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V'R <br /> ,�. Project No. 90161.e <br /> 7 Sune 1990 <br /> ''' Under round Facilities Construction <br /> j . <br /> 1. Trenches greater than 5 feet in dapth should be provided with <br /> Lad <br /> E : <br /> shoring or sloped back at a 1:1 slope in accordance with Cal-osha <br /> regulations. <br /> t . <br /> F 2, It is-suggested that native soil be used for backfill within <br /> structural areas and for five feet beyond the building footprints <br /> Asa <br /> E ; <br /> to inhibit rapid lateral migration of drainage and irrigation <br /> Beo <br /> nd the 5 <br /> foot distance, on-site or import soil may <br /> waters. y <br /> '.; be used. A lean corcret trench plug may also be utilized at the <br /> foundation line to achieve the desired results- Compaction of i <br /> E <br /> tcs <br /> E _ <br /> the backfill should be by mechanical methods. Jetting is not <br /> j recommended. <br /> i:3 3. All soil backfill, placed after the underground facilities <br /> 1 have been installed, should be compacted to the same compaction <br /> >a <br /> as the surrounding soil within the structural areas and 85% in <br /> ompaction should be accomplished using lifts <br /> landscaped areas. C <br /> which da not exceed 8 inches, however, thickness of the lift <br /> should be determined by the contractor and if a thicker lift is <br /> desired, and he can achieve the required compaction, the method <br /> will be acceptable. <br /> U. <br /> 16 <br />