From Department of Ecology: There is not an ongoing requirement for groundwater monitoring at the Site. The Consent Decree (CD) and Clean-up Action Plan (CAP) original groundwater monitoring plan required monitoring in 2009-10, which was completed, and then as part of the approval of deferred industrial maintenance work at the Site, additional monitoring was conducted in 2012. The 2009 groundwater monitoring plan – supplemental to the Compliance Monitoring Plan (CMP) – only required two semi-annual rounds of compliance monitoring.
Of the three types of compliance monitoring: protection, performance, and confirmational monitoring – it appears that all have been met at the site. Cleanup work is completed so no need for protection monitoring. Monitoring shows the cleanup levels are met at the Conditional Points of Compliance (CPOC) – so performance monitoring is completed. For confirmational monitoring, the plan required monitoring into 2009-10 which has been completed. Also long term monitoring under a compliance monitoring plan is only required until site cleanup levels are met (which appears to be the case at this site).
We (DOE) looked over the CD requirements for the periodic review at the Kenmore Industrial Park Site. The CD has a “Five Year Review” provision which doesn’t require any action other than upon request (by either Ecology or Pioneer Towing) the parties will meet and discuss site status every five years. Ecology could require additional remedial actions (i.e., groundwater monitoring) if necessary to protect human health or the environment.
DOE could require more sampling if it is required to conduct a periodic review. This would be outside of the CMP requirement, and would instead be under WAC 173-340-420(3). Ecology would need to evaluate why another round of groundwater data is necessary for the periodic review. It does not appear that there is any indication that the site is no longer meeting CULs in groundwater at the CPOC. The site appears to have been in compliance at the groundwater CPOC since 2009. Ecology is continuing periodic review because there is an institutional control at the site – so in the review Ecology is checking the effectiveness of the completed cleanup action and the effectiveness of the institutional controls. Groundwater monitoring may not be necessary to judge the effectiveness of the cleanup action since Ecology understands that it has met CUL over 10 years ago.