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September 29,2014 Monitoring Well Abandonment and <br /> Installation Workplan <br /> through them is of little consequence.Suitable materials can include neat cement, <br /> sand-cement grout,and bentonite clay.Used drilling mud or cuttings from drilling <br /> shall not be used for any part of the sealing material.The sealing material used must <br /> be approved by RWQCB staff.Potable water shall be used for sealing mixtures. <br /> HydroFocus, Inc. 12 <br />