Bay Park Phase E2

Unit Substation No. 2 and Electrical Distribution

The Nassau County Bay Park Sewage Treatment Facility sustained catastrophic damage as a result of Super Storm Sandy and the associated high winds, flooding, and salt water intrusion.

H2M was called upon for electrical engineering assistance to successfully complete the restoration of plant operations, followed by design and construction administration services for the Phase E2 upgrade work to the second unit substation that provides power to several crucial systems throughout the facility.

H2M worked closely with NCDPW employes and the joint venture team to prepare complete design documents for a $19 million upgrade project under an expedited five-month time frame to meet the FEMA Hazard Mitigation Program reimbursement goals and County schedule requirements.

The work consists of designing new/upgraded electrical distribution systems above the designated flood/surge water high water level of 18.25 feet above mean sea level (approximately 10 feet above current grade). The substation and external transformers are housed within a single elevated building foot print.

Demolition and construction of a new raised MCC room within the Effluent Screening and Disinfection Building (ESDB), and all related miscellaneous electrical power and control service interconnections, was determined to be a more cost-effective approach to relocating all these systems to the new unit substation.

Creating space to construct the new unit substation required the demolition and removal of a two-story masonry and concrete Odor Control building with all process mechanical piping, equipment, and associated appurtenances. Demolition and construction of a new raised MCC room within the Effluent Screening and Disinfection Building (ESDB), and all related miscellaneous electrical power and control service interconnections, was determined to be a more cost-effective approach to relocating all these systems to the new unit substation.

H2M performed construction engineering services for the Phase E2 project which included: shop drawing review, design document clarifications, periodic observations, review of proposed modifications, and changes to the design.

H2M’s design services also included: concrete encased electrical ducts (medium voltage and low voltage), manholes and handholes  including excavation, conduit, reinforcement, and concrete  encasement, bedding, backfilling, and surface restoration;  demolition of the odor control building; replacement of ESDB Roofing System; existing loads/MCCs served by existing Unit  Substation #2 (USS2) were repowered via new USS2; and new raised electric service feeds to the fire protection building and dichlorination building from USS2. Short circuit analysis, protective device coordination, and Arc Flash studies were performed for all modified or replaced electrical equipment.