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29 Pesticide Plant Soil Risk

29 Pesticide Plant Soil Risk - CEE 597 Lecture...

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CEE 597 – Lecture CEE 597 Lecture Environmental Risk Analysis Examples 4 April 2007Jery Stedinger Lecture 28 1
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Readings for This Topic Stevens and Swackhamer, "Environ. Pollution: A multimedia approach . . .” McKone, "...Exposure .. from Multiple Media and through Multiple Pathways..." ATSDR Public Health Assessment Guidance Manual Davis and Cornwell, “Air Pollution” M h ll t l “Ri k A t t Marshall, et al., “Risk Assessment at a Former Pesticide Production Facility” 4 April 2007Jery Stedinger Lecture 28 2
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What class should be learning What people do— What they try to analyze How people do it— What models they use How these models work (theory vs empirical) What criteria they compute How good is it— How accurate are predictions likely to be? Wh t i th l ? What issues can they resolve? 4 April 2007Jery Stedinger Lecture 28 3
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Marshall, et al., “Risk Assessment at a Risk Assessment at a Former Pesticide Production Facility” 4 April 2007Jery Stedinger Lecture 28 4
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RA at Former Pesticide Production Facility Illustration of issues and analysis Organization of real study Many many chemicals Select indicators Use pathway analysis rather than box models 4 April 2007Jery Stedinger Lecture 28 5
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A Risk Assessment of a Former Pesticide Production Facility
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Flowchart of risk assessment process
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Pesticide Plant and Facilities 70 chemicals present in samples 15 indicators were focus of study i i 2,3,7,8 TCDD represented all dioxins Arsenic all metals (see pg 480) 4 major structures + Tank farm ajo s uc u es a a 3.4 acres in industrial section of a major city 100,000 people within 1 mile Site once tidal marsh, bounded by tidal river Mostly fill on 30% of acre Flooding possible Shale & sandstone bedrock at 90 feet 570 55-gallon drums of material on site 4 April 2007Jery Stedinger Lecture 28 8
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Security and Monitoring Current control measures after discovery of problems 24 hr security guard Fence Permeable geo-textile fabric over site excluding building & equipment Ambient Air Station on building 10 m above ground For each of 31 days Æ Sept-Oct 24 hour samples 10 samples with highest Manganese and Iron analyzed Other sources most constituents Didn’t think site was a major source of many chemicals detected Æ vinyl chloride Priority Pollutants-129 compounds identified by EPA 4 April 2007Jery Stedinger Lecture 28 9
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Location of analytical samples 4 April 2007Jery Stedinger Lecture 28 10
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Schematic of surface water and groundwater pathways 4 April 2007Jery Stedinger Lecture 28 11
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Ambient Air Results for 10 samples
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Summary of detected pollutants 4 April 2007Jery Stedinger Lecture 28 13
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4 April 2007Jery Stedinger Lecture 28 14
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Summary of detected compounds
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