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t <br />I!, <br />D. Stability of Excavations: <br />1. Slope sides of excavations to comply with local codes and <br />ordinances having jurisdiction. <br />2. Shore and brace where sloping is not possible because of space <br />restrictions or stability of material excavated. <br />3. Maintain sides and slopes of excavations in safe condition until <br />completion of backfilling. <br />E. Shoring and Bracing: <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 <br />bracing as excavation progresses. <br />F. Dewatering: <br />1. Prevent surface water and subsurface or ground water from <br />flowing into excavations. <br />2. Do not allow water to accumulate in excavations. <br />3. Provide and maintain pumps, well points, sumps, suction and <br />discharge lines, and other dewatering system components <br />necessary to convey water away from excavations. <br />G. Stockpile satisfactory excavated materials where directed, until <br />required for backfill or fill. Place, grade and shape stockpiles for <br />proper drainage. <br />H. Excavation for Trenches: Dig trenches to the uniform width required <br />for particular item to be installed, sufficiently wide to provide ample <br />working room. Provide minimum 6 in. clearance on each side of pipe <br />or conduit. <br />1. Excavate trenches to depth indicated or required for indicated <br />flow lines and invert elevations. <br />2. Where rock is encountered, carry excavation 6 in. below <br />scheduled elevation and backfill with a 6 in. layer of crushed <br />stone or gravel prior to installation of pipe. <br />3. For pipes or conduit 5 in. or less, excavate to indicated depths. <br />Hand excavate bottom cut to accurate elevations and support <br />pipe or conduit on undisturbed soil. <br />4. For pipes or conduit 6 in. or larger, tanks and other work <br />indicated to receive subbase, excavate to subbase depth <br />indicated, or, if not otherwise indicated, to 6 in. below bottom <br />of work to be supported. <br />09/03 02200 -3 03- 4138.A -R <br />