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� 15'S t'j i, --- -- --- -- <br /> ' July 31 , 197II <br /> � Certi ficate tlo. 7�305-301 <br /> Page T�•io <br /> _ -� There are several meChods of accomplishing proof rolling. The following <br /> j is the method. corisidered tfie most suitable for this project. The Dynapac <br /> CA-15 is a self-propelled vibratoi•y compactor capable of applyin9 a <br /> � centrifugal force of 333 pounds per linear inch. This type of unit is <br /> suitable for proof rolling and for compaction of the 'remainder of the <br /> � � building and parF;in9 area to produce the required density. ?t should be <br /> effective in the granular ��aterials that appear at or near the surface <br /> - � aver much of the site. <br /> .� <br /> _. ;� It is recommended that ��ie be given the opportunity to observe the proof <br /> '1 rolling and assist in determining what areas are suiiable and �•ihat <br /> - 7 <br /> " corrective action should be taken in the failed areas, should any develop. <br /> ' i We would assign a geotechnical inspection to this task. <br /> � It will be necessary for you to add a section titled "Proof Rolling" to <br /> your special provisions and also, it �aill be necessary to make provision <br /> for removal wasting and replacing �aith clean, granular material any <br /> � �� unstable soil that develops during the process of proof rolling. In <br /> : -`� � addition to the roller as noted above it should be stated that proof <br /> � , <br /> � rolling shall continue until the required 957 of maximum density has <br /> : � been attained in the pavzment areas and 97% in the building area, without <br /> � loss of stability. <br /> �j� We trust this will provide the information ycu need. If wc can be of <br /> � <br /> any further help in this matter, either now or during contract adminis- <br /> tration, please call upon us. <br /> ` �.,.:.. . . , / <br /> Prepared by: Y.enneth E. Bronson, Senior h1aterials Engineer /,�' � <br /> � . Dr. George R. Knight, P.E. , Chief Engineer �G,�•� <br /> 1 <br /> 5incer�ynurs, <br /> +'� • ���, � , <br /> yl �`1�,6�fit-7 i <br /> � �aeorge E. Nuck 5y, P. E. <br /> President <br /> , �; - . • <br /> GEN:jc <br /> ~ ; cc F1r. Gary Schaefer <br /> TRA - <br /> � _� 215 COlUlnbid , SC�lCk1P� WA 9�1Q��-----------. i�.�ri�ic re':nri, i.+nnnn�nnit��...__.. <br /> i <br /> �� <br />