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Geosynteco' <br />consultants <br />an environmental insurance policy. The insurance policy sunsets on July 1, 2030. <br />Consequently, the Trust is implementing remediation at the Site in a proactive manner <br />with the goal of completing active remediation by 2028 to support Site closure by the <br />policy sunset date. The well destruction activities described in this Work Plan are <br />proposed to meet this timeline by implementing decommissioning efforts, as reasonable, <br />in a stepwise manner leading up to the policy sunset date. <br />Groundwater monitoring at the Site is conducted under two existing programs that <br />complement each other: 1) the Sitewide Groundwater Monitoring Plan (GWMP, ERM, <br />2015) and 2) the CVRWQCB Waste Discharge Requirements (WDR) for In -Situ <br />Groundwater Remediation and Discharge of Treated Groundwater to Land Order No. R5 <br />2016 0012 013 Monitoring and Reporting Program (MRP), revised August 22, 2016 <br />(CVRWQCB, 2016); December 22, 2020 (CVRWQCB, 2020); and May 30, 2022 <br />(CVRWQCB, 2022). The GWMP is used to monitor changes in groundwater elevation <br />and contaminant concentrations and the WDR monitoring program is intended to evaluate <br />performance and the effectiveness of the current remedy and verify that no adverse <br />groundwater impacts occur due to in situ chemical oxidation (ISCO) treatment, in <br />accordance with the WDR permit. <br />There are over 100 piezometers, groundwater monitoring, extraction, and injection, and <br />other types of wells that have historically been used to support implementation of various <br />phases of soil and groundwater remedial action and performance assessment at the Site. <br />In alignment with advancing the Site towards completion of the current groundwater <br />remedy and eventual decommissioning of remedial infrastructure, the Trost is proposing <br />to iteratively decommission wells present at the Site that no longer provide benefit in <br />performing or assessing the remedy (Table 1 and Figure 1). <br />To inform the selection of wells for destruction, a Well Destruction Decision Tree <br />(Decision Tree; Figure 2) was developed based on the monitoring reduction criteria <br />presented in the 2020 Request (Appendix A). The Decision Tree is intended to provide a <br />framework for destruction of all types of Site wells in the future, as the remedy progresses <br />and meets the remedial objectives described in the Site Response Plan. <br />Well Destruction Work Am 2 June 27, 2023 <br />