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. 1 3.2 Well Destruction Activities Task 4: Well Abandonment. All field procedures will be overseen by Muir or under the supervision of a California Professional Geologist.The RWQCB and the SJCEHD will be property informed prior to the implementation of any abandonment activities proposed in the work plan. Soil Gas Well and Soil Gas Sampling Point Destructions: The seventeen shallow soil gas wells and sample points depicted on Figure 7 will have traffic boxes,cement and sand removed from the subsurface by jackhammer. After all well construction material is removed from the subsurface, each soil gas well or sample point will have all well or sample point soil and construction material removed by hand augur and/or jack hammer to total depth as shown in Table 1. The depth of each boring will be measured and recorded. A grout mix description will be obtained from SJCEHD and will be described in detail within the well abandonment permit applications prepared by the C57 water well contractor. The C57 water well contractor will conduct the grout placement within each boring under the oversight of the SJCEHD onsite inspectors. All debris will be placed in a 55-gallon USDOT drums pending determination for disposal. Groundwater Monitoring Well Destructions: The three groundwater monitoring wells(LA- MW 1,MW2 and MW4 will have traffic boxes removed. The explosives contractor will evaluate each wellbore log and other information in order to determine the preferential location and size of the explosive charges to place in each wellbore. After the charge has been placed in the monitoring well by the blaster the C57 well contractor will fill the well casing using a tremie pipe with the grout mixture described above. After the well bore has been filled with grout the explosives contractor will initiate the shot in accordance with the Blasting Safety Plan and the explosives operation permit. The wellbore will be filled with additional grout until the onsite SJCEHD inspector is satisfied that no additional grout mix is necessary. All investigative derived material will be removed from the site and placed in 55-gallon USDOT drums pending disposal evaluation. 3.3 Reporting Task 5: Reporting: A California Department of Water Resources(DWR)Well Completion Report(WCR)Form 188-electronic for each of the monitoring wells will be prepared by the C57 drilling contractor and filed with the DWR. Copies of the Form 188 logs will be provided as part of a Report of Well Destruction that will be prepared by the Consultant and submitted to the RWQCB and SJCEHD for review and approval. The Report of Well Destruction will be uploaded onto the SWRCB Geotracker website. It is anticipated that after all investigative derived waste has been property disposed of and the RWQCB and SJCEHD have reviewed and approved of the Report of Well Destruction that the Leaking Underground Storage Tank Case on the site will be formally closed. Lodi Airport Well Destruction Work Plan\10272020.wpd 5