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HomeMy WebLinkAboutItem 7 PPP 01-16-19 Operations Comm Meeting - P1-105 J Gas O ro N � •� E U ' o o 4-j U 0 • o Ca i ateJ roLn N � t ro ro r\ UJ L.f) .b a �� r' Headworks Facilities Are Aging IT ,, :;, ` 16 years 23 years 28 years 43 years 57 years Rehabilitation of Existing Facilities TIC" • M & D Structure Bar Screens • Bin Loading �►� �,. r>> • Main Sewage PS - � � • Grit Basins ' I Demolition of Unused Facilities '6 vow ✓'" ' tt 1� IV r , Headworks 1 ter:cz , i►) ��� ` �<< • Chlorine _..-- ? . 0 Building `G • Grit Handling y Upgrades and Replacements • Replacement I-N` 1' 10 - - pumping capacity Bin Loading Modifications A i Grit Pumping • �f ";, �.� . � (new) �' ' . • Grit Handling r ., Building (replacement) " • Odor Control (upgrades) y Power Building 3B (new) KeyChallenge ,MMMetering & Diversion Box Rehab t� ,��Q �sar,+oolv.a000 f�.ds i i i.l n.. IB'Ludid Newlupe pimii nd UM IB LFsInn No.l SU 5-OM NHPOO t 5 l)000 i` -- £t/A0005 NHP"5- -RCP SAR"5 32N O-0lk,_ ,�SAwOO r • Needed repairs in box sAN000s a �® ,*) Ndol5-�WW requires taking each major _ sewer line out of service Requires complex bypass pumping • Talbert Trunk requires lining • Risk of upstream impacts during construction KeyChallenge ReplacingInfluent Meter Runs 2A Only access to replace spools is . «t through an opening above a pipe. ,�1 New monorail needed for 2B construction 2E �i, �•� .00' 2C •� Walkway must 4 be removed Severe corrosion at top of pipes and replaced to replace pipe sections below KeyChallenge Gate Re I a ce m e nts p /�� EXIST ME�'EFIRO AND DWEPSIO.I�j / (Mt 0 STRUL`GURE is 110 gates is Major shutdowns L. ` required INL T � SUNFLOWER CMaNNEL �f� '� r $TAT ION 1 2 3 4 • Confined space p � I entry requires 1,OAR SCREEN IMP ROOM. advance -- 10 preparation for construction ° l p • roblems � �°° L,R GI s t is April 2018: $2. 1 5 6 7 8 9 10 T million Consultant TUNNE contingency for - GRIT c11AM g Y TUNNEL�. G1O gate inspection and minor repair - - '- ITT R % work i il;l I KeyChallenge Replacing 40 an d Pumping Capacityif � -M CFD modeling shows flow separation I' '• 1', through existing pump intakes at80 mgd.When evaluating alternatives, Carol le will use the CFD model to 0 evaluate improvements thatcuuld resolvethls issue. ' Increase capacity of existing pumps Add 2 new pumps to existing PS p Y g p p Modifying (difficult construction) (potential hydraulic problems) existing inlet provides best "" Build new, separate HAR value and reduce 'i s, pump station t ------ .. (complex to operate, _ project risk ^� J difficult to maintain) RIF • MSP Intake . :_ Replacement for • ��J�Q� ,��� ,, �P Hydraulic ti rQ A n _ Influence mod ._ Submerslble Pumps 13 a 70 mgi �ti Compliance Key Challenge Replacing Odor Control System • Existing system performs adequately • No redundant scrubbers handling• Additional capacity needed for grit • Must remain in service during • • • Remaining useful life 10 years V' I Diameter Scrubbers7 for 122,000 ctm Space tor •g. iNRW � '.� tunControl the C KeyChallenge mmim Electrical Distribution • Headworks is a major electrical _ , load • Critical for water in/out -••, ,___- z - • Upsized pumps require medium =H� • v ___ voltage supply A = _ _k • Two standby generators need replacement • Separation of electrical 480-volt Motor Control Center MSPs equipment to avoid single point = of failure Sl` Antlers"n ft St�h"n W,�s:eh�uie� 480-volt Switchgear m e 3b qq B � °Gcq 7 F¢8 y e4-$�yr S1s° DYds GF> 0 Y s"�ih N T—V6 Power BuilEing]A P"we — BuIlmnq] e Power Building 3A New sGBIa Pow weab P.. ° er "q Existing Project Timeline Preliminary Design Completion/Project Design Validation Submittal 1 Preliminary Final Design 40 Design Design Start Start Submittal 2 2016 2018 0.4 0.4 1 f 7 Evaluation Phase Preliminary Design Phase Final Design Phase Project Validation Design Submittal 2 Required Budget: $425 million onstruction Cost : $295 million Project Budget Current Authorization Project Budget: $370 millionStaff is workingthrough design options ' Construction Cost: $255 million � will return with recommendedchangesto - . the totalbudget million Reduced Scope Project Budget: $370 million Construction Cost: $255 million Pl- 105 Value EngineeringOpportunities Construction14 P1-105 . • • • • • 'md • 1 Defer grit handling ($14million) 2 Defer odor control ($23 million) 3 Replace two additional generators +$5 million 4 Electrical Feed from CenGen instead of Service Center ($2 million) 5 Additional value engineering opportunities ($5 million) Total ($39 million) Reduction Opportunity 1- Defer Grit Handl ing • Potential Savings $14 million .4ir Design i n : :ky • Savings: No further design required _ • Additions: Rehabilitation design from scratch • Lose benefit of better grit capture and less _ odorous grit _ -- w �w • Facility can be built in future ' Opportunity 2 : Defer odor control • Potential Savings $23 million40 - - �` • Design Impact: • • _ i-- y _ J • Savings: No [ p further design required � = - /if 9 • Interim maintenance and repairs required ` Q • Facility can be built in future OF 1 <,. Opportunity 3 - Install two additional generators • Potential Cost $5 million �! • Replaces three end-of-life =- generators for secondary treatment and solids processes . • Installed in Standby Generator Building built with this project • .0090 • Centralization of generators, commonality of equipment • Design Impact: • New design effort • These generators could be ..� installed after P1-105 completion Opportunity4- Electrical Feed from CenGen instead of Service Center r • Potential Savings $2 million • Design Impact: • Minimal • Single point of failure at CenGen until replacement of CenGen switch in .j gear 2022. PB3A e: PB3 Li 7O N"12-kV Duct Bank Next Steps • Work with Consultant to 19 balance: ' rr • requirements uirementsr- � I • Construction costs "` Y • Design impacts • Construction duration i! -RI Y • Negotiate design changes before proceeding • Bring recommendations to the Operations Committee and _ = Board of Directors on final design scope and appropriate F budget adjustments �, • 4 g, - . -bpV . W N U E o. ° Ln •- a--+ p a Ln