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September 30, 2015 Monitoring Well Abandonment and Installation Workplan the vicinity of overhead power lines,the power to the lines must be shut off or the equipment must be positioned and blocked such that no part,including cables can come within the minimum clearances of the lines.All well sites will be inspected by the driller prior to locating the rig to ensure a stable surface exists. 2. Monitoring Well Abandonment Two existing monitoring wells are proposed for abandonment.The principal objective of destroying and sealing wells is to restore,as far as possible,the original (natural) hydrogeologic conditions that protect groundwater.The following general procedure will be employed to abandon and seal the monitoring wells that are approved for abandonment. Per San Joaquin County Well Standards,monitoring wells will be destroyed by a C-57 licensed contractor under the direction of a California Registered Professional Engineer, California Professional Geologist,or a California Certified Engineering Geologist.All work shall be performed in accordance with San Joaquin County Well Standards.After receiving approval from RWQCB staff,the following requirements pertaining to abandoning monitoring wells will occur. • Obtain well destruction permits from the San Joaquin County Environmental Health Department(SJCEHD). • Schedule well destruction inspections with the County and perform all sealing operations in the presence of a County inspector,unless directed otherwise by the County. • Before destruction,sound well to determine whether there are obstructions that could interfere with filling and sealing.Obstructions found in the well or boring shall be removed before filling and sealing operations begin. • The wells shall be destroyed by removing all material within the original borehole including the well casing,screen,filter pack and annular seal. Material to be extracted from the original borehole will be removed by means of drilling,including over-drilling if necessary.The excavated well boring shall be filled with sealing materials by use of a tremie pipe or equivalent,proceeding upward from the bottom of the well or boring.Sealing materials shall be placed in one continuous operation, and the pressure required for the placement of sealing material shall be maintained long enough for sealing materials to properly set If site conditions do not allow for full removal of all material,the well casing will be left in place during sealing operations.A hole at least one foot larger in diameter than the originally drilled hale shall be excavated around the outside of the well casing to a depth of three feet below the ground surface,and the well casing shall then be cut off six inches above the bottom of this excavation and removed.The HydroFocus, Inc. 5