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Repon of Soils lnvestigation <br />2215 South Standard Ave., Proposed Addition <br />Santa Ana. California <br />Page 22 of 27 <br />Job No. 40-06i3 <br />April 5. 1999 <br />I <br />l <br />Retaining wall up to 10 feet high and backfilled using granular soils may be designed <br />using the following equivalent fluid weights: <br />Restrained Wall <br />non-eldin <br />The above values assume non-expansive backfill and free draining conditions. Measures <br />should be taken to prsvent moisture build-up behind all retaining walls. <br />Drainage measures should include free drainage backfill material and perforated drains, <br />as designed by the project architect or structural engineer (Figure 3). These drains should <br />outlet away from the structure. Walls should further be waterprooled in accordance with <br />the recommendations ofthe projea architea, Retaining wall footings should be designed <br />in accordance with the foundation design recommendations presented in this report and <br />reinforced in accordance with structural considerations. <br />10.5 Pavement Recommendations <br />-l <br />J <br />One sample of surficial soil believed to be representative ofthe site was obtained <br />for R-Value determination (Test Method 301 ). Based on testing, a design R- <br />Value of l0 was obtained for pavement thickness evaluation. The following <br />pavement recommendations are based on a 20-vear sen'ice lifle. <br />[QUIVALENT FLUID UNIT WEIGI{IS <br />(pound pcr cubic foot) <br />Level Backfill 2:l Slope backfill <br />Cantilever Wall <br />(yielding) <br />35 55 <br />s5 80 <br />I <br />l <br />I <br />) <br />I <br />I <br />I <br />10.5.1 General <br />I