Charleston Water System Capital Improvements Program Annual Report

Transcription

1 Charleston Water System Capital Improvements Program Annual Report 2016

2 CHARLESTON WATER SYSTEM CAPITAL IMPROVEMENTS PROGRAM ANNUAL REPORT 2016 Mark Cline, P.E., Capital Projects Officer December 2016

3 Table of Contents Table of Contents I. Introduction and Executive Summary II. III. IV. Financial Information Conclusion V. Project Location Map 1 P age

4 Introduction and Executive Summary I. Introduction and Executive Summary The Charleston Water System s 2010 Capital Improvements Program together with the Charleston Water System s 2014 Capital Improvements Program (collectively the CIP) consists of master plan improvements and expansions to water and wastewater infrastructure for the years 2011 through Each of the plans constituting the CIP was developed by the staff of the Commissioners based upon long-term master planning undertaken by the staff and consulting engineers, and were adopted by the Commissioners in 2010 and 2014, respectively. The CIP was designed not only to accommodate projected growth within the service area, but from an asset management perspective to also include substantial funds for rehabilitation and replacement of aging infrastructure. It further includes project funding to help meet an increasing number of utility relocation needs resulting from SCDOT and County road improvements projects. The construction schedule for the various improvements included in the CIP was determined on the basis of relative need and importance of each such improvement, the time required for planning and design work, and the extent to which modifications can be effected on existing facilities. The CIP is financed out of proceeds of the Series 2010 Bonds and the Series 2015 Bonds, as well as from current and future revenues and funds of Charleston Water System. A. Water System The CIP addresses the immediate needs of both the Hanahan Water Treatment Plant and the water distribution system through 2018, and includes projects associated with growth, roadway improvements, and infrastructure replacement and rehabilitation. Planned major improvements to the water utility include rehabilitation of twenty filters along with other miscellaneous improvements, replacement of a 1904 sedimentation basin, water plant residuals handling improvements for greater efficiency and capacity, a 5 million gallon ground storage tank and booster pumping facility, replacement of an abandoned subaqueous water main crossing the Ashley River to help meet growth and fire flow demands in retail and wholesale service areas, replacement or rehabilitation of aging water mains, main extensions to serve growth in the Cainhoy area, and various water infrastructure relocation needs associated with road improvements throughout the retail water service area. The Charleston Water System must continue to make improvements to the Hanahan Water Treatment Plant and to the water distribution system to ensure available capacity to meet water demands associated with growth and fire protection, as well as to comply with increasing regulatory requirements and to replace aging infrastructure. Proceeds of the Series 2010 Bonds and Series 2015 Bonds, as well as cash in the total approximate amount of $69,650,000 are being used to finance the ongoing water treatment plant improvements included in the CIP. As generally described above, the projects at the Hanahan Water Treatment Plant include rehabilitation of twenty filters representing 92 million gallons per day of water filtration capacity at the Stoney Filter Building, replacement of a 1904 sedimentation basin, and residuals handling improvements for 2 P age

5 Introduction and Executive Summary greater efficiency and capacity. The filter rehabilitation project will include upgrades to filter control valves, as well as upgrades to the building electrical system, dehumidification system, and heating and ventilation systems. The sedimentation basin project includes three high-rate inclined plate settlers with integrated flocculation cells, inlet and outlet flow distribution structures, raw and finished water piping, and ancillary chemical feed and electrical infrastructure. In 2013, engineering consultants in conjunction with Commission engineers updated the comprehensive 20-year master plan prepared in That master plan addresses adequacy of existing water supply and treatment facilities to meet projected future demands associated with growth through 2035 and proposed treatment goals of anticipated drinking water quality regulations. The master plan evaluates process alternatives and incorporates recommended improvements into a phased construction program, the schedule for which provides the basis of the plan of finance contained in the CIP. Proceeds of the Series 2010 Bonds and Series 2015 Bonds, as well as cash in the total approximate amount of $73,155,000 are being used to finance the ongoing water distribution system improvements included in the CIP. As generally described above, the major projects include installation of approximately 15,000 feet of 36-inch water transmission main to replace a 24-inch subaqueous water main abandoned due to deterioration (Ashley River), a 5 million gallon ground storage tank and booster pump station (Bees Ferry Road), system expansion in the Hollywood, Ravenel and Cainhoy areas, rehabilitation or replacement of aging water mains in Peninsular Charleston to support growth and fire protection, and relocation of numerous water mains and appurtenances associated with roadway improvements conflicts. In 2006, a comprehensive 20-year master plan of the water distribution system was prepared by engineering consultants in conjunction with Commission engineers. That master plan addresses both rehabilitation of the existing distribution system infrastructure and improvements to meet projected water demands and fire flow requirements associated with future growth through Extensive hydraulic computer modeling of the water distribution system was performed to identify infrastructure needs and develop a phased construction program, the schedule for which provides the basis of the plan of finance contained in the CIP. B. Wastewater System The CIP addresses the immediate needs of both the Plum Island and Daniel Island Wastewater Treatment Plants (WWTP), as well as the wastewater collection system through 2018, and includes projects associated with regulatory compliance, growth, and infrastructure replacement and rehabilitation. Planned improvements to the wastewater utility include replacement of a sewer interceptor tunnel, a new influent pump station, new influent screens and replacement of deteriorated infrastructure at the Plum Island and Daniel Island WWTPs, sewer collection system infrastructure rehabilitation, and relocation of numerous sewer mains and appurtenances associated with roadway improvements conflicts. The Charleston Water System must continue to make improvements to the Plum Island and Daniel Island Wastewater Treatment Plants and to the wastewater collection system, including the deep tunnel interceptors, to ensure available capacity to handle projected wastewater flow and to replace aging infrastructure. 3 P age

