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w� <br /> � <br /> � <br /> } <br /> .�..- �. <br /> �.. . „ �. <br /> . ; <br /> f <br /> i <br /> ��I� i <br /> � y� � ' <br /> M�� I <br /> � , <br /> ��� � �� <br /> �., ' I <br /> � � <br /> � � <br /> Q �.; � <br /> � ~' JN 91322 � <br /> �°i t�a g Kel vi n and r�atti Barton page 9 ' <br /> �` � October 22, 1991 I <br /> H <br /> � y <br /> Minimum Relative i <br /> H <br /> g�;� �o5ation of Fiil Placement Com�actio� <br /> ii��n � <br /> � eeneath footings ,slabs or 95^ i <br /> �' I <br /> y cA wal kway•; <br /> �oca i <br /> eehind retaining walls 90� � <br /> Beneath pavements 95% for u?per 12 inches ` <br /> of subgrade, 90% 6elow � <br /> that level <br /> Where: Minimum Relative Compaction is the retio, I <br /> expressed in percentages, of the compacted <br /> dry density to the maximum dry density, as I <br /> � determined in accordance with hSTM Test ; <br /> Designation D-1557-78 (Modified Proctor) . <br /> Use of on-Site Soils <br /> ' � If grading activities take place during wex wpather, or <br /> ` C,� , whe� the silty, on-site soiis are wet, site i�reparation <br /> . � � costs may be higher because of delays due to rains and <br /> the potential need to import granular fill . The on-site <br /> soils are generally silty and thus are moisture <br /> „I ``� sensitive. Grading operations will be difficult when the <br /> moisture conteit of t�iese soils exceeds the optimum <br /> moisture conte�rl. <br /> j � T�ie moisture content of the silty, on-site soils must be <br /> I 1� at or nea� the aptimum moisture content as they cannot be <br /> consistei�Liy compacted to the required density when the <br /> moisture content is greater than optimum. The moisture <br /> co�tent of the on-site soils at the time of our <br /> i �.� explorations was generally above the estimated optimum <br /> moisture content. The on-site sand or gravel soils <br /> underlying the topsoil could be used as structural fill <br /> � if grading operations are conducted during dry v:eather, <br /> .�� when drying of the wetter soils by aeration is possible. <br /> j During excessively dry weather it may be nec�ssary to add <br /> water to achieve optimum moisture cont��n± . <br /> ��'"� Moisture sensitive soils may also be susceptible to <br /> excessive softening and "pumping" f�om construction <br /> equipment Lraffic when the moisture con'.:�nt is greater <br /> than the optimum moisture content. <br /> l j M1� _ � . . i , <br /> 1 <br /> eti� h � � <br /> } . � •: ; � <br /> *�":-�.' � � G�OTECH CONSULTAN75 , INC. <br />