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Mr. Jeff Wong San Joaquin County Environmental Health Department May 8, 2023 Page 5 • TPHg by EPA Method 8015M; • TPHmo by EPA Method 8015M; • Semi -VOCs by EPA Method 8270C; • PCBs by EPA Method 8082; and • LUFT 5 Metals (cadmium, chromium, lead, nickel, and zinc) using EPA Method 6010. Following evaluation of disposal options, the water will be hauled off-site to an appropriately licensed disposal facility. A copy of the disposal manifest or bill of lading will be included in RDM's well destruction report. Construction debris (asphalt, concrete and well boxes) generated during the well destructions will be hauled to a local recycling facility or landfill for disposal. Reporting Following completion of the work, RDM will submit a results report to the CVRWQCB to document that well destructions and disposal of any investigation -derived waste were completed so that the site can be granted "final" closure. In addition, DWR Well Completion Reports (DWR Form 188) will be submitted to the DWR and SJCEHD for each destroyed well. Schedule The proposed scope of work will be initiated within 30 days of receiving the CVRWQCB's written approval of this work plan and the SJCEHD's issuance of the drilling permits. RDM will submit a report summarizing the well destruction and site restoration activities to the CVRWQCB and the SJCEHD (if requested), and RDM or the driller will prepare and submit the DWR well completion reports to the SJCEHD and the DWR within 45 days following completion of the work. Remarks/Signatures The interpretations contained in this document represent our professional opinions, and are based in part, on information supplied by the client. These opinions are based on currently available information and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended.