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HomeMy WebLinkAboutItem 12 PPP 12-05-18 Ops Committee - P2-123 Budget Increase _ -- _a ��r V ' r tow Returned Activated Sludge Piping Replacement at Plant 2, Project No . P2- 123 �. THE Project Original P2-123 Piping 8 P2-118 Elements FE18 04 Elements �.1 4` /� Project Elements Current Scope • P2-123 _ Replace 2,000 linear feet of leaking Return Activated Sludge piping Proposed Combined Scope • P2-118 _ Repair corroded and cracked concrete • FE18-04 _ Replace corroded light poles P 2 121,113 P I U • a I ve j������11111kd d I t i o n I WO Insert twelve plug valves to allow isolation of clarifiers 1\� P2 =1 18 ProjectJ Objectives • Mitigate Oxygen Release • Crack repair _ • Expanding polyurethane • Maintain Structural , Integrity of Basin Deck - _. • Spall repair :a Replace corroded reinforcement r i _ . :� _ y .y Spall - = • Hollow concrete but no visual spalling Sounding test revealed 4x more spalling than originally --.{ designed for loe SpaII-- 7 extents of hollow sounding concrete.yet no visual surface / spalling f original demarcated area that was visually .. spalled on surface • �, t �:? .� � f �'�.�:fir, � . i T/0 I r 1 ��"�` } '✓ �! ✓�� THE ENV\P 0 Crack I ... L • Extensive cracking yielded approximately 2x more cracking than estimated 71. 'apt ': 1 4 ��'M FE =18 =04 Objectives ProJject • Replace corroded light poles and fixtures at AS Basins and Secondary Clarifiers099 — High-efficiency LED fixtures with dark sky i shielding r g ,: �•�� • Collapsible poles for P o better maintenance '90 y r P �1 t" F access j THEcr�NC ENV\Poaa* Reasons for Combined Construction • Overlapping locations • Schedule and risk reduction • Economy of scale Budget CurrenLBu ,Jget Proposed Budget BudgetChange P2-123 Piping $12,7501000 $20,000,000 $7,250,000 Replacement P2-118 Aeration $2,800,000 $1,800,000 ($1,000,000) Basin Deck Repair FE18-04 Light Pole $1,950,000 $200,000 ($1,750,000) Total $4,500,000* * Addition funding: $4,500,000 reduction in Plant No. 2 Digester Facilities Rehabilitation, Project No. P2-91-1. This reduction is a result of an unrelated reduction in the anticipated cost of that project. Recommendations • Approve a budget increase of $7,250,000 for Return Activated Sludge Piping Replacement at Activated Sludge Plant No. 2, Project No. P2-123, for a total budget of $20,000,000. Questions