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02324 Trenching <br /> C. Do not advance open trench more than 200 feet ahead of installed pipe. <br /> D. Cut trenches to width indicated on Drawings, or as required by utility provider. Remove <br /> water or materials that interfere with Work. <br /> E. Excavate bottom of trenches per pipe manufacturer's recommendations with a width <br /> maximum 2 feet wider than outside diameter of pipe. <br /> F. Excavate trenches to depth indicated on Drawings. Provide uniform and continuous <br /> bearing and support for bedding material and utilities. <br /> G. Do not interfere with 45 degree bearing splay of foundations. <br /> H. When subsurface materials at bottom of trench are loose or soft, excavate to greater depth <br /> as directed by the project Geotechnical Engineer until suitable material is encountered. <br /> Notify Engineer, and request instructions. <br /> I. Cut out soft areas of subgrade not capable of compaction in place. Backfill with sand or <br /> approved native materials and compact to density equal to or greater than requirements <br /> for subsequent backfill material. <br /> J. Trim excavation. Hand trim for bell and spigot pipe joints. Remove loose matter. <br /> K. Correct areas over excavated areas with compacted backfill as specified for authorized <br /> excavation or replace with fill concrete as directed by Engineer. <br /> L. Remove excess subsoil not intended for reuse, from site. <br /> M. Avoid tree roots. <br /> 3.04 SHEETING AND SHORING <br /> A. Sheet, shore, and brace excavations to prevent danger to persons, structures and adjacent <br /> properties and to prevent caving, erosion, and loss of surrounding subsoil. <br /> B. Support trenches more than 5 feet deep excavated through unstable, loose, or soft <br /> material. Provide sheeting, shoring, bracing, or other protection to maintain stability of <br /> excavation. <br /> C. Design sheeting and shoring to be removed at completion of excavation work. <br /> D. Repair damage caused by failure of the sheeting, shoring, or bracing and for settlement of <br /> filled excavations or adjacent soil. <br /> E. Repair damage to new and existing Work from settlement, water or earth pressure or <br /> other causes resulting from inadequate sheeting, shoring, or bracing. <br /> 3.05 BACKFILLING <br /> A. Backfill trenches to contours and elevations with approved fill materials. <br /> B. Systematically backfill to allow maximum time for natural settlement. Do not backfill <br /> over porous, wet, frozen, or spongy subgrade surfaces. <br /> C. Place material in continuous layers as follows: <br /> 1. Subsoil Fill: Maximum 8 inches loose depth. <br /> 2. Structural Fill: Maximum 8 inches loose depth. <br /> 3. Granular Fill: Maximum 8 inches loose depth. <br /> D. Maintain optimum moisture content of fill materials to attain required compaction <br /> density. <br /> E. Do not leave more than 50 feet of trench open at end of working day. <br /> F. Protect open trench to prevent danger to the Owner and the public. <br /> Micke Grove Zoo Wash Water and Septic Disposal System 02324-3 <br /> Siegfried Engineering, Inc. <br /> MESA Project LOCA 0701 <br />