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Geosynteco' <br />consultants <br />Initial assessment of potential wells to be destroyed as part of this Work Plan began with <br />a review of the 2020 Request and general evaluation of the Site wide monitoring network. <br />Based on the assessment, the following well groups were preliminarily identified as <br />candidates for destruction: <br />• Wells previously identified for destruction in the 2020 Request; <br />• Piezometers located at the edge of the monitoring network; and <br />• Wells previously used for Enhanced Reduction Dechlorination (ERD) injections <br />completed in 2008, which are no longer used or monitored (LFR, 2008). <br />The wells were then evaluated based on the following criteria, as shown on Figure 2: <br />1. Is the well included in the MRP or GWMP? - If so, for the well to be considered <br />for destruction it must satisfy one of the following criteria to continue being <br />evaluated for destruction: <br />a. Is the well redundant (i.e., nearby well screened in the same zone <br />providing redundant data)? <br />b. Does the well exhibit stable or decreasing constituent of concern (COC) <br />trends at low concentrations or below the Maximum Contaminant Level <br />(MCL) for approximately 2 years? The well can additionally satisfy the <br />criteria if it is not routinely monitored for COCs (i.e., ERD wells or <br />piezometers). What constitutes "low" concentrations will be determined <br />on a per well basis. Compliance wells are not eligible for destruction under <br />this criterion. <br />c. Is the well damaged or fouled beyond repair? <br />2. Is the well needed to define the plume extent or boundary? - This criterion <br />evaluates whether the well is used for evaluating plume dynamics and is useful <br />for defining the plume boundary during active remediation. <br />3. Is the well located within the remedy footprint? — This criterion evaluates whether <br />the well is located within the current plume footprint, which is defined as any well <br />located within the treatment zone. Per the WDR-MRP guidance, the treatment <br />Well Destruction Work Am 3 June 27, 2023 <br />