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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | Wenatchee River PCB Source Assessment: Cashmere Reach Source Identification |
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| VIEW NOW |
Wenatchee River PCB Source Assessment: Cashmere Reach Source Identification (Number of pages: 104) (Publication Size: 11557KB)
Microsoft Excel format (Publication Size: 147KB)
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| Author(s) | W. Hobbs, D. Escobedo, and J. Carnes | ||||
| Description | Investigations into the sources of polychlorinated biphenyls (PCBs) impacting the biota of the Wenatchee River have been ongoing since 2014. Two chemically distinct sources of PCBs have been suspected in the lower Wenatchee River, one near the City of Cashmere and another near the confluence with the Columbia River. This study (August 2021 – June 2023) focused on follow-up investigations into a potential groundwater pathway for PCBs discharging into the Wenatchee River near Riverside Park in Cashmere. Instream piezometers in the side channel reach confirmed the discharge of PCB-contaminated groundwater into the river. Surface water samples at the point of discharge mostly resembled the technical mixture Aroclor 1254 and a congener profile indicative of microbial dechlorination. A storm catchment basin in the northeast corner of Riverside Park had a continuous discharge of water containing measurable PCBs. The source of water to the catch basin was groundwater infiltrating the park drainage system, groundwater used as irrigation water percolating through the former landfill area, and stormwater from the City of Cashmere. Biofilm samples along the side channel reach demonstrated the bioconcentration of PCBs from water to primary producers (algae). The congener profiles are consistent spatially in the surface waters and biofilms and were consistent with previous investigations, suggesting a consistent and continuous source. |
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| Contact | EAP Publications Coordinator at 564-669-3028 or EAPpubs@ecy.wa.gov | ||||
| Keywords | biofilm, polychlorinated biphenyls (PCBs), Wenatchee River, groundwater | ||||
| WEB PAGE | Toxics source assessments | ||||
| WATERSHED | Water Resource Inventory Area 45 Wenatchee | ||||
| DATA | Environmental Information Management (EIM) #WHOB002 |
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| RELATED PUBLICATIONS | Title:
Addendum 3 to Quality Assurance Project Plan: Wenatchee River PCB and DDT Source Assessment Wenatchee River PCB Source Assessment, 2016 and 2017 Wenatchee River PCB and DDT Source Assessment Quality Assurance Project Plan: Wenatchee River PCB and DDT Source Assessment |
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