4027 4TH ST SE 2018-01-01 MF Import

January 14, 2003 HWA Proiect No.2002-146-21 Roadway Slls should be placed in relatively horizontal lifts and compacted to a dense and firm condidon. The thickness of loose lifts should not exceed 8 inches for heavy equipment compactors and 4 inches for hand operated compactors. The procedure to achieve the specified minimum relative compaction depends on the size and type of compacting equipment, the numba of passes, thickness of the layer being compacted, anri certain soil properties. We recommend that the appropriate lift thickness, it;e adequacy of the subgrade preparallon, the re-use of stockpi'.ed material, and fill compaction be evaluated by a representative of the geotechnical consultant during conswction. A sufficient number ef in-place density tests should be performed as tiie fill is being placed to determine if U;e required compaction is being achieved. 4.5.3 Wet Weathcr Earthwork The on-site fill soils and the stockpile material aze considered moderately moisture sensitive and nmay be difficult to traverse with construction equipment during periods of wet weather or wet conditions. Furthermore, these soils may be difficult to compact if their moisture co^tent significandy exceeds the optimum. Based on the Compaction Test results for the on-site stockpile, the in-situ moisture content is well below optimum and will be suitable for re-use as general fill provided the soil is protected from extraneous water dwing handling. We understand construction is planned for between Janua;� and June, with a dedicated plan to protect the integriry of the stock-piled material, we believe the material can be re-used. General recommendations relative to earthwork performed in wet weather or in wet conditions are presented below. • Eartliwork should be perfocmed in small azeas to minimize exposure to wet weatner. Excavation or the removal of unsuitable so�l should be followed prr,mptly by the placement and compaction of clean fill. The size and type of construction =yuipment used may have to be limited to prevent soil disturbancc. Under some circumstances, it may be nec;essary to excavate soils wir!-, a backhoe to minimize subgrade disturbance caused by equipment traffic. Material used as fiil during wet �veather conditions should consist of clean, granular soil with less than 5 percent passing the U.S. 5tandazd No. 200 sieve, based on wet sieving the fraction passing the '/.-inch sieve. The fine-grained portion of the roadwa}• fill soils should be non-plastic. • The ground surface within the construction area should be graded to promote run-offof surface water and to prevent the ponding of water. :0021afrcport-Gnal � �j HWAGEOSCIENCESINC. IW