Technical Description:
- (2) Stormwater Management StormFilters
- (2) CON/SPAN Detention Systems
![]()
![]()
Facilities and parking area upgrade
incorporates high volume detention and
treatment
The Big Blue Bus provides bus service to the City of
Santa Monica, CA. Recently it upgraded its facilities
to include a parking expansion of the existing
6.5-acre bus terminal. The increase in impervious
area created a need for a stormwater management
solution that would meet the City of Santa Monica
stormwater requirements.
There were many site challenges that needed to be
overcome when it came to the detention system.
Requirements stated that no water could leave
the site. Due to space constraints, a below-grade
solution was needed. The ability to accept adequate
loading had to be considered, as the parking lot
would be used for large buses and fire trucks. The detention system also had to be below 15-ft due to possible
contaminated soils.
The project engineers chose a CON/SPAN concrete detention system from Contech Engineered Solutions. The
precast arch unit would be installed on cast-in-place strip footings with a paved invert, which is a thin nonstructural
section of concrete that provides a closed bottom for the vault. This allowed the system to be used for
detention. Providing continuous footing would also ensure no differential settlement.
The City of Santa Monica required that EPA treatment benchmarks for metals, solids, trash and debris, and oils and
grease in stormwater runoff be met for this project. In order to achieve this level of treatment, the Stormwater
Management StormFilter system — another product of Contech — was chosen.
Technical Description:
- (2) Stormwater Management StormFilters
- (2) CON/SPAN Detention Systems
![]()
![]()