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EEC Project No. 1082030 <br />Turnpike Reservoir <br />April 22, 2009 <br />Page 2 <br />Earth Engineering Consultants, Inc. <br />approximately 8 to 12-feet in width, depending on the type of machinery used and adequately <br />sloped while excavating to the required level. It was recommended the trench be backfilled with <br />an approved cohesive material having a falling head coefficient of permeability of 1x10-7 cm/sec. <br />or slower. <br />An alternative core trench detail, as presented by Mr. Don Deere of Deere and Ault Consulting <br />Engineers, suggests a trapezoidal deepened core trench/keyway approximately 10-feet in width <br />at the base and approximately 3-feet in depth below the bottom of the reservoir. The installation <br />of the core trench will be dependent upon field conditions as determined during construction. <br />The purpose of the deepened core trench is to minimize seepage out of the reservoir as well as to <br />minimize groundwater inflow into the reservoir. Provided a slope stability analysis and a <br />seepage analysis indicates a shallower core trench is feasibility and performs as design intended, <br />EEC is not opposed to the minimum 3-foot depth keyway as suggested by Deere and Ault. <br />We appreciate the opportunity to be of service to you on this project. If you have any questions <br />concerning this report, or if we can be of further service to you in any other way, please do not <br />hesitate to contact us. <br />Very truly yours, <br />Earth Engineeri <br />Consultants, Inc. <br />David A. Richer, P.E. <br />Senior Geotechnical Engineer <br />Reviewed by: Lester L. Litton, P.E. <br />Principal Engineer <br />cc: ASCI - Mr. Rob Laird: rlaird(e?as hp altspecialties.com <br />Martin/Martin Consulting Engineers: mthornbrouO@i martinmartin.com