9205 4TH AVE W 2025-12-03 - Laserfiche WebLink

July 2, 2008 Duplex Buildings L&A Job No. 8AO67 Page 17 the drain lines should have a sufficient gradient (0.5% minimum) to generate flow by gravity. The drain lines should be fitted with a non -woven filter fabric sock and completely enclosed in clean washed gravel. The remaining trench may be backfilled with clean onsite soils. Water collected by the perimeter footing subdrain systems should be tightlined, separately from the roof and surface stormwater drain lines, to discharge into a storm sewer or suitable stormwater disposal facilities. Surface Drainage Water should not be allowed to stand in any areas where footings, on -grade slabs,. or pavement is to be constructed. Finish ground surface should be graded to direct surface runoff away from the proposed triplex building. We recommend the finish ground be sloped at a gradient of 3 percent minimum for a distance of at least 10 feet away from the building, except in the areas to be paved. Cleanouts Sufficient number of cleanouts at strategic locations should be provided for underground drain lines. The underground drainlines should be cleaned and maintained periodically to prevent clogging. RISK EVALUATION STATEMENT The subject site is underlain at shallow depth by very -dense fresh till and/or dense advance outwash soils. These soils are of very -high to high shear strength and the site should be quite stable. It is our opinion that if the recommendations in this report are fully implemented and observed during construction and following the completion of construction, the areas disturbed by construction will be stabilized and will remain stable, and will not increase the potential for LIU & ASSOCIATES, INC.