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FML, Inc. STS Project 93589 ' August 28, 1985 -12- .: It is possible that some of the existing fill would be suitable for reuse if laced in a controlled manner and properly compacted. We P P P Y P recommend that soil suitable for reuse as structural fill be segre- gated at the time of excavation from any organic or unsuitable soils which may be encountered. It is possible that this excavation in the fill area would encounter small amounts of perched ground water seepage. We recommend that any seepage or rainwater accumulation at the 1 excavation base be promptly removed, and any loosened or sof+ened soils should be removed and replaced with properlyplaced and compacted fill material. In backfilling this excavation, structural fill should be non - organic and free of debris. Soils used for structural fill should .I be placed in loose lifts of approximately 9 inches in thickness and be compacted to at least 95 percent of the maximum Modified Proctor -` dry density. The zone of compacted fill should extend outward from the edge the -� footings 1 ft horizontally for each foot in depth below the pro- posed foundation base elevation. j 2. Foundations i Foundations based on properly placed and compacted fill over a suitable subg rode can be proportioned for a maximum net allowable soil bearing pressure of 3,000-pounds per square 'foot. The founda- tion design and construction in fill areas could be similar to foundations based on the naturally -occurring soils of this site. The constraints with regard to foundation design and construction in natural soil areas would also apply to foundations based on structural fill.