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HomeMy WebLinkAboutPPP Item No. 10 P1-105 Headworks Rehabilitation at Plant No . 1 ( Pl- 105 ell Jeff Mohr, CIP Project Manager May 6, 2015 Headworks Facilities Are Aging 4 w 16 years t: ti t ` r � 23 years 28 years 43 years 57 years r 1 � S i y . Revised Headworks PlanningApproach Starting Year I 2015 2024 I 2015 Cancel Equipment and Material Rehab I X X I X Increase Capacity I X I None** Level of Service Upgrades I X I X Demolish Headworks 1 I X I X Construction Cost, $million I 44 155 I 155 0 ** Flows are decreasing - more capacity not needed in the foreseeable future Rehabilitation of Existing Facilities : l ' M M & D Structure s Bar Screens Bin Loading Main Sewage PS ~� Grit Basins Demolition of Unused Facilities da Headworks 1 6` • Chlorine Building Grit Handling i f J Upgrades and Replacements . ..� -- -- - Replacement IN(A rr- 1 E �� .� pumping capacity Bin Loading ,,; ��J ,j ♦� Modifications 16 Grit Pumping % �s .f (new) ,, . Grit Handling Building (replacement) r Odor Control (upgrades) Power Building 3B 1` y ,� (new) KeyChallenge : Metering & Diversion Box Rehab t-Ij ®7MdNLIJ VINJ r--<-�I r":I r-'Cl r--I=II r-1:1 i i i.l n.., IB'Ludid Newlupe pimii nd UM IB LFsInn No.l 35-OM � SW 5.00fXJ NNP00 5,-0000 £t/A0005 a� + � NHP0005- - -RCP , ® � NNP0010-40" ■! 84'-RCP SAR0005 "0 —! SAN0005-06 ki 5� rJO f 1339r ® `•*J MOiD1S • Needed repairs in box requires taking each major L , sewer line out of service � Requires complex bypass L pumping Risk of upstream impacts �✓ during construction KeyChallenge : ReplacingInfluent Meter Runs Only access to 2A WIN- replace spools is WJ� through ans � opening above a pipe. New 2E monorail needed Walkway must for construction - � be removed 2D , and replaced to replace pipe 2C sections below Severe corrosion ` at top of pipes 2F Key Challenge : Gate Replacements �► y� ..: yr EXPANSION • require •0 Some replacements will require • CHANNELshutdowns and flow 5 TAT ON , diversions 1 "AR SCREEN JM� ROOM Confined space requires advance preparation for construction problems. 1 NO. ,.. r.. © �io. iol �m o TUNNE Ia1�►vl�lO � � TA- 1:1- 11TUNNEL�0. � '11 Iti.I1 i 11 1'_I L_ _ v Key Challenge : Replacing 40 m d Pumping - Capacity T . >- . --`. 16.0 ,s �i � •r Increase capacity of existing pumps Add 2 new pumps to existing PS (potential hydraulic problems) (difficult construction) BAR SCREENS �JEN1 PUMPS Build new, separate pump station (complex to operate, difficult to maintain) tg, c -! Submersible Pumps(3(_n)20 mgd ea KeyChallenge : Plant No . 1 Channel Replacement / High risk tie-in to existing channel KeyChallenge : ReplacingOdor Control System _ ....................................... ��— Scrubbers 1-4 Remai Chemical Facility During Construction V � -C New odor control 10-ft Diameter Scrubbers system must be for 122,000 cfm on-line before Biotowers for Space for Integrated Headworks Foul Air NRW Odor Control in existing can be ;r the Future demolished Design and Construction Costs • Construction Cost = $ 155 million ( revised ) • Predesign and Design Costs — Previous Plant Rehab Projects = 11% to 25% construction cost — Negotiated fee = $17.5 million ( 11% construction cost) Carollo Engineers Most Qualified Firm • Outstanding experience, staff, and a clear approach to understanding and managing risks. • Level of effort increased during negotiations to mitigate future risks — Added design of temporary facilities during construction — Provisions included if more complex alternatives are selected — Design of shoring and dewatering added for protection of existing facilities • Hours are appropriate for complexity of project • Rates are fair and reasonable Recommendations • Cancel Headworks Expansion, Project No . P1-120 • Increase P1-105 project budget awaaoL� Proposed Construction Cost $44,181,000 $155,000,000 Project $76,476,000 $2351273,000 • Approve a Professional Design Services Agreement with Carollo Engineers to provide engineering design services for an amount not to exceed $ 17,528,957 • Approve a PDSA contingency of $ 1,752,896 ( 10%) .