Laserfiche WebLink
From:John Lane <br />To:Nathan Gustus; Luke Castle <br />Subject:RE: Riverbank WWTP Soil Sampling <br />Date:Monday, October 7, 2024 4:33:11 PM <br />Attachments:image001.png <br />image002.png <br />image003.png <br />image004.png <br />image005.png <br />FR 20241007 Summary Report.pdf <br />CAUTION: This is an external email. DO NOT click links or open attachments unless you recognize the sender and <br />know the content is safe. <br />Hi Nate, <br />Attached is the Characterization Report for the Riverbank Dump Site/WWTP. <br />Metals were within background concentrations. <br />Low level TPH concentrations in borings generally within the footprint of the former dump site, but a <br />relatively low levels that are not a health concern. <br />No PCBs except for one detection in one boring at low concentration. <br />Only one sample contained PAHs (the easternmost boring, DP-1), but at concentrations below DTSC <br />screening levels for commercial/industrial settings. <br />Same as above for SVOCs. <br />The additional sample at DP-15-10 for dioxins (due to burned debris) did contain dioxins. The toxic <br />equivalence (TEQ of 28.6 pg/g) was below the DTSC industrial screening level of 220 pg/g but above <br />the “outdoor worker” screening level of 22 pg/g recommended by DTSC (HHRA Note 2, April 2017) <br />so appropriate PPE should be employed if construction occurs in that area. <br />No asbestos in the one sample analyzed. <br />Based on observations of debris in the borings, the former dump limits may be a bit wider than what <br />is depicted in your workplan, perhaps defined by concrete debris observed in borings DP-8 on the <br />east end and DP-22 on the west end. <br />Let me know if you have any questions with the attached report or if you spot any necessary edits. <br />Thank you, <br />John Lane, PG <br />Condor EarthOffice: 209-938-1061 <br />Mobile: 209-743-7443 <br />jlane@condorearth.com <br />From: John Lane <br />Sent: Monday, September 30, 2024 11:42 AM