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Home My WebLink About03.b. Review draft Position Paper to authorize the General Manager to amend an existing professional services agreement with Stantec Consulting Services, Inc. to increase the contract ceiling from $990,000 to $1.54 million for design of the Filter Plant Page 1 of 29 Item 3.b. CENTRAL SAN BOARD OF DIRECTORS POSITION PAPER DRAFT MEETING DATE: APRIL 16, 2019 SUBJECT: REVIEW DRAFT POSITION PAPER TO AUTHORIZE THE GENERAL MANAGER TO AMEND AN EXISTING PROFESSIONAL SERVICES AGREEMENT WITH STANTEC CONSULTING SERVICES, INC. TO INCREASE THE CONTRACT CEILING FROM $990,000 TO $1.54 MILLION FOR DESIGN OF THE FILTER PLANTAND CLEARWELL IMPROVEMENTS - PHASE 1A, DISTRICT PROJECT 7361 SUBMITTED BY: INITIATING DEPARTMENT: CHATHURAABEYRATHNA, ASSOCIATE ENGINEERING AND TECHNICAL SERVICES- ENGINEER CAPITAL PROJECTS REVIEWED BY: CRAIG MIZUTANI, SENIOR ENGINEER EDGAR J. LOPEZ, CAPITAL PROJECTS DIVISION MANAGER JEAN-MARC PETIT, DIRECTOR OF ENGINEERING AND TECHNICAL SERVICES ISSUE Board of Directors (Board) authorization is required for the General Manager to execute an amendment to a professional engineering services agreement for amounts greater than $100,000 for agreements originally valued under$1,000,000. BACKGROUND On May 3, 2018, the Board authorized the General Manager to execute an agreement with Stantec Consulting Services, I nc. (Stantec)for the preliminary design of the Filter Plant and Clearwell Improvements, District Project 7361 (Filter Plant Project) at a cost ceiling of $990,000. The Stantec scope of work consisted of numerous field investigations, condition assessments, workshops, meetings (with Operations, Maintenance, Planning, and Capital Projects), pilot testing, coordination with future projects, 3-D scanning, and other important efforts to comprehensively evaluate the Filter Plant and appurtenant facilities. Several technical memorandums (TM)were prepared to recommend needed solutions. These memorandums include: TM 1 - Disinfection; TM 2 - Hydraulic Evaluation; TM 3 - Seismic Assessment; and TM 4 - Filter Plant Process and Automation. Stantec summarized all the findings in the Alternatives April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 12 of 42 Page 2 of 29 Analysis Technical Memorandum (TM 5)that will form the basis of design of the Filter Plant Project. This summary includes filter rehabilitation, chemical conditioning, Clearwell modifications, Clearwell Pump Station upgrades, and related electrical distribution system upgrades.A scope of work summary of these improvements is included in Attachment 1. Overall, the planning level cost for the total project scope outlined in Attachment 1 is estimated at approximately$53 million. These improvements would provide a reliable Utility Water system for the plant and serve current and future Zone 1 customers. In addition to this work, Stantec evaluated and coordinated the project with the future requirements of the Concord Community Reuse Project (CCRP), formerly known as the Concord Naval Weapons Stations Development Project. This future expansion would require approximately$35 million in infrastructure improvements to the recycled water system at the treatment plant. However, due to the possibility of a water exchange project, the project team re-evaluated the project's immediate needs, which include the most critical items that require replacement within the next five years and do not conflict or potentially leave stranded assets due to the water exchange. Therefore, staff recommends proceeding with a reduced scope of work for the Filter Plant Project to include the most critical items in a phased approach overtime. The reduced Filter Plant Project, which will be reflected as Phase 1 A, will include rehabilitation of one filter, recycled water storage, and electrical modifications as identified in Attachment 2. The total estimated project cost for Phase 1 A is $33 million, of which $25 million is the construction estimate as shown in