1632 46TH ST SE 2020-06-18 - Laserfiche WebLink

July 3,2017 Single-Family Residence 1.,84A Job No. 17-079 Page 11 if the recommendations in this report are fully implemented. Stability of the slope can be further enhanced by clearing the lower 15 feet of the steep slope, lining the cleared area with a layer of non-woven filter fabric (Mirafi IONS), and covering the liner with a minimum 10-inch layer of 2-to-6-icnh rock spalls. The rock stacked liner will be able to allow water to seep through while keeping soils on the slope in place. ONSITE STORMVVATER DISPOSAL Stormwater over impervious surfaces, such as roof and paved driveway, should be captured by underground drain line systems connected to roof downspouts and by catch basins installed in paved driveway. Collected stormwater should be tightlined to convey into an elevated spreader pipe system and to disperse onto a gently-sloped and well- vegetated area at the base of the steep slope. The spreader pipe dispersion system is shown on Plate 6. The spread pipe should consist of 4-inch, perforated, rigid, PVC or aluminum pipe. The length of the pipe should be based on one foot per 50 s.f. of impervious surface. STRUCTURAL FILL Structural fill is the fill that supports structural or traffic load. Structural fill for grading work should consist of clean granular soils free of organic, debris and other deleterious substances and with particles not larger than three inches. Structural fill should have a moisture content, within one percent of its optimum moisture content at the time of placement The optimum moisture content is the water content in the soils that enable the soils to be compacted to the highest dry density for a given compaction effort Onsite clean soils meeting the above requirements may be used as structural fill. Imported LIU & ASSOCIATES, INC.