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Concord Consulting Engineering

Case study · 2021–2024

Two mixed-use buildings, Hillside Avenue, Queens

Concord designed sprinkler, fire alarm and plumbing work, including reduced-pressure-zone (RPZ) backflow assemblies, for two three-story mixed-use buildings at 168-31 and 168-33 Hillside Avenue in Queens.

The challenge

Each building has commercial and residential space, and each needed its own sprinkler, backflow and fire alarm approvals from NYC DOB, NYC DEP and FDNY.

What Concord did

  • Separate commercial and residential sprinkler hydraulic calculations.
  • Sprinkler design filed with NYC DOB.
  • A fire pump selected for 168-33 Hillside Avenue.
  • RPZ backflow assemblies and a domestic booster pump.
  • NYC DEP backflow (RPZ) applications, refiled in 2023 with the device test report.
  • Fire alarm design.

Outcome

  • NYC DEP backflow (RPZ) applications approved.
  • FDNY letters of acceptance for the fire alarm in July 2024: July 19 for 168-31 and July 22 for 168-33.

Project facts

Location
168-31 and 168-33 Hillside Avenue, Queens, NY 11432
Years
2021–2024
Sector
Mixed use, 3 stories (two buildings)
Trades
Sprinkler, fire alarm, plumbing (RPZ backflow prevention, domestic booster pump)

From Concord's site visits

Reduced-pressure-zone backflow assembly with gauges beside red sprinkler piping and gate valves in a cellar, 168-33 Hillside Avenue, Queens
Installed RPZ assembly and sprinkler piping at 168-33 Hillside Avenue. Photo: Concord Consulting Engineering, December 2023.
Reduced-pressure-zone backflow assembly on red piping with brass water-service fittings below, under an open ceiling, 168-31 Hillside Avenue, Queens
Installed RPZ assembly at 168-31 Hillside Avenue. Photo: Concord Consulting Engineering, December 2023.

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