1. Preliminary Results from Surface Water Monitoring with C.L.A.M. at the Spokane Tribal Boundary in May and September of 2015 Brandee Era-Miller Washington State Department of Ecology Environmental Assessment Program Toxics Studies Unit Presentation to SRRTTF TWG 1-6-16

3. May 2015 September 2015 Results for total PCB congeners: Results are within the noise of the C.L.A.M. sampling system (SPE disk housing contamination) Concentrations represent totals from Lab (need to blank correct per project objectives) Blanks shown are either Trip or Transfer (most comparable to samples)

4. PCB Homologue Example: Mono and Di (lightest) and Nona and Deca (Heaviest) – no environmental signal Tri through Octa appear to have potential environmental signal above the noise Still need to look at this for all samples 20 liter C.L.A.M. from May 2015

5. Results for PBDEs: Blanks shown are either Trip or Transfer (most comparable to samples) PBDE 47 appears to have strongest environmental signal above sampling system noise PBDE 99 and 209 are in the sampling system noise for half of the samples Still need to look at other PBDE congeners (40+) May 2015 September 2015

6. What Next? Use XAD-2 instead of C.L.A.M. for upcoming January sampling: o See if results can get above the noise o Upcoming Ecology study using XAD-2 at same location (Will Hobbs) Apply blank correction per project objectives and TWG input Look for patterns and information in homologues & congeners Summarize study information on C.L.A.M. QA/QC: o Breakthrough SPE disk analysis o Characterization of PCB contamination from disk housing EAP still evaluating appropriate use of C.L.A.M. o May not be best tool for low-level PCBs o Stainless steel SPE disk housing o Waiting on results of AXYS blank study

7. How to Blank Correct? Report NJs per SRRTTF/LimnoTech QAPP, but do NJs get included in totals? If using NJs, then should we include NJ data in blank correction? Seems like a good idea. 3x blank rule used in SRRTTF/LimnoTech QAPP, but 3x rule is typically not used by labs. 5x and 10x are more typical. Examples below are from Spokane Tribal Boundary Monitoring Study.