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19 July 2021 <br />Project No. 02-0926 <br />Page 2 of 2 <br />Prior to well destruction activities, all wells will be checked for total depth and well integrity <br />using a Solinst water level meter. Any obstructions found in the wells will be removed. <br /> <br />AGI proposes to destroy wells MW-1, MW-2, MW-5, MW-6, VW-1 through VW-3, IAS-1, <br />and IAS-2 by over drilling. The wells will be drilled-out to a total depth of 35 feet bsg (VW- <br />1 through VW-3), 55 feet below surface grade (bsg, MW-1, MW-2, MW-5, IAS-1, and IAS- <br />2), and 75 feet bsg (MW-6) utilizing a hollow-stem auger drill rig equipped with 8 and <br />10-inch diameter augers. All original well construction materials will be removed (including <br />well casing, screen, filter pack, and annular seal) by the drill rig to ensure that no residual <br />contamination is sealed within the abandoned borehole and a vertical conduit does not <br />remain. The boring will be completely backfilled to surface grade with a cement grout <br />mixture (Portland type II) and finished at the surface with native soil or concrete to match <br />the existing surface. The grout mixture will consist of a ratio of not more than six gallons <br />of water for every 94-pound sack of Portland type II cement. The drill rig hollow stem <br />augers will be utilized as a tremie pipe during deployment of the grout mixture. Any <br />groundwater displaced by the grout mixture will be routed into properly labeled <br />Department of Transportation (DOT)-approved 55-gallon drums. All investigation derived <br />waste will be containerized in properly labeled DOT-approved 55-gallon drums and <br />disposed as a non-hazardous waste. <br /> <br /> <br />3.0. REPORTING <br /> <br />Upon completion of field work and disposal of waste, a soil sampling and well destruction <br />report describing the activities and procedures, including documentation of waste <br />disposal, will be prepared, and submitted to the SJCEHD. The report will be in a format <br />acceptable to the SJEHD and will be reviewed and signed by a California Professional <br />Geologist. <br /> <br /> <br />Sincerely, <br /> <br />AdvancedGeo, Inc. <br /> <br /> <br /> <br />______________________________ ___________________________ <br />Evan J. Schmidt Daniel J. Villanueva <br />Staff Geologist Senior Geologist <br /> <br />