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M03107GE 6.0 FOUNDATION RECOMMENDATIONS Geotechnical engineering considerations which influence the foundation design and construction recommendations presented below are discussed in Appendix C. we have analyzed spread footings and mat foundations as potential foundation systems for the proposed structure. These are discussed below. Due to the number of possible foundation types available and design and construction techniques there may be design alterna- tives which we have not presented in this report. We are available to discuss other foundation types. We recommend that the entire structure be supported on only one foundation type. Combining foundation types will result in differ- ential and unpredictable foundation performance between the varying foundation types. • All of the design parameters presented below are based on tech- niques performed by an experienced competent contractor, high quality craftsmanship, care during construction and post construc- tion cognizance of the potential soil volume change hazard, with appropriate post construction maintenance. The spread footing recommendations include recommended design and construction tech- niques to reduce the influence of volume changes of soil materials supporting the foundation but should not be interpreted as solu- • tions for completely mitigating the potential for movement from volume changes of soil material supporting footings. Exterior column supports should be supported by foundations incorporated into the foundation system of the structure not supported on flatwork. Column supports placed on exterior concrete flatwork may move if the support soils below the concrete slab on grade become wetted and swell or freeze and raise or settle. Differential movement of the exterior columns may cause stress to accumulate in the supported structure and translate into other portions of the structure. 6.1 Spread Footings and Mat Foundations In our analysis it was necessary to assume that the material encountered in the test borings extended throughout the building site and to a depth below the maximum depth of the influence of the foundations. We should be contacted to observe the soils exposed in the foundation excavations prior to placement of foundations to verify the assumptions made during our analysis. The bottom of the foundation excavations should be thoroughly cleaned and observed when excavated. Any loose or disturbed 8 • Lambert ana ~~',sociates L ONSUI TING GEO TELN NICAI ENGINEERS ANO M AiE RIAI TESTING