PH16 Ecological Risk Assessment and Landscape Ecological Modeling
Exhibit Hall
8:00 AM - Thursday
(PH193) Southern California Bight 03 stormwater toxicity study in the San Diego Region: preliminary data and challenges faced.
Rudolph, J1, Stransky, B1, Bailey, H1, Wiborg, L2, Bay, S3, Greenstein, D3, 1 Nautilus Environmental, San Diego, CA, USA2 City of San Diego MWWD, Environmental Monitoring and Technical Services Division, San Diego, CA, USA3 Southern California Coastal Water Research Project, Westminster, CA, USA
ABSTRACT- In a continuing effort to assess the overall condition of the Southern California Bight, this project was designed to address the magnitude, extent, and duration of toxicity in eight river discharges and stormwater plumes in Southern California coastal waters using gametes of the purple urchin Strongylocentrotus purpuratus. To date, one of two planned storm events has been captured. The effect of collection time on toxicity was evaluated by testing samples collected approximately 1, 3, and 5 days following a storm event on 23 February 2004. Sample holding time effects were evaluated by retesting selected samples on multiple days following collection. An inter-laboratory study prior to program initiation, as well as split sample testing during the study, was conducted to address variability between participating laboratories. Results of the inter-laboratory study, test results for the Tijuana and San Diego River systems, and the challenges faced will be presented.
Key words: Stormwater, Bight, Urchin, Toxicity