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�J <br /> �`�a � � : <br /> � �g � . ��; ,� ,r .`_ ,�� r�;� � s,d ry. <br /> � ,��, '�ie � r��� � �y'. � �•; <br /> ,�. . . . .. �y.p r: �C f. S , T r ' <br /> ^r y <br /> � ' _ q, T� ���i � ,am;" � <br /> � � ����W� ' '� _ <br /> a�.' , � • . � .. <br />� ' ..-.�+�-r.e. . . a �3,,. , . . .. <br /> C t' ^U <br /> W <br /> i0 �W <br /> � �7 N <br /> r z <br /> K � LOJIS Corporation WG-1049-01-067 <br /> o� � y July 18, 1991 Page 8 <br /> N M <br /> � � �, v A one third increase in the bearing capacity can be used when considering short <br /> o .+ term transient loads. <br />� �g H � � • Minimum depth of perimeter footing, below adjacent finat <br /> E M y exterior grade. = 18inches <br /> � G N � • :viinimum depth of interior footings, below top of floor slab = 12 inches <br /> a �er <br /> � o � , • Minimum width of wall footings = 18 inches <br /> • Minimum lateral dimension of column footings = 24 inches <br /> Pootings located adjacent to other footings or utility trenches should bear below an imaginary <br /> 1.5:1 (horizontal to vertical) plane projected upward from the bottom edge of the adjacent <br /> footings or utiliry trench. <br /> Settlement of spread footing foundations wider thc proposed building loads is anticipaled to be <br /> within tolerable limits for the proposed swcuue. <br /> � �� 2. Slab-on-Gradc <br /> � We recommend that intcrior slaUs-on-grade bc supported on a minimum of two Ceet of <br /> I �'�^�^ eompacted fill or on the dense native soil. Slab reinCorcing should be provided in accordance <br /> �"�� with the anticipated use and loading of the slab. Slab-on-gtade subgrade surfaces should be <br /> proof-rolled to provide a smooth, unyielding sudace for slab support. <br /> I ��� <br /> � If migration of moisture through th.e slab is undesirable, a moismre Uarrier or c�+pillary break I <br /> should be provided bctween the s!ab and subgrade. We recommend it consist of 4 inches of <br /> free-draining gravel covered with an impermeable membrane placed bctween the subgrade soil � <br /> it�' and the slab. The membrane should �e covered with 2 inches of sand for protecdon during <br /> construction. The sand shcruld be ligh;ly moistened just prior to placing the concrete. <br /> i . <br /> � 3. Basemrnt and Retaining 1Valis <br /> !�w f� lf the undc�ground pazking level option is cons:dered, the below-grade portions of the foundation <br /> walls will need to be designed as retaining wa;ls. These walis should be designed for different <br /> '°"1�►� �arth pmssures, based on the support conditions and backfil( conditions of individual walls. <br /> ��' � �'Valls that are backfilled should be �esigned for the active or at-rest earth pressures depending <br /> on the degree of movement allowed. The following paragraphs describe the recommended earth <br /> pressures in greater detail. <br /> . a_;�, <br /> " ! KaldveerAssociafes <br /> t <br />