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Shell Mart McKenzie Automotive Groundwater Monitoring Results, April 2019: Data Summary Report

Publication number Date Published
21-03-002February 2021
VIEW NOW Shell Mart McKenzie Automotive Groundwater Monitoring Results, April 2019: Data Summary Report (Number of pages: 71) (Publication Size: 12501KB)

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Author(s) Carnes, J.
Description In March 1994, a petroleum release at Shell Mart McKenzie Automotive in Morton, Washington was reported to the Department of Ecology (Ecology). Ecology initiated an emergency response that included the removal of two underground tanks and some of the adjacent contaminated soil. Groundwater monitoring conducted in 1994 and 1996 confirmed the presence of petroleum hydrocarbons at concentrations exceeding applicable Model Toxics Control Act (MTCA) Method A cleanup levels in the shallow groundwater underlying the site.

In April 2019, Ecology collected samples from three monitoring wells at the site in order to assess current petroleum hydrocarbon concentrations in groundwater. Results from the 2019 monitoring show that contaminant concentrations have decreased to below the MTCA Method A cleanup levels. Benzene, toluene, ethylbenzene, and xylene (BTEX) compounds, and gasoline and diesel range petroleum hydrocarbons, were not detected in any of the sampled wells. Lead was detected in one well at a concentration of 0.67 µg/L, which is below the cleanup level of 15 µg/L.

These analytical results meet the measurement quality objectives described in the 2019 Quality Assurance Project Plan.
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Keywords BTEX, groundwater toxics, groundwater monitoring, petroleum hydrocarbons, lead
WATERSHED Water Resource Inventory Area 26 Cowlitz
DATA Environmental Information Management (EIM) #FS29172624


Quality Assurance Project Plan: Shell Mart McKenzie Automotive and Fargher Lake Grocery Groundwater Assessment Monitoring