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Long Beach City College

Long Beach, California

Stormwater Detention

Owner:

Long Beach City College

Engineer:

KPFF Long Beach

Contractor:

Pima Construction

Installation:

October 2013

Long Beach City College (LBCC), established in 1927, is a community college located in Long Beach, California. LBCC serves the cities of Long Beach, Lakewood, Signal Hill, and Santa Catalina Island and has an enrollment of 25,000 students.

LBCC has continued to implement new infrastructure and modernization projects, including a new stormwater runoff compliance project. New state law requires property owners to address water quality by controlling stormwater drainage and water conservation. This project implements drainage improvements to reduce runoff pollutants as required by law.

With the new system, stormwater from the central quad areas and surrounding buildings will be collected in an underground detention system. The engineers on the project, KPFF Long Beach, originally proposed a system using plastic crates. Contech worked closely with the engineer and the contractor, Pima Construction, to provide an alternative solution that included two CDS hydrodynamic separators and a detention system made from 951 linear feet of 96” diameter polymer-coated CMP designed to accommodate a 50-year storm event. Polymer coating was used to alleviate concerns about corrosion of the CMP associated with the high salt content of the reclaimed water.

The CDS units provide pretreatment by removing 100% of floatables and neutrally buoyant material without binding, protecting the detention system from solids occlusion and isolating sediment in a single structure for easy maintenance. The Contech solution provided a number of benefits over the crate system, including structural improvements, maintenance access, ease of installation, and elimination of the need for a liner, which has the potential for failure.

The stormwater runoff compliance project is scheduled to be completed in the summer of 2014.

Technical Description:

  • (2) CDS® hydrodynamic separators
  • CMP Detention - 951 linear feet of 96” diameter polymer-coated CMP

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