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City of Santa Ana <br />September 25, 1992 <br />Job No: 01-3058-062 <br />Log No: 2-2662 <br />Page 22 <br />-bi-00 <br />construction.(This is to reduce lateral <br />pressures.) <br />C.The granular backfill should be capped with at <br />least 18 inches of relatively impermeable material. <br />d.Backfill should be compacted to achieve a minimum <br />90 percent relative compaction, the compaction <br />standard being obtained in accordance with ASTM: D <br />1557. <br />e.Precautions should be taken to ensure that heavy <br />compaction equipment is not used immediately <br />adjacent to walls, so as to prevent undue pressures <br />against, and movement of, the walls. <br />f. The use of water-stops/impermeable barriers should <br />be considered for any basement construction, and <br />for building walls which retain earth. <br />7.8 Backfill Drainaqe <br />a. i. Subdrains should be provided in the backfill, <br />or weepholes/weepslits should be provided in <br />retaining walls.(It is recommended that <br />subdrains be provided for walls over 51 feet <br />high, for retaining walls which form part of a <br />building structure, and where any staining or <br />efflorescence due to dripping from <br />weepholes/weepslits would be aesthetically <br />unacceptable.) <br />L-- <br />&--- ..'--Il. <br />-- <br />------ *./.I.*.- <br />.. <br />1. <br />. 1. <br />1