Sitka's Blue Lake Project - by Dean Orbison

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A presentation by Sitka Electric Dept. generation engineer Dean Orbison to the Chamber of Commerce on 2-13-13.

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Sitka's Blue Lake Project - by Dean Orbison

  1. 1.  Project Description Reservoir Operation Level Generation Outage Critical Aspects Schedule for Construction Photos of Work
  2. 2. Project Description Upper Tunnel Penstock New Crossing Intake Dam Penstock Drainage Tunnel Lower Tunnel Surge Chamber Proposed 15.9 MW Powerhouse
  3. 3. Project Description
  4. 4. DRAINAGE TUNNEL Project Description
  5. 5. Project Description
  6. 6. Project Description
  7. 7. Project Description
  8. 8. Project Description
  9. 9.  Blue Lake is Sitka’s drinking water source. The water must meet drinking water standards during construction and commissioning. The Blue Lake hydro project must be operated to meet existing electrical loads during construction. We have limited ability to control lake level. The timing of the Generation Outage is established by the seasonal reservoir inflow not our ability to prepare for the outage.
  10. 10. GENERATION OUTAGE MUST GO LIKE CLOCKWORK AT MULTIPLE SITES – MAJOR WORK ITEMS ARE: INTAKE TUNNEL CONNECTION; PLUG OLD TUNNEL; OPEN UP NEW ONE STEEL LINER INSTALL AT NORTH AND SOUTH PORTALS (NEAR FVU) SURGE SHAFT CONNECTION STEEL LINER AT LOWER PORTAL PENSTOCK SECTIONS REMOVAL AND REPLACEMENT WITH ANCHOR BLOCKS WET TEST FIXED WHEEL GATE; FILL POWER TUNNEL WET TEST NEW TURBINE AND GENERATOR – ONE UNIT ONLY COMPLETE MILESTONE 5 – OPERATION OF FIRST UNIT AT 75% GATE BY OWNER FOR 12 HOURS

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