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Walter Holzer <br /> August 22, 1997 <br /> Page Two <br /> 4. The slab is constructed on 20"of pit run clean gravel. <br /> 5. The excavation area is oversized 6 feet on all sides on the clay subgrade. The clay surface is <br /> pitched to the edges. <br /> 6. The concrete delivery ticket indicates the concrete was furnished by Cemstone Products <br /> Company with a specified strength of 4000 psi at 28 days with 6%air entrainment. <br /> ENGINEERING ANALYSIS <br /> 7. The foundation under construction meets the requirements for a group M occupancy structure <br /> using thickened slab construction. <br /> 8. The system is structurally adequate to support the design loads as required by the Code. <br /> 9. A thickened slab foundation system does not go down to frost, therefore movements as much as <br /> 3"to 4"can be expected at times during winter months for this type of construction. <br /> 10. The thick gravel bed will help minimize the amount of movement. Drainage of this gravel fill is <br /> very important. It is strongly recommended that a draintile system be installed daylighting away <br /> from the structure. This will ensure that the gravel fill is kept as dry as possible. <br /> 11. A minimum amount of steel is being installed in the thickened slab portion and in the slab. It is <br /> recommended that the slab be saw cut into relatively square units, in this case six units would be <br /> appropriate. Anticipated loads are light. <br /> GENERAL <br /> 12. This slab foundation system is consistent and meets the requirements for Group M thickened slab <br /> foundation systems in the Code. <br /> If you have any questions,please contact me. <br /> Sincerely, <br /> J. ME GINEERING,INC. <br /> John . DahlmeWer, . <br /> JHD <br /> I hereby certify that this plan, specification or report was <br /> prepared by me or under my direct supervision and that I am a <br /> duly registered professional engineer under the laws of the State <br /> of ota. <br /> Mi sota Registration No.9212 <br />