1. River Corridor Closure Project Safety People Results U.S. Department of Energy Richland Operations Office 100 Area and 300 Area Component of RCBRA Steve Weiss June 1 and 2, 2006

2. River Corridor Closure Project Safety People Results 2 Document Status Sampling and Analysis Plan (SAP) on web* - to be delivered soon) Significant changes based on Trustee Input, August 2005 SAP workshop Fall Data Summary Report (mailed May 30) Sampling and Analysis Instructions (SAI) (details on sampling procedures) to follow *http://www.washingtonclosure.com/projects/endstate/docs/RL2005-42_Rev_0.pdf

3. River Corridor Closure Project Safety People Results 3 Most Significant SAP Changes Changes based on August 2005 workshop Additional reference sites selected based on input from U.S. Fish and Wildlife Service and Ecology 24 near-shore investigation areas added Inclusion of amphibian tissue collection (up to 10 samples)

4. River Corridor Closure Project Safety People Results 4 Most Significant SAP Changes (continued) Increased upland samples: –Multi-increment soil samples from 30 to 150 –Plant samples from 45 to 60 (Table 3-5) –Invertebrate samples from 15 to 30 (Table 3-5) Increased upland toxicity tests from 15 to 30 (Table 3-6)

5. River Corridor Closure Project Safety People Results 5 Most Significant SAP Changes (continued) Increased riparian samples: –Multi-increment soil samples from 15 to 75 Plant samples reduced from 45 to 30 (Table 3-8)

6. River Corridor Closure Project Safety People Results 6 Most Significant SAP Changes (continued) Increased near-shore biota samples (Tables 3-11, 3-12) –Aquatic macroinvertebrate samples from 15 to 27 –Clam samples from 15 to 54 Fish to include full suite contaminant analysis, –liver for isotopic uranium, –kidney for chromium (metals), and –organ histopathology on 135 individual fish (Table 3-12) Total near-shore aquatic toxicity tests increased from 45 to 148 (Table 3-13) (Bok choy used in place of yellow nutsedge per Section 2.2.6.3 of SAP)

7. River Corridor Closure Project Safety People Results 7 Fall Data Summary Report Recently delivered Describes Fall 05 sampling (October 05 to December 05) Includes only raw results –Except for MIS Performance Assessment Contains some bioassay results Data Report for ‘spring’ provided in fall 2006

8. River Corridor Closure Project Safety People Results 8 Reference Locations Draft summary of selection rationale distributed 10 upland, 5 riparian, and 7 aquatic sites selected for reference areas based on locations, habitat types, and input Basis for selection per EPA guidance (e.g., EPA Update: Selecting and Using Reference Information in Superfund Ecological Risk Assessments)

9. River Corridor Closure Project Safety People Results 9 Reference Locations (continued) EPA Guidance (Reference samples) collected from the least impacted (or unimpacted) area of the Superfund site, or from a nearby site that is ecological similar to the Superfund site and is not affected by the Superfund site contaminants.” ‘…should be as similar as possible to those believed to have existed at the Superfund site before contamination occurred.’ “…should be higher in the drainage system but otherwise located as close as possible to the (Superfund site). A general guideline is to select reference locations that reflect the overall environmental conditions that can reasonably be expected in the site area given current uses other than those associated with the contamination under investigation. (EPA Guidance)”

10. River Corridor Closure Project Safety People Results 10 Reference Locations (continued) Upland reference locations selected to capture range of ecological conditions, from pristine to recovering native habitat. Seven near-shore, five riparian reference areas chosen. “Vernita Bridge” area actually covers several miles of both sides of river

11. River Corridor Closure Project Safety People Results 11 Reference Locations (continued) Trustee Guidance Adds (paraphrased): ‘Undisturbed or minimally disturbed’ (multiple locations, cf EPA Guidance) ‘Lies at a great enough distance from the Superfund site to be outside its sphere of influence (such as air emissions)’ (see DOE/RL-2005-49)

12. River Corridor Closure Project Safety People Results 12 Reference Locations (continued) One media (riparian soil) near Vernita Bridge (reference location #13) with anomalous metals results –Cr-VI undetected in pore water or sediment –Large quantities of organic material at site –Re-run of one sample showed Cr-VI undetected (past holding time) –Total Cr range 15.8 to 18.4 ppm; Cr-VI range 2.07 (U) to 10.4 ppm –Suggest additional samples (Cr-VI and metals) with splits to Ecology

13. River Corridor Closure Project Safety People Results 13 Multi-Increment Sampling Performance Assessment evaluated MIS variance within sites –5 MIS for each site Former (remediated) debris sites showed highest variance for COCs Continued taking 5 MIS samples at each site (sampling just completed) Evaluation will continue

14. River Corridor Closure Project Safety People Results 14 “Spring” Sampling Status Completed fish sampling –Sculpin are resident & have small home range –Analyze whole body for full suite –Kidneys for metals –Livers for uranium Low fish numbers (poor habitat) in two locations –part of 300 Area –part of 100-K downstream Histopathology on multiple organs in 115 different sculpin (insufficient fish to get 135)

15. River Corridor Closure Project Safety People Results 15 “Spring” Sampling Status (continued) Pore water, river water, and sediment collected at 37 locations. –Insufficient sediment at two locations at 100-N. Adjacent deeper vertical-tube pore water samples collected at 2 of 3 locations Clam tubes (162) and macro- invertebrate baskets (162) placed in December; estimated July retrieval

16. River Corridor Closure Project Safety People Results 16 “Spring” Sampling Status (continued) Dosimeters all collected after 6 months Groundwater sampling (unfiltered water) continuing; 13 wells left Amphibian and bird surveys begun in mid-May; no samples yet

17. River Corridor Closure Project Safety People Results 17 “Spring” Sampling Status (continued) Plant samples completed Small mammals & invertebrates completed (second set at one site started in late May) Additional invertebrates may be collected at selected sites (based on MIS results) for selected SVOCs (not part of SAP)