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Southgate Building 3

San Bernardino, California

Stormwater Retention


HW Southgate Building 3, LLC


Thienes Engineering, Inc.


Western Seven Corporation


July 2012

Technical Description:

  • 6,062' of 96” Aluminized Steel Type 2 

The Alliance California Logistics Campus is a 2,000 acre campus located next to the San Bernardino International Airport (SBD) on the grounds of the former Norton Air Force Base in San Bernardino, California. Anchored by San Bernardino International Airport, the project is close to Interstates 10, 210, and 215 and is within two miles of the BNSF Intermodal rail facility.The campus has attracted distribution centers for some of the world’s best corporations including Kohl’s department store, toy maker Mattel, Stater Bros. grocers, Pep Boys, Medline, Kohler, Quaker, and

Southgate Building 3 is a 951,660 square-foot building constructed on the Alliance California Logistics Campus. Engineers at Thienes Engineering were tasked with developing a stormwater management system to manage the 356,834 cubic feet of stormwater generated by the building’s roof and vast parking area. In addition to managing the large volume of stormwater, the solution had to meet local Low Impact Development regulations, be economical, and meet a very aggressive construction schedule.

The solution chosen was a retention system made from 96”, 16 gage, perforated aluminized type 2 CMP from Contech Engineered Solutions. Runoff is stored in the pipe and surrounding stone during a storm until it can be slowly released into the surrounding native soil. By utilizing subsurface infiltration, space is preserved for development, runoff is eliminated, and groundwater recharge can occur. Four different retention systems were constructed:

1. 2,352 LF 96” x 16 gage perforated ALT2 with 137,627 CF of storage

2. 1,056 LF 96” x 16 gage perforated ALT2 with 60,771 CF of storage

3. 1,158 LF 96” x 16 gage perforated ALT2 with 69,165 CF of storage

4. 1,496 LF 96” x 16 gage perforated ALT2 with 89,271 CF of storage

Contech’s local Sales Engineer worked closely with the contractor, Western Seven Corporation, to ensure timely delivery of all materials, resulting in the system being installed ahead of schedule.

Technical Description:

  • 6,062' of 96” Aluminized Steel Type 2 

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