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Additional Subsurface Investigation Work Plan <br />17 W Washington Street, Stockton, California <br />Laboratory analysis of soil gas samples will consist of the following: <br />x VOCs using EPA Testing Method TO-15. <br />x Helium by Testing Method ASTM D1946-90 <br />Estimated Schedule <br />Completion of this work is contingent upon receipt of a SJCEHD-approved drilling permit. The <br />field work will be scheduled upon receipt of the permit. The drilling will also be subject to drilling <br />contractor availability but is expected to occur within 1 to 2 weeks of permit issuance. <br />Closing <br />If there are any questions regarding this work plan, please do not hesitate to contact the <br />undersigned at (415) 876-8610, or nbutcher@aeiconsultants.com. <br />Sincerely, <br />AEI Consultants <br />Neill D. Butcher, P.E. <br />Senior Project Manager Exp. 6/30/2023 <br />AEI Consultants <br />2500 Camino Diablo <br />Walnut Creek, California 94597 <br />Phone: 925-746-6000 <br />Fax: 925-746-6099 <br />Attachments: <br />Figure 1, Site Location Map <br />Figure 2, Site Map <br />Health and Safety Plan <br />Neill D Butcher PE