6 Introduction and Executive Summary Proceeds of the Series 2015 bond issue, and cash in the total approximate amount of $70,000,000 are being used to finance the ongoing wastewater treatment plant improvements included in the CIP. Generally described above, major projects at the Plum Island WWTP include replacement of the plant headworks and primary clarifiers, as well as addition of an anoxic selector basin and a final clarifier. At the Daniel Island WWTP, additional influent screening and odor control equipment were installed for pretreatment of flow entering the Daniel Island Tunnel. In 2013, engineering consultants in conjunction with Commission engineers updated the comprehensive 20-year master plan prepared in 2005 so that it encompassed a 50-year planning period. That master plan addresses adequacy of existing treatment facilities to meet projected future flows associated with growth through 2060 and proposed treatment goals of future discharge regulations. The master plan evaluates process alternatives and incorporates recommended improvements into a phased construction program, the schedule for which provides the basis of the plan of finance contained in the CIP. Proceeds of the Series 2015 bond issue, and cash in the total approximate amount of $101,520,000 are being used to finance the ongoing wastewater collection system improvements included in the CIP. The major projects include 8,200 feet of deep tunnel interceptor sewer to the Plum Island WWTP with a new influent pump station and force main, the Johns Island Sewer Interceptor Phase 2, the Red Top Interceptor Phase 2, gravity interceptor rehabilitation (Church Creek and Johns Island), system expansion in the Cainhoy area, replacement or rehabilitation of several aging pump stations, and relocation of numerous sewer mains and appurtenances associated with roadway improvements conflicts. In 2006, a comprehensive 20-year master plan of the wastewater collection system was prepared by engineering consultants in conjunction with Commission engineers. That master plan addresses both rehabilitation and replacement of the existing collection system infrastructure and improvements to meet projected wastewater flows associated with future growth through Extensive hydraulic modeling of the wastewater collection system was performed to identify infrastructure needs and develop a phased construction program, the schedule for which provides the basis of the plan of finance contained in the CIP. 4 P age

7 II. As of November 2016, the CIP is comprised of the projects listed in this section. Included for each project are a brief description, the current status, and the anticipated total expenditure from CWS major capital funds. The projects that are planned and in-progress are listed by major operational area (water treatment, water distribution, wastewater treatment, and wastewater collection), and the approximate location of each is depicted by its respective number on the map in Section V of this report. The projects completed during the last calendar year are listed together at the end of this section. Because they are complete, these projects are not shown on the map in Section V. Water Treatment Plant 1. Stoney Filter Rehabilitation: The project involves rehabilitation of 20 filters with new filter bottoms, equipped with air scour capability, and replacement of the granular media. Included is replacement of the filter control valve hydraulic actuators with electric actuators, and improvements to the filter building electrical distribution, dehumidification, heating and ventilation systems. 14 of 20 filters completed to date. Project completion scheduled for June Anticipated Expenditures: $11,300, Stoney Filter Blower Addition: The project involves installation of a stand-by blower and ancillary equipment in the air scour backwash system serving the Stoney Filter Complex. Project completion is scheduled for April Project Status: Bid phase Anticipated Expenditures: $500, Plate Settler Basins Phase 1 and Solids Handling Improvements: The project will serve to improve the sedimentation process efficiency and capacity. The Plate Settler Basin Phase 1 and Solids Handling Improvements Project was identified as a potential candidate for alternative delivery (Construction Manager at Risk) by bundling the recommendations to expedite construction and facilitate integration of new facilities with minimal disruption of plant operations, as well as to maximize the improvements scope within the project budget. The project scope includes three new inclined plate settler basins with integrated flocculation cells replacing Settling Basin 1, which was constructed in Basin 1 suffers from hydraulic short-circuiting and does not have continuous solids removal capability which is a serious problem for plant operation efficiency. The planned capacity of each new plate settler basin is 20 MGD. The addition of the new plate settler basins will increase the plant s total sedimentation capacity up to 139 MGD, providing firm capacity to match with existing filtration capacity. Included with the settling basin improvements are new coagulant and polymer feed equipment and controls; a new raw water flow distribution facility; and raw and settled water conveyance improvements for effective 5 P age

