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..� , __- <br /> �•'+� W,m ' w, '�'�S Ci� <c <br /> � ��h � ,,�w4 t,yLS'7e�J:. <br /> � F�''�� �'r��` � f;h1t{-.�fir4. ?„ . <br /> �-. ;� �a �,y <br /> ,�- �,�;"�i: <br /> "�' . ` � <br /> �� <br /> � . � ' �14 ix!, <br /> �x:; , .J�' - . <br /> „i�.' <br /> �.�t�l>'t . <br /> � � � ,j � G <br /> p � G <br /> C M <br /> b H N <br /> � <br /> M S <br /> � y � ' LQiIS Corpontion WG-1049-01-067 <br /> .°, y �°�x 3uly 18, ;991 Page 5 <br /> z �� � 6. Coa�oaction <br /> °ano <br /> N =' � All swctural fill should be compacted to at least 95 percent m�cimum densiry as determined by <br /> � y � ASTM Designation D1557-78. Fill material should be spread and compacted in lifu not <br /> H y exceeding 8 inches in uncempacted thickncss. <br /> N <br /> O N a <br /> � ro � 7, Trench Backfill <br /> N <br /> � �' Utiliry trenches can be backiilled with importcd fill placed in lifts �`approximateiy 8 inches m <br /> uncompacted thiekness. However, thicLer lihs can be vsed pc'ovide.�l the method of compac.io:� <br /> is approved by the geotechnical engineer and the required minimum degree of compaction is <br /> , achieved. <br /> If on-site soil is used as trench backfill it should be compacted to at least 90 percent relaGve <br /> , compaction by mechanical means only (no jetting will be allowed). Imported sand can be used <br /> for trench backfill if it is compacted to at leas[95 percent maximum density and sufficient water <br /> is added during backfilling operations to prevent the soil Gom "bull:ing" during compaction. <br /> � <br /> + All erench backfill in slab and pavement areas should also be compacted to at least 95 percent <br /> i'��t maximum densiry. <br /> � ; <br /> � 8. Drainage <br /> I � <br /> 1��� � � Con�truction and long-term (permanent) dr.i;na.ge measures should be incorporated into the <br /> , project. <br /> ��•.• `� 5.1. Conslruction Drainage <br /> � � Groundwater was not encountered during drilling in any of the boreholes. ConsequenUy, it is <br /> our opinion that groundwater will not present significant construction problems. <br /> � ��� , . � <br /> Water should not be allowed to stand in any azea where foundations, slabs, or pavements aze <br /> ' to be constructed. If standing water is encountered during construction, lhese area�can be sloped <br /> I ! <br /> � towuds one or more shallow sump pits. The collected water should ti.en be divert to a <br /> �.�� positive and permanent dischazge. <br /> j ' d <br /> Durin� construcaon, loose subgrade surfaces should be sealed at night and over ueek�nds. This <br /> I I -��'� helps to prevent moiswre seeping into the subgnde soils, wetting them and maY.ing these soils <br /> � difficult to work or compac[.This can be achieved by rolling the exposed surfaces before leaving <br /> the site and by sloping the site to aid drainage towazds the site perimeter. <br /> I� <br /> � <br /> " Y.aldvecr Assor.iatrs <br />