percent of the -aximum dry density as defined by ASTM D1557, modified moisture content-dry density relationship (Proctor) test. If the compaction equipment used for compaction of the fill has sufficient energy to compact thicker lifts the lift thickness may be adjusted to a thickness capable of compaction by the equipment used but should not exceed a lift thickness of about one (1) to one and one half (1.5) feet depending on the capabilities of the compaction equipment. The inclination of excavation cut or placed fill slopes based on our stability analysis will depend on the height of the slope. The height of the slope and the associated slope inclinations based on a calculated theoretical factor of safety of 1.5 are tabulated below. MAXIMUM SLOPE INCLINATION SLOPE HEIGHT On-site Soils (FEET) (HORIZONTAL TO VERTICAL) 0 to 10 2 to 1 10 to 15 2-1/4 Co 1 15 to 20 2-1/2 to 1 6 Lambert ana ~~~ociate~ CpN{ULTIND D{OTlDMMID~I IMDIN{{q ~MD YET{ID~I TEEi1N0