7100 HARDESON RD 2016-01-01 MF Import

Fisher 3 Sons, Inc. JN 97282 Page 7 August 19, 1997 a relatively short duration to allow for the construction of foundations, retaining walls, or uUlities. Temporary cut slopes should be protected with piastic sheeting during wet weather. The cut slopes shou;d also be backfilled or retained as soon as possibte to reduce the potential for instability. Ptease note that fill soils may have varying densities and can cave suddenly and without waming. Utiliry contractors should be made especially aware of this potenUa� danger. All pertnanent cuts into native soii should be inclined no steeper than 2:1 (H:�. Fill siopes should not be constructed with an inclination greater than 2:1 (H:V). Drainage Considerations Because the floor wiil be a slab-on-grade, we do not anticipate that footing drains will be required for most of the structure. However, we recommend the use of footing drains at the base of fooGngs, where (1) crawi spaces or basements will be below a sUucture, (2) a slab is below the outside grade, or (3) the outside grade does not slope downward from a building. Drains should also be placed at the base of all backfilled, earth-retaining wails. These drains shouid be surrounded by at least 6 inches of 1-incli-minus, washed rock and then wrapped in non-woven, geotextile filter fabric (Mirafi 140N, Supac 4NP, or similar material). At its highest point, a pertorated pipe invert should be at least as low as the bottom of the footing, and it shouid be sloped for drainage. All roof and surface water drains must be kept separate from the foundation drain system. The excavation and site should be graded so that surtace 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 grading in areas adjacent to the building should slope away at least 2 percent, except where the area is paved. General Earthwork and Structural Fill The pavement in the building area should be stripped and removal prior to placement of structurai fill. Structural fill. is defined as any fill piaced under a building, behind pertnanent retaining or foundation walls, or in other areas where the underlying soil needs to support loads. All sVuctural fill should be piaced 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 is very important and must be closely controlled during the filling and compaction process. The allowable thickness of the fill liR will depend on the material type seiected, the compaction equipment used, and the number of passes made to compact the lift. The loose lift thickness should not exceed 12 inches. We recommend testing the fill as it is placed. If the fiil is not compacted to specifications, it can be recompacted before another tik is placed. This eliminates the need to remove the fill to achieve the required compaction. The following tabi3 presents recommended relative compactions for structural fill: GEOTECH CONSULTAMS, [D7C•