TRANSPORTATION
    SITE DEVELOPMENT
    DRAINAGE & STORMWATER

 

714.966.9060 phone 
714.966.9085 fax

3151 Airway Avenue, Suite T-1
Costa Mesa, CA 92626

 

CALTRANS STORMWATER DATA REPORTS (SWDR)

 

State Route 55 PSR, Storm Water Data Report

Client: PBS&J, Caltrans District 12, OCTA

 

Orange County Transportation Authority initiated a project study report along SR-55 from I-405 to I-5 to determine the feasibility of adding new lanes, either general purpose, auxiliary, or HOV lanes. OCTA selected the PBS&J team for the PSR prep. PBS&J hired Civil Works Engineers to prepare the Storm Water Data Report (SWDR) as part of the PSR. Five alternatives were studied. The SWDR identified both design pollution prevention and treatment Best Management Practices in a section of freeway which currently has very few BMP measures in place. The proposed BMPs included six biofiltration swales and five infiltration basins. Multi-chambered treatment trains (MCTT) are to be evaluated further. Detention basins and wet basins were determined not feasible.

 

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