WPC  2"B Z`XArial ItalicArialArial BoldHP LaserJet 4 PlusIIHPLA4PLU.PRS2xCQ\'sZX#|]09ND,C2xjAG;X11mC9,  Xm2PG;XP/qC:,cXq2pPG;X2n T|TOO "4^DDV6OOYAOAADDAwDADn6wD66w6RwDwwwuR?ROAnOOODOOOOOOuOAwCCCCCCCCwwwwwwA6AAA6AAgww6A6[6RRRwwwwTDDwuuu6RwDwwDu414WddddddddddddddddddddddddddddddddddddddddNTT~PYVPTO33PPPPTTyuu3OuO"uu~uu"m+^99Ipp.DDNt9D99pppppppppp99tttp̅}9ep}}999\p.ppepp9pp..e.ppppDe9peeeeE5EtD9sZDDD9DDDDDDpD|9pppppȰepppp99999999pppppppppepp|pepppppeeee|pppppppppppp9.999.99Xeep.p:p.pDp.pxppppȼDDDeeee}L}9}9ppppppe}e}e}epp.pDe}9ee|pp8dp,(,WddddddddddddddddddddddddddddddddddddddddNHxxHlpD|pppppLJpDHpD,,DDpDDxppxHxxHsdd,DdD"dxdldtxxd"m+^:D`pp8DDLt8D88ppppppppppDDttt|Đ|8p|||D8Dtp8p|p|pD||88p8||||LpD|pppdL8LtD8ttDDD8DDDDDDpD|8pppppȰppppp88888888|||||||||pp|||p||ppppppppppp||||||||88888888ppp|8|L|8|`|8|||||ȼLLLpppp|`|D|D||||||p|d|d|d||8|Lp|Dpp||:dp,0,WddddddddddddddddddddddddddddddddddddddddNHxxHppD|pppppLHpDPpD88ddpDDxppxHxxHs||8ddD"dxxldtxxd2  P #Xm2P XP#e  yxdddy Jicarilla Lower Mundo|5`v(#OConceptual Design   #Xm2P XP#  yxdddy Jicarilla Lower Mundoj5`(#OConceptual Design  I.XEXECUTIVE SUMMARY (# XThe Lower Mundo Lake Dam is owned and operated by the Jicarilla Apache Tribe (Tribe). Lower Mundo Dam has been identified as unsafe by the Bureau of Reclamation (BOR) under the Safety of Dams program for the Bureau of Indian Affairs (BIA). Lower Mundo Dam is classified as a high hazard dam.(#  XIn September, 1992 the Tribe retained the BenhamHolway Power Group (BHPG) to perform the following scope of work:(#  R 1.` ` Investigate the safety of Lower Mundo Dam and verify suspected deficiencies.(#`  R\ 2.` ` Perform feasibility studies of a wide variety of potential remedial measures.(#`  R 3.` ` Perform more detailed conceptual design studies of a limited number of preferred remedial measures.(#`  Rs 4.` ` Design and supervise installation of remedial measures selected. Z(#`  XLower Mundo Dam was extensively investigated and analyzed (number 1 from above) resulting in a Deficiency Verification Analysis (DVA) report. The conclusions of the DVA classify Lower Mundo dam as "Unsatisfactory" as defined in the Indian Dams Safety Act of 1994, P.L. 103302August 23, 1994. Interim measures have been implemented to provide early warning for piping failure and normal event overtopping. These measures if used properly result in changing the classification to "Poor". The Feasibility Design Report (number 2 from above) has been completed and the results were used to develop the conceptual design report.(# (,))ԌXThe purpose of this report is to further develop the conclusions and recommendations of the feasibility study and to recommend remedial measures for final design. After these conceptual designs have been reviewed by the Tribe and the preferred alternatives have been determined, final designs will be prepared.(# XSection II of this report gives the purpose of the report and a general description of the existing dam and deficiencies of the existing dam. Section III discusses the hydraulic and hydrologic loading criteria and develops the conceptual design hydraulic improvements. Section IV discusses the geotechnical/embankment design criteria and develops the conceptual design geotechnical improvements. Section V discusses the structural design criteria. Section VI discusses important construction aspects associated with the different remedial measures. Section VII discusses environmental consequences of the remediation alternatives. Section VIII lists the conceptual design alternatives to consider for final design. Section IX evaluates the conceptual design alternatives on the basis of constructability and cost. Section X determines the alternative recommended for final design.(# XThe recommended alternative for final design is Alternative 3 which is shown on Drawings MX222 and MX226. The hydraulic improvement included in this alternative accommodates the Inflow Design Flood (full PMF) by raising the dam crest elevation to a height that provides the necessary detention storage, Elevation 7338. The geotechnical improvements included in this alternative are (,)) as follows: (1) provide an all weather surface crest, (2) provide wire wrapped riprap for spillway scour and dam end cutting protection, (3) replace the spillway weir, and (4) control seepage with the construction of a slurry cutoff through the center of the dam.(#