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APEX <br />ENVIROTECH.INC. <br />From: Young, Holly@Waterboards <Holly.Young@Waterboards.ca.gov> <br />Sent: Wednesday, July 20, 2022 2:57 PM <br />To: Vincent Blackwood <vblackwood@apexenvirotech.com >; Richard Stiffler <br /><Richard.Stiffler@stocktonca.gov>; Taylor, Andrew@Wildlife <br /><Andrew.Taylor@Wildlife.ca.gov>; zzCasey Sanders <csanders@apexenvirotech.conn>; <br />Fred Mitchell <Fred.Mitchell@ponder-env.com >; Alaniz, John [EHD <br /><ialaniz1@sigov.org>; Manzo, Elena K. [EHD <emanzo@sigov.org>; Garcia-Mejia, <br />Gabriela [EHD <ggarcia-nnelia@sigov.org>; Jeff Marasovich <br /><Jeff.Marasovich@stocktonca.gov>; Deedee Antypas <br /><Deedee.Antypas@stocktonca.gov>; Scott Moss <Scott.Moss@ponder-env.com >; <br />Murphy, John@Waterboards <John.Murphy@Waterboards.ca.gov>; Tom Landwehr <br /><toml@apexenvirotech.com >; Rodriguez, Ryan@Wildlife <br /><Ryan.Rodriguez@wildlife.ca.gov> <br />Subject: RE: Update on Remediation of Illicit Discharge - Anderson St. and 1-5 Stockton <br />Hi Vince, <br />Thank you for the sample results. <br />While reviewing the analytical report, we noticed that the samples were analyzed for <br />TPH-D with silica gel cleanup. We checked the recently submitted sampling workplan, <br />and that method is specified for future samples as well. However, we request that <br />future samples be analyzed without silica gel cleanup. Silica gel cleanup is used to <br />remove petroleum metabolites from the sample that would otherwise be quantified as <br />part of the total petroleum hydrocarbons. It may be difficult for the Water Board to <br />approve closure of a site that used silica gel cleanup for petroleum samples. <br />Looking at past lab reports, it is unclear if the samples collected by Ponder on 6/22/2022 <br />were analyzed with or without silica gel cleanup. Would you or Scott be able to verify <br />which method was used? <br />Thank you, and apologies for missing this earlier! <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 />3