Attachment 3. This cost could potentially be less if the storage tank(s) option proves to be feasible and more cost effective. CEQA At the December 1, 2016 meeting, the Board independently found that the agreement with this vendor was exempt from CEQA under Central San's CEQA Guidelines Section 15262, since it allowed for further planning and feasibility studies for possible future actions which Central San has not approved, adopted, or funded, and the outcome of these tasks will not have a legally binding effect on later activities. Central San will conduct an environmental evaluation of any capital project that is proposed in the future as a result of the tasks authorized herein to determine the need for any additional CEQA documentation. ALTERNATIVES/CONSIDERATIONS Although the current budget has adequate cash funding for the final design, it is anticipated that Central San will most likely request a low interest loan from the State Revolving Fund or request bond financing to construct the project.This decision will be presented at a future Board meeting and no action is required at this time. An alternative would be to not amend the agreement, which is not recommended because the action would delay staff's ability to implement this project that is intended to maintain a reliable recycled water supply system that is not only essential for Zone 1 customers but also supplies the treatment plant with utility water. FINANCIAL IMPACTS The Filter Plant Project- Phase 1A requires a Stantec agreement amendment of up to $550,000 to include 30-percent design services for the critical items identified and recommended by staff. The original Stantec agreement cost ceiling is $990,000, and approval of the $550,000 amendment will increase the cost ceiling to $1,540,000. Final design services is expected to reach $1 million, which would result in a Stantec agreement of roughly$2.5 million or 10-percent of the estimated $25 million construction cost. April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 13 of 42 Page 3 of 29 COMMITTEE RECOMMENDATION The Engineering and Operations Committee reviewed this subject at the April 16, 2019 meeting and recommended RECOMMENDED BOARD ACTION Authorize the General Manager to amend an existing professional services agreement with Stantec Consulting Services, Inc. to increase the contract ceiling from $990,000 to $1.54 million for design of the Filter Plant and Clearwell I mprovements - Phase 1 A, District Project 7361. ATTACHMENTS: 1. Filter Plant Project Scope of Work 2. Filter Plant Project- Phase 1 A Scope of Work 3. Estimated Capital Costs of Recommended Items 4. Project Presentation 5. Supplemental Information Presentation April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 14 of 42 Page 4 of 29 Attachment 1 Scope of Work Summary Filter Plant and Clearwell Improvements District Project 7361 Filter Plant Project The following is a summary of the scope of work for the Filter Plant Project: 1. Filter Rehabilitation — Condition assessment revealed damaged underdrains and disturbed gravel in one of the filters. The existing four filters can only reliably produce 2.25 million gallons a day/per filter (MGD/filter). Filter piping, instrumentation, and controls should be upgraded to ensure reliable automation to support continuous operation without full-time operator attendance. Replacement of two filters was recommended at first, with the other two in the future. 2. Chemical Conditioning — The existing hypochlorite system is undersized for current peak demands and the piping system has experienced several failures. Hypochlorite piping and valves should be replaced. Chemical feed pumps should be replaced as needed. The alum system should be rehabilitated or retired, and a new polymer feed system should be installed for conditioning of the filter influent, based on the pilot test results. 