Natural Treatment Site: Forge
The Forge NTS site is located along Portola Road in the foothills north of Irvine. The site is surrounded by urban development and agricultural land uses. The site receives routine water quality monitoring, and it sees moderate removal rates for nutrients such as nitrogen and phosphorus, as well as suspended solids. In 2019, water quality sondes were installed, allowing the continuous collection of water quality parameters such as pH, temperature, electrical conductivity, turbidity, and dissolved oxygen. In 2020, Endemic Environmental hydro-seeded the slopes of Forge to fill in open spaces with natives and to help out-compete weedy invasive species with hearty and long-lived native species. Went online June 2007.
Location & Size
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Location: 3801.5 Portola Parkway, Irvine
Size: 3 acres
Tributary Watershed: 485 acres
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Biological Values
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The site is somewhat isolated, and wildlife values are low. 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.
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Maintenance
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Routine Maintenance Activities:
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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.
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System operations staff performed weekly site inspection, water quality monitoring, and landscape and irrigation maintenance review.
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