8 Plant hydraulics. Future phases are planned to replace the remaining sedimentation basins as water demands dictate. The project scope also includes improvements to the Plant solids handling facilities and consolidation of post-filtration chemical feed processes. Improvements at the Plant solids handling facility include upgrading the existing backwash decant systems to increase discharge capacity; replacement of the thickener splitter box to evenly distribute flows to the three existing sludge thickeners; replacement of NPDES discharge piping and metering to increase capacity; and enhancements to the thickened solids storage tank for greater cleaning efficiency. Recommended in the 2005 and 2013 HWTP Master Plans, installation of new finished water piping between Clearwell 4 and Clearwell 2 will enable miscellaneous post-filter chemical feed consolidation improvements providing greater efficiency for chemical feed and flexibility of operations. Project completion is scheduled for April Anticipated Expenditures: $51,300, Edisto Intake Improvements: The intake and equipment are original to the 1920 s project to install the Edisto Intake and Tunnel. Replacement of the intake gates and screens is necessary for greater operational control of the raw water source, as well as maintenance of the screens. Project Status: Planning phase Anticipated Expenditures: $2,700, Electrical System Improvements: The project is intended to extend the first phase of new electrical distribution infrastructure from the Plant s new Electrical Distribution and Stand-by Generator Facility. Extension is necessary to provide stand-by power for 100% raw water pumping capacity. Project Status: Planning phase Anticipated Expenditures: $1,250, Lime System Improvements: The project includes retrofitting the existing hydrated lime feed systems to feed liquid lime for operational flexibility and efficiency. Pilot testing by plant staff is ongoing. Project Status: Planning phase Anticipated Expenditures: $2,100, Residuals Sprayfield Drainage Improvements: Project involves restoring a major drainage channel in the decommissioned alum residuals sprayfield. The October 2015 floods washed away a causeway that provided support for a 36-inch water transmission main and emergency access to the Hanahan WTP. The work will include re-establishing the drainage channel and permanent pile supports for the water transmission main to span the channel, and creation of an alternative emergency ingress/egress road for the Hanahan WTP. Project Status: Design phase Anticipated Expenditures: $500,000 6 P age

9 Water Distribution System 8. Ashley River Transmission Main Crossing to Bees Ferry Road Storage Complex: The project involves replacement of an abandoned segment of 24-inch water main crossing the Ashley River just west of I-526 that was removed from service due to its deteriorated condition. The scope of this project is to extend a new 36-inch diameter main from an existing 24-inch water main in North Charleston approximately 17,000 feet to the proposed Bees Ferry Tank site by open cut and horizontal directional drilling beneath the Ashley River. This new segment of 36-inch main will be the first of several phases of transmission main improvements recommended in the master plan to address water demand and fire flow needs, and system reliability in West Ashley. Project completion is scheduled for February Anticipated Expenditures: $19,100, Bees Ferry Road Water Storage Tank Facility: The project consists of one 5.0 million gallon ground storage tank and a booster pump station. Provisions will be made for the installation of an additional 5.0 million gallon ground storage tank in the future pursuant to master plan recommendations. Project goals are to meet the projected water demands and fire protection needs of customers in the West Ashley, Hollywood and Ravenel areas; as well as the water demands of wholesale customers on Johns Island. Project completion is scheduled for March Anticipated Expenditures: $11,800, Harborview Road Water Main Relocations: Project involves relocation of water mains, services and other appurtenances in SCDOT right-of-way to resolve conflicts with roadway infrastructure and drainage improvements. Project completion is scheduled for June Anticipated Expenditures: $2,100, Spring and Fishburne Water Main Relocations: The project involves relocation of water mains, services and other appurtenances in SCDOT right-of-way to resolve conflicts with roadway drainage improvements. Project completion is scheduled for December Anticipated Expenditures: $3,200, Hollywood/Ravenel Water Main Extension Phase 2: The project involves installation of approximately 8,000 linear feet of 16-inch diameter and 6,500 linear feet of 12-inch diameter water main along US Highway 17, Old Jacksonboro Road, and New Road to provide the second leg of a water main to loop the distribution system between Ravenel and Hollywood. In addition, this main will help to provide future water service to an area of high growth identified in our Water Distribution Master Plan. Project completion is scheduled for December P age

10 Anticipated Expenditures: $2,100, Hollywood/Ravenel 16-inch Transmission Main Improvements Phase 3: This project is proposed to complete the water transmission main loop between Hollywood and Ravenel. The project includes approximately 16,000 feet of 16-inch diameter water main along New Road from Highway 162 to Savannah Highway. This will enable distribution of water from the proposed Ravenel ASR and Storage Tank site improving water quality, fire protection, and emergency storage needs in the Hollywood service area. Project Status: Planning phase Anticipated Expenditures: $3,500, Hollywood / Ravenel Elevated Storage Tank Site: The Water Distribution System Master Plan calls for a 1 million gallon elevated water storage tank, and aquifer storage and recovery (ASR) in this part of the CWS service area to meet long range peak water demands and fire protection needs. Surveying and legal work is ongoing with West Rock (formerly DBA Mead Westvaco) regarding a tank site and an ASR site in the proposed East Edisto Business Park southwest of Ravenel. Funding for design and construction phase services for the tank and ASR wells will be requested in a future CIP bond issue when water demand needs dictate. Land acquisition is scheduled for completion by January Project Status: Preliminary design phase Anticipated Land Expenditures: $100, West Ashley Transmission Main Improvements: This project is intended to complete preliminary engineering and to obtain easements for a water transmission main from the Bees Ferry Storage Complex southward to the Croghan ROW connecting with the existing Main Road feed to Johns Island. The approximate project length is 28,000 feet. Final design and construction funding is anticipated in a future bond issue. The basis of design report and easement plats are scheduled for completion by December Project Status: Preliminary design phase Anticipated Expenditures: $1,000, Cainhoy Plantation Water System Phase 1: Charleston Water System has a contractual obligation to provide trunk water systems for portions of the Cainhoy area. This project involves the trunk water system for the first phase of development in Cainhoy Plantation. Project completion is scheduled for April Anticipated Expenditures: $1,400, Armstrong Tract Transmission Main Improvements: This project includes consolidation of three old transmission mains just outside the Hanahan WTP into one 36-inch main. Provides better reliability and accommodates 8 P age