3. Chlorine Contact Basins — Currently, the recycled water system does not have dedicated chlorine contact basins (CCBs), and the filtered effluent pipeline and the Clearwell are used to meet the chlorine contact time requirement. Installing two fixed volume CCBs will optimize the disinfection process, reduce chemical costs, and allow maintenance of the basins or Clearwell. 4. Clearwell Modifications — The existing membrane cover of the East Clearwell continues to deteriorate rapidly. It should be removed and replaced with a new membrane cover. The existing liner should be replaced in both the East and the West Clearwell. The isolation gates at the Clearwell Inlet Structure and Outlet Structure should be replaced and retrofitted with gate frames for stop log placement to allow the gates to be inspected and serviced. The reinforced concrete divider wall in the Clearwell and adjacent overflow structure should be structurally modified to meet current seismic standards. 5. Clearwell Pump Station (CWPS) — The existing backwash and applied water pumps have 2400-volt (V) motors that are inefficient, obsolete, and do not have variable frequency drives (VFDs) suitable to meet operation needs. Utility Water (UW) is essential to many treatment plant processes. However, the current UW system does not have a backup pump. The existing CWPS should be modified Page 1 of 2 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 15 of 42 Page 5 of 29 with the addition of one UW pump to provide firm pumping capacity for UW service. The 2400V electrical motors of the existing filter Backwash Pumps should be replaced with new 480V electrical motors to accommodate the electrical service improvements described below and to enable the installation of VFDs. 6. Electrical Distribution System — The existing electrical distribution system is outdated and unreliable. Parts for most of the electrical equipment are no longer available and difficult to obtain. 2400V systems are no longer used in the industry due to inefficiency and will be abandoned/replaced with industry standard 480V and 12kV systems. Changes to the electrical distribution systems include a new Substation that transforms power from 12kV to 480V to replace Substation 40. All the existing motor control centers (MCCs) will be demolished, replaced, and should include VFDs. The new MCCs and VFDs for the CWPS will be housed in a pre-engineered building designed for weather protection and climate control, and the remaining electrical will be housed inside the Filter Plant. Page 2 of 2 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 16 of 42 Page 6 of 29 Attachment 2 Scope of Work Summary Filter Plant and Clearwell Improvements - Phase 1A District Project 7361 Filter Plant Project— Phase 1A Staff recommends the following reduced scope of work for Phase 1A: 1. One filter of the existing four filters will be rehabilitated to confirm that the filter can reliably operate at a filtration capacity of 4.5 MGD/filter. The chemical conditioning will be limited to the filter replacement and include hypochlorite piping and valve replacement due to safety concerns. 2. The location and feasibility to install CCBs will be evaluated under this project. Only a preliminary design concept identifying location and dimensions will be produced so that staff can designate the area within the treatment plant and will include a hydraulic analysis. 3. Lifecycle costs for finished recycled water storage tank(s) (pre-stressed concrete or steel) will be evaluated to compare with the lifecycle costs of rehabilitating and maintaining the existing Clearwell. If storage tank(s) are cost beneficial, then staff will include it in the project. 