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• 0, <br /> Environmental Health Department, San Joaquin County 5044.5.001.01 <br /> Monitoring Well Abandonment July 5, 2006 <br /> WORK PLAN FOR MONITORING WELL ABANDONMENT Page 2 <br /> SCOPE OF SERVICES <br /> Our proposed scope includes drilling out the existing well and grouting the subsequent borehole. <br /> We will coordinate with a licensed drilling contractor to over-bore the well to a depth of <br /> approximately 25 feet bgs, or the bottom of the previous boring, whichever is deeper. Drilling <br /> will be accomplished using a truck-mounted hollow stem auger drill rig equipped with 8-inch <br /> diameter augers in order to remove the annular seal around the well. Given that the subsurface <br /> material is not suspected to be contaminated, drilling cuttings will be discharged on the ground <br /> surface near the well. <br /> Once the well has been adequately removed the borehole will be grouted with neat cement by <br /> tremie method to 5 feet bgs. Bentonite pellets will be placed in the remaining five feet to the <br /> ground surface. Bentonite pellets will be adequately hydrated. <br /> SCHEDULE <br /> The proposed well destruction is tentatively scheduled to be conducted on July 17, 2006, pending <br /> approval of this work plan. <br /> If you have any questions on any portion of this work plan, please call and we will be glad to <br /> discuss them with you. <br /> Very truly yours, <br /> ENGEO INCORPORATED Reviewed by: <br /> 1 <br /> Richard Gand fo Duncan Hickmott, C.E.G. <br />