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Home My WebLink About08.a. Attachment 3 - CWMP Executive Summary for community outreach ATTACHMENT 3 F{. E N T RA L SA IN gyp 70 YEARS AND B EYO N D _ PROTECTING OUR COMMUNITY AND THE ENVIRONMENT L4W'W ince 1946,Central Contra Costa Sanitary District(Central San)has provided safe and reliable wastewater collection and treatment for residents in central Contra Costa County.Today we rr serve over 481,600 residents and 3,000 businesses in 147 square miles.Our services include supplying recycled water for parks and golf courses,providing both commercial and residential recycled water pickup programs,operating a household hazardous waste collection facility and running a sophisticated water quality laboratory.Our core mission is to protect public health and the environment,and our customers can count on us for vital services 24 hours a day,every day. Central San's infrastructure includes a 1,500-mile collection system and a treatment plant that have been well maintained,but due to their advanced ages,now require replacements and upgrades.Already,the equipment at the ice , a plant and in the system have been extended well beyond their typical useful life due to responsible and robust - - maintenanceractices. Some of the collections system - p y � facilities are over 100 years old,and many are over 50 years old.The treatment plant facilities were primarily constructed ' in the 1970s and some are now at the point where maintenance alone cannot maintain reliable performance. These recommended extensive replacement and upgrade projects will provide for continued reliable operation. In order to plan for the future and lay out a 20-year vision for the replacements and upgrades, Central "Centralcommi _,to being San commissioned a Comprehensive Wastewater environmental _ , , ,we are using the Master Plan (CWMP).The CWMP encompasses latest and most cost-effective technology a $1.8 billion (2016 dollars),two-decade-long optimize our facilitiesand address the drivers capital improvement program (CIP)for the •u r wastewate r m aste r•I.n. �J collection system and treatment plant,with —Roger Bailey, General $873 million of capital improvements within the first ten years. The recommended projects from the CWMP were separated into four programs including the recycled • 4y water system,treatment plant, collection system and general improvements. It also identifies potentially needed improvements for anticipated or pending �� - regulations, but funding for these is not included in the Cl P. We value the input we receive from our customers. Based on focus groups and a customer survey completed in fall 2015, customers are satisfied with Central San's wastewater services and are supportive of recycled water. The majority of customers surveyed (87 percent)supported the master plan and the funding needed to implement replacements and upgrades to Central San's infrastructure. r t Our objectives, as identified in the CWMP, are to: • Preserve,maintain,or replace Central San's assets for -------------------- P LI .= the collection system and treatment facilities. Maximize ------------------ ing Spin Out A SESSInfrastructures ---- Immediate � • Meet increasingly stringent federal,state,and Bay Area 11-Condition Projects 2.Capacity � regulatory requirements for effluent discharges,solids :3.Reliability - disposal and air emissions. IDENTIFY �A,�;S{ �F�I�I�ITi�� l_c�n�Term • Accommodate planned growth in the service area,as - � , , CIP identified by cities and unincorporated Contra Costa County. TRATE K E 1_Segulslions • Achieve sustainability goals by optimizing energy production Refine3.Nee ds and use,while minimizing greenhouse gas emissions. pp ' POLICY Innovation/ • Increase recycled water production for current customers, Leadership the Concord Community Reuse Project development (at the Concord Naval Weapons Station site), and potentially for neighboring industrial customers. Key "Drivers" for Long-Term Planning Aging infrastructure. Repair or replace some equipment and structures to extend their useful lives. •� Capacity. Expand the capacity and redundancy (flows and loads) of some equipment and facilities. *Capacity projects are not intended to address or facilitate population growth. Regulations. Comply with regulations now and continue to adhere to them as they evolve or become stricter in the