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From: Rivera,Stacy[EHD]<srivera sjgov_org> Sent:Thursday,October 16, 2025 1:28 PM To: Patti Sandrock<path.sandrock@torrentlaboratory.com> Cc:Scott Johns<sighns@engeo.com>; Manzo, Elena K. [EHD] <emanzo@sjgov.org>; Brett Baatrup<bbaatrup@icsinc.ty>; Robert Peck<rpeck engeo.com> Subject: RE: UST Sampling-Stockton You don't often get email from srivera@sjgov.org.Learn why this is important Security WARNING:This is an external email.Do not click links or open attachments unless you Hi Patti, recognize the sender and know the content is Safe. Thank you for the detailed response. We appreciate you taking the time to address our concerns. Best regards, Stacy Rivera Lead Sr.Registered Environmental Health Specialist San Joaquin County Environmental Health Department 1868 E.Hazelton Ave.,Stockton,CA 95205 phone(2o9)616-3043 fax(209)468-3433 *Test notifications and test results should be sent to the general UST email:ust s v.org* *NOTE* I will be out of office every other Friday.If you are unable to reach me on those days and need to speak to someone immediately,please call(209)468-3420 or email our UST email address. June 6, 20 1 July 18 1 August 1, 15, 29 1 September 12,26 EHD will be closed for the holidays on: July 4 1 September 1 i November 11, 27, 28 i December 25 From: Patti Sandrock<patti.sandrock@torrentlaboratory.com> Sent:Wednesday,October 15, 2025 3:43 PM To: Manzo, Elena K. [EHD]<emanzo@sjgov_org> Cc:Scott Johns<sighns@engeo.com>; Brett Baatrup<bbaatrup@icsinc.ty>; Robert Peck<rpeck engeo.com>; Rivera, Stacy[EHD]<srivera sjgov.org> Subject: Re: UST Sampling-Stockton Hi Elena and Stacy, I have just spoken with Scott Johns at Engeo and he requested that I respond, as the laboratory representative, directly to you regarding lead preparation and analysis. Total Lead analysis by either ICP or ICP-MS captures all of the environmentally available lead present in the sample when the sample is processed by 3050B acid digestion for soils or 3010A for waters. The digestion completely dissolves the samples and the lead present is broken down in its elemental form. For silicate bound structures an additional digestion procedure is necessary for total digestion (method 3052) but, unless crystalline silicate bound, not for Lead. Based on the lead data provided and Scott's clarification that crystalline silicate-bound structures, such as those found in quartz and granite, were not present in the site soil, additional analysis for the organic form of Lead would not be necessary.