WPC 2B ZR#|e HP LaserJet 4HPLAS4.PRS 42xCQ\ZiXArial ItalicArialArial Bold2Xv"m^CCUՠ5PP]CPCCCCCxȭ㠠CCCq5xC55x5ȅPxCxxxxP>PPCPP(PPP4PPPPPPuPCy_y_y_y_y_u[c[c[c[c[44444444}_y_y_y_y_y_y_y_y_l_y_yy_l_y_l_xxxxC+CCC5CCVxx555[I5PPPxpVxxCCC㭠xxlNx5PxCxxNTCPYXAAuuA.4PPPP酅uuuyxx5PuA"m^99Irr.EEPx9E99rrrrrrrrrr99xxxrщ~9gr~‰~999`r.rrgrr9rr..g.rrrrEg9rggggE5ExE9EE"EEE,EEEEEEdE~9oYoYoYoYoYηhQ]U]U]U]U40404040s]oYoYoYoYo]o]o]o]hYoYor~oYhYoYhYrrrggggrrrrrrrrrrrrr90999.99`ggr.r.r.UFr.rwrrrr•EEEgkQgg~9~9~9rrrrrr•g~g]J~grr.rEg~9ggrrrNH9nrE~rrrrrLKr??ddr?',EErEErrzzdddsgg.Ed?R U9NC,)+2xjAX V1mC9, Xm2PXP /rC9,=Xr2pPXl_xxxx"m^9Earr9EEPx9E99rrrrrrrrrrEExxx~ɕ~9r~~‰~E9Exr9r~r~rE~~99r9~~~~PrE~rrrgP:PxE9EE"EEE,EEEEEEdE~9oYoYoYoYoYηhQ]U]U]U]U40404040s]oYoYoYoYo]o]o]o]hYoYo~~oYhYoYhYrrrrrrr~rrrr~~~~~~~~90999999`rr~9~9~9UF~9~w~~~~•PPPrkQrr~E~E~E~~~~~~ r~g]J~g~~9~Pr~Err~~~NH9rrE~rrrrrLKr??ddr?1,ggrEErrzzddds~~9gd?2 P #Xm2PXP#+  yxdddy Jicarilla Dulcex'`V(#5Conceptual Design   I.XEXECUTIVE SUMMARY (# XThe Dulce Lake Dam is owned and operated by the Jicarilla Apache Tribe (Tribe). Dulce 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). Dulce Lake 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 Dulce Lake 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.(#`  R 4.` ` Design and supervise installation of remedial measures selected.(#(#Y(#` XDulce Lake Dam was extensively investigated and analyzed (item 1 from above) resulting in a Deficiency Verification Analysis (DVA) report. The conclusions of the DVA classify Dulce 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 improving the classification to "Poor". The Feasibility Design Report (item 2 from above) has been completed and the results were used to develop the conceptual design report.(# XThe 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 the conceptual designs have been reviewed by the Tribe(,)) and the preferred alternative selected, final designs will be prepared.(# XSection II of this report identifies the purpose of the report, provides a general description of the existing dam and lists deficiencies of the existing dam. Section III discusses the hydrologic design 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 considered for final design. Section IX evaluates the conceptual design alternatives on the basis of constructability and cost. Section X develops the recommendation for final design alternative.(# XThe recommended final design alternative is identified as Alternative 4 and shown on Drawings DX221 and DX222. The hydraulic improvements included in this alternative are as follows: (1) precast concrete boxes for service spillway and (# (2) remove and replace outlet works. The geotechnical improvements included in this alternative are as follows: (1) place roller compacted concrete on downstream slope for overtopping protection and (2) partial removal and replacement of foundation with dynamic compaction. These improvements were chosen on the basis of constructability, cost and overall site applicability.