future. Sustainability/Optimization. Optimize existing treatment processes, energy-efficient improvements, recovery of resources from solids processes, production of recycled water for refineries and improvements for service reliability during possible seismic and flooding events. REGULATORY OVERVIEW AREA POPULATION GROWTH Based on projections developed by the Association of Bay Area Governments (ABAG), L L•L•.L•L•L• °1.L.. the population of Central San's --� 111•-YY Y 1...:.: - service area will continue to steadily increase 7 over the next 20 years at an average rate 71..1..111 of less than 1 percent per year. Our facility 0 111 111 improvements will include both capacity 701 1pLL•L and infrastructure upgrades to account for -11:. additional wastewater and wet weather 425.- flows. Wet weather improvements are needed regardless of population growth to Y L•,Y1111 2M) 2015 202-D 2025 21310 20F5 provide reliable collection and treatment of wastewater through severe storms. 2 REGULATORY NEEDS AND RECOMMENDATIONS Current and future regulations surrounding water Regulatory Considerations quality,solids management and air emissions were Nutrient limitations and constituents of emerging concern key drivers for the development of the CWMP and are not part of any existing regulations, but Central San the projects included. Funding has been allocated to is working with other agencies and regulators to review help Central San address many of these regulations. the science and perform the studies needed to determine Solids Management whether or not additional treatment processes will be needed Central San's approach to solids management continues to in the future. For now,we are taking them into consideration meet all regulations.We will invest in upgrading our existing as we invest in replacing our aging infrastructure.This way facilities to extend their useful life. However,the projections we can responsibly plan for enough space to accommodate of future solid loads is higher than the permitted limit of the those technologies and to make sure we can meet future Multiple Hearth Furnaces(MHFs)where solids are currently need in a cost effective manner. Potential regulations would incinerated and transformed into energy used by the treatment require improvements, and the CWMP has made important plant.Therefore,we are investing in diversifying our solids assumptions on our approach to meet them. However, handling and resource recovery options.This will ensure we the cost will not be included in the 20-year CIP until these continue to provide reliable solids handling and responsibly regulations become more clear and certain. recover valuable resources embedded in the solids such as Nutrient Limitations energy or nutrients.This includes replacing the MHFs with Nutrient reduction in wastewater may be a future anaerobic digestion and newer incineration technology. regulatory requirement, and we are prepared to meet it. Central San is actively engaged with the Bay Area Clean Water Agencies, San Francisco Estuary Institute, and _ have made it - priority to plan forSan Francisco Bay Regional Water Quality Control Board regulations • ensure that Central • to study the role of nutrients in the Bay and to plan for rightthe - - for our • - now • potential nutrient reduction levels and the timing for those in the future." nutrient limits. Petit, • ofEngineering and Technical Services Constituents of Emerging Concern Central San is also engaged in research on the increasing levels of microconstituents and other constituents of emerging concern (CECs)that end up in wastewater from Air Emissions personal care products, herbicides and pesticide use, and To meet several current air emissions regulations and other consumer products.The impact of these constituents anticipated future changes in regulations,we are investing could result in new regulations in the future.While the scope in modern, more efficient air pollution control equipment, and timing of these regulations are currently uncertain,space updating Central San's treatment plant Health Risk at the site has been reserved to accommodate a future Assessment(HRA), and investigating additional technologies CEC treatment system, if required. Future increased levels that may be required in the future. of treatment may be required as the levels and impacts of chemicals are better understood from emerging research. LONG-TERM PLANNING Seismic