2522 RUCKER AVE 2018-01-01 MF Import

I Geotxhnical Engineering Report ' Gardener Group Condominiums July 16, 1997 � NCAFileNo.209297 Page 7 blanket of clean pit-tun or gravel material to protect the underlying subgrade from softening during wet conditions. The thick�ss of the pit-run or gravel should be determined based o� the time of yeer, � current weather conditions and the expected traffic conditions. Earthwork would be best perfo�med during periods of dry weather. Structural Fill Geeenl: All fill placed beneath buildings, pavements ar other settlement sensitive features, should be placed as structural fill. Structural fill, by definition, is placed in accordance with prescribecl methods and standards, and is monitored by an experienced geotechnical professional or soils tcehnician. Field monitoring procedures would include the pedormance of a representative number of in-place density tests to document the attainment of the desired degree of relative compaction. The area to receive the fill lshould be prepared as outlined in the Site Preparation wnd Grading sub-section above. ( Materials: Imported structural fill should consist of a goud quality free-draining granular soil, free of i organics and other deleterious material, and be well graded to a maximum size of about 3 inches. IImported, all weather fill should contain no more than about 5 percent fines (soil finer then a U.S. No. 20Q sieve),based on that fraction passing the U.S.No.4 sieve. I 'I'he existing fill soils are fine grained end organic particles and are highly moisture sensitive. Use of � these soils as fill is not recommended. Use of the till as fill should be limited to extended periods of dry weather. Even during periods of dry weather, some discing for drying and/or watering may be necessary to achieve the desired moisture content. We recommend that these soils be considered for fill only if ( construction takes place during the drier summer months. Stockpiles of on-site soils to be used as backfill should be covered with plastic sheeting to help conhol their moisture content. � Fill Placement: Following subgrade preparation, placement of the strucmral fill may proceed. All backfilling should be accomplished in 8- to 10- inch thick unifortn lifts. Each lift should be spread � evenly and be thoroughly compacted prior to placement of subsequent IiRs. All structural fill underlying building areas, and within 2 feet of pavement subgrade, should be compacted to a minimum of 95 percent of its maximum dry density. Maximum dry densiry in this report refers to that density as � determined by the ASTM D 1557 compaction test procedure. Fills more than 2 feet beneath pavement subgrades should be compacted to above 90 percent of their maximum dry density. The moisture a�ntent of the soils to be compacted should be within about 2 percent of optimum so that a readily compacteble Icondition exists. lt may be necessary to overexcavate and remove wet soils in cases where drying to a I NE4SON-COUVRETTE &ASSOGATES, INC.