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a <br />i ' <br /> <br />A construction joint should be provided between that portion of the structure <br />supported on spread footings and that portion supported on piling. <br />Methane is a biproduct of sanitary land fills. This gas is odorless and <br />highly explosive. We suggest that a laver of 4" gravel 1' thick be placed , <br />beneath the floor slab. This layer 'should be separated from the floor slab <br />with a layer of plastic. The gravel layer should be vented to the outside <br />so that the methane gas will not accumulate inside of the building. <br />We would be happy to discuss this report in greater detail with you when <br />specific.plans have been formulated. Additional borings will be required <br />to further define the extent of the area where spread footing foundations <br />may be feasible and also to evaluate piling lengths. <br /> <br />Page 5 - #120-3932 <br />borings were taken deep enough at this time to evaluate piling lengths. <br />Since the swamp deposits may still be consolidating under the weight of <br />the fill, some negative load will be developed on these piles. In the <br />deeper areas, this negative load could amount to on the order of 20 to <br />25 tons. IN addition, the fill may contain miscellaneous debris such as <br />concrete, which could create serious problems in attempting to penetrate <br />with timber piling. Therefore, consideration should be given to a steel <br />pipe pile which could carry heavier loads and which could readily penetrate <br />the miscellaneous debris. Of course, these piles would have to penetrate a <br />greater depth into the supporting strata both because they are usually smaller <br />in diameter and also because the required pile capacity would be higher. <br />1 <br />mow/ 0!. L MA"C P'1. 1? ..?• Y 4 .fir N `