Natural Treatment Site: Marshburn

Natural Treatment Site: Marshburn

Marshburn NTS site

The Marshburn NTS basin is located with the Marshburn Flood Control Basin, which is owned and operated by the Orange County Flood Control District.  As such, the site is regularly flooded and fills rapidly after storm events.  Unlike the Trabuco site, however, Marshburn NTS pools have maintained a healthy buffer of vegetation, thus making the site somewhat better at removing targeted nutrients. 

Portions of the site are also operated and maintained by the City of Irvine as well.  This site is primarily surrounded by undeveloped land, and agricultural uses.  As urbanization fills in, the site is expected to see higher flows and removal rates.

The site has adequate removal rates for nutrients including nitrogen and phosphate.  Suspended solids, and total coliform removals rates were good as well. Selenium removal rates were within the standard range.  

 Location & Size

ocation: Off Irvine Blvd., between 133 and Lambert
Size: 22.4 acres
Tributary Watershed: 11,000 acres
Status: On line, August 2008

 Biological Values

Marshburn has  better vegetation coverage around pools, and therefore, better wildlife. The following nesting bird species were observed on the site: Marsh Wren, Bewick’s Wren, House Wren, Mallard, Western Bluebird, House Finch, Black Phoebe, Tree Swallow, Common Yellowthroat, Song Sparrow, American Crow, Greater Roadrunner, Yellow Warbler, Mourning Dove, Yellow-breasted Chat, American Coot, Bullock’s Oriole, Ash-throated Flycatcher, American Robin, Cooper’s Hawk, Red-shouldered Hawk. Additional wildlife observations are planned for next year’s report.


Routine Maintenance Activities:

    • TruGreen LandCare provides routine irrigation and landscape maintenance services at the site. Additional work such as mulch replacement, irrigation repairs, aquatic herbicide application, aquatic vegetation removal, and sediment removal were performed throughout the year.
    • System operations staff performed weekly site inspection, water quality monitoring, and landscape and irrigation maintenance review.

Major Repairs: None during this fiscal year. The outlet is planned to be ugraded next fiscal year.
Major Improvements: None during this year

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