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Work Plan for Shallow Soil Assessment and Proposed Well Sampling Schedule Modification <br />Stockton Charter Way Commingled Plume #CP0057 <br />February 17, 2023 <br />4.2 PROPOSED WELL DESTRUCTION <br />With CRWQCB-CVR approval, wells AMW-5, DMW-6, DMW-8, DMW-9, and DMW-15 will be <br />properly destroyed under permit from the SJCEHD. <br />4.2.1 Health and Safety <br />Stantec will generate a site-specific HASP or equivalent RMS -1 for the proposed scope of work as <br />required by the OSHA Standard "Hazardous Waste Operations and Emergency Response" <br />guidelines (29 CFR 1910.120). The document will be reviewed and signed by all onsite consulting <br />personnel and subcontractors prior to performing work at the site. <br />4.2.2 Permitting and Utility Clearance <br />Prior to conducting subsurface work, well destruction permits will be obtained from SJCEHD, and <br />USA will be contacted to delineate subsurface utilities near the well locations with surface <br />markings. A private utility locator service will be contracted to clear the area. <br />4.2.3 Well Destruction <br />A licensed drilling company will complete the well destruction activities following all relevant <br />sections in the California Well Standards, Bulletin 74-90. <br />Prior to performing destruction activities, each well will be air -knifed to a minimum depth of five <br />feet below ground surface with a 110% borehole diameter to confirm there are no underground <br />utilities or other obstructions that would pose a risk to safe drilling operations. If utilities or <br />obstructions are encountered, a request for variance to pressure grout the well will be submitted <br />to SJCEHD for approval. Otherwise, hollow stem augers will be used to overdrill the well casings <br />to total depth and remove all well materials. Once the well materials have been removed, each <br />well location will be grouted with neat cement from total depth to grade using a tremie pipe <br />system. If groundwater is expelled during the grouting process, it will be properly contained, <br />characterized, and disposed. Former well locations will be completed with concrete at the <br />surface or appropriate materials to match existing grade. <br />4.2.4 Waste Handling and Disposal <br />Waste generated during the well destruction activities will be stored on -Site in Department of <br />Transportation -approved 55 -gallon drums pending the results of laboratory analyses. Analytical <br />results will be used for waste profiling and disposal. After profiling, all waste will be transported <br />and disposed of at an appropriate State -certified disposal facility. <br />4.2.5 Reporting <br />A report summarizing the well destruction activities will be prepared and submitted to the <br />CRWQCB-CVR. The report will be uploaded to GeoTracker. <br />® Stantec 9 <br />