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S <br /> Work Plan for Well Closure at Clover Middle School and Tracy High5!School Page Three <br /> 'I <br /> ❑ A licensed explosives expert will be brought to the job!site to perforate the casing <br /> from 50 feet to the surface. This perforation will be atone foot intervals and will <br /> spiral around the casing. Explosive charges will be used to perforate the casing. This <br /> approach was selected to avoid the possibility of entanglement of a mechanical <br /> perforator in this old casing which may be partially deteriorated and may tear and <br /> entangle any mechanical perforation tool. The City of-Tracy Fire Department will be <br /> contacted to notify them of the time of the perforation.s <br /> ❑ The well will be grouted with a two sack sand slurry grout tremied to the bottom of <br /> the well. This two sack mix will be used to fill the voids at the bottom and up the <br /> casing to 50 feet below ground surface. A ready mix diuck and portable pumper will <br /> be used to pump the grout into the tremie. A work-over drill rig will be used to lower <br /> the tremie during this grouting operation. At 50 feet below ground surface the grout <br /> mixture will be changed to a six sack sand slurry grout',:' This will be carried to the <br /> surface. <br /> At Clover Middle School it is not practical to remove the top 5 feet of the casing <br /> since it is inside a building and would require demolition of the building and <br /> surrounding paving to remove the top 5 feet of casing. : <br /> I <br /> ❑ The grouted well will be inspected by the County and closure of each well obtained. <br /> i <br /> j <br /> { I <br /> }# I <br /> 1� <br /> { <br /> E <br /> f <br /> i <br /> IE <br /> k <br /> I <br /> i <br /> F� <br /> i� <br /> i� <br /> fj <br />