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City of Santa Ana <br />September 25, 1992 <br />'r. <br />b. <br />76 2. 6. 4.4 <br />*23Jobl No: 01-3058-002-'01-00 <br />aitiliLog No: 2-2662 <br />-Page 14 <br />41·44*99 <br />The design/construction recommendations.· 4...3 <br />should .be 2, ;refiewed critically y :·,if' <62.- <br />..significantly*chigher Expansion Indices i i ·4%(8 )-; <br />..4 ,are obtained: ) 0 4%../72....?. .. irt.:20 .... <br />1 7.2.8 <br />t <br />Sul fate Content -4 23 + · .-- ......:3 ...1 gy,«.1... <br />Laboratory tests performed on representative · ·* ..' -,4 <br />samples of the on-site soils indicate that the fy.- r <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 />i <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 />.-I <br />I.V.V '.1 1.: <br />•L.al-Ff<,.·A - 0 .2