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over excavation and recompaction of th'e building pad difficult. The subgrade could become <br /> very soft and pumping during the over excavation and filling process. Additional excavation <br /> and the use of a geotextile fabric and a foot of aggregate base to bridge or stabilize the <br /> subgrade may be-required and should be allowed for in the contract documents. <br /> If grading is accomplished as!'specified, then the foundations for the proposed <br /> construction can consist of conventional spread footings and slab on grade. Footings should. <br /> be carried to a minimum depth of 12 inches below finished grade. These foundations can <br /> be.loaded to bearing capacities not to exceed 2000 pounds per square foot total load'. <br /> Bearing capacities may be increased 1/3 for temporary seismic and wind loads. Minimum <br /> i <br /> width of footings should be established as 12 inches. - <br /> , 4 <br /> A minimum of 4 inches of clean gravel should be placed beneath the slab on grade. 4 <br /> This gravel should be well graded between a maximum size of 1 inch and a minimum size <br /> of 1/4 inch with zero percent passing the No. 4 sieve: To hinder the passage of moisture <br /> vapor through the slab, an impervious vapor barrier should be provided such as 6 mil (� <br /> p g ( <br /> visqueen or equivalent. One to two inches of sand should be placed over the visqueen to <br /> protect it during construction and to aid in curing the concrete. <br /> - I <br /> It is recommended that our `office be retained to monitor and, test the grading <br /> operations. This is particularly important due to the presence of the old loose fill that exists . <br /> in the building pad area. If our. '!office is not afforded the opportunity to .provide <br /> construction monitoring services the `recommendations of this report should be considered <br /> invalid. <br /> a <br /> Z w <br /> O ~ <br /> 4Ss �G1 <br /> P <br />'t <br /> E <br />