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Mr.Jeffrey Wong,SJCEHD May 23,2023 <br /> Well Abandonment Work Plan 2129-1140-01 <br /> Former Knowles Station,Stockton,California <br /> Page 2 <br /> Pre-field Activities <br /> The following activities will be implemented: <br /> • Confirm well destruction schedule with a C-57 licensed drilling company, <br /> • Update the site-specific Health and Safety Plan, <br /> • Secure well destruction permits from SJCEHD, <br /> • Mark the proposed work locations, and <br /> • Notify Underground Service Alert, the property owner, and the SJCEHD of the <br /> scheduled field activities. <br /> Field Activities <br /> A Stratus representative will be on-site to direct completion of the work. A licensed well driller <br /> will destroy all of the Site's wells (MW-1, MW-2, MW-4, MW-9, MW-IOD, MW-11, MW-12, <br /> MW-13, IW-IA/B, IW-2A/B, IW-3A/B, and IW-4A/B) by filling the well casing with a neat <br /> cement slurry to the top of the casing via tremie pipe, then down-hole blasting —perforating the <br /> casing and screen with explosive charges placed from the bottom of each well to the depth of the <br /> uppermost seal(see Appendix A). Following destruction of the well casing,additional neat cement <br /> will be pumped into the borehole via tremie pipe until the grout level stabilizes within 5 feet of the <br /> top of the casing. The upper 5 feet of the well casing will then be drilled out using a solid flight <br /> auger, and the traffic-rated vault box covering the well will be removed. After drilling, additional <br /> neat cement will be placed on top of the remaining casing to "top off' the grout seal to surface <br /> grade. <br /> Waste Management <br /> Drill cuttings and wastewater generated during the well destruction activities will be contained in <br /> DOT-approved 55-gallon steel drums. The drums will be appropriately labeled and stored at the <br /> Site pending proper disposal. A licensed contractor will transport the soil and wastewater to an <br /> appropriate facility for disposal. <br /> Report Preparation <br /> A report will be prepared to document the well destruction work. The report will discuss the work <br /> activities completed, including Department of Water Resources well destruction notices for each <br /> well destroyed and documentation of any deviations from the original scope of work, if necessary. <br /> T:\Knowles Hammer\Well Destruction 2023\Pemrit Application\Well Abandonment Work Plan.docx STRATUS <br />