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CV*ATC <br /> A S S O C I A T E S I N C <br /> ° For protection of the seal at the land surface, a hole at least two feet in diameter will be . <br /> excavated around the outside of each well casing to a depth of approximately two feet below <br /> ground surface. The sealing material used to seal the well will be allowed to spill over into the <br /> excavation. <br /> After the sealing material has set in wells MW1 through MW5, the excavations will be filled to <br /> within approximately 3 inches of surface grade with an aggregate material and the remaining 3 <br /> inches will be filled with asphalt patch to restore the site's appearance. <br /> Based upon well construction details and assuming the filter pack for each well has an estimated <br /> �. porosity of 25% (Heath, R. C., 1983), an estimated volume of approximately 91 gallons of grout <br /> will be used to abandon wells MW1 through MW5. Monitoring well construction data, soil <br /> boring logs, and grout volume calculations are attached. One permit application and associated <br /> fees (check no. 685) are attached. The application is,for the five on-site monitoring wells. <br /> Report Preparation <br /> 1 <br /> i Upon completion of the well destruction activities, a summary report will be prepared for <br /> submittal to San Joaquin County Environmental Health Department (SJCEHD). The report will <br /> include a description of all field activities. <br /> � 4 <br /> All work described in this workplan will be performed under the direction of a California <br /> Registered Professional Engineer. All work will be performed in accordance with ATC's Site <br /> Safety Plan and Quality Control/Quality Assurance Plan for this site, on file at SJCEHD. <br /> Projected Schedule_ <br /> ATC has tentatively scheduled field activities for September 2002. Once approval of this <br /> workplan has been received, ATC will confirm the schedule for drilling activities. ATC will <br /> notify SJCEHD at least 48 hours prior to beginning any field activities. The summary report will <br /> i - <br /> be submitted to SJCEHD approximately two weeks after the completion of field activities. <br /> i <br /> W AI 30991wp-wellabandonment.doc 2 <br /> t <br />