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San Joaquin County Environmental Health Department 5044.411.102 <br /> Monitor Well Destruction(MWR-1 and MWR-2) November 5,2014 <br /> WORK PLAN FOR WELL ABANDONMENT Page 2 <br /> San Joaquin County records indicate that groundwater in the immediate vicinity of the site has <br /> no known contamination. <br /> SCOPE OF SERVICES <br /> The well destruction will include completely redrilling the wells to remove existing well materials <br /> and tremie backfilling the hole with neat cement under the observation of a San Joaquin County <br /> Environmental Health representative. <br /> We will coordinate with a licensed drilling contractor to over-drill the wells to a depth of <br /> approximately 20 feet bgs, or the bottom of the previous borings, whichever is deeper. Drilling <br /> will be accomplished using a truck-mounted hollow stem auger drill rig equipped with <br /> 8-inch-diameter augers in order to remove the annular seal around each well. Given that the <br /> subsurface material is not suspected to be contaminated, drilling cuttings will be discharged on <br /> the ground surface near each of the wells. <br /> Once the wells have been adequately removed, the boreholes will be grouted with neat cement <br /> by the tremie method to approximately 5 feet bgs. Hydrated bentonite pellets will be placed in <br /> the remaining five feet to the ground surface. <br /> SCHEDULE <br /> We plan to complete the well destruction by November 18, 2014 pending approval of this work <br /> plan and favorable weather. It is our understanding that because the parcels for MWR-1 and <br /> MWR-2 are owned by the same entity they may be covered under the same permit. <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 /> Sincerely, <br /> DRO�F� <br /> �vF��� FLgHF��o�J� <br /> ENGEO Incorporated No. HG 460 <br /> CERTIFIED <br /> * HYDROGEOLOGIST <br /> S Exp.7/31/2015 �Q <br /> Matthew E. Miller Brian Flaherty, CH G �gTFOF CA��F��� <br /> mem/bf/zc/ag/ <br /> Attachment: Site Plan <br /> Cc: Ms. Susan Dell'Osso,River Islands Development LLC <br /> Mr. Scott Armstrong, CVRWQCB <br /> Mr. Glenn Gebhardt, City of Lathrop <br />