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Final Site Investigation (SI) field investigations were completed in January 2018, with the results summarized in the February 28, 2018, SIR Amendment Addendum. The WDNR approved the completion of SI activities in a letter dated April 24, 2018. Results of second quarter groundwater sampling (April 2018) on monitoring wells MW-3 and MW-4 were subsequently submitted to WDNR in a report dated May 9, 2018. Third quarter groundwater sampling is scheduled for July 2018.
A Remedial Action Options Report/Design Report (April 2, 2018) and injection request (May 23, 2018) were submitted proposing the use of in-situ chemical oxidation as a remedial method to address Polynuclear aromatic hydrocarbon (PAH) contamination in the soil and groundwater within the area of a former heating oil UST behind 2410-2414B 10th Avenue tenant space (location of monitoring well MW-4). The proposed chemical injection was approved in a WDNR letter of June 27, 2018. Quarterly groundwater monitoring is continuing within the area of MW-3 (southern extent of the site).
The proposed chemical injection is scheduled for July 2018. The results of the injection and confirmation sampling, as well as the quarterly groundwater monitoring, will be used to determine future remedial actions, if necessary. The injection results will be reported to WDNR, and reporting will include information required by the July 7, 2018, NR140 exemption approval. DMR/s will be submitted as required under WPDES permit WI-0046566-07.
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