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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />SECTION 02223 <br /> <br />EXCAVATION BELOW NORMAL GRADE AND GRAVEL REFILL <br /> <br />PART 1 - GENERAL <br /> <br />1.01 SCOPE OF WORK <br /> <br />A. If in the opinion of the Engineer, the material at or below the normal grade of the <br />bottom of the trench (0.7 feet below the invert of the pipe) is unsuitable for <br />foundation, it shall be removed to the depth directed by the Engineer and replaced <br />by drain rock, as specified in Section 02221 - Trenching, Bedding, and Backfill for <br />Pipe. <br /> <br />B. It shall be the Contractor's responsibility to provide trench safety systems such as <br />sheeting and bracing in accordance with state and local regulations. <br /> <br />1.02 RELATED WORK <br /> <br />A. Section 02221: Trenching, Bedding and Backfill for Pipe. <br /> <br />PART 2 - PRODUCTS <br /> <br />2.01 MATERIALS <br /> <br />A. Drain rock shall be 3/4 inch washed and graded limerock. The rock shall be graded <br />so that 99% will pass a 3/4 inch screen and 80% will be retained on a No. 8 <br />screen. Material meeting the Florida Department of Transportation Standard <br />Specifications for No. 57 stone shall be acceptable. <br /> <br />PART 3 - EXECUTION <br /> <br />3.01 EXCAVATION AND DRAINAGE <br /> <br />A. Whatever the nature of unstable material encountered or the groundwater <br />conditions, trench drainage shall be complete and effective. <br /> <br />B. If the Contractor excavates below grade through error or for his own convenience, <br />or through failure to properly dewater the trench, or disturbs the sub-grade before <br />dewatering is sufficiently complete, he may be directed by the Engineer to <br />excavate below grade as set forth in the preceding paragraph, in which case the <br />work of excavating below grade and finishing and placing the refill shall be <br />performed at his own expense. <br /> <br />06/07 <br /> <br />02223-1 <br /> <br />03-4197 <br />