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Soil disturbed or weakened by the Contractor's operations and soils permitted to soften from <br /> exposure to weather shall be excavated to firm foundation and refilled with engineered fill <br /> material compacted to 95 percent of ASTM D1557, maximum density. All work of this nature will <br /> be at the Contractor's expense. <br /> B. Trench Excavation <br /> Trench sides shall be constructed as nearly vertical as practicable. Sides of trenches shall not <br /> be sloped between the bottom of the trench and the elevation of the top of the pipe. Bottom of _ <br /> trenches shall be graded accurately to provide uniform bearing and support for each section of <br /> pipe or conduits on undisturbed soil, or bedding material as indicated or specified at every point <br /> along its entire length except for portions where it is necessary to excavate for bell holes and for _ <br /> making proper joints. Bell holes and depressions for joints shall be dug after trench has been <br /> graded. Dimension of bell holes shall be as required for properly making the particular type of <br /> joint to ensure that the bell does not bear on the bottom of the excavation. Trench dimensions <br /> shall be as indicated. <br /> C. Structural Excavation _ <br /> The bottom excavation elevation shall be sufficient to allow the proper placing of forms and <br /> concrete construction to undisturbed weathered material to the elevations indicated, or as <br /> specified herein. Unless otherwise specified, excavations shall extend a sufficient distance from _ <br /> walls and footings to allow for placing and removal of forms, installation of services, and for <br /> inspection, except where concrete is specified to be placed directly against excavated surfaces. <br /> Immediately following excavation and moisture conditioning, the subgrades beneath all <br /> structures shall receive a layer of geotextile fabric and be backfilled with a minimum 12" layer, <br /> after compaction, of Class 2 aggregate base. <br /> D. Foundation Inspection <br /> Whenever any structure excavation is substantially completed to grade, the Contractor shall — <br /> notify the Engineer who will make an inspection of the foundation for uniformity and suitability as <br /> a structure foundation. No gravel, rock, sand, concrete or masonry shall be placed until the <br /> foundation has been inspected by the Engineer. The Contractor shall, if directed by the _ <br /> Engineer, dig test pits and make test borings and foundation bearing tests. If the material tested <br /> complies with the specifications, the cost thereof will be paid for as extra work. If the material <br /> tested does not comply with the specifications, the cost thereof (initial testing, remedial work, re- _ <br /> testing)will be borne by the Contractor. <br /> 3.03 SUBGRADE PREPARATION -- <br /> Ground surfaces receiving engineered fill shall be prepared by clearing and grubbing as specified <br /> in Section 02160 Site Preparation, and by removing soil which is high in organic content and other _ <br /> deleterious material. Subgrade shall then be scarified to a depth of 12 inches, moisture <br /> conditioned and recompacted as specified for fill. <br /> 2007 Division III-59 NEI Phase II Water and Sewer <br /> July CIP Nos.7468, 7589, 7590 <br />