events In order to prevent any potential long-term disruption of service, there will be further seismic evaluation of major mechanical and electrical equipment throughout the treatment plant and in the utility tunnels. Several seismic retrofit projects for major buildings have been completed, are underway, and are in the Cl P over the next 10 years. Sea Level Rise Protection Since Central San's service area is primarily inland,sea level rise protection is not a major issue,but it is still an important consideration for some of the facilities.The California Department of Water Resources'standard is to provide protection against a 200-year water level with 3 feet of freeboard,and include allowances for sea level rise due to climate change.Central San has joined with the Contra Costa County Flood Control District to implement a project to raise the levees along Grayson and Walnut Creeks to provide three feet of freeboard,which will protect the site from a 500-year storm event. 3 RECYCLED WATER SYSTEM EVALUATION Some of the existing Recycled Water Plant • Expand disinfection capacity through the addition of a infrastructure is nearing the end of its useful life. IQ chlorine contact basin. In addition, a higher recycled water production . Optimize chemical use and increase the capacity of the capacity will be needed to satisfy the demands chemical support systems. for the Concord Community Reuse Project development and for potential future in-plant ® RECYCLED WATERTREATMENTALTERNATIVES utility water demands.The plant has been in evaluated to identify improvements needed to Central San developed a short list of viable technologies that extend the life of the facilities for at least the next 20 years were combined to form overall treatment alternatives for and to meet recycled water demands through 2035. meeting future nutrient regulations and producing recycled water for area refineries.The top three liquids alternatives were Infrastructure Improvements: evaluated and selected during a workshop with staff comprised • Replace water pumps,flow meters,filter media,the of operations,maintenance and engineering personnel. Clearwell liner and cover used to store recycled water, and other controls to help the system operate more efficiently. ACHIEVING ZERoDISCHARGE • Upgrade or replace the electrical support system for the One of Central San's long-term goals is to achieve zero liquid recycled water,filtration and applied water process areas. discharge to Suisun Bay during the dry weather season.To • Replace components of the chemical support systems reach this goal,we are working to maximize the production (sodium hypochlorite and coagulant). and use of recycled water by evaluating wholesale recycled water opportunities.There are a number of neighboring water Capacity Improvements: agencies that could serve as potential recycled water wholesale • Optimize filtration performance and capacity by improving customers in the future. water filterability with a filtration pretreatment process. M i f A Vtlk C { � �' .r "'Si.4!S � � a.��;fly �L ; J 7 .t}` "' � �..•1R.j . P r � u•R. r• � L K s � - a ss 4 Addressing Limitations of Existing Recycled Water System ................... ..r......................... f` ............................... Community Impacts and Rates .................................... " . ........................................... .......... Planning for Future Incinerator , Nutrient Removalmpli :Emission Compliance Opportunities/ Costs for Future .; #+�► ` ✓�,� Recycled Water, .......... Future Ene rgy Changing Conditions Including ZeroBalance with N1 -Regulations Discharge -- �,�` ►`" j'� r __ Reduced Landfill Gas -Water Demands �. ......................... Climate Change .......................... .. ............................... ............... - ................................................. ............ `. Hydraulic Capacity and Cost and O&M for Optimization of Reliability for Wet Weather .....................................................: Disinfection .......................................: Dry and Wet .................................... .. . �_ Flow Projections :Opportunities ............................... for Innovation and Resource Recovery Realistic Costs for Prioritized Rehab/ CIP Development ': Replacement . :.............................. Schedule to Address ': :Reliability of Aging Infrastructure Pump Stations THE REATM E NT PLANT SYSTEM Central San's treatment plant is located in Martinez, and it processes approximately 32 million gallons of wastewater each day during the dry season and can see peak flows as high as an estimated 230 million gallons per day during an extreme winter storm.The treatment plant is a conventional air-activated sludge facility that provides primary and secondary treatment of the influent wastewater.The secondary effluent is disinfected using UV lamp technology and the final treated effluent is then conveyed by an outfall pipeline to Suisun Bay. Solids removed by the primary and secondary treatment processes are sent to Multiple Hearth Furnaces(MHFs).The MHFs reduce the solids to ash,which is beneficially reused as a fertilizer amendment by a third party.The energy embedded in the solids is recovered to offset Central San's energy use as waste heat from the furnaces and then converted to steam energy that is used to drive steam turbines,which in turn, drive the aeration blowers that supply air for the activated sludge biological process. TREATMENT PLANTAsSESSMENT The treatment plant system contains over 4,200 assets that need to be maintained and monitored for efficient operation.Through site inspections,condition assessments and workshops with Central San's operations and maintenance staff,several aging assets have been identified for replacement or upgrades to more reliable,efficient and modern systems.The plant was primarily built in the late 1970s,and modernizing it will include investing in new technology and addressing increased energy and power demands. To ensure long-term reliability and efficiency, our assessment has concluded: • It is not necessary to build a new treatment plant.The plant has a solid foundation and will require primarily mechanical, electrical, and instrumentation improvements to address aging assets that are in poor condition, are unreliable, or are increasingly costly to maintain. • New solids/energy projects will be developed to ensure Central San is providing reliable solids handling facilities and is investing in sustainable solutions while reducing its energy footprint and general operation and maintenance costs. • The UV system will be replaced with a new one that is more energy efficient.The current system is 20 years old, is inefficient compared to modern systems, and some of the electrical support infrastructure is becoming increasingly unreliable. • Improved instrumentation and power monitoring is recommended to help identify other opportunities to reduce energy demands and other operating and maintenance costs. 5 TREATMENT PLANT AGING INFRASTRUCTURE • CAPACITY 1 Filter Plant Improvements:Replace filter media,underdrains,electrical gear,and support 1 Filter Plant Expansion:Add a chlorine contact tank,expand support facilities. equipment.Add filter pretreatment upstream of the filters to meet 2 Secondary Clarifier Rehabilitation:Replace clarifier mechanisms and sludge pumps. Concord Community Reuse Project Title 22 recycled water demands 3 UV Replacement:Replace ultraviolet disinfection system. when they occur. 4 Solids Handling Improvements:Replace centrifuges,cake pumps,and air pollution control 7 Secondary Treatment Hydraulics:Add secondary clarifiers to increase equipment. PHWWF capacity and a mixed liquor splitter structure to evenly split between clarifiers. 5 Fluidized Bed Incinerator:Replace Multiple Hearth Furnaces(MHFs)at the end of their useful g UV Hydraulics:Add low lift pumps to UV channel and a parallel final life with a fluidized bed incinerator. effluent pipe. 6 Clearwell Improvements:Replace clearwell liner and the east cell cover;add west cell cover. g primary Expansion:Add two primary sedimentation tanks and a pre- Outfall Improvements aeration tank to reduce surface overflow rates and improve performance. Odor Control Upgrades ■ 19 18 - tea" "`` ^• _y ;t 1 V 12 16 16 11 1 Now - ^ _fir`a � '► .., -tea 1•�! i 16 VOL Not Central San - - - Property IL A ALI 14 r 4 r - o 'V' Fin isjr ..1 sw - 6 6 _+ . PROJECTSOVERVIEW (0 REGULATORY SUSTAINABILITY 4 Solids Handling Improvements:Reduce lime addition,replace air pollution control 13 Screenings Removal Upgrade:Add new influent screenings removal and equipment and ash handling,implement seismic upgrades for the Solids Conditioning handling facilities to replace the current screenings handling process. Building and MHFs, and improve the sludge blend tank storage operations and mixing. 