4. Substation 40 will be modified to allow 480V power to the CWPS. The new MCCs and VFDs for the CWPS will be housed in a pre-engineered electrical building. A new 12kV electrical feed will be installed from Substation 40 to the new electrical building. Page 1 of 1 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 17 of 42 Page 7 of 29 Attachment 3 Filter Plant and Clearwell Improvements — Phase 1A District Project 7361 Estimated Capital Costs of Recommended Items Design, Staff, Total Total Project Project Component and Other Costs' Construction Cost Cost Filter Improvements $930,000 $3,100,000 $4,030,000 Chemical Conditioning System Rehabilitation $270,000 $900,000 $1,170,000 Clearwell Improvements $3,430,000 $11,100,00 $14,530,000 Clearwell Pump Station Upgrades $910,000 $2,700,000 $3,610,000 Electrical Distribution System Upgrades $2,460,000 $7,200,000 $9,660,000 Total Capital Costs $8,000,000 $25,000,00 $33,000,000 Includes approximately $2.5 million for the Stantec Consulting Services, Inc. professional engineering services agreement, planning, and construction management. April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 18 of 42 Page 8 of 29 FILTER PLANT AND CLEARWELL IMPROVEMENTS, PHASE 1A DISTRICT PROJECT 7361 - - Engineering and Operations Committee April 16, 2019 Jean-Marc Petit Director of Engineering and Technical Services 1 . PROJECT OBJECTIVES AND BACKGROUND 2 CENTRALSAN 1 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 19 of 42 Page 9 of 29 INITIAL PROJECT OBJECTIVES • Improve performance and reliability of the Recycled Water Plant(RWP) o Filtration o Disinfection o Recycled Water(RW)storage and distribution (UW and Zone 1) o Electrical Systems • Modernize Automation and Control of RWP o Migrate from batch operation to continuous operation o Facilitate unattended operation • Position RWP to meet future RW Title 22 demands • Maximize asset value of existing facilities --~- - �• o Rehabilitate , o Repurpose • Minimize investment in infrastructure for future RWP expansion • Evaluate Impact and possible integration of Concord Redevelopment and Water Exchange Projects 3 CENTRALSAN EXISTING RECYCLED WATER PLANT FACILITIES Clearwell Pumping Station(PS • Backwash(BW)Pumps " RW Pumps(Zone 1) UW Pumps Clearwell: East West Substation 40 CW Cw Filters(4) R[ _ Chemical Conditioning Filter Effluent Pipeline .T Filter BW Basin - - - Filter Diversion Structure Forebays - Applied Water PS f 4 2 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 20 of 42 Page 10 of 29 2. PROJECT FINDINGS AND RECOMMENDED IMPROVEMENTS 5 SUMMARY OF KEY FINDINGS AND RECOMMENDED IMPROVEMENTS it 1. Electrical Power Distribution & Motor Control Centers (MCC) 2. Structure 9000 and Forebays 3. Filters 4. Clearwell - 5. Disinfection 6. Filter Building s y Ark 3 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 21 of 42 Page 11 of 29 Key Project Issues: [ ' Ilk d `'� Mechanical, � tructural and Failing ElecMcal Equipment;and '-� "� - East Cell Clearwell CWPS Pump Condition and ��' Cover and Liners Sizing t Combined Storage �q and CIz Contact Filter Capacity and Basins E�racy Condition r - Pipeline and Pipe Eleddcal Power ~ � , Distribution Voltage Supports Condition and Reliability �: Water duality and Hydraulic Bottleneck Filter Building into Forebays Condition and Code _„>_ '- Upgredes r Electrical Equipment;and AWPS Pump Condition and Sizing 3. PROJECT PRIORITIZATION AND PHASING � B 4 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 22 of 42 Page 12 of 29 RECOMMENDED IMPLEMENTATION • Split Phase 1 recommendations: • Phase 1A: Proceed with 30% Design on elements of the project that would not be impacted by a future Water Exchange project • Phase 1 B: Postpone improvement or rehabilitation of other elements that could be impacted if a Water Exchange project was to proceed • Plan for, but not include, elements of Phase 2 into design which would be triggered and coordinated with CCRP � 9 PROPOSED PHASE 1A SCOPE FOR RECYCLED WATER PLANT FACILITIES IMPROVEMENTS • Add UW Pump • Replace BW Motors(480V) • New 1 MG Storage Tank • Clearwell: • Rehab East Clearwell Seismic Pining of divider wall • New Isolation Gates - • Rehab 1 Filter+meth. • Upgrade Chemical Feed New-R4tlP5-(B ercmp I e s Forebays) Retire Fe,ebays Upgrade/Replace Electrical Gear Retre-Emstin�AWpS New CW Electrical Facility Replace Substation 40-2400V o) 1a, ly 10 5 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 23 of 42 Page 13 of 29 TOTAL PROJECT COST - PHASE 1 A) Attachment 