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1 <br />Field, Cheryl [EHD] <br />From:Chao, Pinne [EHD] <br />Sent:Tuesday, April 26, 2022 4:54 PM <br />To:Field, Cheryl [EHD] <br />Subject:FW: Lab Reports 12701, 12751, and 13670 - Cogen <br /> <br /> <br />From: Cockerham, Kyle@Waterboards <Kyle.Cockerham@waterboards.ca.gov> <br />Sent: Tuesday, July 20, 2021 8:13 AM <br />To: Frier, William <Frier.William@epa.gov>; Chao, Pinne [EHD] <pchao@sjgov.org> <br />Subject: Re: Lab Reports 12701, 12751, and 13670 - Cogen <br /> <br />CAUTION: This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the <br />sender and know the content is safe. <br /> <br />Thanks Patrick. The surgery went as planned and I doing well. See you at 9:00. <br /> <br />Kyle Cockerham, PG <br />Site Cleanup Unit <br />Regional Water Quality Control Board, Central Valley Region <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, CA 95670 <br /> <br />From: Frier, William <Frier.William@epa.gov> <br />Sent: Tuesday, July 20, 2021 8:08 AM <br />To: pchao@sjgov.org <pchao@sjgov.org>; Cockerham, Kyle@Waterboards <Kyle.Cockerham@waterboards.ca.gov> <br />Subject: FW: Lab Reports 12701, 12751, and 13670 - Cogen <br /> <br />EXTERNAL: <br /> <br />Kyle and Pinne, <br /> <br />I am forwarding a conversation that I had with the toxicologist in my office (also named Patrick) to you and a chain that <br />Brian sent to me (all below). I will bring up this as a point of discussion with the RP on the call today. This thread <br />probably gives more context than you really want so I've summarized it below. <br /> <br />Long story short, the method they used previously (Method 1613) for dioxins & furans is not the method that I thought <br />it was – instead of giving the full suite of dioxins and furans it only provides information on a small subset of the highly <br />chlorinated varieties. As far as I know we do not have information on the full dioxin/furan family of chemicals. It also <br />appears that it may not be possible to get the PCB congener data from that method – I was mistaken and thought it was <br />a different method. I am unfamiliar with this method and its characteristics or limitations, so I will read up on it to make <br />sure I understand that correctly. I think that is accurate, but will let you know if I learn differently. <br /> <br />Regardless, in future analysis we should request that they use Method 1668 (rather than Method 1613), which will give <br />information on the full suite of dioxins, furans, and PCB congeners. I apologize for misunderstanding that, but the logic