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  • > l ð U t > l v r& u u Z Z ] o ] ] } v t l o Ç } v µ ] } v h Z } í l ò l î ì î ... · 2020. 1. 16. · Title: Weekly Report: Lake 4, West Lake and A-Frame Dam Rehabilitation
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Lake 4, West Lake and A-Frame Dam Rehabilitation Weekly Construction Update Report 1/6/2020 to 1/10/2020 Work in Progress/Completed 1. Project re-start initiated on Jan. 6th 2. Started Lake 3 embankment excavation of sub-grade foundation and clay-core trench; located existing slurry wall tie-in; initial placement of embankment material on downstream side of clay-core trench. 3. West Lake Dam foundation prep for outlet tower and pipeline. Tied rebar and had rebar inspection in anticipation of concrete pour for tower foundation on Tuesday Jan. 14th. 4. Mitigated Foothills Outlet Ditch nuisance water coming into work area by implementing a temporary cutoff ditch to Kidney Pond. 5. Demo’d and removed the final portion of Foothills Outlet Ditch siphon and started additional excavation of embankment and new outlet siphon foundation . 6. Haul road construction through the bottom of Lake 4 and the Lake 4 breach to provide access to West Lake Dam and West Lake disposal site was completed. 7. Longmont Power temporarily re-located two power poles out of the A-Frame outlet work area on 61st Street. 8. Material generation/processing plant was finalized in Lake 4 bottom and approx. 8700 tons of rip-rap bedding was processed. 9. Prepped the clay material source site for clay delivery and began hauling clay to the project site. Deliveries of filter sand for Lake 3 Dam started. 10. Continued dewatering operations to remove nuisance water in Lake 4, Lake 4 and West Lake and re-started the dewatering operation in A-frame Pond Date: 1/15/2020 Project Owners: Boulder County and St. Vrain & Left Hand Water Conservancy District Location: Boulder County Open Space west of Hygiene, CO Contractor: Kirkland Construction Weather & Site Conditions: Dry, cold weather Update by: Obadiah Broughton, Boulder County 1/6: Test pit to locate bedrock for Lake 3 embankment sub-grade foundation and clay-core trench tie-in . 1/9: Initial excavation of Lake 3 embankment sub-grade foundation and clay-core trench

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Page 1: > l ð U t > l v r& u u Z Z ] o ] ] } v t l o Ç } v µ ] } v h Z } í l ò l î ì î ... · 2020. 1. 16. · Title: Weekly Report: Lake 4, West Lake and A-Frame Dam Rehabilitation

Lake 4, West Lake and A-Frame Dam Rehabilitation Weekly Construction Update Report

1/6/2020 to 1/10/2020

Work in Progress/Completed1. Project re-start initiated on Jan. 6th2. Started Lake 3 embankment excavation of sub-grade foundation and clay-core

trench; located existing slurry wall tie-in; initial placement of embankment material on downstream side of clay-core trench.

3. West Lake Dam foundation prep for outlet tower and pipeline. Tied rebar and had rebar inspection in anticipation of concrete pour for tower foundation on Tuesday Jan. 14th.

4. Mitigated Foothills Outlet Ditch nuisance water coming into work area by implementing a temporary cutoff ditch to Kidney Pond.

5. Demo’d and removed the final portion of Foothills Outlet Ditch siphon and started additional excavation of embankment and new outlet siphon foundation .

6. Haul road construction through the bottom of Lake 4 and the Lake 4 breach to provide access to West Lake Dam and West Lake disposal site was completed.

7. Longmont Power temporarily re-located two power poles out of the A-Frame outlet work area on 61st Street.

8. Material generation/processing plant was finalized in Lake 4 bottom and approx. 8700 tons of rip-rap bedding was processed.

9. Prepped the clay material source site for clay delivery and began hauling clay to the project site. Deliveries of filter sand for Lake 3 Dam started.