11 extension of a future transmission main from the Hanahan WTP pursuant to the Water Distribution System Master Plan. Project completion is scheduled for May Anticipated Expenditures: $2,600, Cannon and Spring Street Water Main Replacement: The project involves replacement of cast iron water mains, services and other appurtenances in SCDOT right-of-way in association with City s Street-Scape Project in the same corridors. Water main installation is complete with 181 of 586 water services transferred or replaced. Project completion is scheduled for January Anticipated Expenditures: $4,450, Foster Creek Road 24-Inch Transmission Main Phase 1: The project is planned to replace an existing 16-inch prestressed concrete transmission main with a new 24-inch transmission main to provide the necessary capacity to meet the growing potable water and fire protection demands in the Hanahan service area and provide needed redundancy to the Naval Weapons Station. The proposed scope of the first phase will include installation of approximately 3,500 linear of water main under the Goose Creek Reservoir by Horizontal Directional Drill (HDD) and the installation of approximately 1,500 linear feet of 24-inch ductile iron water main by open cut to the intersection of Tanner Ford Boulevard and Foster Creek Road. Additional extension(s) of the water main to the Naval Weapons Station may be done in future phases, the timing of which will be dependent on the status of service area contracts and water demands. Funding for the design and construction phase services will be requested in a future CIP bond issue. Project Status: Preliminary design phase Anticipated Expenditures: $100, Peninsula Water Main Rehabilitation Phase 2 The project includes rehabilitation of approximately 13,850 linear feet of 6-inch through 12-inch cast iron water main along Ashley, Magnolia, Enston, Laurel, King, Francis, Cleveland, Maple, Poplar and San Souci Streets. Rehabilitation will allow CWS to remove tuberculation and line the water mains; restoring them to full operability without the expense and disruption associated with complete water main replacement. Project Status: Design phase Anticipated Expenditures: $2,600, Hanover, Line and South Streets Water Main Replacement Part of a multi-phased project to ultimately replace approximately 16,750 linear feet of 6- inch and 8-inch unlined cast iron water mains, this project phase is proposed to replace approximately 3,150 linear feet of deteriorated water mains located along Hanover, Line, and South streets. Completion of this project will improve fire protection and increase service reliability in these areas. Project Status: Design phase Anticipated Expenditures: $1,800,000 9 P age

12 22. Calhoun Street Water Main Replacement - Elizabeth to Meeting Part of a multi-phased approach to replace the water main in Calhoun Street from Elizabeth Street to Smith Street, this project phase is proposed to replace approximately 960 linear feet of deteriorated 6-inch cast iron water main with a new 12-inch ductile iron main. Completion of this project will improve fire protection and increase service reliability in the stated area. Project Status: Design phase Anticipated Expenditures: $750, Clements Ferry Road Widening Phase 1 Water Utilities Relocation The project includes relocation of water utilities in conflict with planned road improvements associated with the first phase of widening Clements Ferry Road from I-526 to Jack Primus Road. The project will be completed as a subcontract to the SCDOT road improvements contract under an Agreement with SCDOT used to define each party s cost share responsibility as a percentage of the total awarded subcontractor pricing for the water utility relocation portion of the work. Project completion is scheduled for May Anticipated Expenditures: $615, Gainesborough Drive Water Main Relocation The project includes relocation of water utilities in conflict with planned road improvements associated with the Gainesborough Drive Sidewalk and Drainage Project. The project will be completed independently by a CWS contractor prior to the road improvements. Project completion is scheduled for January Anticipated Expenditures: $275, Henry Brown Boulevard Water Main Relocation The project includes relocation of water utilities in conflict with planned road improvements associated with the widening of Henry Brown Boulevard from Redbank Road to Liberty Hall Road. The project will be completed as a subcontract to the SCDOT road improvements contract under an Agreement with SCDOT used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the water utility relocation portion of the work. Project completion is scheduled for December Anticipated Expenditures: $1,125, Port Access Road Water Utilities Relocation The project includes relocation of water utilities in conflict with the planned road improvements associated with the new Port Access Road Project. The project will be completed independently by a CWS contractor prior to the road improvements under an Agreement with SCDOT used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the water utility relocation portion of the work. Project Status: Preliminary design phase Anticipated Expenditures: $7,000, P age

