Proposed - Massachusetts Water Resources Authority

Sub-phase
Prison Point/Cottage
Farm CSO
Preliminary
Design/Study
Pump Station Rehab
Preliminary
Design/Study
Prison Point Dry
Weather Flow &
Stripping Pump
Improvements
System Relief &
Contingency Planning
Study
DeLauri Pump Station
Electrical Room
Cooling
Caruso Pump Station
Improvements
Prison Point Pump and
Gearbox Rebuilds
Scope
Preliminary design/study to replace and/or upgrade mechanical, electric, chemical feed,
and instrumentation equipment. Additionally, need to replace diesel driven pumps with
VFD electric pumps. This project will look to add more redundancy at Prison Point to
ensure proper CSO discharge treatment. Preliminary design will be performed under a
Technical Assistance As-Needed task order and is anticipated in early 2012. Final
Design and Construction phases will be added to a future CIP cycle.
Preliminary design/study for upgrades at Hayes, Hingham, Caruso, DeLauri Pump
Stations, Wiggins-Castle Island Terminal, and the Somerville-Marginal CSO Facility.
The project is to follow contract 7162, Pump Station and CSO Condition Assessment,
which may result in other facility improvements. Upgrades to the facilities will ensure
design output is met. Failure of a particular piece of equipment could lead to failure of
another; such as failure of a grinder could negatively impact a pump. Upgraded
facilities should result in fewer corrective maintenance calls. This is a system wide
project designed to upgrade multiple facilities to ensure worker safety, equipment
integrity, environmental protection, and ensure service is not interrupted. Design and
Construction phases will be added to a future CIP cycle.
This project is designed to determine the feasibility of replacing two dry weather
pumps and adding a second wetwell stripping pump to ensure facility reliability and to
pump down the wetwell at a faster rate.
This project will investigate what can be done to avoid serious flooding issues.
Increased capacity or controlled relief points must be identified in order to address
flooding issues that occur during severe wet weather. Project will be designed to create
increased capacity within the collection system in order to decrease SSO discharges.
Scope may also include facility specific plans for a failure at MWRA facilities.
During wet weather conditions when multiple pumps are operating, the Variable
Frequency Drives overheat causing a reduction in pumping capacity. This problem is
magnified during summer months, causing undesirable high temperatures in the
electrical room. An HVAC evaluation was performed and recommendations made for
additional electrical room cooling to eliminate VFD overheating and protect electrical
equipment from damage. With the recent installation of a 1.5 megawatt wind turbine at
the facility, security related improvements were recommended. A task order was
executed in September 2011 to design the proposed HVAC and security related
improvements.
This project would replace the existing standby generator, HVAC system, and the fire
detection system at the Caruso Pump Station. The standby generator is 20 years old
and is one of a few existing generators of this type. The manufacturer is no longer
making spare parts and there is only a limited quantity of available spare parts. The
generator will be replaced with a newer model with readily available parts to ensure
reliable back-up power. Technical Support evaluated the HVAC system and
determined it was in need of replacement. Due to the age of the fire detection system,
frequent problems, the fire protection system needs to be replaced. Design/CA/REI
services will commence in 2012.
Refurbishment of the Prison Point CSO Gearboxes based on an inspection report
performed in May 2010 that indicated that the current gearbox condition could result in
bearing failures. It is critical during major wet-weather events to have all four pumps
operational which are driven by gearboxes to provide maximum station capacity and
provide redundancy at this critical CSO facility.
Interception and Pumping - 40