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f .._ <br /> � <br /> Y.�T� <br /> .�....�.:. ' `. �. <br /> R <br /> �' L <br /> � �[ <br /> I <br /> � <br /> � <br /> -���� a�� ' <br /> � � � � 1. <br /> ��� � <br /> ��� - �� <br /> H�� <br /> ! �"� <br /> i�� ' <br /> ����y' Geo�Engineers <br /> Q• C! � IW Depending on the finished grade of the structure, thr base of the <br /> �rl � � <br /> y footings could be at or �ossibly helow the deepest level of our explor- <br /> H "' ations at the southeast corner of the building. We recommend that all � , <br /> �jb�y ; � t footing excavations Ue observed by a representative from our firm , . ' <br /> ° i <br /> .�C <br /> t��" � immediately prior lo mud mat or steel and concrete placement to con irm ( i <br /> �y li that tlte bearing surface has been prepared in a manner consistent witli our � <br /> recommendations, and that the subsurface conditions are as expected. - <br /> � <br /> i� <br /> "� SL4B-ON-CRADE SOPPORT �. � <br /> ' ,_o The subgrade soi.l at floor grade in the southern portion oF the <br /> i I <br /> �# building should be dense gl.acial till. A transition from the dense till <br /> . to the medium dense weathered till and then to structural fill will occur , . . � <br /> r,� <br /> - � within the building footprint. It may be necessary to conpact the <br /> w <br /> subgrade in the areas of cut if there has been disturbance from the <br /> ` a excavation and grading activities. In areas where the subgrade coneis[s <br /> �- �� of weathered till, the surface should be prepared in accordance with the <br /> .��� � <br /> V t� recommendations discussed in Site Preparation and Eartliwork. All fill �; <br /> � placed for subgrade in floor areas should Ue compacCed to 95 percent of <br /> � , <br /> �� . �.� MDD. �. <br /> ; �I �� �,j Ide recommend tha[ a 4-inch-thick Uase course consisting of clean sand i <br /> � and gravel or crushed rock Ue placed Co form a capillary Ureak. The sand � <br /> i � 1 <br /> � and gravel should liave a maximum particle size of 3/4 inch and contain <br /> . I _� i <br /> less than 5 percent by weight passing a No. 200 sieve. We recommend that <br /> � iM <br /> � a vapor barrier be placed between the Lloor slab and tlie Uase course. The ! <br /> i , � I <br /> i `w vapor barrier should consist of polyeChylene sheeting with bonded seams. � <br /> � ! ! In order to maintain Che inte�rity of the vapor barrier, it should be ! <br /> V. placed on a leveling course of sand (if Che underlying base course <br /> � �� i � consists ot crushed rockl and be covered with a layer of sand Co protect <br /> � i <br /> d a�ainst damage. i <br /> �1=1 I { LATI'�2AL It3:SISTANCF. � <br /> �d Lateral loads on retaining walls and building fooCings may be <br /> � � resisted by passive resisCance on the sides of the fooCings and by fric- <br /> � tion on the base of the footings and slab. Passive resisCance may Ue <br /> evaluaLed using an equivalenC fluid densiCy of 400 pomids per cuUic foot . <br /> � 10 I <br /> � � <br /> r <br /> .. —�- "�:."i�3� <br /> �w � �� . . . � � I <br /> I <br />