13 27. SC 7 and SC 61 Intersection Improvements Water Relocation The project includes relocation of water utilities in conflict with planned road improvements at the intersection of Highways 7 and 61. The project will be completed as a subcontract to the Charleston County road improvements contract under an Agreement with the County used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the water utility relocation portion of the work. Project completion is scheduled for March Anticipated Expenditures: $560, Folly Road at Camp Road Water Main Relocation The project includes relocation of water utilities in conflict with planned road improvements at the intersection of Camp Road and Folly Road. The project will be completed as a subcontract to the Charleston County road improvements contract under an Agreement with the County used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the water utility relocation portion of the work. Project completion is scheduled for December Anticipated Expenditures: $1,015, Camp and Riverland Intersection Improvements Water Relocation The project includes relocation of water utilities in conflict with planned road improvements at the intersection of Camp Road and Riverland Drive. The project will be completed as a subcontract to the SCDOT road improvements contract under an Agreement with the SCDOT used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the water utility relocation portion of the work. Project Status: Design phase Anticipated Expenditures: $385, Ashley Hall Plantation Road Bridge Improvements Water Utilities Relocation Project involves relocation of water utilities in conflict with Charleston County s planned bridge improvements where Ashley Hall Road crosses Bulls Creek. The project may be completed independently by a CWS contractor prior to the bridge improvements construction. Project Status: Design phase Anticipated Expenditures: $425, Pepperdam and Industry Drive Water Main Relocation The project includes relocation of water utilities in conflict with planned drainage improvements along Pepperdam and Industry Drive. The project will be completed as a subcontract to the City of North Charleston drainage improvements contract under an Agreement with the City used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the water utility relocation portion of the work. Project completion is scheduled for December Anticipated Expenditures: $170, P age

14 32. Oak Terrace Preserve Water Distribution System Improvements The project involves water system improvements associated with the City of North Charleston s revitalization of the former Liberty Homes area. The City s project includes replacement of streets and underground utilities providing an excellent opportunity for CWS to make recommended distribution system improvements identified in the Water Distribution Master Plan. The water system improvements associated with the revitalization project includes replacement of unlined cast iron mains, which have experienced severe tuberculation resulting in poor pressure and reduced flow capacity, with new ductile iron mains ranging in size from 12 through 4 inch diameters, valves, hydrants and service connections as designed by Davis & Floyd. Construction of Phases A, I, and II is complete. The scheduling for Phase III is yet to be determined by the City. Project Status: Design phase Anticipated Expenditures: $885, Daniel Island Water Main Extensions: Included in the CIP to fund trunk water main projects pursuant to the Daniel Island Development Agreement. Funds are drawn as needed to comply with the terms of the agreement. Project Status: As required by development. Anticipated Expenditures: $100, Cainhoy Area Water Mains: Charleston Water has a contractual obligation to provide arterial water mains for portions of the Daniel Island and Cainhoy areas. This project would allocate funding to meet these obligations. Project Status: As required by development. Anticipated Expenditures: $4,000, P age

15 Wastewater Treatment Plant 35. Plum Island WWTP Phase 3 Improvements: A number of Phase 3 improvement projects at Plum Island are recommended as part of the 2005 Master Plan and the 2013 Master Plan Update Addendum to properly address the new NPDES permit limits, increasing flows, and replacement of worn out infrastructure. The Phase 3 Improvements are identified as a candidate for alternative delivery (Construction Manager at Risk) by bundling the recommended projects to expedite construction and facilitate integration of new facilities with minimal disruption of plant operations, as well as to maximize the improvements scope within the project budget. a. Pre-Treatment Facilities: The existing plant headworks infrastructure is badly deteriorated and temporary repairs made previously are not expected to last another 5 years. This project involves construction of a new headworks facility for screening and degritting influent flow, and equal flow distribution to primary clarifiers. The proposed facility will be designed to accommodate average daily flows of up to 54 MGD. b. Primary Clarifiers: The 2005 Plum Island Master Plan recommended replacement of the rectangular A and B side primary clarifiers with new circular clarifiers. The recommendation is based on a number of issues. First is the age of the A side primaries, which were installed with the original plant construction in 1970 and now in need of significant rehabilitation or replacement. Second is the high maintenance/replacement cost of the sludge removal equipment in the rectangular basins. Third is consolidation of the A and B side primaries into a single flow train to greatly simplify plant operations, and to maximize treatment capacity within a smaller footprint. Fourth is that a single flow train also simplifies adding a treatment step for an anoxic zone. Fifth is to facilitate covering the primaries for odor control. The proposed new primary clarifier facilities will provide for treatment capacity up to 36 MGD and enable future capacity increases up to 54 MGD with conventional treatment. Including this project with the Pre-Treatment Facility Project is expected to offer some economy of scale and simplification of plant piping for flow distribution. c. Anoxic Selector / Flow Splitting Basin: The Master Plan Update Addendum recommends adding a treatment step for an anoxic selector zone to address a significant (>50%) increase in influent ammonia that inhibits the effectiveness of the activated sludge treatment process at Plum Island. Addition of an anoxic selector will enable complete nitrification resulting in decreased aeration costs, improved control of effluent ph and alkalinity, and improved solids settleability. A flow splitting structure will be incorporated in the design of the structure to distribute flow equally to the downstream aeration basins. d. Final Settling Tanks: The 2005 Plum Island Master Plan recommended addition of up to three additional final settling tanks for the B-side treatment train to meet tighter effluent permit 13 P age

