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City of Santa Ana r Job No: 01-3058-002-01-0 <br />September 25, 1992 Log No: 2-2662 <br />Page 14 <br />b.The design/construction recommendations <br />should be reviewed critically if <br />significantly higher Expansion Indices <br />. . 1 -4are obtained.) <br />7.2.8 Sulfate Content <br />Laboratory tests performed on representative <br />samples of the on-site soils indicate that the <br />sulfate content of the surface soils is less <br />than the 0.2 percent which is indicative of an <br />adverse sulfate condition.Type II cement is <br />therefore considered adequate for concrete in <br />contact with on-site soil. <br />7.2.9 Utility Trenches <br />a.Bedding material should consist of sand <br />with an SE not less than 30, which may <br />then be jetted.(Jetting may not be <br />effective if adequate drainage is not <br />available.) <br />b.Existing soils may be utilized for trench <br />backfill,provided they are free of <br />organic materials and rocks over 6 inches <br />in diameter. <br />C.Backfill of all exterior and interior <br />trenches should be compacted to achieve a <br />relative compaction of not less than 90 <br />percent, the compaction standard being <br />- Ill--0. <br />4- - I.--*.£*.:D *14'f