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, <br /> : 15'l�`l�, _.__ - --- <br /> July 31 , 1973 <br /> , Cartificate Ilo. 7II05-301 ���`���� <br /> 1 Pa9e Two <br /> - -� There are several meChods of ac,complishing prodf rolling. 7he following <br /> S is thc� method. corisidered tlie most suitable for this project. The Dynapac <br /> _ .� CA-15 is a self-propelled vibratory compactor capable of appiying a <br /> centrifugal force of 333 pounds per linear inch. This type of unit is <br /> suitat�le for proof rolling and for compaction of the 1-ernainder of the <br /> � building and parking area to produce the required density. It should be <br /> effective in the granular niaterials that appear at or near the surface <br /> � over much of the site. <br /> .� <br /> -� �j It is recommended that ��re be given the opportunity to observe the proof <br /> �� rollin� and assist in determiring o-�hat areas are suitable and aihat <br /> _ -� correc�ive action should be taken in the failed areas , should any develop. <br /> �_ � We would assian a geotechnical inspection to this task. <br /> � It will be necessary f�r you to add a section titled "Pro�f Rolling" to <br /> your special provisio�is and also, it will be necessary to make provision <br /> : i <br /> for removal wasting and replacing with clean, granular material any <br /> unstable soit that develops during ihe process of proof rolling. In <br /> { `� addition to the roller as noted above it should be stated that proof <br /> ' rolling shall continue until the required 95p of maximum density lias <br /> � � been attained in the pavement areas anJ 97% in the building area , withcut <br /> � loss of stability. <br /> ~f� We trust this wi11 provide the information you need. If we can be of <br /> any further help in this matter, either now or during contract adminis- <br /> r tration, please call upon us. <br /> '�...:.. . . <br /> Prepared by: I;enneth E. dronson, Senior Materials Engineer ���/ <br /> ""'�� Dr. George R. Y.night, P.E. , Chief Engineer �j��, <br /> , j <br /> Sincere y yours , " <br /> Y � ��i� <br /> . ��� <br /> i George E. Huck y, p, E, � <br /> � President <br /> GEH:jc <br /> � i cc Pir. Gary SchaeFer <br /> TRA - <br /> � _� 215 Colun�bia , Se,�ttle, tJl1 9R10� <br /> , —._----- - - - - - - . .. ._ _ .._ .- --------------rnriric TE'tiNa inn�nninmr:.__:� <br /> �-... <br />