16 limits. Addition of the proposed anoxic selector will improve solids settleability thus enabling a higher loading rate for the final settling tanks that matches the aeration tanks loading rate. The six existing final settling tanks provide treatment capacity of up to 24 MGD. A seventh final settling tank will provide operational redundancy at current plant flows and treatment capacity of up to 28 MGD. e. Process Control Pump Station Improvements: As recommended in the 2005 Master Plan and subsequent Addendum, this project involves a complete dry-side overhaul of the existing influent pump station known as the Process Control Pump Station. Included will be rehabilitation of the structure, piping and equipment. Up to two new dry-pit submersible pumps and ancillary equipment will be added to make the station capacity 75 MGD, and discharge piping improvements and reconfiguration are included to redirect influent flow to the new Pre-Treatment Facility. f. Electrical and SCADA Improvements: These improvements are recommended to complete replacement of the 2300 volt electrical distribution network begun in a previous project. The project will complete the plant power conversion to a safer 480 volt network and replace obsolete equipment and stand-by power generators. The improvements are also necessary to provide monitoring and control, as well as normal and standby power for the equipment and facilities included in the projects listed above. g. Potable and Non-Potable Water System Improvements: These improvements are necessary to provide process water and fire protection for existing and proposed plant infrastructure facilities at Plum Island. Project completion scheduled for December Anticipated Expenditures: $70,000, P age

17 Wastewater Collection System 36. West Ashley Tunnel Replacement: Project involves replacement of the deep interceptor sewer tunnel serving the West Ashley service area of Charleston. It includes approximately 8,000 linear feet of 54-inch new sewer tunnel that stretches from the Croghan Shaft, beneath the Porter-Gaud School property, to the Plum Island WWTP where interconnecting tunnels will link the PIWWTP influent pump stations. Surface collection system improvements will reroute flows in the Charleston Country Club area. The existing West Ashley Sewer Tunnel is being replaced due to severe hydraulic restrictions in the existing 30-inch pipe and progressing deterioration of the pipe. The proposed tunnel will be designed to meet future wastewater flows from the West Ashley service area of at least 60 MGD. Project also includes the construction of a new influent pump station, odor control, and force main piping at the PIWWTP. The new pump station will be equipped with five 15 million gallon per day dry pit submersible pumps for a total capacity of 75 MGD. Ancillary equipment will include an electrical and control building, and a foul air odor scrubber. The pump station will discharge to the existing plan headworks via a new 48- inch force main. The project schedule will be extended due to the complexities and difficulty associated with construction of the pump station shaft. These improvements and those listed above will provide for a higher level of reliability, as well as greater capacity to help eliminate collection system overflows. Project completion scheduled for December Anticipated Expenditures: $62,600, Red Top Interceptor System Phase 2: This project is intended to extend the existing gravity interceptors in the Red Top area to facilitate growth. Project completion scheduled for December Anticipated Expenditures: $3,000, Governor s Cay Pump Station: Project involves wastewater pump station to meet future flow projections identified in CWS s Thomas Island & Cainhoy Wastewater Master Plan. Project will fund the incremental difference to increase the pump station capacity beyond the requirements of the Developer so that it can also serve area surrounding the Governor s Cay development. Project completion scheduled for December Anticipated Expenditures: $750, P age

18 39. Gardens at Riverview Farms: Project involves incremental funding to increase the capacity of new sanitary sewer systems for a proposed development to enable extension of wastewater service to surrounding areas in accordance with CWS master planning. CWS will fund the incremental difference to increase the sewer system capacity beyond the requirements of the Developer. Project completion scheduled for February Anticipated Expenditures: $220, Thomas Island Regional Pump Station and Interceptor: Project involves the design of a regional interceptor/collection system to carry wastewater flow from the Thomas Island and the Cainhoy areas to the DIWWTP. Currently the wastewater flow from this region is carried through the collection system located on Daniel Island to the DIWWTP. Based on future flow projections, the present capacity of the Daniel Island interceptor system will be inadequate to handle the future wastewater flows from Thomas Island and Cainhoy areas, thus that wastewater flow must be rerouted. This project design will address the wastewater infrastructure needs to route the Thomas Island and Cainhoy flow directly to the DIWWTP thereby freeing up capacity within the Daniel Island collection system to adequately handle its build-out. The project design is currently indicating the need for the installation of a pump station with approximately 15,000 linear feet of 24-inch wastewater force main, and various size gravity mains on Thomas Island. Present activity involves only preliminary design and easement acquisitions. Funding for the design and construction phase services will be requested in a future CIP bond issue. Project Status: Preliminary design phase (Easements) Anticipated Preliminary Design Expenditures: $1,150, Ashley Tunnel Shaft Site Improvements Project involves site work improvements at the Ashley Tunnel Barre Street, Bee Street, and Crosstown shaft sites. Project completion scheduled for June Anticipated Expenditures: $1,400, John s Island Wastewater Interceptor System Expansion Phase 2: This project involves extension of the gravity interceptor from Phase 1 westerly to towards River Road. Collectively, Phase 1 and 2 will provide infrastructure to accommodate future wastewater flow from development in the portions of Johns Island within the CWS Service Boundary south of Maybank Highway. Project Status: Design phase Anticipated Expenditures: $4,000, P age

