Laserfiche WebLink
Geosynteco' <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 />1� W 1 3111 MIATI) 9 "WIT8110IN I I I <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 Am 4 June 27, 2023 <br />