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February 22, 2018 Page 3 of 4 Reference: Remediation Well Destruction Work Plan 3.2 PERMITTING Well destruction permits will be obtained from SJCEHD prior to the commencement of field activities. No other agency permitting is anticipated for completion of the proposed work. 3.3 BOREHOLE CLEARANCE ACTIVITIES Stantec will mark the proposed locations with white paint, as required by law, and contact Underground Service Alert(USA)at least one day before a 48-hour review period,prior to the start of boring activities to notify all utility operators in the area to clear the marked locations.Additionally, a private utility location service will be hired to conduct a utility clearance of the area prior to the start of boring activities to minimize the potential that underground utilities or other subsurface structures might be encountered during the removal of concrete and well boxes at the near surface as part of the well destructions. 3.4 WELL DESTRUCTION ACTIVITIES Stantec will supervise a C-57 licensed well driller in the destruction of forty-five (45) wells at the Site (Figure 2).The wells will be destroyed in accordance to the California Water Well Standards(Bulletins 74- 81 and 74-go) and under the direct oversight and supervision of SJCEHD. The wells will be destroyed by pressure grouting each well from the surface, forcing grout into the minor amount of sand-pack that surrounds each injection well. Grout will be poured into each well,a connection made to the top of the well casing to allow for approximately 25 pounds of pressure to be applied, and then the well topped off with additional grout, as needed. Air knife and/or hand tools will be used to remove the upper few feet of well casing and the well boxes. The resulting hole will be backfilled to match the surrounding areas(dirt,concrete, etc.).The well boxes,removed well casing,and other debris will be contained and disposed of off-site. Pressure gouting of the remaining wells is preferred because it can be safetly and effectively done to properly destroy the remediation wells with the least amount of discturbance to the operating terminal facilities in the area. Additionally,many of the remaining wells are located in areas that will not allow access to the wells by a drill rig,or will not allow for the use of spinning augers in a manner that is safe for the driller or terminal personel in the area due to structures,utilities,pressurized product lines,etc.that have been constructed after the remediation wells were installed. All wells will be properly destroyed by pressure grouting methods in accordance to the California Water Well Standards with the oversight and approval of the SJCEHD,and by a C57 licensed driller. 3.5 WASTE DISPOSAL Soil cuttings, well materials, excess grout and decon rinsate, and any water generated during destruction activities will temporarily be stored onsite in properly labeled California Department of Transportation (DOT)-approved 55- gallon steel drums pending characterization and disposal. Waste materials will be sampled and waste characterization completed for each receiving facility. The drums will be removed by a certified waste contractor and transported to an approved facility for treatment/disposal. Design with community in mind