Laserfiche WebLink
3 <br />From: Wilson, Patrick <Wilson.Patrick@epa.gov> <br />Sent: Monday, July 19, 2021 4:04 PM <br />To: Frier, William <Frier.William@epa.gov> <br />Subject: RE: Lab Reports 12701, 12751, and 13670 - Cogen <br /> <br />Good Afternoon, <br /> <br />Hope you’re well. <br /> <br />I’ve attached a table with US EPA’s analytical methods for PCBs. The method in question would be EPA method <br />1668. This is the analytical method used for Semi-Volatile Organic Compounds (SVOCs) at low limits of detection. PCBs, <br />dioxin & furans are all members of this family of compounds (SVOCs) & this method is frequently used to compare <br />contamination levels with RSLs (ppt range). <br /> <br />Our assumption here is that the RP used method 1668 to quantify the concentration of dioxins & furans in contaminated <br />media. If so, that method detects & quantifies all SVOCs within the scope of the method. Many RPs may attempt to <br />reduce costs by asking the lab to report a limited number of select constituents – but the analytical method is suitable & <br />used to quantify the entire spectrum of SVOCs at low limits of detection. <br /> <br />This is not an unusual approach or request & our DOD sites make use of this same strategy to reduce costs when media <br />is contaminated with these type of constituents (rather than a separate analysis to quantify PCBs as aroclor fractions <br />only). <br /> <br />The table below was copied from the DTSC Human Health & Ecological Risk Office (HERO) (their toxicologists) memo <br />regarding PCBs. <br /> <br />If you’d like additional support on your call – simply let me know & I can try to participate? <br /> <br />Take good care….. <br /> <br />~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <br /> Patrick Wilson, Ph.D., M.P.H. |Senior Regional Toxicologist | <br />415.972.3354 | wilson.patrick@epa.gov <br />US EPA Region IX | 75 Hawthorne St., San Francisco, CA 94105-3901 <br />http://www.epa.gov/region9/ <br />~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />Table 4.1 Common <br />Laboratory Methods <br />for PCB Analysis <br />Analysis <br />Method Estimated Cost Typical Reporting <br />Limit <br /> <br />Aroclors EPA 8082 <br />(GC-ECD*) <br />Low <br />($50-150/sample) <br />~ 33 μg/kg (solid) <br />~ 1 μg/L (aqueous) <br />Homologs EPA 680/8270 Medium ~ 1 μg/kg (solid)