11611 AIRPORT RD Geotech Report 2018-01-02 MF Import

i �, Geotechnical Gngineering Report Proposed Ahn Warchuuse May I I, 2001 CG l�ile No. I 12l Page 6 should be evaluated if it can be used in a structural fill layer or it should bc removed from the si[e. The resulting subgrade should be compacted to a firm,non-yielding conditlon. Areas obsn ved to pump or weave should be repaired prior to placing hard surfaces. "I'he on-sitt soils are considered highly moisture sensitive, a��d will disturb easily when wet. We expect these soils would be difficult, if not impossible, to compact to struct�ra] fill specifications during wet conditions. To minimize project earthwork costs, we recommend that earthwork be conduc[ed dunng the drier summer months. Earthwork may be attempted during wet weather or the winter; however, additional expenses may be incurred. These additional expenses would include extra excavation and use of imported fill or rock spalls. Dunng wet weather, altemative site preparation methods may also be necessary. These methods may include coinpleting site stnpping with a smooth- bucket tra�!choe and diverting ronstruction traffic around prepared subgrades. Disturbance to the prepared subgrade may be minimized by placing a blanket uf rock spalls orimported sand and grave] in traffic and roadway areas. This can be evaluated at the time of consm:ction. Structural Fi11 General: .411 fill pla:ed beneath buildings, pave:nens o� other setilement sensitive features, should be placed as structural fill. Structural fill, by defir.ition, is placed in accordance wrth prescribed methods and standards, and is monitored by an experienced geo[echnical professional or soils technician. Field moni[onng procedmes would include the performance of a representative number of in-place density tests to tiocument Ihe attainment of the desired degree of relative compaction. Materials: Imported structural fill should consist of a good quality, free-draining granular soil, free of organics a„� other deleterious material, and be weil graded to a maximum size of about 3 inches. Imported, all-weather structural fill should contain no more than 5 percent fines (soil finer than a Standard U.S. No. 200 sieve),based on that fraction passing the U.S. 3/4-inch sieve. Most of the existing fill soils consist of mineral soils with some debns such as asphalt chunks and logs. If it is fcasible to segregate the suitable soils from the organics, it may be used as structural � � a� Cornewstone Geotechnical, Inc.