7 Filter Plant and CI"rwelI Improvements—Phase 1A District Project 7301 Estimated Capital Costs of Recommended Items Design,Staff Total Total Project Project Component and Other Costs' Construction Cost Filter Improvements $930,900 $3,100,009 $4.030.000 Chemical Conditioning System Rehabilitation $270900 $9001700 $1,170,000 Clearwell Im rovements $3430,900 $11,100,00 $14.530,000 Clearwell Pump Station Upgrades $916,000 $2,700,000 53.610,000 Electrical Distribution System Upgrades $2,460,000 57,200,000 $9,660,600 Total Ca ital Casts $8,000,000 $2S,Q6Q,OQ $33 000 Q00 r Includes$2.5 million for Stantec Consulting Services,Inc.protessional engineering servicn ayeement. 11 4. PROJECT SCHEDULE PHASE 1A CENTRAL SAN 6 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 24 of 42 Page 14 of 29 Brjj ba g 90% k to E&O Submit Application for SRF C AO13 5. RECOMMENDATIONS 7 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 25 of 42 Page 15 of 29 RECOMMENDED BOARD ACTIONS Staff recommends the following: • Authorize the General Manager to amend an existing professional services agreement with Stantec Consulting Services, Inc. to increase the contract ceiling from $990,000 to $1.54 million for design of the Filter Plant and Clearwell Improvements, Phase 1A, District Project 7361 15 CENTRALSAN _ QUESTIONS 16 CENTRALSAN s April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 26 of 42 Page 16 of 29 FILTER PLANT AND CLEARWELL IMPROVEMENTS, PHASE 1A DISTRICT PROJECT 7361 - - Engineering and Operations Committee April 16, 2019 - I SUPPLEMENTAL INFORMATION SUPPLEMENTAL INFORMATION PROJECT FINDINGS AND RECOMMENDED IMPROVEMENTS 2 CENTRALSAN 1 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 27 of 42 Page 17 of 29 SUMMARY OF KEY FINDINGS AND RECOMMENDED IMPROVEMENTS 1. Electrical Power Distribution & Motor Control Centers (MCC) 2. Structure 9000 and Forebays 3. Filters 4. Clearwell 5. Disinfection 6. Filter Building Oil � � 3 Key Project Issues: Clearwell: Mechanical, tructural and Failing ElecMcal Equipment;and East Cell Clearwell CWPS Pump Condition and Cover and Liners Sizing Combined Storage and CIz Contact Filter Capacity and Basins Efficacy Condition Electrical Power i Pipeline and Pipe Distribution Voltage Supports Condition and Reliability Water Quality and Hydraulic Bottleneck into Forebays f Electrical Equipment;and AWPS Pump Condition and Sizing 2 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 28 of 42 Page 18 of 29 KEY FINDING #1 : ELECTRICAL POWER DISTRIBUTION • Equipment is at the end of its service life • Medium voltage (2400V) power is outdated, inefficient and unnecessary for the motor sizes needed for current and future demands • System is widely distributed when it could be consolidated and centralized to meet current and future needs T • Condition and improve arc flash potential of electrical gears increase safety risk to electricians - 5 KEY FINDING #1 : MOTOR CONTROL CENTERS • Equipment is at the end of its servicelife • MCCs for Filter Plant are outdated and - W i parts are no longer available from =� r original equipment manufacturer - - • MCCs for PS are outdoors and - - unprotected, reducing reliability and ^ �1 making maintenance difficult in inclement weather • Medium voltage (2400V) power is outdated, inefficient and unnecessary for the motor sizes needed for current and future demands +� • Arc flash protection is a significant } concern that must be remedied 0 CENTRAL SAN a,- - 3 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 29 of 42 Page 19 of 29 IMPROVEMENT #1: PROPOSED ELECTRICAL UPGRADES Electrical Upgrades Upgrade/Replace Electrical Gear at CWPS- • Replace 2,400V Motors with 480V • Add one UW Pump • Replace Substation 40 Replace electrical West East conductors CW CW • Replace Filter MCCs • New AW Electrical Feed Retire Existing Electrical WPS 1103111VIRT-11M,M, KEY FINDING #2: STRUCTURE 9000 AND FOREBAYS Structure 9000: • Significant seismic deficiencies of structure Forebays: • Requires throttling of plant effluent pipeline