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10 I 777X Static Test Building <br /> Earthwork <br /> Site Preparation and Grading <br /> We recommend that all site grading, paving, and any utility trenching be conducted during relatively <br /> dry weather conditions. <br /> It may be necessary to relocate or abandon some utilities. Excavation of these utility lines will <br /> probably occur through fill.Abandoned underground utilities should be removed or completely <br /> grouted. Ends of remaining abandoned utility lines should be sealed to prevent piping of soil or water <br /> into the pipe. Soft or loose backfill should be removed,and excavations should be backfilled with <br /> structural fill. Coordination with the utility agency is generally required. <br /> Structural Fill <br /> Backfill placed within the building area or below paved areas should be considered structural fill. We <br /> make the following recommendations for structural fill selection, placement, and compaction. <br /> ■ For imported soil to be used as structural fill, use a clean,well-graded sand or sand and gravel with <br /> less than 5 percent by dry weight passing the No. 200 mesh sieve(based on the minus 3/4-inch <br /> fraction of the material). Compaction of material containing more than approximately 5 percent <br /> fine material may be difficult if the material is wet or becomes wet during rainy weather. <br /> ■ "Free draining"structural fill should consist of well-graded sand or sand and gravel with less than <br /> 3 percent by dry weight passing the No. 200 mesh sieve (based on the minus 3/4-inch fraction of <br /> the material). <br /> ■ Place and compact all structural fill in lifts with a loose thickness no greater than 10 inches. For <br /> hand-operated "jumping jack" compactors, loose lifts should not exceed 6 inches. For small <br /> vibrating plate/sled compactors, loose lifts should not exceed 3 inches. <br /> ■ Compact all structural fill to at least 95 percent of the modified Proctor maximum dry density(as <br /> determined by ASTM International [ASTM] D 1557 test procedure). <br /> ■ Control the moisture content of the fill to within 2 percent of the optimum moisture. Optimum <br /> moisture is the moisture content corresponding to the maximum modified Proctor dry density. <br /> ■ In wet subgrade areas, clean material with a gravel content of at least 30 to 35 percent may be <br /> necessary. Gravel is material coarser than a US No.4 sieve. <br /> ■ Before filling begins, provide samples of the structural and drainage fill for laboratory testing. <br /> Laboratory testing will include a modified Proctor test and grain size distribution for structural fill <br /> and grain size distribution for drainage fill. Field testing with a nuclear density gauge uses the <br /> maximum dry density determined from a modified Proctor test, so it is important to complete the <br /> laboratory testing as soon as possible in order to not delay backfilling. <br /> 19106-01 <br /> May 29,2015 HAWOT(JIY SME <br />