Information from Andy Flores of the LA Bureau of Engineering regarding stormwater project to be constructed in Venice.

Information from Andy Flores of the LA Bureau of Engineering regarding stormwater project to be constructed in Venice.

The purpose is to inform/brief you of our proposed Proposition O Program, Grand Boulevard Stormwater Best Management Practices Project, to be constructed in the Venice area.

Update

Project construction contract was awarded by the Board of Public Works to Andrew Papac and Sons in the amount of $401,796.65 on May 28, 2008. Construction should start sometime in July/August 2008. The construction duration for this project is estimated at 100 working days. This period includes time for the fabrication and acquisition of the filtering devices and other materials. Actual days of physical construction are anticipated to be considerably less. Our plan is to minimize traffic inconvenience and to provide local traffic access at all times, nonetheless, minor inconvenience may be experience some from time to time.

Project Description / Purpose

The Grand Boulevard Stormwater Best Management Practices Project is funded by Proposition O funds and is located in the Venice area, which was identified as a project site location in the Santa Monica Bay Beaches Bacterial Implementation Plan Total Maximum Daily Load. The project will treat dry weather stormwater flow (spring and summer) and a portion of wet weather flow (winter) along Abbott Kinney Boulevard and Grand Boulevard, reducing the amount of bacteria and pollutants discharged into the Santa Monica Bay. The project aims to help meet a 10% bacterial reduction in the TMDL imposed by the State from wet weather flows by July 2009 by treating runoff from a total drainage area of 6.8 acres. The Filterra® system will provide an effective means of pollutant removal, and will be installed at seven locations in the sidewalk or parkway adjacent to the street as follows.

Site 1: Abbott Kinney Boulevard at Aragon Court (Southwest Corner) Unit Box Size: 6'x8';

Site 2: Abbott Kinney Boulevard at Palms Boulevard (Northeast Corner) Unit Box Size: 6'x6';

Site 3: Rialto Avenue at Alhambra Court (Northwest Corner) Unit Box Size: 4'x6.5';

Site 4: Grand Boulevard at Riviera Avenue (Northwest Corner) Unit Box Size: 6'x12';

Site 5: Grand Boulevard at Riviera Avenue (Northeast Corner) Unit Box Size: 6'x12';

Site 6: Grand Boulevard at Riviera Avenue (Southwest Corner) Unit Box Size: 6'x12';

Site 7: Grand Boulevard at Riviera Avenue (Southeast Corner) Unit Box Size: 6'x6'.
Filterra® Stormwater Bioretention Filtration System

The Filterra® system is comprised of a concrete planter box, engineered soil media, a tree, and an underdrain pipe which connects downstream to an existing storm drain catch basin. Polluted stormwater enters the tree well, where trash and floatable solids settle out in the upper mulch layer, while the polluted water infiltrates the soil media. As the water filters through the soil, the pollutants are decomposed, volatized, and incorporated into the biomass of the plant. The treated stormwater then is collected in a perforated pipe underlying the soil media, and is discharged to the storm drain system via the existing adjacent catch basin. The only visible elements above ground in sidewalk or parkway are the tree, tree grate, and concrete slab.

This system is specifically designed for urban environments, with high removal efficiencies for many pollutants such as bacteria, metals, sediments, and oil and grease. Projects similar to the this project have been implemented across the Mid-Atlantic region of the US with successful results

Should you have any questions, or if I may be of assistance, please do not hesitate to contact me at (213) 485-4496.

Thank you,

Andy Flores, P.E.
Civil Engineer/Project Manager 1
Prop O Implementation Program
Bureau of Engineering
(213) 485-4496
(213) 485-3122 Fax