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Geosynteco' <br />consultants <br />• Geosyntec will obtain all necessary access agreements from property <br />owners/tenants as needed; and <br />• The Health and Safety Plan (HASP) will be updated and available on -Site during <br />all field activities. A copy of the HASP is included in Appendix A. Prior to the <br />start of field activities, a safety tailgate meeting will be conducted. <br />5.2 Destruction of Wells <br />The well destructions will be conducted by a C-57 licensed drilling contractor working <br />under the supervision of a California licensed professional geologist. <br />The screened interval and filter pack of each well to be destroyed will be removed via <br />shot perforation and the boring backfilled with Portland cement grout to 5 feet below <br />ground surface (bgs) under inspection by SJCEHD. The well box will be removed and <br />the upper 5 feet will be over drilled using the hollow stem auger (HSA) drilling method' <br />with an auger diameter equal to or greater than the original well borehole. In accordance <br />with the California Well Standards, the top 5 feet bgs will be backfilled with native soil <br />(California Department of Water Resources [DWR], 1991). The surface will be patched <br />to match the surrounding area (i.e., soil, concrete, or hot patch asphalt). <br />Alternatively, if destruction via shot perforation is not possible for any reason (i.e., <br />contractor availability, scheduling, use restriction), well materials may be removed by <br />over drilling the well to total depth via HSA with an auger diameter equal to or greater <br />than the original well borehole. Once the well materials have been removed, the borehole <br />will be tremie grouted with Portland cement grout from the bottom of the borehole to 5 <br />feet bgs under inspection by SJCEHD. The top 5 feet will be backfilled with native soil <br />and the surface patched to match the surrounding area. <br />Vadose zone wells will be destroyed by pressure grouting, over drilling the upper 5 feet, <br />backfilling with native soil, and patching the surface to match the surrounding area. <br />The soil cuttings and well casing removed from the ground as part of the well destruction <br />activities will be temporarily stored in drums or bins, the soil cuttings will be sampled <br />t CVRWQCB will be notified if an alternative drilling method will be used. <br />Well Destruction Work Am 5 June 27, 2023 <br />