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GEOMATRIX + The fill material should contain less than t/2 percent by weight of organics.and should be free of other objectionable materials (e.g., concrete, plastic, metal, and other wastes). Before fill is placed on any soil surface, organic-rich soils or other deleterious materials should be excavated and removed from the site. The upper 8 inches of exposed soil surface u PP any ex on P P which fill will be placed should be scarified,plowed, disked, and/or bladed until it is uniform in consistency and free of unbroken chunks and clods of soil greater than 4 inches in any dimension. The moisture content of the soil should then be adjusted to the optimum, or as y much as +3 percent of the optimum, and should be compacted with equipment suitable for the soil and site conditions. The soil should be compacted to not less than 90 percent of maximum dry density as determined using ASTM Method D1557- Fill should be placed on the prepared site in horizontal lifts that do not exceed 8 inches in thickness before compaction. The fill should be compacted with suitable equipment to no less than 90 percent of maximum dry density as determined using ASTM Method D1557. The final k surface of the compacted fill shouid.be graded to promote good surface drainage, as described later below. 5.2.6 Drainage Requirements Final grades and pavements should be adequately sloped to direct surface water away from foundations and slabs and toward suitable discharge facilities. Ponding of surface water should not be allowed anywhere on the pump station site. The water from downspouts of the pump station should be directed in closed pipes to storm drains or other appropriate points of discharge. 5.3 FOUNDATION RECOMMENDATIONS The walls of the pump station may be.founded on shallow, strip-type footings that are integrally Poured with the pump station slab-on-grade.floor. The maximum allowable bearing pressure � for dead and live loads for the shallow footings should be 1000 psf. This pressure may be increased by one-third for short-term wind and seismic loading. Footings should be at least 2 ; feet wide. The bottoms of the footings should be at least 12 inches below adjacent final grade. �. I F The pump station slab should be designed in accordance with recommendations presented in Section 5.4, Slabs on Grade. I:1Proj ect15000s153 13TE W I S-MAN.DOC �J 10 I