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Public Works
 | Machado Lake Project

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Fact Sheet

May 20, 2014 at 7:00 P.M.
Madrona Marsh Nature Center

Machado Lake is an urban lake located in the Ken Malloy Harbor Regional Park in Harbor City.  It is the receiving body of storm water and urban runoff from approximately 20 square miles.

The 40-acre kidney-shaped lake is, on average, three feet deep and approximately 3000 feet long and located south of Pacific Coast Highway and east of the 110 Freeway adjacent to the Harbor Park Municipal Golf Course and Los Angeles Harbor College. Machado Lake is identified as "impaired" by the State of California under the Clean Water Act for nutrients, toxics and trash.

The Machado Lake Trash TMDL Project
Many cities have watersheds that tributary to Machado Lake. Six of these cities, Torrance, Carson, Lomita, Palos Verdes Estates, Rancho Palos Verdes and Rolling Hills Estates, have partnered in an effort to install full capture trash screens on catch basins in their cities to comply with the Los Angeles Regional Water Quality Control Board Total Maximum Daily Load (TMDL) limit of zero trash discharged to Machado Lake.

Led by the City of Torrance, these cities received a grant from the Proposition 84 Stormwater Grant Program to fund the installation of trash screens in the six cities and "no parking" signs for street sweeping in Torrance with the goal of 100 percent installation of catch basin screens by March 2016.

Why is it important to install full capture screens in catch basins?
Under the Federal Clean Water Act, Machado Lake is impaired and identified as unsafe for human and wildlife for nutrients (algae, ammonia, odor and eutrophic conditions), toxics (Chem A, Chloradane, DDT, Dieldrin, PCBs) and trash in its current state.

The installation of Automated Retractable Screens (ARS) and Connector Pipe Screens (CPS) to catch basins in cities that tributary to Machado Lake address the Trash TMDL, but will also help with the Machado Lake Nutrients and Toxics TMDLs.  The ARS units prevent leaves and debris from entering the catch basins and decomposing, thereby reducing nutrient loads and ARS units and street sweeping greatly reduces the sediment loads to the lake and sediments carry toxics.

Who is paying for this installation and how much does it cost?
The total cost of this project is $2,511,499.  The Proposition 84 Stormwater Grant Program is funding $1,745,800.  Each of the six partner cities will contribute matching funds for the remaining $765,699, of which Torrance is contributing $517,866.04.

What should I expect during installation of these catch basin screens?
The schedule to install the ARS and CPS units will vary in each of the six cities but, generally, installation will occur from April through June 2014.

Installation of the screens will occur at the storm drain catch basins. Storm drains are located throughout each city. Contractor crews will visit each catch basin to take measurements which should not require lane closures. The installation of the screens takes between one and three hours and temporary lane closures and parking restrictions are required.  In cases where parking restrictions are necessary, residents and businesses will be notified at least 48 hours in advance and temporary "no parking" signs will be posted.

Trash service will not be affected. The contractor will move trash cans as needed for pick up.

What are the days and hours of construction?
Installation of the ARS and CPS units will be limited to Monday through Friday from 8:30 a.m. to 3:30 p.m. in all partner cities.

How do I get information about the installation process?
Information about the project will be posted on each partner city's website. Public meetings will be held in each city before installations begin. Construction notices will be delivered to residents and businesses affected and temporary no parking signs will be posed 48 hours in advance.

Who do I contact if I have a question?
Questions about the project should be directed to Machado Lake Trash TMDL Community Construction Information Project Manager Trisha Murakawa via email at Please include a phone number if you would like a phone call.

What can I do to help?
You can help by not littering. It seems like a "no-brainer" but cigarette butts and other trash flow into our storm drains carrying chemicals and other dangerous pollutants that stream through the tributaries and into Machado Lake. Trash is causing harmful effects to humans and wildlife, making Machado Lake unsafe and cigarette butts are the largest source of trash.  It's your trash, your decision. Please don't toss your cigarette butts on the street.

Partner Cities

City of Carson - 

City of Lomita - 

City of Palos Verdes Estates - 

City of Rancho Palos Verdes - 

City of Rolling Hills Estates - 

City of Torrance -