2710 VIEWCREST AVE 2016-01-01 MF Import

Thomas Kelly JN 95192 June 7, 1995 Page 7 outside grade dces not slope downwards irom a building. Drains should also be placed at the base of all backfilled, earth-retaining walls. These drains should be surrounded b� at least 6 inches of 1-inch-minus, washed rock and then wrapped in nan-woven, geotextile filter fabric (Mirafi 140N, Supac 4NP, or similar material). At its highest pc?nt, a perforated pipe invert should be at least as low as the bottom of the footing, and it should ba sloped for drainag�. All roof and surface water drains must be kept sepazate from the foundation drain system. For the best long-term performance, perforated PVC pipe is recommended for the footing drains. The exca��ation and site shouid 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 toundations, slabs, or pavements are to be constructed. Final site gradi:.g in areas adjacer.t to the building should slope away at least 2 percent, except where the area is paved. Water from roof, stormwater, and foundation drains should not be discharged onto the slope; it should be tightlined to a suitable outlall located away from the slope. If a storm drain is not available, the water may be discharged into a properly designed infiltration or disFersion trench located at least 15 feet from the iop of the slope. G�[Leral Earthw�k and Structu�iQ All building and pavement areas should be stripped of surface vegetation, topsoil, organic so�ls, and other deleterious rr�terial. The strippcd or removed materials should not be mixed with any materials to be used as struciural fill, but they could be used in non-structural areas,such as I.iiidscape beds. Structural fill is de(ined as ar.�y fill placed under the building, behind permanent retaining oi foundation walls, or in other areas where the underlying soils need to support loads. AII structural fill should be placed in horizontal lifts with a moisture content at, or near, the optimum moisture content. The optimum moisture content is that moisture content that results in the greatest compacted dry density, The moisture content of fill soils is very important and must be closely controlled during the (illing and compaction process. The allowable thickness of the fiil lift will depend on the material type salected, the compac- tion equipment used, and the number of passes made to compact the lift. The loose lift thickness should not exceed 12 inch,:s. We recommend testing the fill as it is placed. If the fill is not compacted to specifications, it can be recompacted before another lift fs placed This will eliminate the need to remove the fill to achieve the required compaction. Thc following table presents recommended relative compactions for structural fill: GIiOl7iCl I CONtiUCPANIS,INC