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Work Plan for Destruction of Monitoring and Remediation Wells Larry's Auto—308 N.Grant St,Stockton CA Page 2 Standards Bulletins 74-81 and 74-90 published by the California Department of Water Resources. Copies of available well construction logs are included in Appendix B. 5.0 SITE PREPARATION The well locations will be marked with white paint and Underground Service Alert(USA)will be notified so that utilities can be located and marked at least 48 hours prior to drilling. Condor will prepare all permit applications for submittal to San Joaquin County Environmental Health Department (EHD) for the destruction of the wells. Condor will receive all permit applications prior to initiating any fieldwork. 6.0 FIELDWORK PREPARATION Prior to commencement of fieldwork, a tailgate safety meeting will be held,and a site-specific Health and Safety Plan (HASP, Appendix C) will be reviewed and signed by all field personnel. Well destruction activities will be performed under the supervision of a Condor geologist in accordance with the provisions of the EHD permits. 7.0 WELL DESTRUCTION METHODS Well destructions will be completed primarily with the aid of explosives in accordance with standard practice for the destruction of water wells with explosives.Six wells with logistical issues will be destroyed through pressure grouting in accordance to Section 13.17 of the San Joaquin County Well Standards' (County ordinance) and the California Well Standards Bulletins 74-81 and 74-90 published by the California Department of Water Resources'. Well destructions will be completed by V&W Drilling (C57-720904), under the direct supervision of Condor. Explosives will be handled by Tylor McMillan's Well Service, LLC. Copies of the well blasting supporting documentation, including standard operating procedures (SOPS) for well destructions with the aid of explosives,well blasting safety plan, and certifications of the well blaster, are included in Appendix D. 7.1 GROUTING WITH THE AID OF EXPLOSIVES Seventeen(17) monitoring and remediation wells will be destroyed by emplacing neat cement grout into the well with the aid of explosives. A 25-grain per foot detonation cord will be placed within each well column from the bottom of the respective well to the bottom of the sanitary seal.Neat cement grout will be placed in one continuous operation, if possible, and once the grout has been allowed to reach the surface, the charges will be set off,allowing the blast to perforate the well casing from the sanitary seal to the total depth.The volume of neat cement grout will be recorded for each well. The well boxes will be removed and each well will be over drilled to approximately 5.0 feet bgs and the PVC casing will be destroyed.Additional grout slurry will be placed to cap the boring to within 0.5 to 1.0 foot bgs and the existing surface conditions will be restored.A summary of the monitoring and remediation wells that are subject to destruction with the aid of explosives and their construction details are included in Table 1, below. ' San Joaquin County Environmental Health Department, Well Standards,Section 13.17. 'California Department of Water Resources(D)AIR),Bulletin 74-81: California Well Standards—State of California Water Well Standards,Sacramento,California. Is to CONDOR