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AGENDA REPORT
DATE: March 11, 2002
TO: Honorable Mayor and City Council
THRU: John B. Bahorski, City Manager
FROM: Doug Danes, P.E., Director of Public Works, City Engineer
SUBJECT: INTERIM REPORT ON THE SAN GABRIEL RIVER DEBRIS
BOOM, PROJECT No. 50086
SUMMARY OF REQUEST:
The proposed City Council action will receive and file the presented information for the
proposed San Gabriel River Debris Boom Project No. 50086.
BACKGROUND:
During the Fiscal Year 1999/2000, the City was fortunate to apply and receive a State budget
allocation within the California Coastal Conservancy budget for the City's Ocean Water Quality
Program. $300,000 has been budgeted in the 2001/2002 Capital Improvement Program for the
design, environmental, and administration portion of the proposed San Gabriel River Debris
Boom. The Engineering Division has contracted with Moffatt and Nichol Engineers to prepare
the concept design and staff has been working with Los Angeles County Dept. of Public Works,
Orange County Public Facilities and Resources Department, and the City of Long Beach.
The San Gabriel River Debris Boom is a debris collection system designed to reduce debris
flows within the San Gabriel River watershed that ultimately are discharged at the river mouth.
The main goal of the project is to propose the best option for decreasing the debris load at the
mouth of the San Gabriel River, and in particular to decrease the quantity that is washed up onto
Seal Beach.
The conceptual design report addresses the three aspects of the debris collection system: the
location; the collection system; and the removal system. Location considerations included the
recreational usage of the river, ease of trash collection, debris loads and tidal influence. The
collection system considerations included net designs with cylindrical buoys and with pyramidal
buoys. The removal system considerations included manual labor with contract labor, county
crews, or inmate labor, front end loaders and dump trucks.
The proposed concept design is a net to be installed in the concrete channel at the confluence of
the San Gabriel River and Coyote Creek. The debris net design will use cylindrical buoys and a
specific net material. The proposed method for debris removal is a combination of a front end
loader and manual labor using pitchforks. The majority of the costs for the debris removal is in
the cost of hauling and disposing of the debris.
Agenda Item
Pending a final review from the Maintenance Division from Orange County, Los Angeles
County, the City of Seal Beach and the City of Long Beach, Moffatt Nichol will move forward
and complete the final design report. They will then move through the environmental process,
permitting process and final design process for this project. In addition, staff will obtain input
from various Public Interest groups such as the Friends of the San Gabriel River. Upon, it's final
design completion, staff is expecting that either the City of Seal Beach or one of the other team
agencies will be successful in securing the grant funding for it's construction. Additionally, the
City will have to execute agreements with both Los Angeles and Orange County for the
maintenance of the debris boom. The City of Seal Beach has applied for Proposition 13 grant
funding for this project. The end result of the construction would be less trash and
contamination washing up onto the City's beaches.
FISCAL IMPACT:
Funds in the amount of $300,000 are available in the City's Capital Improvement Program from
the State's California Coastal Conservancy budget. This amount will include the design,
environmental, and administration portion of the proposed debris boom. Staff has applied for a
Proposition 13 grant in the amount of $660,000 for the construction and partial operation of the
debris boom. Once constructed, the County of Los Angeles and County of Orange will be
responsible for it maintenance. It is also anticipated that with a reduction of debris washed up
onto the beach, City Staff will reduce its time to clean the beach.
Staff recommends that the City Council receive and file the presented information for the
proposed San Gabriel River Debris Boom Project No. 50086.
Prepared By:
Marl L Vukoje
Assistant City Engineer
Bahorski, City Manager
Revi ed By:
Doug . Dan
Director of Public Works/City Engineer
Agenda Item