Natural Treatment Site: El Modena
El Modena NTS basin is located in El Modena Park, which is operated by the City of Orange. Flow into the NTS basin is diverted off of the El Modena channel and then pumped back up into the channel after it has been treated in the system. A Solar Bee aerator and pump are present to help alleviate sulfide buildup in the basin. This NTS site is occasionally taken offline when storms occur or when OC Public Works Maintenance occurs downstream of the site.
The site sees moderate removal rates for nutrients including nitrogen and phosphate; suspended solids, and total coliform removals were excellent. Selenium removal rates were within the standard range. Went online June 2006.
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