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Phone: (209) 937-8740 <br />richard.stifflerstocktonca.qov <br />From: Young, Holly@Waterboards <Holly.Young@Waterboards.ca.gov> <br />Sent: Wednesday, August 31, 2022 2:44 PM <br />To: Richard Stiffler <Richard.Stiffler@stocktonca.gov> <br />Cc: Murphy, John@Waterboards <John.Murphy@Waterboards.ca.gov> <br />Subject: City of Stockton Anderson Street and 1-5 Spill Next Steps <br />CAUTION: This email originated from outside the City of Stockton. Do not click any links or open attachments if this is unsolicited <br />email. <br />Hi Richard, <br />I spoke with Ryan Rodriguez at CA Fish & Wildlife, and he mentioned you had expressed some uncertainty to him <br />regarding what the next steps should be for the spill at the Anderson Street and 1-5 drainage channel. I wanted to reach <br />out to provide guidance as far as the Regional Water Board's expectations. <br />Since we now have soil sample data from the length of the drainage channel, as well as waste characterization samples <br />from removed soil and liquids, the next step is to establish the appropriate screening levels for the site. The results of <br />the samples collected from the channel should be compared to the screening level to determine if additional <br />rennediation is needed. If any of the detected compound concentrations in the soil samples exceed the screening level, <br />then additional rennediation will likely be needed. We suggest that the San Francisco Bay Region Terrestrial Habitat <br />Levels for Minimally Vegetated Areas be used for the soil screening level. Vince Blackwood from Apex reached out to <br />me last week asking for guidance, and I suggested a report be prepared with the analytical results and the results <br />compared to appropriate screening levels in that report. From there, a determination can be made if the channel <br />requires additional remediation. If you or Vince are unfamiliar with the San Francisco Bay Region Environmental <br />Screening Levels we can provide you a copy of them. <br />I hope this helps provide some direction, and if you have any questions or would like any clarifications, feel free to reach <br />out via email or give me a call. <br />Best, <br />Holly Young <br />Engineering Geologist <br />Site Cleanup Program, Federal Cleanup Unit <br />Central Valley Water Board <br />11020 Sun Center Drive, Suite 200 <br />Rancho Cordova, CA 95670 <br />Tel: 916-464-4669 <br />Email: holly.young@waterboards.ca.gov <br />2