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Geosyntec O <br /> consultants <br /> zone is where ISCO has been or is proposed to be applied. If the well is located <br /> within the remedy footprint it must satisfy at least one of the criteria listed under <br /> Criteria 1 (a,b, or c)to continue being evaluated for destruction. <br /> 4. Is the well needed to evaluate remedy performance? - This criterion evaluates <br /> whether the well allows for assessment of remedial performance for COCs and/or <br /> hexavalent chromium. <br /> 5. Does the well provide groundwater flow information relevant to the remedy? - <br /> This criterion evaluates whether the data from the well allows evaluation of <br /> groundwater flow direction and gradients within the treatment zone, and overall <br /> Site background as part of the remedial performance assessment process. <br /> 6. Will destruction of the well impact nearby well(s)used for remedy assessment?— <br /> This criterion evaluates whether the well destruction activities could potentially <br /> damage nearby wells (i.e., nested or co-located well pairs). <br /> Based on the Decision Tree, 40 wells have been identified and are being proposed for <br /> destruction at this time(Table 2 and Figure 2). Well construction specifications for these <br /> wells are provided in Table 1. In the future,as the remedy progresses and additional wells <br /> satisfy the aforementioned criteria, the Trust plans to propose additional wells for <br /> destruction. The following sections describe the pre-field and field activities for well <br /> destruction. <br /> 5. FIELD WORK ACTIVITIES <br /> 5.1 Pre-field activities <br /> Prior to the start of field activities, Geosyntec will perform the following: <br /> • Geosyntec will contact Underground Service Alert(USA)a minimum of 48 hours <br /> prior to commencement of digging or drilling activities; <br /> • Geosyntec will obtain well destruction permits from the San Joaquin County <br /> Environmental Health Department (SJCEHD). If destruction via shot perforation <br /> will be implemented, explosive use permits will be acquired by the contractor; <br /> • Geosyntec will obtain encroachment permits from San Joaquin County or the City <br /> of Stockton if working in the public right of way is required; <br /> Well Destruction Work Plan 4 June 27,2023 <br />