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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />TABLE OF CONTENTS <br />Twin lakes Dam & Reservoir <br />Page 2 <br /> <br />CHAPTER V: <br /> <br />PLAN OF DEVELOPMENT <br />1.0 Site Inspections <br />1.1 General <br />1. 2 Dam <br />1.2.1 Description <br />1.2.2 Crest <br />1.2.3 Upstream Face <br />1.2.4 Downstream Face <br />1.2.5 Seepage <br />1.3 Outlet Works <br />1 . 4 Spil h~ay <br />1.5 Summary of Deficiencies <br />2.0 Geotechnical Evaluation <br />2.1 Field Investigation <br />2.1.1 General <br />2.1.2 Geologic Mapping <br />2.1.3 Subsurface Investigation <br />2.1.3.1 Oam <br />2.1.3.2 Spillway <br />2.1.3.3 Borrow Area <br />2.2 Laboratory Testing <br />2.3 Slope Stability of Existing Dam <br />2.3.1 Procedure <br />2.3.2 Pore Pressures <br />2.3.3 Material Properties <br />2.3.4 Failure Surface <br />2.3.5 Results <br />2.4 Existing Seepage Conditions <br />2.5 Summary of Existing Conditions and <br />Recommended Interim Operation Restriction <br /> <br />PAGE <br /> <br />41 <br />41 <br />41 <br />41 <br />41 <br />43 <br />43 <br />43 <br />43 <br />44 <br />45 <br />45 <br />45 <br />45 <br />45 <br />46 <br />47 <br />47 <br />48 <br />49 <br />49 <br />50 <br />50 <br />51 <br />52 <br />54 <br />54 <br />55 <br />56 <br />