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Transcript of Adaptive Management of SW_Final
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.
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
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)
Adaptive Management for Storm Water
0
100
200
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
Conceptual Facility Best Management Practices Options
Phase 1 Construction