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030 <br />Mr. John A. Crumpton <br />April 23, 2008 <br />Page 3 of l l <br />spillway system, as well as adjacent areas considered pertinent to the <br />detail design and construction of the proposed improvements. <br />Downstream surveys will include the existing spillway pad, energy <br />dissipater and downstream channel. A minimum of 6 cross sections will <br />be obtained including the downstream road crossing (Pumping Station <br />Road). Cross sections will be extended to sufficient elevation to perform <br />the breach routing analysis to define the Design Storm in accordance to <br />Dam Safety regulations. In addition to the above elevations and location <br />of the existing parking lot, building, mechanical units, and finished floor <br />elevations will also be obtained as additional data to support decisions <br />for the Design Storm Analysis. Where applicable, utility line crossings <br />will be surveyed as well as the blow off line and other associated site <br />utilities. <br />3. Geotechnical Services <br />MCF will contract with Geotechnologies Inc. to provide the required <br />geotechnical services as defined by the requirements outlined in NCAC <br />Title 15A, Subchapter 2K-Dam Safety. The geotechnical service will <br />® include an exploratory phase and therefore assumes two mobilizations to <br />evaluate subsurface conditions. The first mobilization will be to evaluate <br />the condition of the existing slope protection (including subsurface <br />conditions), toe drains, and to define the subsurface conditions where the <br />new spillway system will be located for preliminary design. The second <br />mobilization will be to specifically define subsurface conditions for <br />bearing capacity for the new structures and includes a limited amount of <br />rock coring in the area of the new spillway system. A more detailed <br />outline of the scope of services for Geotechnical Services follows: <br />Existing Data Review- There is a limited amount of information <br />about the dam in the Dam Safety files. Much of the information <br />relates to concrete conditions needing repairs- We propose to <br />thoroughly review the existing files and to use the available <br />information as much as possible. <br />Initial Site Inspection- A site inspection will be conducted by the <br />geotechnical engineer and MCF. Engineer to evaluate the general <br />condition of the main dam structure, determine existing surface <br />conditions of the slope protection and to evaluate depth to soils <br />and soil type beneath the existing principal spillway section. <br />Field explorations (soundings and cores as necessary) will be <br /> <br />