Laserfiche WebLink
While reviewing the analytical report, we noticed that the samples were analyzed for TPH-D with silica gel cleanup. We <br />checked the recently submitted sampling workplan, and that method is specified for future samples as well. However, <br />we request that future samples be analyzed without silica gel cleanup. Silica gel cleanup is used to remove petroleum <br />metabolites from the sample that would otherwise be quantified as part of the total petroleum hydrocarbons. It may be <br />difficult for the Water Board to 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 6/2 2 /2 022 were analyzed with or without <br />silica gel cleanup. Would you or Scott be able to verify 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.voung@waterboards.ca.gov <br />From: Vincent Blackwood <vblackwood@apexenvirotech.com > <br />Sent: Wednesday, July 20, 2022 8:46 AM <br />To: Richard Stiffler <Richard.Stiffler@stocktonca.gov>; Young, Holly@Waterboards <Hollv.Young@Waterboards.ca.gov>; <br />Taylor, Andrew@Wildlife <Andrew.Taylor@Wildlife.ca.gov >; zzCasey Sanders <csanders@apexenvirotech.com >; Fred <br />Mitchell <Fred.Mitchell@ponder-env.com >; Alaniz, John [EHD <ialaniz1@sjgov.org>; Manzo, Elena K. [EHD <br /><emanzo@sigov.org>; Garcia-Mejia, Gabriela [EHD <ggarcia-melia@sigov.org>; Jeff Marasovich <br /><Jeff.Marasovich@stocktonca.gov>; Deedee Antypas <Deedee.Antypas@stocktonca.gov >; Scott Moss <br /><Scott.Moss@ponder-env.com >; Murphy, John@Waterboards <John.Murphv@Waterboards.ca.gov >; Tom Landwehr <br /><toml@apexenvirotech.com >; Rodriguez, Ryan@Wildlife <Ryan.Rodriguez@wildlife.ca.gov > <br />Subject: Re: Update on Remediation of Illicit Discharge - Anderson St. and 1-5 Stockton <br />EXTERNAL: <br />All, <br />Please see the attached analytical report for the sampling of the frac tanks and two soil bins. <br />Regards, <br />Vince Blackwood <br />Apex Envirotech, Inc. <br />Get Outlook for iOS <br />From: Richard Stiffler <Richard.Stiffler@stocktonca.gov> <br />Sent: Wednesday, July 20, 2022 7:45:29 AM <br />To: Young, Holly@Waterboards <Holly.Young@Waterboards.ca.gov>; Taylor, Andrew@Wildlife <br /><Andrew.Taylor@Wildlife.ca.gov>; zzCasey Sanders <csanders@apexenvirotech.com >; Fred Mitchell <br />2