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6 Assume fields are all 300 ft2 by 5 feet depth (56 yd3) with the top of the field at 5 feet below <br /> ground surface. Assuming one quarter of all leach fields are excavated for off site <br /> disposal, a total of 112 yd3 will be excavated, 56 yd3 of which will be transported off site. <br /> Transportation and disposal costs mirror contaminated soil costs, above. <br />