7200 HARDESON RD 2016-01-01 MF Import

�� � � u ~ M � � � w z ��o Mn 4W C" y H w M �� 6 � �, � C� I �� � L�� :"� CNA Architecture Group 12 Apnl 1991 W-7352 Page 11 equivalent weight of 35 pcf. Surcharges due to sloping ground, adjacent footings, vehicles, construction equipment, etc., must be added to these values. Loading dock walls should be designed with a horizontal surcharge equivalent to 40 percent of the dock vertical live loading. The above equivalent (luid pressures assume that the backfill is compacted to 95 percent of the modified Proctor maximum dry density (ASTM:D-1557). Additional compaction near the wall will increase lateral earth pressure while a lesser degree of compaction could permit post-construction settlements. Only light, hand-held vibratory equipment should be used within 3 feet of the wall. 5.6 Drainage Considerations Site grades should be set so that water does not collect adjacent to the buildings. The ground should slope downward away from the structures so that runoff may be carried to a suitable distant discharge. The base of all retaining walls, loading dock walis, and locations where fioor level is at or below adjacent outside grade should be protected from seepage or groundwater by a perforated pipe at the base elevation. The perforated pipe should be totally surrounded by at least 6 inches of pea gravel. This foundation drainage system should be allowed to discharge via tightline downslope by gravity to a s:orm sewer or other suitable outfall. Roof and surface runoff should not discharge into the perforated footing drain system. Instead, a separate tightiine drain system or spiash blocks should be used. In other areas., where excavations are made, seepage zones may develop from cut faces. Such localized seepage areas should be blanketed with rock to control piping and erosion. The contractor should be prepared to divert surface water runoff around exposed ground surfaces. This should include diversion of water runoff from the adjacent property west of the site, which presently drains onto the subject property. Additionaily, if areas of spring activity are encountered during construction in excavations; cuiverts, subdrains, or pump sump installation may be necessary to transport the water past the area being developed.