Mike Johns, PhD...Mike Johns, PhD Toxicology Consultant to San Diego Unified Port District. Item No....
Transcript of Mike Johns, PhD...Mike Johns, PhD Toxicology Consultant to San Diego Unified Port District. Item No....
![Page 1: Mike Johns, PhD...Mike Johns, PhD Toxicology Consultant to San Diego Unified Port District. Item No. 9 - Supporting Document 10](https://reader036.fdocuments.in/reader036/viewer/2022063009/5fc0e2ba6410837be32d64dc/html5/thumbnails/1.jpg)
Mike Johns, PhD
Toxicology Consultant to
San Diego Unified Port District
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Sufficiency of DTR
• RWQCB considered information typical to sediment investigations
• Analysis is consistent with acceptable practice• Would do some analysis differently
– Fisher exposure includes catching fish outside site – Consider inclusion of additional polygon– Additional analysis of another polygon
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Beneficial Uses
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Exposure pathway conceptual model
Water
Sediment
Spotted Sand Bass FisherShipyard Site
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Shipyard sediment concentrations are high
Copper
Tributyltin
Mercury
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Shipyard chemicals can accumulate in aquatic animals
HPAH
Tributyltin
Mercury
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Fish tissue concentrations exceed concentrations in reference fish
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Cumulative Pe
rcen
tile by
Site
Total Homologs (ww)
whole body
Southwest
NASSCO
Reference
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Spotted sand bass
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Fisher interactions
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Sediment re‐suspension with engine testing and docking
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Polygon SW 29
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Rank of SW 29
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SW02 SW04 SW21 SW08 SW28 SW29 SW20 SW01 SW05 SW23 NA19
Total PCB
(µg/kg)
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Incremental cleanups are important to preserving beneficial uses of the Bay