Specialties: Water/Wastewater Facilities
TOWN/VILLAGE OF HARRISON SEWER AND WATER PROJECTS
A neighborhood in the Town and Village of Harrison’s sewer and water infrastructure had settled due to existing soil conditions causing frequent backups and breakages and requiring replacement. LynStaar designed the approximately 2,000 l.f. of pipelines on concrete filled pipe piles to ensure no further settlement. Maintenance of the existing utilities also had to be maintained during the construction period. The approximate construction cost of the project was $1 million.
NORTH YONKERS PUMP STATION
The North Yonkers Pump Station is one of Westchester County’s largest pump stations with a peak pumping capacity of 70 MGD. Recently, the County discovered that instead of having two independent utility feeders to provide redundancy to the continuously operating station they had only one. This situation required the design and installation of a standby generator to provide backup power should the utility feeder fail. One major criterion the County had for construction was the pump station would not shutdown for any period of time. To meet their criteria, LynStaar created a two-phase approach to design the installation of a standby generator in a new adjacent building and setup parallel service to a new automatic transfer switch located in the new structure. From this structure, feeders were brought to the existing pump station that at the completion of the second phase would then be the pump station’s new electric service. The second phase of the project was to establish new distribution switchgear to parallel the existing switchgear. The sewage pumps were disconnected one at a time from the existing switchgear and connected to the new switchgear. When all the pumps had been transferred, the old switchgear was de-energized and removed. Important benefits to the owner were that they now had a reliable backup to their utility service and during construction their pumping operation was uninterrupted.
WESTCHESTER COUNTY PUMP STATION REHABILITATION PROGRAM
Westchester County owns and operates 42 sewage pump stations which transport raw sewage to seven treatment plants. A rehabilitation program was designed to rehabilitate these stations, some as old as 60 years, by upgrading their mechanical, electrical and HV systems. LynStaar Engineering’s role in this program was to design these upgrades without disrupting flow of the stations during construction and to provide control equipment that had the capability of being connected into the County’s WAN (Wide Area Network) for monitoring and control functions. This allows the maintenance and repair crews to monitor, control and have access to conditions of any station when an alarm is received to accurately and quickly determine the proper course of action to resolve the alarm. Standardization of equipment has been paramount in this program to reduce the amount of learning required to maintain and repair the equipment and the reduced amount of spare parts required in inventory. This approach reduced costs and provided a savings to the County. LynStaar Engineering also focused on the energy efficiencies of the pumps, controllers, and lighting to minimize energy consumption to reduce the annual operation costs.
HYDE PARK WATER TREATMENT PLANT
The Hyde Park, New York water treatment plant provides water for a growing community which presented a problem to the water department of how to maintain a backup supply of water during a power outage demand. When the treatment plant was originally built the water distribution tanks had enough storage capacity to serve the communities during an average power outage. As the community expanded, this backup supply became inadequate. LynStaar Engineering was retained to design the installation of two standby generators to provide backup power in case of a utility power outage. Prior to LynStaar’s design, during a power outage the power would energize and de-energize repeatedly requiring the plant personnel to restart the equipment which became costly at night when the plant was unmanned which necessitated personnel to address on an overtime basis. A feature was added, where the owner could maintain the plant on generator throughout the night to prevent restarting the equipment and it created a savings to the owner in reduced personnel costs.
BRIDGEPORT WATER POLLUTION CONTROL AGENCY
LynStaar performed construction management and shop drawing review of the East Side Treatment Plant Upgrade in Bridgeport, Connecticut for the Bridgeport Water Pollution Control Authority (WPCA). Two years subsequent to the completion of these upgrades, the WPCA assigned LynStaar the task of assessing the conditions of the existing electrical, lighting, fire alarm, and standby power systems in order to produce a preventive maintenance schedule for the East Side Treatment Plant, as well as the West Side Treatment Plant. By having this schedule the WPCA was able to include this in an agreement with the maintenance company, the preventative program resulted in less wear and tear on the pumps and extended life of the equipment. LynStaar was also required to accompany the maintenance personnel during the performance of the work to ensure compliance with the program. Most recently, the WPCA retained LynStaar’s services to determine the feasibility of using their on-site standby generators for participation in the utility company’s load shedding program.
MAMARONECK WASTEWATER TREATMENT PLANT
LynStaar performed inspections during construction of the Mamaroneck Sewage Treatment Plant in Mamaroneck, NY. The plant was converted from a primary treatment facility processing 24 MGD to a secondary treatment facility processing 24 MGD. This project was in construction for a period of three (3) years.
WESTCHESTER COUNTY - YONKERS JOINT TREATMENT PLANT
LynStaar designed a fire suppression system for several facilities housing sodium hypochlorite storage tanks, highly flammable chemicals and chemical tanks. Fire systems consisted of carbon dioxide extinguishing type and water deluge system. A smoke purge system was also incorporated into the design. In addition, LynStaar designed a new security system and fire alarm system for the entire plant interfacing the new fire suppression systems and smoke purge system design. Construction was monitored to contract completion over a four year period.