14 Aeration System Upgrade:Replace steam blowers with electric blowers,replace 5 Solids Handling Upgrades:Add digesters to reduce the load to the furnaces to prevent ceramic diffusers with membrane diffusers,replace air piping.Convert waste heat exceeding the MHF permitted capacity,and eventual replacement of the MHFs with recovery steam system into a waste heat to power production system. digesters followed by a fluidized bed incinerator. 15 Raw Wastewater Diversion and Drain-back System:Add a raw wastewater 10 Contaminated Soils:Re-consolidate contaminated soils to wet weather holding basin pipeline to the wet weather holding basins and a pump station to reliably A-South. drain back wastewater from the holding basins. 11 BACWA level 1:Optimize facilities for nutrient reduction by adding chemically enhanced 16 Refinery Recycled Water Project(20 mgd):Add membrane bioreactors(MBR), primary treatment and implementing aeration tank modifications for split flow nitrification. Reverse Osmosis(RO),and UV to produce recycled water for nearby refineries.* 11 BACWA Level 2/3:Implement nutrient removal upgrades to reduce ammonia, 11 HSW Receiving facility:Add high strength waste(HSW)receiving facility with nitrogen,and phosphorus to the anticipated limits.* digestion to increase biogas production. 12 CEC Removal:Provide space on the existing plant site for future facilities to remove 18 Renewable Energy Project:Solar or wind.* Constituents of Emerging Concern(CECs).* 19 Flood Protection:Raise the levee to protect from a 500-year storm event,and replace the motors for the influent pumps with"immersible"motors.Add sixth influent pump for wet weather flows. Seismic Upgrades Potential project identified but not included in the CIP. --- -- 19 15 Nib 18 -� w X10 .� 11 17 11 10 14 15 01011F W. - `` f`� -• - -_ t'�C X11 - —- ''�'y - ® - - � .'` ''ems!- ,, -•. ` t - T THE O LLECTI O N SYSTEM Central San's collection system has over 1,500 miles of gravity sewer pipes, 19 pump stations,22.8 miles of force mains(pressurized pipes), and roughly 35,000 manholes. Our collection system serves Alamo, Blackhawk, Clyde, Danville, Diablo, Lafayette, Martinez, Moraga,Orinda, Pacheco, Pleasant Hill, Fairview Rossmoor, San Ramon, and Walnut Creek. Clyde o nezt. - Maltby In addition to these communities,Central San -- � Concord Industrial also provides wastewater treatment for the City of Concord and Town of Clayton. Martinez ,/I Buchanan North/South ? � COLLECTION SYSTEM ASSESSMENT 0 Concord AND INNOVATION To better understand existing flow and pipeline �'a R°b'e conditions and to prepare for future infrastructure Slee Hallow 2� ° pY Wagner Ranch needs related to the collection system,Central Bates Blvd. San is utilizing the following state-of-the art tools: Hca°'aLISI Lfaye e 8 • A new hydraulic modeling tool (InfoWorks®) to predict flows(including during rain events) FEELower Orinda Flush Kleen in the collection system, evaluate the impacts OrindaP of new or changing flows on existing pipes, ..- and to ensure pipes are sized adequately. Orinda Crossroads I ,f • A new capital planning tool (InfoMaster®)to Moraga prioritize pipeline replacements.With a system 4 that includes 1,500 miles of pipelines,this predictive tool is used to identify which pipes to 4 replace,and when and how many pipes will be replaced over the next 100 years. • A new CityWorks®computerized LEGEND maintenance management system (CMMS) SanRamon \ San Ramon t Staions and closed circuit television (CCTV) pipe Pump \_I-< inspection software used to help manage Collection System collection system cleaning, inspection, and condition information. Also,condition assessments for the pump Map of the existing collection system stations helped to determine priority level for upgrades moving forward. TH E FUTURE OF THE COLLECTION SYSTEM The new projects to upgrade and improve the collection system address the master planning drivers and greatly benefit Central San's customers.Our Capital Improvement Program(CIP) includes gravity sewer wet weather capacity relief improvements to 12 areas throughout the service area within the next 10 years and another 8 areas within the next 10 to 20 years. No improvements were needed for existing pipelines to accommodate planned growth in the service area.An extension of the existing collection system and some improvements to pump stations may be required in North Concord to accommodate future flows from the Concord Community Reuse Development; however,those project costs are not included in the CIP.The CIP also includes improvements to gravity sewers and pump stations to extend their useful lives. 