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City of Santa Ana Job No: 01-3058-002201-00 <br />September 25, 1992 Log No: 2-2662 <br />Page 21 <br />Soil Pressure - flb/ftz/ft depth) <br />Soil Rigidly <br />Type Profile Unrestrained Wall Supported Wall <br />Active Pressure Level 45 - <br />2:1 upslope 60 <br />At-Rest Pressure Level 70 <br />2:1 upslope 100 <br />Passive Resistance Level 350 150 <br />(ignore upper 0.5 ft)2:1 downslope 175 75 <br />b. Friction coefficient - 0.40 <br />c. Where both friction and the passive resistance are <br />utilized for sliding resistance, either of the <br />values indicated should be reduced by 1/3. <br />d. These are ultimate values. <br />e.Pressure due to any surcharge loads from adjacent <br />footings,traffic,etc.,should be analyzed <br />separately. Pressures due to these'loadings can be <br />supplied upon receipt of the appropriate plans and <br />loads. <br />7.7 Backfill <br />a.Backfill should be placed under engineering <br />control. <br />b. It is recommended that granular, or relatively low- <br />expansivity, backfill be utilized, for a width <br />equal to approximately 1/3 x wall height, and not <br />less than 1.5 feet, subject to review during <br />-il---- -Ii-