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M98168GE • • material. For this reason we suggest that if formational material is encountered only in portions of the foundation excavations at footing depth the foundation in all areas should be extended to support all foundation members on the formational material. The bottom of the foundation excavations in the formational material should be thoroughly cleaned and observed when excavated. Any loose or disturbed material exposed in the foundation excavation should be removed prior to placing foundation concrete. Loose or disturbed material in the bottom of the foundation excavation which are intended to support structural members will likely result in large and unpredictable amounts of settlement, if the loose or disturbed material is not removed. The bottom of any footings exposed to freezing temperatures should be placed below the maximum depth of frost penetration for the area. Refer to the local building code for details. All footings should be appropriately proportioned to reduce the poet construction differential settlement. Footings for large localized loads ahoul3 be designed for bearing pressures and footing dimensions in the range of adjacent footings to reduce the potential for differential settlement. We are available to discuss this with you. Foundation walls may be reinforced for geotechnical engineering purposes. We suggest at least t•.~o (2) number 5 bars, continuous at the top and the bottom (4 bars total), at maximum vertical spacing. This will help provide the walls with additional beam strength and help reduce the effects of slight differential settlement. The walls may need additional reinforcing steel for structural purpos- es. The structural engineer should be consulted for foundation design. The structural engineering reinforcing design tailored for this project will be more appropriate than the suggestions presented above. The structures and ancillary equipment may be founded on spread footings which are placed entirely on the natural undisturbed siltstone formational material. The bearing capacity will depend on the minimum depth of embedm- ent of the bottom of the footings below the lowest adjacent grade and the support characteristics of the soils supporting the founda- tion. Other characteristics may influence embedment. The embed- ment concept is shown on Figure 6. The footings may be designed using a formational material bearing capacity of 7,000 pounds per 11 lambert ana ~~~ociateo GOM/YLTIMO O[OTlfMM1L/L lMOIM/[q •MO Yti/III~L TF/TIMO