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20 December 2023 AdvancedGeo <br /> Project No. 23-7573 CLIENT —ATTORNEY PRIVILEGE An Employee-Owned Company <br /> Page 4 of 4 <br /> analyzed for VOCs by EPA method TO-15 and helium (as tracer gas) by Modified ASTM <br /> D-1946. <br /> 2.3. BORING ABANDONMENT <br /> All soil borings will be permanently sealed to prevent vertical migration of potential <br /> contaminants. Soil borings shall be abandoned by backfilling with cement grout from the <br /> total depth to surface grade. The top three to six inches of the boring abandonments will <br /> be completed flush to surface grade with concrete or native material. <br /> 2.4. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water <br /> after being washed with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probe boring location. Any soil or water waste generated during <br /> field activities will be containerized in properly labeled DOT-approved drums and stored <br /> on-site in an area generally lacking public access. Disposal alternatives will be evaluated <br /> based on results of soil analysis. <br /> If you have any questions or require further information, please contact our office at <br /> (800) 511-9300. <br /> Sincerely, <br /> AdvancedGeo, Inc. <br /> Daniel J. Villanueva <br /> Senior Geologist <br /> y5,o''°: cFo <br /> °k� <br /> 4 0 <br /> a NO, 6749 <br /> Robert. D. Loeffle ° UtllF <br /> Senior Geologist <br /> California Professional Geologist No. 6709 <br />