12728 19TH AVE SE BASE FILE Geotech Report 2025-07-29

1 May 28, 2007 Proposed Office Building L&A Job No. 7A053 Page 9 ' have to be flattened and other measures taken to stabilize the slopes. Surface runoff should not be allowed to flow uncontrolled over the top of cut or fill slopes. Permanent cut slopes or fill embankments should be vegetated as soon as possible for long-term stability, and should be covered with clear plastic sheets, as required, to protect them from stormwater until the vegetation is fully established. STRUCTURAL FILL Structural fill is the fill that support structural or traffic load. Structural fill should consist of clean soils with particles not larger than four inches and should be free of organic and other deleterious substances. 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 soil that enable the soil to be compacted to the highest dry density for a given compaction effort. The on-site, clean, till soils may be used for structural fill only if their moisture content can be controlled to near their optimum moisture content at the time of placement. Imported material to be used as structural fill, should be clean, free-draining, granular soils containing no more than 5 percent by weight finer than the No. 200 sieve based on the fraction of the material passing No. 4 sieve, and should have individual particles not larger than four inches. The ground over which structural fill is to be placed should be prepared in accordance with recommendations in the SITE PREPARATION AND GENERAL GRADING and EXCAVATION AND FILL SLOPES sections of this report. Structural fill should be placed in lifts no more than 10 inches thick in its loose state, with each lift compacted to a minimum percentage of the maximum dry density determined by ASTM D1557(Modified Proctor Method) as follows: I LIU & ASSOCIATES, INC. I