6400 MERRILL CREEK PKY 2018-01-01 MF Import

� � FLOOR SLAB SUPPORT Satisfactory subgrade suppoR for the building floor slab can be obtainod on the undisturbed jnadve soils or on adequately compacted suuctural fi1L Floor slabs ahould t�e underlain by a 4inch thickness of ccushed rock or gravel containing no more than 3 percent fines to provide a I capillary break. '1]ie capillary break material should be placed in one lift and compacted w a minimum of 95 percent of the IvII)D ac ddermined by AS1'M D-1557. A vapor barrier ahould be instal►ed in any areas where the prevention of moisture migration through the slab is essential. ISeWemeat of floor slabs supporting areal floor loads of I50 to 250 pounds per square foot and consavcted as recommendad is not expected to ezceed 1/2 inc6. 1 LOADING DOCK WALLS I The loading dock walls should be designed for active earth pressures based on an equivalent � fluid density of 35 pcf(pounds per cubic foot). 'ILis value is based on the assumption that (1) the walls wiil not be restrained against rotation when the backtill is placed, (2) the backfill is Ilevel, (3)the backfill oonsists of free�raining, granulaz material, and(4)the backfill is drained. If below-grade walls will be restrained against rotation during backfilling, they should be I designed for an at-rest eazth pressure based on an equivalent fluid density of 55 pcf. A surchazge � pressuce corresponding to one foot of increased wall height shouid be made for each 100 psf of floor load that may be imposed behind the wall. Other surcharge loads ahould be considered as l , appropriate. As stated, the abovc cciteria aze based on the assumption of drained conditions and that the � walls be bad�illed with free-draining granulaz material. We recommend that wapholes be installed at the base of subsurface walis to allow any water which accumulates in the granular backfill to flow onto the pavement and be wllected in the catch basins in each of the uuck 1- loading azeas. � Bacld'ill should he placed and compaMed as recoromended for stn►ctural fill, with the exception of backfill placed immediately adjacent to the walls. Bac�ll adjacent to the walla should be compacted to a lesser standazd to re�uce the potential for developmeat of excess � pressure on the walls. We recommend that fiU placed within a horizontal distance equal W d►e height of the wall be compacted to approzimately 90 percent of the maximum dry density as t determine�by ASTM D-1557 to within 18 inches of bottomof-slab elevation and to 95 percent � of the maximum dry density (ASTM D-1557) above that level. The contractor should avoid overcompaction of the backfill so that damage to the walls does not occur. � LATERAL RESISTANCE � Lateral loads and base shear forces transmitted to the building footings by seismic events or wind may be resisted by passive resistance on the sides of the footings and by friction on the � base of the footings and slab. Passive resistance may be evaluated using an equivalent fluid densiry of 300 pcf (Ewunds per cubic foot) provided that the footings aze surrounded by ( G e o E n Y i n e e r � 1� Fle No.3286-002-itPl I020394