8 COLLECTION SYSTEM PRO ECTS OVERVIEW . . O GRAVITY SEWERS ~` G •• PUMP STATIONS w a 3 a �ry _ 1 , Gravity Sewers-80 miles of sewer will be replaced in - Pump Stations-Several improvements to the pump the next 10 years and another 184 miles will be replaced MARTINEZ ,� stations are required over the next five years.The largest within the next 10 to 20 years. projects are the rehabilitation of the Fairview,Maltby, Martinez,Moraga,and Orinda Crossroads pump stations. :. These four projects represent approximately 95%of the 30-35 million in pump station repairs. ,r='• L� —�`— �—` L PLEASANT HILL — CONCORD • CLAYTON e .. � i r a; — _ — " •� - — - WALNUT CREEK 24 LAFAYETTE ORINDA ' ,Y -man LLN ALAMO i MORAGA DIABLO DANVILLE CENTRAL SAN SERVICE AREA • GRAVITY SEWERS �• PUMP STATIONS ic ■WASTEWATER COLLECTION Sz r "k 3 SAN RAMON TREATMENT AND HOUSEHOLD - HAZARDOUS WASTE(HHW)SERVICES _ - PROVIDED ■WASTEWATER TREATMENT AND HHW SERVICES BY CONTRACT .. HHW SERVICES ONLY .` LI . CENTRAL SAN HEAD s QUARTERS • BUILDING,TREATMENT PLANT&HHW FACILITY COLLECTION SYSTEMS OPERATIONS FACILITY r 1r -- pra- ?. 4 T TH E COLLECTION SYSTEM (Continued) In an effort to continually improve service reliability, CCTV inspections have been successful and will continue to Central San is working to reduce sanitary sewer overflows(SSOs) be used on over 150 miles of pipeline per year.We will also for the collection system.We are addressing this through pipe- be investing more in the inspection of large diameter pipes line cleaning,inspection and renovation.We are currently replac- that are costly to repair or replace and force mains,which are ing less than 0.5 percent per year of our total owned pipelines difficult to take out of service. and plan to increase toward one percent per year over the next However, sometimes cleaning is more cost effective than ten years,focusing on the highest risk pipelines. replacing a pipe.We will continue our maintenance practice of cleaning over 800 miles of pipe per year. 1 00-YEAR SEWER REHABILITATION & REPLACEMENT FORECAST Period cost ($M) Milea e 0-5 Years $99 5-10 Years 180 42 10-20 Years $441 184 0- 0 Years 4 281 30-50 Years $1,156 403 6OoWO*OW 50-75 Years $575 206 _S , ,0 U 75-100 Years $808 276 7j 40;.00OJODD .E U 30;.000;000 . ; 000 10000Q000 Forecast Year 10 CAPITAL IMPROVEMENT PLAN The Comprehensive Wastewater Master Plan encompasses a$1.8 billion (2016 dollars)20-year capital improvement program (CIP)for the collection system and treatment plant,with$873 million of capital improvements within the first ten years.These short-term and long-term investments in our systems align with our mission to always protect public health and the environment and maintain the excellent service levels our customers expect from Central San. $120,000,000 $100,000,000 $80,000,000 $60,000,000 $40,000,000 $20,000,000 $0 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 Treatment Plant Collection System Recycled Water General Improvements 1 O-YEAR CIP 2OYEAR CIP General Improvements General Improvements $2910241000 $5417241000 Recycled Water Contingency Recycled Water Contingency $2418731000 $1910001000 $2611231000 $3910001000 Collection System Treatment Plant Collection System Treatment Plant $35312491000 $44615071000 $82614481000 $85711791000 Total 10-year CIS°° $872,653,000 Total 20-year CIP $1,803,474,000 INNOVATION FOR THE FUTURE The CWMP has identified proven technologies that can be utilized to meet future nutrient limits,wholesale recycled water needs and technologies for solids handling and resource recovery.These technologies are essential for ensuring Central San has a plan in place if we need to replace those systems. However,we recognize the industry is rapidly changing and that emerging and innovative technologies may offer improved life cycle costs and/or reduced footprint requirements,so we are also investing in applied research to continue to explore the best available options for Central San. r .000m— � .... ...its lot 4 _TAW k* r 4 f �q _J M1IIII IIIN't T 1 L, �4r Y r, G i Central Contra Costa Sanitary District Protecting Public Healthand the Environment 12