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During completion of Task 2, the corrugated metal pipe (CMP) dewatering device at each pond <br /> will be excavated from the individual pond embankments, and will then be removed from the <br /> Project Area. <br /> As indicated in the attached Table, the CMP dewatering devices vary in diameter from twelve to <br /> thirty six inches (12" to 36"). The length and depth of burial are also variable from pond to pond. <br /> Each CMP dewatering device shall be excavated and removed from its pond embankment. <br /> Prior to starting excavation, temporary sediment control, preferably silt fence, will be installed <br /> immediately above the waterline of the pond for the width of the excavation. The <br /> CONTRACTOR shall exercise sufficient care, so that excavated earthen materials are not <br /> introduced into the pond. <br /> The dewatering devices shall be extracted in such a manner so that the ground elevation at the <br /> base of the CMP for its length through the pond embankment is maintained. Upon completion <br /> of the excavation the grade, or fall, of the base of the excavation must mirror the grade or fall of <br /> the CMP prior to its removal. Upon completion of excavation, inlet and outlet elevations must <br /> be identical to those of the CMP prior to its removal (see Figure 2, Relative Cut Elevations). <br /> High points within the excavation will not be permitted. <br /> It should be anticipated that each dewatering device has at least one metallic cut-off collar <br /> attached to it near the mid-point of the embankment. In some instances, there may be more <br /> than one cut-off collar, and in some instances, such as at the 021 ponds (Sutey Refuse Area), <br /> the cut-off collar(s) may be made of concrete. In all cases, the cut-off collars shall be removed <br /> from the embankment during CMP excavation. If excavation of the cut-off collar results in <br /> creation of a depression in the base of the CMP excavation, the depressions shall be filled with <br /> excavated earthen materials. The earthen fill materials shall be thoroughly compacted in place <br /> using the bucket of a trackhoe or backhoe. <br /> Once excavated and removed from the embankment, the CMP, cut-off collars and any <br /> incidental metallic or concrete materials shall be removed from the Project Area and will be <br /> proper y isposed of. Disposal may occur at an appropriately licensed land fill, or the <br /> CONTRACTOR may salvage the materials. CMP and incidental materials may be temporarily <br /> stored at a location within the Project Area which shall be mutually agreed upon by the <br /> CONTRACTOR and PROJECT MANAGER prior to stockpiling these materials. <br /> Disposal of excavated earthen materials is discussed in Task 3, Earth Work. <br /> Measurement and Payment <br /> There will be no measurement for payment. Payment for this task will be reflected in a lump <br /> sum bid under Item 2 on the Bid Schedule. This lump sum bid will cover all costs necessary <br /> and incidental to removing each corrugated metal pipe dewatering device and incidental <br /> structures at each of the ponds subject to this Project. The lump sum price shall include all <br /> equipment, machinery and labor necessary to complete the Task as described in this <br /> specification. Payment will be made only for the price bid in Item 2 of the Bid Schedule, and as <br /> work is completed and approved by the PROJECT MANAGER. <br /> 9 <br />