Transcript Project Presentation - Prince William County Service Authority

Colchester Interceptor System
Improvements Project
Community Meeting #1
August 25, 2016
SA Project Manager:
Debbie J. Maxwell, P.E., CCM
Design Engineer:
Michael Baker International
Construction Management:
Arcadis
Agenda
Purpose of the Project
Overview of the Limits of Service
Definitions
Purpose and Benefits of the Project
Existing System Conditions
Proposed System Improvements
Project Details
Site Activities & Notes of Interest
Anticipated Construction Schedule
Contacts
Q&A
Purpose of the Project
Limits of Service
7 Service Areas
Numerous Lift Stations
Miles of Gravity Sewers
Miles of Force Mains
Belmont Lift
Station
Project Limits
H.L. Mooney Water
Reclamation Facility
Featherstone
Lift Station
Purpose of the Project
Definitions
Gravity Sewer Lines
Sewer lines constructed to allow the wastewater to flow based
on a downward slope
Interceptor Sewers
Gravity Sewer mains which receive the flow from collector
sewers and conveys the wastewater to treatment facilities
Lift Station
A gravity sewer sump with a pump to lift accumulated sewage to
a higher elevation
Force Mains
A pressurized sewer line to convey wastewater from a lift station
to another service level and gravity sewer
Purpose of the Project
Purpose of the Project
Replace an existing and aged Interceptor Sewer System
Increase system capacity
Reduce or eliminate stormwater and groundwater from
entering the system
Benefits of the Project
Provide environmental benefits by relief of potential
surcharge conditions
Maintain service reliability
Existing System Conditions
Belmont Lift
Station
Belmont Force
Main
Colchester Road
Gravity Sewer
Discharge
48” Interceptor
Sewer
Featherstone
Lift Station
Existing System Conditions
Approximately 7,600 linear feet of 36” - 48” gravity
interceptor sewer
Approximately 1,500 linear feet of 8” and 12” gravity sewer
Proposed System Improvements
Install approximately 5,411 linear feet of 30” and 36”
force main
Replace approximately 2,132 linear feet of 48” gravity
sewer with 54” gravity sewer
Install approximately 1,530 linear feet of 8” and 12”
gravity sewer
Construct a new lift station
Proposed System Improvements
Belmont Lift
Station
Colchester Road
Gravity Sewer
Discharge
Marumsco Acres
Lake Lift Station
Belmont Force
Main
54” Interceptor
Sewer
Featherstone
Lift Station
Proposed System Improvements
Proposed System Improvements
Marumsco Acres Lake Lift Station
Proposed System Improvements
Marumsco Acres Lake Lift Station
Lift Station Details
The building is 14’ x 14’
Brick siding
Shingled roof
The Station capacity is 350 gpm
Emergency diesel engine
generator as back-up power
Odor Control
Carbon Filters
Bioxide (calcium nitrate)
Proposed System Improvements
Marumsco Acres Lake Lift Station
Site Activities
Activities
The Contractor will determine the final sequence of
construction
The Lift Station is limited to a 10 month construction
period
Open cutting of trenches
Force Mains and some gravity
Trenchless installation
Boring under Featherstone Road to avoid road closures
Microtunnelling for a portion of the 54” gravity main
Installation of new manholes
Tie-in of existing systems
Notes of Interest
Construction Notes of Interest
Notifications will be provided by the Service Authority and
the Contractor for any anticipated interruptions
Access will not be interrupted
Emergency Services, school buses, trash, mail and other
services will not be disrupted
Temporary parking areas will be coordinated with land
owners, the Department of Parks and Recreation, and
HOAs if needed by the Contractor prior to construction
Daily clean-up by the Contractor is required
A Service Authority Inspector will cover this project and
others close by and will be on site on a daily basis
A Construction Manager / SA Project Representative will
be onsite fulltime for the duration of the project
Final Layout
Belmont Lift
Station
Summary
Redirect flows to Belmont Lift
Station
Construct a new Lift Station
Extend the force main
Enlarge the gravity sewer size
Colchester Road
Gravity Sewer
Discharge
Marumsco Acres
Lake Lift Station
Belmont Force
Main
Benefits
Increase system capacity
Environmental benefits
54” Interceptor
Sewer
Featherstone
Lift Station
Relief of potential surcharge
conditions
Reduce or eliminate Inflow
Improve system reliability
Anticipated Construction Schedule
Project Duration
660 days / 21 months
Project Advertisement
August 2016 – November 2016
Anticipated Start Date:
Award Contract in January 2017
Begin Construction in February 2017
Anticipated End Date:
December 2018
Weekday Hours of Operations
7:00 a.m. to 5:00 p.m.
Previously negotiated and approved night time hours
Certain business parcels
Contacts
Community Relations & Outreach Liaison
Marlo Thomas Watson
571.285.8127
[email protected]
Or
Email: [email protected]
Website: www.pwcsa.org
Project Specific Website: http://www.pwcsa.org/colchester-project
Q&A
Any Questions?