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The center-to-center pile spacing should be not less than <br />three times the largest diameter of the piles. The elevation of <br />each pile top should be determined immediately after It is <br />driven, and after all piles are driven. Where heave of more than <br />1/4** is measured, the pile should be re-driven to its original <br />elevation or lower. <br />There is a distinct tendency for the ground directly <br />adjacent to a building on piles to settle with respect to the <br />structure. This can adversely affect sidewalks, patio slabs, etc. <br />The grading plan for the structure, driveway and landscaped areas <br />should conform with closely as possible to the existing grades, <br />to minimize new fill loadings on the compressible subsoil, and <br />reduce this tendency. <br />Alternative 2 - Rigid Raft Foundation <br />This alternative would be less costly than driven piles, and <br />could be carried out almost at any time, subject only to non- <br />freezing weather conditions.