HA2 Urban Stormwater Impacts on Estuaries
255 Portland Ballroom
8:00 AM - 12:00 PM, Thursday

() Monitoring pesticide inputs into coastal retention ponds and estuarine systems.

DeLorenzo, M1, 2, Pennington, P1, Sanders, M1, Chung, K1, Wirth, E1, Fulton, M1, McConnell, L3, 1 NOAA/National Ocean Service, Charleston, SC, USA2 University of South Carolina, Columbia, SC, USA3 USDA Environmental Quality Laboratory, Beltsville, MD, USA

ABSTRACT- Resort/residential communities associated with golf courses require significant applications of insecticides, herbicides, fungicides, and fertilizers for maintenance. These developments are often located near sensitive estuarine habitats, and represent a potentially higher hazard for acute and chronic toxicity to estuarine organisms than other urban land uses. This study monitored pesticide concentrations in surface and ground water associated with six golf course and resort community sites, including a golf course pond, two residential area ponds, a receiving tidal creek, and two ground water wells. Sampling for 50 different pesticide analytes using GC/MS identified atrazine (a herbicide used for turf grass and home lawn care) as the most commonly detected pesticide in the surface and ground water samples. Monthly sampling was conducted using a joint approach of GC/MS for all analytes and immunoassay kits for atrazine, chlorothalonil (fungicide), chlorpyrifos (insecticide), and 2,4-D (herbicide) in order to characterize any seasonal differences in pesticide contamination. Immunoassay results indicate low levels of atrazine in both the surface and groundwater of the two residential sites and in the adjacent tidal creek. Atrazine was detected in 52% of the samples collected from August 2002 through July 2003, representing 100% of the sites sampled. The maximum atrazine concentration measured (0.605 micrograms/L) was at the tidal creek site in September 2002. Movement of pesticides during a moderate rain event was also characterized in November 2003. Samples were collected before, during and after the rain event. Atrazine was the most prevalent compound during the rain event (present in 68% of the samples). A maximum atrazine concentration of 44 micrograms/L was measured during the rain event from a storm drain sample. Chlorpyrifos was detected once during the rain event, with a concentration of 0.25 micrograms/L in the estuarine tidal creek.

Key words: stormwater, pesticides, estuaries, monitoring

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