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Sitka's Blue Lake Project - by Dean Orbison
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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.

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

Published in News & Politics
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  • Let’s show a plan view or photograph. So far it is not obvious that this dam is curved with a rather short radius.

Transcript

  • 1.  Project Description Reservoir Operation Level Generation Outage Critical Aspects Schedule for Construction Photos of Work
  • 2. Project Description Upper Tunnel Penstock New Crossing Intake Dam Penstock Drainage Tunnel Lower Tunnel Surge Chamber Proposed 15.9 MW Powerhouse
  • 3. Project Description
  • 4. DRAINAGE TUNNEL Project Description
  • 5. Project Description
  • 6. Project Description
  • 7. Project Description
  • 8. Project Description
  • 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. 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