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Comment Period

Pacific Car & Foundry Co

Cleanup Site Periodic Review

Aug. 26, 2021 - Sept. 24, 2021, 11:59 p.m.

You are invited to review and comment on a periodic review report for the Pacific Car & Foundry Co cleanup site in Renton.

The Pacific Car & Foundry Co site is in the City of Renton, about 1/2 mile northeast of the downtown area. The property is about 82 acres, bounded by Garden Avenue North, Houser Way North, North 4th Street, and North 8th Street. The northern 40 acres were initially remediated to allow construction of the Kenworth Truck Plant.  The truck plant began operations in 1993. The R&D Building was built in 2004 and the Parts Distribution Center was built in 2016. The contamination is from past industrial practices.

A periodic review is conducted every five years following a cleanup action when institutional controls are used as part of the remedy. The purpose of the periodic review is to evaluate current site conditions and to ensure continued protection of human health and the environment.

The 2021 Periodic Review concluded:

  • The cleanup appears to have significantly reduced impacts to groundwater, but arsenic and vinyl chloride have been found above groundwater cleanup levels in some compliance wells. Monitoring must continue as long as contaminants are present above groundwater cleanup levels. The cleanup action is considered an interim action until that condition is met. Therefore, the periodic review fails at this time. 
  • In two compliance wells Arsenic was at a high enough concentration to trigger additional assessment, as called for in the site’s cleanup contingency plan. This trigger point is called the “hot spot action level”.
  • Copper, hexavalent chromium, lead, and zinc have been above surface water cleanup levels some of the time in three stormwater sampling locations.  Monitoring must continue as long as contaminants are present above cleanup levels.  The cause of the elevated metals in stormwater needs to be evaluated per the Contingency Plan. 
  • The 1994 amended consent decree required PACCAR Inc. to record an amended Restrictive Covenant with the King County Auditor’s Office, but a recorded copy could not be found.  A recorded copy of the amended Restrictive Covenant needs to be provided to Ecology.

Additional details can be found in the 2021 Periodic Review report.

We will review comments received during the comment period and make recommendations for suggested changes. The periodic review will become final if no significant changes are made. An additional public comment period will be held if significant changes are made.

We will hold a public meeting if 10 people request one.

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Tamara Welty
15700 Dayton Ave N
Shoreline , WA 98133
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Tamara Welty
Periodic Review Coordinator

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