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Title

Addendum to Quality Assurance Project Plan: May Creek Landfill Groundwater Assessment Monitoring

 
Publication number Date Published
20-03-116November 2020
VIEW NOW Addendum to Quality Assurance Project Plan: May Creek Landfill Groundwater Assessment Monitoring (Number of pages: 17) (Publication Size: 440KB)




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Author(s) Carnes, J.
Description The May Creek Landfill is an unpermitted solid waste landfill east of Renton. King County notified the Department of Ecology (Ecology) of potential contamination at the site in January 2003. In August 2003, Ecology placed the May Creek Landfill on the Confirmed and Suspected Contaminated Sites List. The site was listed as confirmed for metals in surface water and suspected for petroleum, antifreeze, metals, and gasoline in soil and groundwater. Groundwater samples previously collected by EPA and Ecology were analyzed for a wide range of contaminants detailed in the original QAPP, including PCB aroclors.

Ecology’s Toxics Cleanup Program has requested high resolution analysis of PCB congeners and dioxins/furans. Dioxins and furans are of concern in soil but are not expected to be detected in groundwater. However, there is potential for mobilization of dioxins due to co-solvency with petroleum products. Samples for PCB congener analysis will be collected from all seven monitoring wells. Samples for dioxins/furans analysis will be collected from upgradient well MW-01, and from wells MW-05 and MW-07, which are located in areas of the site where burning has apparently occurred.
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Contact Jacob Carnes at 360-407-6764 or CARJ461@ecy.wa.gov
Keywords groundwater toxics, groundwater monitoring, PCBs, dioxin
WATERSHED Water Resource Inventory Area 08 Cedar-Sammamish
DATA Environmental Information Management (EIM) #FS1292568

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Quality Assurance Project Plan: May Creek Landfill Groundwater Assessment Monitoring