Charleston Water System
Capital Improvements Program
Annual Report
2016
CHARLESTON WATER SYSTEM
CAPITAL IMPROVEMENTS PROGRAM
ANNUAL REPORT
2016
Mark Cline, P.E., Capital Projects Officer
December 2016
Charleston Water System Capital Improvements Program
Table of Contents
Table of Contents
I.
Introduction and Executive Summary
II.
Project Descriptions
III.
Financial Information
IV.
Conclusion
V.
Project Location Map
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Charleston Water System Capital Improvements Program
I.
Introduction and Executive Summary
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 2018. 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
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Charleston Water System Capital Improvements Program
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 2005. 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
2030. 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.
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Charleston Water System Capital Improvements Program
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 2030. 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.
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Charleston Water System Capital Improvements Program
II.
Project Descriptions
Project Descriptions
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 2017.
Project Status: Construction phase
Anticipated Expenditures: $11,300,000
2. 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
2017.
Project Status: Bid phase
Anticipated Expenditures: $500,000
3. 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 1904. 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
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Charleston Water System Capital Improvements Program
Project Descriptions
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 2019.
Project Status: Construction phase
Anticipated Expenditures: $51,300,000
4. 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: $2,700,000
5. 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: $1,250,000
6. 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: $2,100,000
7. 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
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Charleston Water System Capital Improvements Program
Project Descriptions
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 2018.
Project Status: Construction phase
Anticipated Expenditures: $19,100,000
9. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $11,800,000
10. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $2,100,000
11. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $3,200,000
12. 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 2016.
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Charleston Water System Capital Improvements Program
Project Descriptions
Project Status: Construction phase
Anticipated Expenditures: $2,100,000
13. 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: $3,500,000
14. 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 2017.
Project Status: Preliminary design phase
Anticipated Land Expenditures: $100,000
15. 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 2017.
Project Status: Preliminary design phase
Anticipated Expenditures: $1,000,000
16. 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
2017.
Project Status: Construction phase
Anticipated Expenditures: $1,400,000
17. 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
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Charleston Water System Capital Improvements Program
Project Descriptions
extension of a future transmission main from the Hanahan WTP pursuant to the Water
Distribution System Master Plan. Project completion is scheduled for May 2017.
Project Status: Construction phase
Anticipated Expenditures: $2,600,000
18. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $4,450,000
19. 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: $100,000
20. 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: $2,600,000
21. Hanover, Line and South Streets Water Main Replacement
Part of a multi-phased project to ultimately replace approximately 16,750 linear feet of 6inch 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
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Charleston Water System Capital Improvements Program
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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: $750,000
23. 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 2019.
Project Status: Construction phase
Anticipated Expenditures: $615,000
24. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $275,000
25. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $1,125,000
26. 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: $7,000,000
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Charleston Water System Capital Improvements Program
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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 2018.
Project Status: Construction phase
Anticipated Expenditures: $560,000
28. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $1,015,000
29. 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: $385,000
30. 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: $425,000
31. 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 2016.
Project Status: Construction phase
Anticipated Expenditures: $170,000
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Charleston Water System Capital Improvements Program
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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: $885,000
33. 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: $100,000
34. 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: $4,000,000
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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
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Charleston Water System Capital Improvements Program
Project Descriptions
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 2018.
Project Status: Construction phase
Anticipated Expenditures: $70,000,000
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Charleston Water System Capital Improvements Program
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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 48inch 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
2017.
Project Status: Construction phase
Anticipated Expenditures: $62,600,000
37. 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 2016.
Project Status: Construction phase
Anticipated Expenditures: $3,000,000
38. 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 2016.
Project Status: Construction phase
Anticipated Expenditures: $750,000
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Charleston Water System Capital Improvements Program
Project Descriptions
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 2017.
Project Status: Construction phase
Anticipated Expenditures: $220,000
40. 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: $1,150,000
41. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $1,400,000
42. 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: $4,000,000
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Charleston Water System Capital Improvements Program
Project Descriptions
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 2016.
Project Status: Construction phase
Anticipated Expenditures: $550,000
44. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $435,000
45. 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 2017.
Project Status: Construction phase
Anticipated Expenditures: $3,150,000
46. 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 2016.
Project Status: Construction phase
Anticipated Expenditures: $5,800,000
47. 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: $8,000,000
48. 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 2017.
Project Status: Construction phase
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Charleston Water System Capital Improvements Program
Project Descriptions
Anticipated Expenditures: $1,100,000
49. 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 2019.
Project Status: Construction phase
Anticipated Expenditures: $330,000
50. 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 2018.
Project Status: Construction phase
Anticipated Expenditures: $490,000
51. 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: $155,000
52. 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: $425,000
53. 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
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Charleston Water System Capital Improvements Program
Project Descriptions
Anticipated Expenditures: $1,180,000
54. 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: $2,285,000
55. 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: $4,500,000
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Charleston Water System Capital Improvements Program
Project Descriptions
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 8inch 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 a g e
Charleston Water System Capital Improvements Program
Project Descriptions
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.
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Charleston Water System Capital Improvements Program
III.
Financial Information
Financial Information
CHARLESTON WATER SYSTEM
MAJOR CAPITAL IMPROVEMENT PROGRAM
FINANCIAL ANALYSIS
AS OF OCTOBER 31, 2016
WATER
UTILITY
ALLOCATED FOR ONGOING PROJECTS
$
COMPLETED PROJECTS
$
2010 BOND PROCEEDS:
INTEREST EARNINGS ON 2010 BOND
TOTAL PROCEEDS AND INTEREST
$
TOTAL COSTS TO DATE
2010 BOND FUNDS REMAINING
2015 BOND PROCEEDS:
INTEREST EARNINGS ON 2015 BOND
TOTAL PROCEEDS AND INTEREST
SEWER
UTILITY
142,805,000 $ 171,520,000 $ 314,325,000
6,195,000 $
$
TOTAL COSTS TO DATE
2,800,000 $
8,995,000
29,101,421
56,002,759
85,104,180
341,795
764,050
1,105,845
29,443,216 $ 56,766,809 $ 86,210,025
29,443,216
$
TOTAL
(0) $
56,766,809
- $
86,210,025
(0)
72,092,930
84,630,831
156,723,761
438,020
644,449
1,082,469
72,530,950 $ 85,275,280 $ 157,806,230
20,909,260
43,597,221
64,506,481
2015 BOND FUNDS REMAINING
$
51,621,690 $ 41,678,059 $ 93,299,749
OTHER FUNDING SOURCES
FOR ONGOING PROJECTS
$ 40,830,834.02 $ 29,477,911 $ 70,308,745
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Charleston Water System Capital Improvements Program
IV.
Conclusion
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 a g e
Charleston Water System Capital Improvements Program
V.
Project Location Map
PROJECT LOCATION MAP
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4
SUMMERVILLE
24
GOOSE
CREEK
25
17
1
CHARLESTON WATER SYSTEM
2016 CAPITAL IMPROVEMENTS PROGRAM
31
7
2
19
5
3
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
55
34
16
46
43
49
32
23
38
E
40
8
48
37
12
33
DANIEL
ISLAND
26
9
47
15
30
53
RAVENEL
52
27
41
50
WEST ASHLEY
14
11 21
45 18
35
13
MEGGETT
HOLLYWOOD
JOHNS
ISLAND
39
42
44
29
51
28
22
CHARLESTON
36
47
MT. PLEASANT
20
10
JAMES
ISLAND