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•Merila and Associates <br />STS Project 93492 <br />December 19, 1984 <br />-13- <br />is possible that some existing fill is suitable for the support of the <br />added fill in driveway and parking areas only. If this is the case, <br />the existing fill should be subcut as necessary and proof -rolled prior <br />to addition of any new fill. Soft areas should be removed and replaced <br />with properly placed and compacted fill. An experienced STS technician <br />should make an on -site evaluation of the existing fill if it is to <br />remain in place. Additional fill placed above existing fill should be <br />properly placed and compacted to at least 95% of the maximum Modified <br />Proctor dry density. <br />This technique is suitable only in driveway and parking areas where the <br />undisturbed pre-existing fill is suitable to remain in place. On -site <br />evaluations of this fill would be required at the time of excavation. <br />The geometry of site development may not allow the use of this tech- <br />nique except in limited areas of the drives. The 1 to 1 slope of <br />properly placed and compacted fill extending outward from the base of <br />any footing for the shopping center or retaining wall must be pre- <br />served, which will require over -excavation into the drive areas on the <br />north and east of the building. The extent of this over -excavation may <br />remove a large portion of the existing fill. <br />Once road base elevation has been reached, the subgrade soils should be <br />proof -rolled prior to the placement of any road base aggregate or <br />bituminous roadways, to detect any soft areas. The zones of softened <br />e_ <br />