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applicable portions ofthe grading code of local regulatory agencies. All earthwork should be performed under the observation and testing ofa qualilied geotechnical engineer. 7.2 SITE AND FOUNDATION PRFJPARATION All site preparation should be observed by experienced personnel reporting to the project Geotechnical Engineer. Our field monitoring services are an essential continuation ofour prior studies to confirm and correlate the findings and our prior recommendations with the actual subsuri'ace conditions exposed during construction, and to confirm that suitable fill soils are placed and properly compacted. The site fill material is considered undocumented and may not be suitable for suppon of the new footings. We recommend that the upper 3 feet of existing soils be removed and recompacted. If loose, disturbed, or otherwise unsuitable materials are encountered at the bottom of excavation. removal of unsuitable soils will be required until firm soils are encountered. The compacted fill soils should be extended horizontal by about 5 feet of building footprints. Excavations below the final grade level should be properly backfilled using lean concrete or approved fill material compacted to a minimum of 90 percent of the maximum dry density as determined by ASTM Test Method D1557. The backfill and any additional fill should be placed in loose lifts less than 8 inches thick. moisture conditioned to near optimum moisture content. and compacted to 90 percent. Fill materials should be tiee ofconstruction debris, roots, organic matter, rubble, contaminated soils, and any other unsuitable or deleterious material as determined by the Geotechnical Engineer. The on-site soils are suitable for use as compacted fill, provided the soil is free of any deleterious substance. All import fill material should be approved by the Geotechnical Engineer prior to importing to the site for use as compacted fill. Excavation activities should not disturb adjacent structures or undermine any adjacent footings. Existing utilities should be removed and adequately capped at the project boundary line. or salvaged./rerouted as desi gned. 7.3 FILL PLACEMENT AND COMPACTION REQUIREMENTS Material for engineered fill should be select liee of organic material. debris. and other deleterious substances, and should not contain liagments greater than 3 inches in maximum 6-*:Dennis- l -01