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<br />Factors of Safety in excess of 2.0 were calculated for end of construction, <br />rapid drewdawn, and steady state seepage condklons. This is well in excess of the <br />minimums required by the regulations. This Is expected since the embankments <br />retain a relatively low height of water and the slopes were conservatively selected <br />to provide a higher degree of stability. The native alluvial clayey sand, and sandy <br />claysoils also possess good engineering propertiesforembankment construction. <br />Foundation conditions are judged relatively good. All these factors combine to <br />produce a high degree of stability for properly constructed pond embankments. <br />Based upon the information from our borings, the native soils should provide <br />a goodfoundationfortheanticipatedembankmentheight. The bearing capacity is <br />more than adequate. The native soils will be suitable material for construction of <br />keywayandembankmentf-alts. The potential settlement due to compressionofthe <br />foundation and embankment Is estimated to be t to 2 inches. <br /> <br />Construction Recommendations <br />Site Preparation. Priorto placing fill, the area should be stripped of organic <br />topsoil or other deleterious materials. Keyway cuts should be installed along <br />the entire embankment length including up abutmentslopes. Soft, loose or <br />wet soils should be removed or stabilized priorto placing fill. Stabilization <br />can consist of gravel crowded Into the unstable soils until a working platform <br />is achieved. <br />Acceptable Fill Materials. Suitable fill materials can be obtained from pond <br />excavations or from off-site borrow sources. Sutable materials include <br />native clay soils, silty to clayey sand soils, and bedrock materials which are <br />broken down to these soil types (SM-SC, SC, GC, CL and CH). Bedrock <br />materials should beprocessed toproduce asoil-like material with a maximum <br />particle size of 3lnches. The materials used as embankment fill should have <br />at least 25 percent fines (material finer than No. 200 sieve). <br />KENNELOTT ENERGY <br />COLOVJYO GOAL COMPANY ~ SOUTH TAYLOR SEDIMENTATION POND 7 <br />GTL~T JOB NO. 36,861 <br />• Exh. 7-20F-11 Revision Date: 1/05/07 <br />Revision No.: PR-02 <br />