Natural Treatment Site: Lower Eastfoot

Lower Eastfoot NTS site

Lower Eastfoot NTS site has functioned well throughout this year.  There have been no problems with sulfides, and algal growth in the pools has not been a problem. 

Water quality monitoring at the site has shown good removal rates for all nutrients including nitrogen and phosphate.  Suspended solids and total coliform removals were adequate as well. Selenium removal rates are outside of the standard range, and this will have to be monitored in the future. 

The site will need sediment removal from the inflow pool in the next two years, but currently is not a problem. Went online June 2007.

 Location & Size

ocation: 3801.5 Portola Parkway, Irvine
Size: 3 acres
Tributary Watershed: 288 acres

 Biological Values

This site has above average wildlife values; the presence of good dry weather flows has allowed many more species to utilize the site than the dryer Port Culver NTS basin, for example.  Although the surrounding areas are primarily urban, the site sits along the Peter’s Canyon Channel, which acts as a corridor for many species. 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.