under low flow conditions which carries some inherent risk • Not needed for applied water flow equalization .A- • Degrades applied water quality through algae growth and water fowl contamination 8 CENTRALSAN 4 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 30 of 42 Page 20 of 29 Improvement #2: Decouple Forebays and Install a New AWPS and Associated Electrical Upgrades ' CWPS UW ��s��•��=�h__._�__�__{ Zone 1RW� 1 '1 1 BW New AWPS 1 i 1 Clea wells Sub 40 i Decouple Filter ❑ Forebays and 1 Abandoned Chem Old AWPSFE Pipeline �-- FDS(Structure 9000) P AWPS �' �� Plant Outfall (Secondary Effluent) Structura Forebays Improvements ' Re wired 9 9401flifflyff,M, Improvement #2: Decouple Forebays and Install a New AWPS and Associated Electrical Upgrades i" :Js oCleatwells i New AWPS Vii?.'; •�� alters l • it:.'i � Decouple Forebays and Abandoned Old AWPSPdrebays �, Structural - •AWPS Improvements r 4" _ y +_: Required to Structure 9000 10 5 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 31 of 42 Page 21 of 29 KEY FINDING #3: FILTERS - • Production capacity is limited • Filter media and underdrains need rehabilitation • Filter underdrain design is outdated and subject to upsets of the gravel layer which must be rebuilt to correct _ • High solids loading produces short-filter runs requiring frequent backwashes and limits production capacity • Filter effluent piping and control valves are undersized for anticipated RW demand • Future demands will not be served with batch operation.Will require continuous operation and better automation and control CENTRAL SAN IMPROVEMENT #3: FILTERS RECOMMENDED IMPROVEMENTS • Recommend new underdrains without gravel • Recommend new Filter media • Only two filters need rehabilitation to meet Phase A capacity • Rehabilitate two other filters for — Phase B � • Replace control valves and piping !mill • Upgrade chemical conditioning • Improve supervisory control and data acquisition (SCADA) and automation ,2 CENTRALSAN a,- - 6 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 32 of 42 Page 22 of 29 KEY FINDING #4: CLEARWELL • Clearwell cover and liner leaking • Single cell operational: Maintenance _-- — -- very difficult • Seismic deficiencies for center divider wall • Liner and cover are at the end of their useful lives • No redundancy to allow shutdown for cleaning, maintenance and repairs - • Floating cover is a continuous maintenance 13 CENTRAL SAN IMPROVEMENT#4: CLEARWELL RECOMMENDED IMPROVEMENTS • Recommend replacement of liners (both east and west cells with a new liner) • Dewater, clean, and dispose solids in East Cell Gt-- • Install a new cover on the East Cell • Replace or repair gates and actuators to allow for operations of both cells • Divider Wall and Overflow Structure Structural Improvements • Filter Effluent Pipeline Improvements • Construct 1 million gallon Steel Storage Tank ' 14 7 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 33 of 42 Page 23 of 29 KEY FINDING #5: DISINFECTION • Variable volume complicates CT compliance and monitoring • Without a fixed volume for CT, the operation is inefficient • No redundant facilities available to facilitate shut down for maintenance and repair • Effective contact time is 4% of Clearwell volume due to short-circuiting • Varying volume of Clearwell incompatible with fixed volume desired for disinfection • Membrane cover over Clearwell prevents access for inspection, cleaning, and service 151 IMPROVEMENT #5: DISINFECTION RECOMMENDED IMPROVEMENTS • Decouple disinfection from Clearwell Storage • Dedicated Chlorine Contact Basin sic! (CCB) recommended in CWMP • CCB more cost effective than UV disinfection • Recommend dedicated CCB within RWP site • Two CCBs in Phase A• Two Additional CCBs in Phase B - _" �. ,6 8 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 34 of 42 Page 24 of 29 KEY FINDING #6: FILTER BUILDING • Update building to current standards and building codes: Structural, Lighting, Plumbing and HVAC • Some hazardous materials (lead and asbestos) abatement