Adaptive Management of SW_Final

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An Adaptive Management Strategy for Reducing PCBs in Storm Water April 5, 2016 Environment Virginia Symposium Robert Wallace, P.E. A. Currie Mixon, P.E.

Transcript of Adaptive Management of SW_Final

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An Adaptive Management Strategy for Reducing PCBs in Storm Water April 5, 2016

Environment Virginia Symposium

Robert Wallace, P.E. A. Currie Mixon, P.E.

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Aqueous Analyses

mg/L 1E-6

ng/L 1E-12

pg/L 1E-15

μg/L 1E-9

ppm of ppm

PCBs and Analytical Methods

g/L 1E-3

Method 8082 Not congener-

specific $100-$200/sample

Method 1668 Measure all 209 congeners, sum

$750-$1000/sample

Detection Limit of Method 1668 Detection Limit of Method 8082

• 209 possible congeners • Chemical stability • Thermal stability • Bioaccumulative

-2 -3 -1 -5 -6 -4 -8 -9 -7 -11 -12 -10 -14 -15 -13

Units for typical storm water pollutants

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Property Description of PCBs Organic carbon partitioning

Strongly hydrophobic (sorbs to carbon)

Particle size 90% of PCBs associated with particles ≤ 20 µm Aqueous Solubility 0.03– 0.6 mg/L (Arochlors) – 30,000 to 600,000 ng/L Biodegradability Very low to none

• Vast majority of PCB mass associated with suspended solids

• Preventing erosion (reducing suspended solids) is more effective than hydraulic detention for reducing PCB discharges

Conceptual Site Model Considerations

Photo of Phase 1

𝑀𝑀𝑃𝑃𝑃𝑃𝑃𝑃 = (𝐶𝐶𝐴𝐴𝐴𝐴.,𝑃𝑃𝑃𝑃𝑃𝑃∗ 𝑄𝑄𝑃𝑃𝐵𝐵𝐵𝐵𝐵𝐵) + (𝐶𝐶𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆,𝑃𝑃𝑃𝑃𝑃𝑃∗ 𝑇𝑇𝑇𝑇𝑇𝑇 ∗ 𝑄𝑄𝑆𝑆𝑆𝑆)

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Adaptive Management for Storm Water

0

100

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300

400

500

600

700

800

Pre-Construction Avg. Post-Construction Avg.

PCB

Con

cent

ratio

n (n

g/L)

Outfall 003

Outfall 004

Maxima

Minima

Phase 1 Early Results

Evaluate sample data

Review facility storm water

management

Formulate solution (PMP)

Design & construct

Collect data

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Conceptual Facility Best Management Practices Options

Phase 1 Construction