10. Continued dewatering operations to remove nuisance water in Lake 4, Lake 4 and West Lake and re-started the dewatering operation in A-frame Pond

Date: 1/15/2020Project Owners: Boulder County and St. Vrain & Left Hand Water Conservancy District Location: Boulder County Open Space west of Hygiene, CO Contractor: Kirkland ConstructionWeather & Site Conditions: Dry, cold weatherUpdate by: Obadiah Broughton, Boulder County

1/6: Test pit to locate bedrock for Lake 3 embankment sub-grade foundation and clay-core trench tie-in.

1/9: Initial excavation of Lake 3 embankment sub-grade foundation and clay-core trench

Page 2: > l ð U t > l v r& u u Z Z ] o ] ] } v t l o Ç } v µ ] } v h Z } í l ò l î ì î ... · 2020. 1. 16. · Title: Weekly Report: Lake 4, West Lake and A-Frame Dam Rehabilitation

Lake 4, West Lake and A-Frame Dame RehabilitationWeekly Construction Update Report

Upcoming Work (One week look ahead. Week of 1/13/2020 to 1/17/2020)

1. West Lake Dam outlet tower and pipeline: concrete pour for tower foundation is scheduled for Tuesday Jan. 14th; fusing of 20” HDPE outlet pipe to commence; final foundation prep prior to form work

2. Continued excavation of West Lake Dam embankment and new outlet siphon foundation.

3. Continued excavation of subgrade and clay core trench to bedrock for Lake 3 embankment repair. Begin placement of clay core and filter sand for Lake 3 embankment

4. Finalize sub-grades and foundations for Lake 4 Dam towers. Prepare forms, rebar.

5. Begin Lake 4 spillway sub-grade excavation.6. Continue to import clay material to project site for West Lake, Lake 3

embankment, and Lake 4 dam reconstruction.7. Continued dewatering operations to remove nuisance water from project site.

Additional Notes1. Weekly construction process meeting was held at the jobsite trailer on Jan.

14th

2. To facilitate the A-Frame Pond outlet structure and Lake 4 pipeline outlet pipe work, N. 61st and 63rd streets will be temporarily closed for up to two months starting on Monday Jan. 20th

3. Project website for updates and information: https://www.bouldercounty.org/open-space/management/lake-4-west-lake-a-frame-pond/

Looking north on 1/10: Compacted Lake 3 embankment

1/10: Roller test for Lake 3 embankment2

Page 3: > l ð U t > l v r& u u Z Z ] o ] ] } v t l o Ç } v µ ] } v h Z } í l ò l î ì î ... · 2020. 1. 16. · Title: Weekly Report: Lake 4, West Lake and A-Frame Dam Rehabilitation

Lake 4, West Lake and A-Frame Dame RehabilitationWeekly Construction Update Report

Looking north 1/7: Demolition of Foothills Outlet Ditch siphon intake structure

3

1/9: West Lake Tower formed slab and rebar

1/7: Demo’d Foothills Outlet Ditch siphon pipe 1/9: Additional rebar onsite at West Lake Dam tied and ready for placement in outlet structure.

Page 4: > l ð U t > l v r& u u Z Z ] o ] ] } v t l o Ç } v µ ] } v h Z } í l ò l î ì î ... · 2020. 1. 16. · Title: Weekly Report: Lake 4, West Lake and A-Frame Dam Rehabilitation
Page 5: > l ð U t > l v r& u u Z Z ] o ] ] } v t l o Ç } v µ ] } v h Z } í l ò l î ì î ... · 2020. 1. 16. · Title: Weekly Report: Lake 4, West Lake and A-Frame Dam Rehabilitation
Page 6: > l ð U t > l v r& u u Z Z ] o ] ] } v t l o Ç } v µ ] } v h Z } í l ò l î ì î ... · 2020. 1. 16. · Title: Weekly Report: Lake 4, West Lake and A-Frame Dam Rehabilitation

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