We monitor a petroleum plume beneath the Ione Airport Kwik Stop on State Route 31 south of Ione in Pend Oreille County. We conduct quarterly groundwater monitoring from 26 monitoring wells and seven domestic wells in the area. Because the Kwik Stop is near multiple domestic water supply wells, this site is a priority for the monitoring and remediation of contaminated groundwater beneath the site.
A priority site for remediation
The Ione Airport Kwik Stop site is located on the northwest corner of the intersection of State Route 31 and Greenhouse and Dewitt roads, south of Ione. Site characterization, remedial investigation, and groundwater monitoring efforts indicate a plume of petroleum-contaminated groundwater (gasoline) is present in the shallow, unconfined aquifer beneath the site. It extends from the Airport Kwik Stop property, downgradient to undeveloped property in the vicinity of the former Cabin Grill Restaurant property.
In November 2012, we installed a soil vapor extraction system at the Airport Kwik Stop as an interim action to address petroleum contamination in the soil and to reduce potential threats to nearby domestic wells and the Pend Oreille River. A second soil vapor extraction unit was installed near the Cabin Grill in 2016.
We collect samples quarterly from 26 groundwater monitoring wells and seven domestic wells. All field and laboratory analytical data will be used to evaluate groundwater conditions and support decisions about the need for future remedial action under the Model Toxics Control Act.
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Addendum to Quality Assurance Project Plan: Ione Airport Kwik Stop Groundwater Monitoring describes the study plan.