Pollutants in runoff from residential sources

AGRO 193

Lorence Oki, lroki@ucdavis.edu1, Darren L. Haver, dlhaver@ucdavis.edu2, Svetlana Bondarenko, sbond@ucr.edu3, Amber Manfree1, Mary Lou Flint4, Steven E. Greco5, Andy Bale6, Marylynn V. Yates7, and Jay Gan, jgan@ucr.edu8. (1) Department of Plant Sciences, University of California Davis, One Shields Avenue, Davis, CA 95616, (2) University of California Cooperative Extension, South Coast Research and Extension Center, 7601 Irvine Blvd., Irvine, CA 92618, (3) Department of Environmental Sciences, University of California Riverside, Riverside, CA 92521, (4) Integrated Pest Management Program, University of California, Davis, CA 95616, (5) Department of Environmental Design, University of California, Davis, CA 95616, (6) Davis, CA 95616, (7) Department of Environmental Sciences, University of California, Riverside, CA 92521, (8) Department of Environmental Sciences, University of California-Riverside, 900 University Ave., Riverside, CA 92521
Samples of runoff from eight residential areas in Sacramento and Orange Counties were collected every 1-2 weeks beginning in mid-2006 and analyzed for pesticides including organophosphates (2), pyrethroids (9), and fipronil; pathogens and surrogates (8 total); nutrients (N and P); and drinking water constituents of concern (7). Flows from these sites were also measured. This information is being used to characterize runoff from these sources, refine models of dry season pollutant loading, and promote beneficial landscape management methods. Results from this comprehensive sampling and monitoring study revealed high detection frequencies of pesticides, pathogens, and surrogates at all sites and apparent diurnal and weekly flow patterns. Preliminary model testing shows that current models may underestimate pollutant loading by as much as 50%. Outreach occurs at half of the study sites and effectiveness is measured through surveys of homeowner activities. Continued long term monitoring may verify adoption of pollutant reducing landscape management methods.

Exposure to Chemicals in Urban Aquatic Environments
8:15 AM-11:25 AM, Wednesday, August 19, 2009 Renaissance Washington -- Grand Ballroom South, Oral

Division of Agrochemicals

The 238th ACS National Meeting, Washington, DC, August 16-20, 2009