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Two buried outlet pipes are in place at pond 023 (Mine 3 Bin Pad). These pipes are eighteen to <br /> twenty four inches (18"—24") in diameter, and have a maximum burial depth of four feet (4') at <br /> their outlet. The length of each pipe is estimated to be no more than sixty feet (60'). <br /> A twenty four inch (24") inlet pipe is located immediately above the upper 010 (Warehouse) <br /> pond. This pipe is buried beneath the existing road at a maximum depth of two feet (2'). It is <br /> estimated to be forty five feet (45') in length. j <br /> The three pipe segments will be excavated and removed from the site for disposal. Once the ! <br /> pipes are removed from the ground, the excavations will be backfilled to ground level with the <br /> excavated dirt. The backfill will be compacted every foot using a trackhoe bucket or similar <br /> equipment until refusal. The backfilled trenches will be scarified by ripping the ground surface <br /> to a depth of eighteen inches on twenty inch centers. The scarified surface will be revegetated <br /> in accordance with these specifications (Task 6, Revegetation). <br /> Drainage dips will be constructed immediately adjacent to the backfilled trenches. The exact <br /> location of these features will be staked in the field by the PROJECT MANAGER. These dips <br /> will be trapezoidal in shape, with a minimum width of thirty six inches (36"), and a minimum <br /> depth of fourteen inches (14"). Side slopes will be no steeper than 3 H : 1 V. They will be the <br /> same length as the trenches excavated to accommodate the buried pipe removal. <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 3 on the Bid Schedule. This lump sum bid will cover all costs necessary <br /> and incidental to excavating the pond embankments to the design slope, removal and disposal <br /> of excavated materials, surface scarification, removal of specified buried inlet or outlet pipes, <br /> filling of the inlet and outlet pipe excavations and creation of dips adjacent to the inlet and outlet <br /> pipe excavations. The lump sum price shall include all equipment, machinery and labor <br /> necessary to complete the task as described in this specification. Payment will be made only <br /> for the price bid in Item 3 of the Bid Schedule, and as work is completed and approved by <br /> PROJECT MANAGER. <br /> TASK 4 RIP RAP PLACEMENT <br /> In order to protect the excavated spillways from erosion, durable rock rip rap will be placed <br /> within each one following completion of Tasks 2 and 3. <br /> Durable rock rip rap is defined as angular to semi-rounded rock which gives off a ringing sound <br /> when struck with a hammer. Shale is not an acceptable rip rap material. Individual rocks shall <br /> be between two and eight inches (2"—8") in length as measured across the shortest axis of any <br /> individual rock. <br /> Rip rap may be obtained locally, from within the Project Area. A large volume of suitable <br /> material may be found adjacent to the south bank of Dutch Creek above the Road C crossing, <br /> see Map 3, Pond Reclamation Project Area. Rip rap materials may not be excavated from <br /> within the banks of any stream without prior approval of the U. S. Army Corps of Engineers. <br /> 11 <br />