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k"oork Plan for Monitor Well Closure Pilkington North America Page 2 cement/bentonite (3-5%) grout. The grout will be injected into the monitoring well at a pressure of approximately thirty-five pounds per square inch. Once the grout is in place, the upper five feet of the well will be over-drilled and additional grout added. The grout will be allowed to mushroom at the top of the well and then will be leveled and brought to grade. The traffic box and any other refuse from the well destruction activities will be disposed of on-site in a manner that PNA elects. Grout volume calculations for the closure of monitoring wells MW-17 and MW-18 are shown in Table 1, below. The volume of grout is based on the diameter of the borehole and the PVC casing, the length of the PVC casing and filter pack, and an estimated filter pack porosity of 25%. Condor will prepare a brief monitoring well destruction report for submittal to the SJCEHD. The report will include a discussion of the field activities. A draft of the report will be presented to the property owner for approval prior to submittal of the final report. Upon approval of this Work Plan by the SJCEHD and the approval of the Client to proceed, the proposed fieldwork can be completed within approximately two to four weeks. A report can be submitted within four weeks of the completed fieldwork. If.you have any questions or need additional information,please call us-at 209-234-0518. Respectfully submitted, CONDOR EARTH TECHNOLOGIES, INC. LX7 F f Casey Ki o� s� Nnald F.Kresse Staff Geologist NO. 30 California Registered Geologist#6430 Attachments: Figures 1 and 2 9� CA �,�©��' Well Destruction Permit Applica ion Grout Volume Calculations cc: Mr. Roger Bishop,Pilkington North America PA3000_pd\3151 Pilkinton PLOR3151J UST Review\Work Plan\MW Closure WorkPlan.doc �a CONDOR