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Public Domain Picture: November 13, 2012, Duwamish River, WA Sampling

Courtesy: US Environmental Protection Agency
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November 13, 2012, Duwamish River, WA Sampling
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November 13, 2012, Duwamish River, WA Sampling
Due to the river contamination, divers returning to the boat must undergo thorough rinsing with potable water. EPA divers recently demonstrated a passive sampling technique targetting 'pore water' in the Duwamish River, Washington. Pore Water is defined as: 'the water occupying the spaces between sediment particles ... Contaminants in the interstitial water and in the solid phase are expected to be at thermodynamic equilibrium. This makes interstitial waters useful for assessing contaminant levels and associated toxicity.' - U.S. Environmental Protection Agency, 2001 We also know that pore water can be related to fish tissue data, so sampling in this manner can be very useful in assessing a site cleanup. EPA divers have deployed a variety of passive samplers to support Superfund work. This technique has the capability of integrating data over a longer period of time--making it more likely that a contaminated groundwater plume discharging to a river like this one will be captured, where other techniques may only produce a snapshot. Lower Duwamish Waterway Superfund Site
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US Environmental Protection Agency

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External Site: US Environmental Protection Agency
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