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' a. Under footings and foundation bases, fill unauthorized <br />excavation by extending the indicated bottom elevation of <br />1 the footing or base to the excavation bottom, without altering <br />required top elevation. Lean (unreinforced) concrete fill may <br />be used to bring bottom elevations to proper position, when <br />acceptable to Engineer. Reinforcement shall be placed as <br />needed or directed by the Engineer. <br />' b. Elsewhere, backfill and compact unauthorized excavations <br />as specified for authorized excavations of same <br />classifications, unless otherwise directed by Engineer. <br />C. Additional Excavation: When excavation has reached required subgrade <br />elevations, notify the Engineer who will reserve the right to contact a <br />specialized geotechnical consultant and make an inspection of conditions. <br />1. If unsuitable bearing materials are encountered at the required <br />subgrade elevations, carry excavations deeper and replace the <br />excavated material as directed by the Engineer. <br />' <br />2. Removal of unsuitable material and its replacement as directed <br />beyond the authorized limits will be paid on the basis of contract <br />conditions relative to changes in work. <br />D. Stability of Excavations: Slope sides of excavations to comply with local <br />codes and ordinances having jurisdiction or as shown on the Drawings. <br />Shore and brace where sloping is not possible because of space <br />restrictions or stability of material excavated. <br />1. Maintain sides and slopes of excavations in a safe condition until <br />completion of backfilling. <br />E. Shoring and Bracing: Provide materials for shoring and bracing, such as <br />sheet piling, uprights, stringers and cross - braces, in good serviceable <br />' <br />condition. <br />1. Establish requirements for trench shoring and bracing to comply <br />with local codes and authorities having jurisdiction. <br />2. Maintain shoring and bracing in excavations regardless of time <br />period excavations will be open. Carry down shoring and bracing <br />as excavation progresses. <br />F. Dewatering: Prevent surface water and subsurface or ground water from <br />flowing into excavations and from flooding project site and surrounding <br />area. Maintain groundwater table level a minimum of one -foot below <br />' excavation level. <br />' 07/06 02220 -8 05 -5564 <br />