dpr monitoring efforts within salt creek watershed, orange county robert budd, phd january 20 th,...
TRANSCRIPT
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- DPR Monitoring Efforts Within Salt Creek Watershed, Orange County Robert Budd, PhD January 20 th, 2015
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- DPR Monitoring Sites Northern CaliforniaSouthern California
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- Salt Creek Watershed
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- Prioritization Model Based on use and available toxicity data Used to prioritize pesticides for monitoring purposes DPR Urban Monitoring Program Salt Creek Sampling Protocol 2008 Present Sampling 4 events/year: 2 dry and 2 storms 8 sampling sites; 4 upper watershed storm drains 3 lower watershed receiving waters 1 treatment facility outfall 173 water samples, 72 pesticides monitored Concentrations compared to aquatic benchmarks set by US EPA
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- Frequency of Detection of Pesticides Monitored Within Salt Creek Watershed (2008- Present)
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- Dash = Mean concentration Dotted = Minimum EPA Aquatic Benchmark
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- Proposed Gauging Station Niguel Road
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- Flow Gauging Station Objective: Ability to estimate contaminant loading within main stem of watershed on annual basis EventEstimateMeanSDMedian2.5th PCT97.5th PCT Storm Flux (g/s)3.144.911.680.2115.20 Load (g/yr)1.750.111.751.561.98 Nonstorm Flux (g/s)1.381.620.890.155.38 Load (g/yr)42.990.2742.9942.4743.54 Example: Fipronil at SC3 (storm drain) Monte Carlo Estimation of Annual Fipronil Loading Using 2013 Flow Data
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- Questions ? http:// www.cdpr.ca.gov/docs/emon/pubs/protocol/study270protocol2014_15.pdf Sampling protocol for DPR Study Number 270; Ensminger, M. P., R. Budd, K. C. Kelley, and K.S. Goh. 2013. Pesticide Occurrence and Aquatic Benchmark Exceedances in Urban Surface Waters and Sediments in Three Urban Areas of California, USA, 2008-2011. Environ. Monit. Assess. 185: 3697-3710 Published results through 2011;