Natural Treatment Site: Trabuco

Natural Treatment Site: Trabuco

Trabuco NTS site

The Trabuco NTS basin is located with the Trabuco 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.  This makes it difficult to maintain healthy vegetation along the margins of the NTS pools, which would likely help in nutrient removal.  IRWD staff are currently working on potential solutions to this issue.  Portions of the site are also operated and maintained by the City of Irvine. 

The site has adequate to below-expected removal rates for nutrients including nitrogen and phosphate; suspended solids, and total coliform removals were better. Selenium removal rates were within the standard range.

 Location & Size


Location: 13952.5 Jeffrey Road, Irvine
Size: 18.4 acres
Tributary Watershed: 22,000 acres
Status: On line, August 2008

 Biological Values


The site’s lack of vegetation, especially around the NTS pools, provide low wildlife values. It is hoped that the lack of vegetation around the pools can be addressed in the next year. 
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.

 Maintenance


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: The concrete apron adjacent to the main 101 inlet was repaired. Additionally, the concrete swale on the north side of the basin was replaced.
Major Improvements: None during this fiscal year

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