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Maple Lane School

SITE DESCRIPTION

The Maple Lane School, a youth detention facility, is located at 20311 Old Highway 9 SW in Centralia. It is surrounded by mostly residential farmland and is just north of a wetland which connects to the Chehalis River.

A 6,000-gallon underground storage tank (UST) was installed in 1980 for use as a backup fuel source for school boilers. Evidence of a diesel range organic fuel leak was discovered in May 1997. Investigations revealed that approximately 1,200 gallons of fuel leaked from a hole in the tank between 1980 and 1997.  Soil and groundwater were contaminated in some areas above state cleanup standards.  Groundwater contamination did not move past the fenced area of the property.

Remedial actions at the site included:

• Underground tank was removed
• 40 cubic yards of contaminated soil was excavated
• Contaminated soil was stockpiled and treated on site
• Monitoring wells were installed
• Hydrogen peroxide was injected into the groundwater (via monitoring wells) to breakdown and reduce amount of contamination remaining in groundwater.
• Soil and groundwater monitoring for 10 years
• Monitored natural attenuation was used to manage remaining contamination on site after the tank and soil were removed (for more information, see the blue box to the right).

Site Documents

February 26, 2009

• Fact Sheet
• Historical Information and Current Site Condition Summary
• Figure 1 - Site Location
• Figure 2 - Sample Locations
• Figure 3 - Project Timeline
• No Further Action Letter
  • Figure 1 - Site Location
  • Figure 2 - Site Plan
  • Figure 3 - Site Location

Related Information

• Watershed Information for WRIA 23

Additional Resources

• Acronyms used by the Toxic Cleanup Program
• Cleanup Process: Major Steps & Definitions
• Data Submittal Requirements for All Cleanup Sites
• Facility/Site Atlas
• Toxics Cleanup publications