Chelan County Fire District 1

In 2017, Ecology determined that no further action was required at the site and the site was removed from the Hazardous Sites List.

The site formerly consisted of a county operated fire station, sheriff’s helicopter hanger, a fire tower, and a county yard. The helicopter hanger is no longer in use. In January 1995, two underground storage tanks (USTs) were decommissioned and removed from the site. The USTs consisted of one 500-gallon diesel tank and one 1000-gallon gasoline tank.  A site visit made in May 2007 confirmed that the site was almost completely paved with concrete.
 
After a Site Hazard Assessment conducted in 2007, the Site was ranked a “5” on the Hazardous Sites List.  The Hazardous Sites List is a statewide list of contaminated properties.  Sites can be ranked from a “1” to “5”.  A rank of “1” is the highest level of environmental concern compared to other sites on the List, and a rank of “5” is the lowest.

During tank removal and excavation, soil samples were taken from the excavation sidewalls, below the UST's, and beneath the dispenser island location. One of the samples taken near the dispenser had a concentration of 1500 mg/kg TPH-D, which exceeded the Model Toxics Control Act (MTCA) Method A cleanup level in existence in 1995.
 
Based upon field screening results, soil was excavated soil from the area of the fuel dispenser in addition to soil excavated from the UST area for a total of about 60 cubic yards. Complete excavation of the potentially impacted soil was not accomplished because additional soil removal would have endangered the fire tower structure.
 
Upon completion of remedial activities, the excavation was filled with imported soil. Soil samples from the stockpiled excavated soil were analyzed for diesel and gasoline range hydrocarbons. One of the samples showed diesel concentrations above the MTCA Method A cleanup level of2000 mg/kg. All other parameters were below MTCA Method A cleanup levels. The stockpiled soil was completely removed from the site and disposed at the Greater Wenatchee Regional Landfill.
 
Additional soil samples were collected to characterize the final remedial excavation. The samples were analyzed by for gasoline and diesel range hydrocarbons. Only one sample exceeded the MTCA Method A cleanup level for diesel.  

In 2016, Ecology hired a contractor to do some additional testing of soil and groundwater at the fire station. Our updated sampling did not detect contamination in site soil or groundwater at levels above state cleanup standards.