Township Council Meeting — Packet

The length of the trench to be opened or the area of the surface to be disturbed and restored at any time will be limited by the Engineer with regard both to expeditious construction, and convenience to the Owner. New trenches will not be excavated if previous trenches are in need of back-filling or labor is needed to restore the surface of the ground to a safe and proper condition. Trenches for pipes shall be a minimum of 2' wider at the bottom than the outside diameter of the pipe and shall not remain open in excess of 50' in length nor remain open overnight. Excavation for subsurface structure shall also include the excavation required to provide compacted granular bedding as shown in the Construction Details. Whenever the material at the bottom of a bedding or other subsurface structure excavation is soft or otherwise unsuitable, it shall be removed to such depth as the Engineer may require and the space back-filled with Coarse Aggregate Type 57. All excavations for pipelines shall be clear of boulders, rock, masonry, or other similar material which shall be excavated to a level at least six inches below the bottom of the pipe, and carefully refilled with approved material mechanically compacted to provide a stable subbase. Rock or boulders shall be removed from sides of trenches to 12 inches outside the wall of the pipe, unless permission to do otherwise is expressly given. Gravel or stone bedding shall be provided, placed and compacted to the minimum depths when indicated on the plans. The bottom of the trench shall be excavated where the earth is suitable for good foundation to the form and size of the lower portion of the pipe or other structure, so that there shall be full and adequate support for the structure which is to be built on it. Ample excavation shall be made under and around the pipe joints for jointing and to relieve the bell of shearing forces. Excavation, unclassified, shall also include removal of hot mix asphalt pavement overlay, hot mix asphalt pavement, and reinforced and non-reinforced concrete pavement. In addition, excavation, unclassified, shall include the sawcutting of the existing pavement. This shall be at a distance of one foot from the edge of the existing pavement that is to remain in place to form a proper bond between the new pavement and the existing pavement, or as directed by the Engineer. Excavation,

nce of one foot from the edge of the existing pavement that is to remain in place to form a proper bond between the new pavement and the existing pavement, or as directed by the Engineer. Excavation, unclassified, shall also include, as required, the separation and temporary stockpiling of suitable earth materials from excavation and the rehandling of the stockpiled materials for the construction of the roadway embankments, subbase, base courses and backfill if and where directed by the Engineer. Excavation, unclassified, shall also include removal of unsuitable material in cut sections disclosed by proof rolling. Where rock is encountered at the locations of the proposed inlets, manholes, and headwalls, the rock shall be dressed to level beds as directed by the Engineer. If during construction, the contractor encounters buried debris, the contractor will be responsible to remove the same to limits approved by the Township. Disposal of the excavated debris shall be the sole responsibility of the contractor. Unauthorized Excavation Special care will be taken with the final six inches of all excavations. In no case shall the excavation be carried below grade by machine and backfill used to establish the required grade. Where the excavation has been carried below grade through error or because of slides or cave-ins, the contractor shall at his own expense restore such areas with 3/4 inch graded gravel or crushed stone or as directed by the Engineer. If the Contractor excavates below the required grade for structures, the overexcavation shall be filled with material subject to the requirements of the Engineer. The material may include 2000 psi concrete if so ordered by the Engineer. Sheeting and Bracing Where necessary for safety or to prevent disturbance, damage, or settlement of adjacent structures, pipelines, utilities, improvements, or paving, excavations shall be sheeted and braced. 19