Improvement#6: Implement Recommended Improvements to Filter Building PROJECT PRIORITIZATION AND PHASING ,a 9 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 35 of 42 Page 25 of 29 INITIAL PHASED PROJECT APPROACH Phase 1: (Estimated at$53 M) • Replace electrical service and distribution (2,400V to 480V) • Rehab Filter Diversion Structure (or Provide an alternative new Structure) • New AWPS (decouple Forebay, eliminate throttling) • Filter rehabilitation (two out of four minimum) • Upgrade chemical conditioning • Upgrade Filter controls • Perform Clearwell (East and West) Recommended Improvements • Chlorine Contact Basins (two out of four) Phase 2: When CCRP: (Estimated at$35 M) • Provide booster pumps and additional storage for CCRP project on site, if needed • Upgrade remaining two filters • Chlorine Contact Basins (two additional CCBs) is PROPOSED PHASE RECYCLED WATER PLANT FACILITIES IMPROVEMENTS • Add UW Pump I • Replace BW Motors(480V) • New 1 MG Storage Tank • Clearwell: • Rehab East Clearwell • Seismic Pining of divider wall - ° - • New Isolation Gates Chlorine Contact Basins (CCBs) W . • Rehab two Filters „I - • Upgrade Chemical Feed • New AWPS(Decouples Forebays) - - Retire Forebays Upgrade/Replace Electrical Retire Existing AWP Gear • New CW Electrical Facility c •` Replace Substation 40 • Rehab FDS(Structure 9000) New Filter MCCs �. New AWPS Electrical Facility f 20 10 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 36 of 42 Page 26 of 29 TOTAL PROJECT COST (PHASE 1 Project Cost Est. Implementation Items Description (In Millions-2019) 1 Electrical Upgrades $ 8.70 Hydraulic Improvements 2 AWPS $ 9.40 3 Filter Improvements $ 5.50 4 Clearwell Improvements $ 7.70 5 Disinfection Improvements $ 8.50 6 Filter Building Rehabilitation$ 1.00 Subtotal Phase A $ 40.80 Other Project Cost $ 12.00 Total Project Cost $ 52.80 21 PROPOSED FUTURE PHASE 2 RECYCLED WATER PLANT FACILITIES IMPROVEMENTS • Add Booster Pumps .� For CCRP Add Chlorine Contact Ba ins (CCBs) Rehab Remaining Filters !E:i2�dEf, �ii'>'Vfl:I S. iKs � New Electrical Gears for CCRP Booster Pumps • Upgrade Substation 40 • New Filter MCCs ` 22 CENTRAL SAN— _. 11 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 37 of 42 Page 27 of 29 FUTURE PHASE 1 B RECYCLED WATER PLANT FACILITIES IMPROVEMENTS ump F Motors(480V) Storage Tank ab East Clearwell xagon Floats as st CW) • Seismic Pining of divider wall • New Isolation Gates West East Chlorine Contact Basins / CW CW (CCBs) I • Rehab Filters R� Upgrade Chemical Feed — • New AW PS(Decouples �. Forebays) - _ Upgrade/Replace Electrical • Retire Forebays �_ Gear • Retire Existing AW PS _- New CW Electrical Facility Replace Substation 40 • New Filter MCCs • Rehab FDS(Structure 9000)/ New AWPS Electrical Facility 23 REW CAPACITY DEMAND ANALYSIS 12 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 38 of 42 Page 28 of 29 PLANNING FOR THE FUTURE SHORT-AND LONG-TERM RECYCLED WATER DEMAND ANALYSIS With Water Exch.(34 MGD) 30 ReW with Nutrient Removal and Lower TDS for Refineries 20 Phase B (19 MGD) (D Future Peak 11.6-14.4 MGD Daily Q 10 3.8-7.1 MGD .11 [Plant and Zone I 0 Base Load with Concord with Water Demand Community Exchange Future Peak Reuse Project Project Daily Q (CGRP) 25 4%ffihis Recycled Water Demands vrathon O I I IAA = 19 MG Total Recycled a p Water Delivery MM= 22 MGD Shell MD= 25 MGD I I -Lower Total I I Demands are based on 2009 Dissolved L — — — — — i study Solids Facility sized for 19 MGD AA -Lower but could deliver up to 25 Ammonia MGD if available • There is insufficient supply to meet peak demands under Notes: rd MD peaking factors are assumed current conditions nd based on 2009 report by Paul Puckorius 26 AM V 13 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 39 of 42 Page 29 of 29 PLANNING FOR WATER EXCHANGE PROPOSED FACILITIES DOESN'T DIRECTLY IMPACT THE FILTER AND CLEARWELL IMPROVEMENT PROJECT s .I Y -14A ' •} �r. J SIN• I � yyFF 27 `nSr CENTRALSAN 14 April 16, 2019 EOPS Regular Committee Meeting Agenda Packet- Page 40 of 42