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28 December 2020 AdvancedGeo <br /> Project No. 17-4073 An Employee-Owned Company <br /> Page 5 of 5 � <br /> The excavated borings of MW-2 and MW-7 will be completely backfilled to surface grade <br /> with a cement grout mixture (Portland type 11) and covered with either a concrete, asphalt, <br /> or native fill depending on the surrounding surface material. The grout mixture will consist <br /> of a ratio of six gallons water for every 94-pound sack of Portland type 11 cement. The drill <br /> rig hollow stem augers will be utilized as a tremie pipe installation of the grout seal. <br /> Waste generated during drilling and destruction activities will be containerized in properly <br /> labeled Department of Transportation (D.O.T.)-approved 55-gallon drums and stored <br /> on-site until proper disposal is arranged to a suitable non-hazardous waste facility. <br /> Additionally, soil cuttings, well materials and construction waste will be containerized in <br /> 10-yard soil bins until proper disposal is arranged to a suitable non-hazardous waste <br /> facility. <br /> 4.0. REPORTING <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 and RWQCB. The report will be <br /> in a format acceptable to the SJEHD and the RWQCB and will be reviewed and signed <br /> by a California Professional Geologist. <br />