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Ron Gestler <br /> From: Tierney,Jeff@Waterboards <Jeff.Tierney@Waterboards.ca.gov> <br /> Sent: Thursday, July 7, 2022 3:31 PM <br /> To: Ron Gestler <br /> Cc: Smith, Roger; Waskom, Lisa P; Molly Dimick (Molly.Dimick@simplot.com); Casebeer, <br /> Nathan@Waterboards <br /> Subject: Re: Oxychem Stockton - VI Investigation Work Plan Addendum <br /> Attachments: OxyChem-Stockton_VI Invest. WP Addend um_7.1.2022.pdf <br /> CAUTION:This email originated from outside of the organization. Do not click links or open attachments unless you recognize the <br /> sender and know the content is safe. If you have any suspicion, please confirm with the sender verbally that this email is authentic. If <br /> you suspect fraud,click"Phish Alert Report." <br /> Hi Ron, <br /> Hope you had a nice Independence Day and extended weekend. <br /> Yes, I recall the letter and the indication in a recent monitoring report that soil gas sampling near MW-27 was <br /> planned to commence during the next groundwater monitoring event. I appreciate the initiative to plan the <br /> soil gas sampling, and the addendum to further describe the work. I understand the nested multi-depth soil <br /> vapor probes will be installed in a single borehole, and consistent with installation depths of the on-site soil <br /> vapor probes. Accordingly, I concur with the 1 July 2022 Work Plan for Vapor Intrusion Investigation <br /> Addendum. <br /> Unfortunately, I must make you aware of one error in the addendum -- I do not yet have a P.E. license, but <br /> rather an E.I.T. certificate. I'd appreciate if you could make that correction and submit the corrected <br /> addendum to GeoTracker. Please let me know if you have any questions. <br /> Best, <br /> J eff <br /> From: Ron Gestler<RGestler@Geosyntec.com> <br /> Sent: Friday,July 1, 2022 2:25 PM <br /> To:Tierney,Jeff @Waterboards<Jeff.Tierney@Waterboards.ca.gov> <br /> Cc: Smith, Roger<roger_smith@oxy.com>; Waskom, Lisa P<Lisa_Waskom@oxy.com>; Molly Dimick <br /> (Molly.Dimick@simplot.com) <Molly.Dimick@simplot.com> <br /> Subject: Oxychem Stockton -VI Investigation Work Plan Addendum <br /> EXTERNAL: <br /> Good afternoon,Jeff. I hope this email finds you well. I'm contacting you today to follow-up on the OxyChem-Stockton <br /> site and the recent VI investigation activities we've performed at the site. Please recall the Water Board's February 14, <br /> 2022 letter you sent to us, in which the Water Board requested that a soil gas sample be collected near to an off-site <br /> well (MW-27) in conjunction with the site's upcoming Q3-2022 routine groundwater monitoring event,which is planned <br /> to take place in mid-August. While that letter did not specifically ask us to update the Work Plan for VI Investigation <br /> (which we submitted to the Water Board in June 2021 and was subsequently approved), we have nevertheless prepared <br /> the attached Addendum to that Work Plan. This Addendum is necessary to obtain the required permitting from the San <br /> I <br />