19 43. Beresford Commercial Tracts Wastewater Main Extension: The project will include the first phase for extension of a gravity sewer main to serve commercial parcels fronting Clements Ferry Road between Jack Primus Road and Charleston Regional Business Center in conformance with the Harper Development Agreement. Project completion scheduled for December Anticipated Expenditures: $550, Harborview Road Sewer Main Relocations: Project involves relocation of sewer mains, services and other appurtenances in SCDOT right-of-way to resolve conflicts with roadway infrastructure and drainage improvements. Project completion scheduled for June Anticipated Expenditures: $435, Spring and Fishburne Sewer Main Relocations: Project involves relocation of sewer mains, services and other appurtenances in SCDOT right-of-way to resolve conflicts with roadway drainage improvements. Project completion scheduled for March Anticipated Expenditures: $3,150, Cainhoy Plantation Wastewater System Phase 1: Charleston Water System has a contractual obligation to provide trunk sewer systems for portions of the Cainhoy area. This project involves the trunk wastewater system for the first phase of development in Cainhoy Plantation. Project completion is scheduled for December Anticipated Expenditures: $5,800, Sanitary Sewer Interceptor Rehabilitation: Recent investigations have revealed extensive deterioration in the original Church Creek and Johns Island Interceptor Systems. Installed in the 1980 s, these gravity trunk sewer systems respectively serve the Highway 61 corridor from Savage Road to Bees Ferry Road, and a large portion of the Johns Island service area north of Maybank Highway. The rehabilitation project will include repairs to correct deterioration deficiencies in the second phase of Church Creek Interceptor and the first phase in the Johns Island Interceptor. Project Status: Design phase Anticipated Expenditures: $8,000, Pump Station 68 Rehabilitation: Project involves rehabilitation of the 35 year-old pump station. The wet well walls will be relined to the original profile and a new wet well top will be installed. The suction piping will be replaced. Project completion is scheduled for January P age

20 Anticipated Expenditures: $1,100, Clements Ferry Road Widening Phase 1 Wastewater Utilities Relocation The project includes relocation of wastewater utilities in conflict with planned road improvements associated with the first phase of widening Clements Ferry Road from I-526 to Jack Primus Road. The project will be completed as a subcontract to the SCDOT road improvements contract under an Agreement with SCDOT used to define each party s cost share responsibility as a percentage of the total awarded subcontractor pricing for the wastewater utility relocation portion of the work. Project completion is scheduled for May Anticipated Expenditures: $330, SC 7 and SC 61 Intersection Improvements Wastewater Utilities Relocation The project includes relocation of wastewater utilities in conflict with planned road improvements at the intersection of Highways 7 and 61. The project will be completed as a subcontract to the Charleston County road improvements contract under an Agreement with the County used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the wastewater utility relocation portion of the work. Project completion is scheduled for March Anticipated Expenditures: $490, Camp and Riverland Intersection Improvements Wastewater Utilities Relocation The project includes relocation of wastewater utilities in conflict with planned road improvements at the intersection of Camp Road and Riverland Drive. The project will be completed as a subcontract to the SCDOT road improvements contract under an Agreement with the SCDOT used to define CWS s cost reimbursement responsibility of the awarded subcontractor pricing for the wastewater utility relocation portion of the work. Project Status: Design phase Anticipated Expenditures: $155, Ashley Hall Plantation Road Bridge Improvements Wastewater Utilities Relocation Project involves relocation of wastewater utilities in conflict with Charleston County s planned bridge improvements where Ashley Hall Road crosses Bulls Creek. The project may be completed independently by a CWS contractor prior to the bridge improvements construction. Project Status: Design phase Anticipated Expenditures: $425, Pump Station 92 Force Main Replacement at Ashley Town Center Drive Project involved installation of a temporary piping system to by-pass a section of 24-inch ductile iron force main beneath a tidal creek that was found to be deteriorated and leaking. A permanent design solution includes installation of a parallel 24-inch force main drilled beneath the tidal creek. Project Status: Design phase 18 P age

21 Anticipated Expenditures: $1,180, SCDOT / RoadWise Required Wastewater Main Relocations: The South Carolina Department of Transportation requires utilities to relocate infrastructure that exists inside SCDOT rights-of-way when in conflict with road improvement projects. This project allocates funding for planned and unplanned SCDOT relocation projects. We have traditionally budgeted similar amounts for such needs in the past. Project Status: As required for road improvement projects. Anticipated Expenditures: $2,285, Cainhoy Area Wastewater Mains: Charleston Water System has a contractual obligation to provide trunk sewer systems for portions of the Daniel Island and Cainhoy areas. This project would allocate funding to meet these obligations. Project Status: As required by development. Anticipated Expenditures: $4,500, P age

