Laserfiche WebLink
J <br />1. Do not allow water to accumulate in excavations. Remove water to <br />prevent softening of foundation bottoms, undercutting footings, and <br />soil changes detrimental to stability of subgrades and foundations. <br />Provide and maintain pumps, wellpoints, sumps, suction and <br />discharge lies, and other dewatering system components <br />necessary to convey water away from excavations. <br />2. Convey water removed from excavations and rain water to <br />collecting or run -off areas. Establish and maintain temporary <br />drainage ditches and other diversions outside excavation limits for <br />each structure. Do not use trench excavations as temporary <br />drainage ditches. <br />3. While dewatering for new Construction in the vicinity of existing <br />structures, depletion of the groundwater level underneath these <br />existing structures may cause settlement. To avoid this settlement, <br />the groundwater level under these structures shall be maintained <br />by appropriate methods of construction as approved by the <br />Engineer. <br />G. Material Storage: Stockpile satisfactory excavated materials where <br />directed, until required for backfill or fill. Place, grade, and shape <br />stockpiles for proper drainage. <br />1. Locate and retain soil materials away from edge of excavations. <br />2.. Dispose of excess soil material and waste materials as herein <br />specified. <br />H. Excavation for Structures: Conform to elevations and dimensions shown <br />(undercut all structures 3 feet below subgrade) within a tolerance of plus <br />or minus 0.10 feet, and extending a sufficient distance from footings and <br />foundations (minimum 5 feet) to permit placing and removal of concrete <br />formwork, installation of services, other construction, and for inspection, or <br />as shown on the Drawings. <br />1. In excavating for footings and foundations, take care not to disturb <br />bottom of excavation. Excavated by hand to final grade just before <br />concrete reinforcement is placed. Trim bottoms to required lines <br />and grades to leave solid base to receive concrete. <br />2. Do not excavate to the bearing levels designated on the drawings <br />until surface compaction is completed. <br />1 3.03 BACKFILL AND FILL <br />A. General: Place material in layers to required subgrade elevations, for <br />each area classification listed below. <br />1 07/06 02220 -9 05 -5564 <br />