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bracing, and other work within the cofferdam shall be done in a <br />manner to avoid disturbing any construction of the masonry <br />enclosed. Any movement or bulging which may occur shall be <br />corrected by the Contractor at his own expense so as to provide <br />the necessary clearances and dimensions. <br />' <br />5. Drawings of the cofferdams and design computations shall be <br />submitted to the Engineer for approval, and construction shall not <br />be started until such drawings are approved. However, approval of <br />' <br />these drawings shall not relieve the Contractor of the responsibility <br />for the cofferdam. The drawings and computations shall be <br />prepared and stamped by a Registered Professional Engineer in <br />the State of Florida and shall be in sufficient detail to disclose the <br />method of operation for each of the various stages of construction, <br />if required, for the completion of the substructures. <br />B. Dewatering, Drainage and Floatation: <br />1. The Contractor shall construct and place all concrete work, <br />structural fill, bedding rock, and limerock base course, in- the -dry. <br />In addition, the Contractor shall make the final 24 inches of <br />excavation for this work in- the -dry and not until the water level is a <br />minimum of twelve inches below proposed bottom of excavation. <br />' <br />2. The Contractor shall, at all times during construction, provide and <br />maintain proper equipment and facilities to remove promptly and <br />' <br />dispose of properly all water entering excavations and keep such <br />excavations dry so as to obtain a satisfactory undisturbed subgrade <br />foundation condition until the fill and structure to be built thereon <br />have been completed to such extent that they will not be floated or <br />otherwise damaged by allowing water levels to return to natural <br />elevations. <br />3. Dewatering shall at all times be conducted in such a manner as to <br />preserve the natural undisturbed bearing capacity of the subgrade <br />bottom <br />soils at proposed of excavation. <br />4. Wellpoints may be required for predrainage of the soils prior to final <br />excavation for some of the deeper in- ground structures, and for <br />maintaining the lowered groundwater level until construction has <br />' been completed to such an extent that the structure or fill will not <br />be floated or otherwise damaged. Wellpoints shall be surrounded <br />by suitable filter sand and no fines shall be removed by pumping. <br />' Pumping from wellpoints shall be continuous and standby pumps <br />shall be provided. <br />t <br />1 07/06 02220 -3 05 -5564 <br />