22 Projects Completed Since the last CIP status report was issued, the following projects were moved into complete status: Chlorine Scrubber Replacement: The project involved replacement of the chlorine gas wet scrubber with a more efficient dry type scrubber. The old wet scrubber reached the end of its service life and had to be replaced to maintain a safe environment for Plant staff and surrounding community. CWS major capital funds in the approximate amount of $550,000 were expended on this project. Nassau Street Ground Storage Tank Replacement: The project involved demolition and replacement of a 2.5 million gallon steel storage tank with a new 3.5 MG prestressed concrete tank. CWS major capital funds in the approximate amount of $2,780,000 were expended on this project. Stiles Point Transmission Main Replacement: The project involved replacement of approximately 1700 feet of an existing 24-inch transmission prestressed concrete main with a new 24-inch ductile iron transmission main to mitigate vulnerability of the existing main and to maintain critical water service and fire protection redundancy for the Peninsula City from the Harborview Road Storage Complex. CWS major capital funds in the approximate amount of $702,000 were expended on this project. Daniel Island WWTP Influent Screen and Odor Control Addition: The project involved the addition of the third influent screen on the existing DIWWTP headworks, and odor scrubber equipment for the Daniel Island Tunnel Shaft. Capacity improvements to Pump Station 84 necessitated the third influent screen to provide redundancy. Recurring odor problems at the tunnel shaft dictated a need to add foul air scrubbing equipment. CWS major capital funds in the approximate amount of $1,100,000 were expended on this project. Pump Station RT-6 Upgrade: The project involved the replacement of an aging, limited capacity pump station with a new station that has greater depth and capacity to provide service to a larger area in the Bees Ferry Road corridor. These improvements are based on recommendations from the Wastewater Collection System Master Plan. CWS major capital funds in the approximate amount of $1,700,000 were expended on this project. Peninsula Water Main Rehabilitation - Phase 1: This project involved rehabilitation of approximately 11,000 linear feet of 6-inch and 8- inch cast iron water mains located along Congress, Race, Carolina, Bogard, and Rutledge streets. Rehabilitation allowed CWS to remove tuberculation and re-line the water mains and restore them to full operability without the expense and disruption associated with 20 P age

23 complete water main replacement. CWS major capital funds in the approximate amount of $2,020,000 were expended on this project. Rutledge Avenue Water Main Replacement Broad to Beaufain: This project involved replacement of approximately 830 linear feet of unlined cast iron water main with 8-inch ductile iron water main in conjunction with the City of Charleston s Colonial Lake renovations and street-scaping project. CWS major capital funds in the approximate amount of $143,000 were expended on this project. 21 P age

24 Financial Information III. Financial Information CHARLESTON WATER SYSTEM MAJOR CAPITAL IMPROVEMENT PROGRAM FINANCIAL ANALYSIS AS OF OCTOBER 31, 2016 WATER SEWER UTILITY UTILITY TOTAL ALLOCATED FOR ONGOING PROJECTS $ 142,805,000 $ 171,520,000 $ 314,325,000 COMPLETED PROJECTS $ 6,195,000 $ 2,800,000 $ 8,995, BOND PROCEEDS: 29,101,421 56,002,759 85,104,180 INTEREST EARNINGS ON 2010 BOND 341, ,050 1,105,845 TOTAL PROCEEDS AND INTEREST $ 29,443,216 $ 56,766,809 $ 86,210,025 TOTAL COSTS TO DATE 29,443,216 56,766,809 86,210, BOND FUNDS REMAINING $ (0) $ - $ (0) 2015 BOND PROCEEDS: 72,092,930 84,630, ,723,761 INTEREST EARNINGS ON 2015 BOND 438, ,449 1,082,469 TOTAL PROCEEDS AND INTEREST $ 72,530,950 $ 85,275,280 $ 157,806,230 TOTAL COSTS TO DATE 20,909,260 43,597,221 64,506, BOND FUNDS REMAINING $ 51,621,690 $ 41,678,059 $ 93,299,749 OTHER FUNDING SOURCES FOR ONGOING PROJECTS $ 40,830, $ 29,477,911 $ 70,308, P age

25 Conclusion IV. Conclusion The Charleston Water System staff greatly appreciates the support of the Commissioners, City Council and the Mayor for the 2010 and 2014 Capital Improvements Programs (CIP) and the bond issues to fund these much needed projects. We at Charleston Water System take our mission of protecting the environment and public health very seriously. It is our fervent goal to help improve the quality of life in Charleston and the surrounding communities by providing reliable and efficient clean water services that help to support the local economy, smart growth, public health and life safety through fire protection. Each of the projects included in the CIP have or will, in some manner, help Charleston Water System to better serve our community. System improvements for growth and capacity demands, fire protection, compliance with new environmental regulations, and aging infrastructure replacement needs require constant funding to ensure our water and wastewater systems work reliably. Continued implementation of the recommended critical infrastructure improvements identified in the treatment, distribution system and collection system master plans is essential to sustaining long-term quality water and wastewater services for all of the citizens and communities served by Charleston Water System. We look forward to your continued support in this important and vital public services endeavor. 23 P age

26 Project Location Map V. PROJECT LOCATION MAP 24 P age

27 4 SUMMERVILLE 24 GOOSE CREEK CHARLESTON WATER SYSTEM 2016 CAPITAL IMPROVEMENTS PROGRAM NORTH CHARLESTON! ( Water CIP! ( Sewer CIP Project No. 54, not shown on map, locations are throughout service area. Project No. 47 represented in two locations. 6 CAINHOY E DANIEL ISLAND RAVENEL WEST ASHLEY MEGGETT HOLLYWOOD JOHNS ISLAND CHARLESTON MT. PLEASANT JAMES ISLAND