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Additionally, we were able to confirm that the tanks were installed in 1996, which is after leaded <br /> gasoline was banned. We did not observe any staining, odor, or signs of impact during our <br /> investigation, and the PID data supports this. We can certainly include these findings in our <br /> completion report. <br /> Based on this information, we suggest analyzing for total lead first. If the data indicates that further <br /> testing for organic lead or speciation is needed (for example exceeding commercial screening level), <br /> then we can proceed with that as well. I would be glad to discuss this further with you if needed. <br /> Thank you, <br /> E0 Scott Johns,PE,QSD <br /> Associate <br /> —aped Exceffence 925-570-5855 <br /> From: Patti Sandrock<pail.sandrocl@torrentlaboratory.com> <br /> Sent:Thursday,October 9,2025 2:57 PM <br /> To:Scott Johns<sjohns@engeo.com> <br /> Cc:Torrent Laboratory, Inc. (:)M@torrentlaboratory.com)<qM@torrentlaboratory.com> <br /> Subject: UST Sampling <br /> Security WARNING:This is an <br /> external email.Do not click links or <br /> open attachments unless you Hi Scott, <br /> recognize the sender and know the <br /> content is safe. Yes, Total Lead analysis by either ICP or ICP-MS captures all of the <br /> environmentally available lead present in the sample when the sample is <br /> processed by 3050B acid digestion for soils or 3010A for waters. The digestion completely dissolves <br /> the samples and the lead present is broken down in its elemental form. For silicate bound structures <br /> an additional digestion procedure is necessary for total digestion (method 3052) but, unless <br /> crystalline silicate bound, not for Lead. The only consistent occurrence of this in the U.S.A. <br /> appears to be in Missouri so, unless you have other reasons to believe the lead may be in this <br /> crystalline structure, EPA 3050B digestion with 6010 or 6020 analysis is sufficient. <br /> Organic Lead is a form of speciation used for particular sites where the Lead is significantly high. I <br /> would do as you suggest- analyze for total lead and, based on that concentration, run organic lead <br /> only if there appears to be a necessity for speciation. <br /> Thanks, <br /> Patti <br /> I, <br /> Torrent Patti L Sandrock QA Officer <br /> LABORATORY, INC . <br /> 0: (408) 263-5258 ext: 208 1 M: (408) 931-1392 <br /> K�; 483 Sinclair Frontage Rd. Milpitas, CA 95035 <br />