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Leesville Road Marketplace

Raleigh, North Carolina

Stormwater Management

Owner:

Halpern Development Company

Engineer:

McAdams

Contractor:

Gaines and Company

Installation:

March 2018

Technical Description:

  • 770 LF  of 120' Aluminized Steel Type 2
  • Stormwater Management StormFilter®

Leesville Road Marketplace is a new retail development that consists of a grocery store as the main anchor and additional retail, totaling 62,100 square feet.

The new facility needed to follow the North Carolina Department of Environmental Quality (DEQ) regulations that call for treating the first 1” of runoff and storing the 10-year storm quantity. Engineers at McAdams selected a Corrugated Metal Pipe (CMP) Detention System and the Stormwater Management StormFilter from Contech to meet these requirements. Contech products were chosen as it was the more cost effective solution when compared to the originally designed precast concrete storage system with sand filter. Ease of construction and cost of long term maintenance were also contributing factors.

The detention system was made from 770 LF of 120” diameter, Aluminized CMP that provides 60,565 CF of storage. Using this large pipe diameter reduced the system footprint and excavation costs. The StormFilter consists of an 8’ x 14’ vault that contains 31 filter cartridges filled with Phosphosorb; a lightweight media built that removes total phosphorus (TP) by adsorbing dissolved-P and filtering particulate-P simultaneously.

The project had a very tight footprint, which required a unique layout of the underground detention system. Contech assisted with accurately sizing the StormFilter to meet NCDEQ nutrient removal requirements and provided drawings of the StormFilter along with combined water quality volume and detention storage.

Contech was able to offer a cost-effective solution to meet the budget of the project, meet the construction timeline while supporting the contractor and engineer of record throughout the entire process.

Technical Description:

  • 770 LF  of 120' Aluminized Steel Type 2
  • Stormwater Management StormFilter®

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