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River Islands Development LLC <br />River Islands Stage 2B — Monitoring Well MWR-8 <br />WORK PLAN FOR WELL ABANDONMENT <br />5044.411.104 <br />July 10, 2017 <br />Page 2 <br />SCOPE OF SERVICES <br />The well destruction will include completely overdrilling the well 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 overdrill the well to a depth of <br />approximately 20 feet bgs, or the bottom of the previous borings, whichever is deeper. Drilling will <br />be accomplished using a truck-mounted hollow stem auger drill rig equipped with 8-inch-diameter <br />augers in order to remove the annular seal around the well. Given that the subsurface material is <br />not suspected to be contaminated, drilling cuttings will be discharged on the ground surface near <br />the well. <br />Once the well has been adequately removed, the borehole will be grouted with neat cement by <br />the tremie method to approximately 5 feet bgs. Hydrated bentonite pellets will be placed in the <br />remaining five feet to the ground surface. <br />We plan to complete the well destruction by July 21, 2017, pending approval of this work plan. <br />In addition, it is our understanding that a replacement well will be constructed within Phase 1 of <br />the River Islands Development. The specific location and specifications for the well will be <br />provided at a future time. <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 />ENGEO Incorporated <br />Ana Lua <br />Z Crawford, CEG <br />49 <br />Q 1-1-J -rr:C <br />(_) 11 <br />o <br />.:Ho <br />...00.11111110, <br />\-\\( DRO <br />Zsr <br />No. HG 413 <br />c A \-\ <br />,\G\NEER/ <br />0 A. C',94 <br />No. 2523 <br />awn Munger, CHG <br />al zac/sm/bvv <br />cAo <br />Attachment: Site Plan <br />Cc: Mr. Steven Shih, San Joaquin County Environmental Health Department <br />Mr. Scott Armstrong, CVRWQCB <br />Mr. Glenn Gebhardt, City of Lathrop