Document zQ34k7bDBJDpg5Kj562dgwGdm

CSM Update SWAC (site and 9 segment) Update Baseline Conditions Recovery Changes Since RI/FS Model Calibration Active Footprint/ RAL Remedial Technology Recontamination Potential Support Allocation Current Risk Update Institutional Controls Future Compliance Table 5. Data Use Objectives for Pre-Remedial Design Investigation Studies Portland Harbor Pre-Remedial Design Investigation Work Plan Portland, OR Proposed Scope Item Data Use Objective (DUO) # Task Purpose Pre-Design Field Investigation Studies Site-wide bathymetry survey Surface sediment sampling Fish tissue sampling Surface water sampling Sediment cores Fish acoustic tracking study Camera survey of anglers Porewater sampling footprint recovery/bkgrd recovery/bkgrd recovery/bkgrd footprint fish home range risk/IC bkgrd Technical Analyses / Reporting Evaluate current conditions Evaluate recovery changes Evaluate upstream levels Refine active footprint Evaluate fish home ranges and scale of SWAC estimate Refine human health consumption risks with current conditions footprint recovery recovery footprint fish home range recovery/risk Data Interpretation Report all X XX X X XXXX X X X X XX X X XX X X X XX X X X X XX X XX X X XX X X X X X XX XX X XXXX X X X XX X X X X X X X XX XX X X XX X X X X XX XX X XX X X XX XX XX XX Abbreviations: 1C - insitutional controls; bkgrd - background; CSM - conceptual site model; SWAC - surface weighted average concentration DRAFT Confidential - For Purposes of Settlement Negotiations Only Sierra Club v. EPA 18cv3472 NDCA Page 6 of 13 Tiers 8&9 ED 002061 00115340-00001 Table 8. Data Interpretation and Analysis Plan Portland Harbor Pre-Remedial Design Investigation Work Plan Portland, OR Data Utilization D e s c rip tio n Current Conditions and Sediment SWACs for baseline dataset Generate summary tables and maps with the new 2018 data and re-baseline the river for sediment, SMB fish tissue, and surface water for focused COCs. Generate sediment SWACs on a site-wide and segment-wide scale using Theissen Polygons for the 580-sample plan, and the statistical mean for both the unbiased 345 and 580 sample plans. Concentration Changes Over Time Provide plots(s) of the tissue data over time. Provide surface water data with simple data plots of baseline and previous applicable surface water data. Compare the new 2018 data to the 2004 dataset for sediment, tissue (2002, 2007 and 2012), and surface water media and empirically evaluate changes since the Rl: (1) The new sediment SWAC and arithmetic mean of unbiased dataset will be compared to the 2004 data at site wide and segment-wide scales to look for differences in the last 14 years. (2) Datasets will also be compared to the Downtown/Upstream Area (are the two populations different, how different, and is site recontamination expected?). (3) 87 surface sediment locations will be re-occupied from 2004, and these two populations will be compared for changes. Note: The data permits statistical comparisons at the site-wide, segment-wide, or RM-scales. Alt F Mod Active SMA Footprint (1) Confirm the active remedial footprint using new data collected during the PDI. SMA delineation activity to evaluate these data, bathymetry, and applicable historical data will be run through the ROD decision tree to support allocation. Run the new 2018 surface sediment data and bathymetry data through the ROD decision tree to refine the active remedy footprint. The 2018 core data will be combined with RI/FS subsurface coring data to update the conceptual site model understanding of subsurface contamination, collectively these data will also run through the ROD decision tree to refine the active remedy footprint and dredge volume estimate. Changes in sediment elevation will be a modifying factor for volume estimates to inform the 30% design estimates. Downtown/Upstream Baseline Report data separately to EPA by reach (Downtown / Upstream Reach). Evaluate current upriver conditions by SWAC and summary distribution statistics for other media, for future long-term comparative analysis with Site. Generate tables, maps, and summary statistics for all new 2018 data (sediment, SMB tissue, surface water, and sediment traps) as 2018 baseline conditions. These data may be compared to new site data, and qualitatively compared to older downtown/upstream data to evaluate changes and provide a first look at what may be achievable at the site for focused COCs. Background Porewater Provide porewater data to EPA, provide sufficient data to derive porewater background for metals using the passive porewater samples from the upriver reach or other appropriate background areas (see EPA March 13, 2017 framework). Fish Tracking and Camera Survey Results Provde fish tracking data to be presented as a tabular spreadsheet deliverable that includes location, tag IDs, and time stamps for each of the tagged fish. Data processing for data report limited to tabular and graphical outputs showing locations/tag IDs of fish movement (e.g. heat maps). Evaluate the fish tracking results to evaluate the home range of SMB. Maps, home range estimates, and summary tables will be generated. Note: results may inform the fish tissue sampling program and the appropriate scale for calculating baseline conditions with respect to fish. Camera data will be processed and provided with all Personal Identification Information (PII) removed. Notes: (1) Pre Design Core data collection will have limitations for characterizing final SMA footprint delineation. Accordingly, any final decision on the SMA footprint will be pending full remedial design and confirmation sampling results obtained during remedy implementation. Abbreviations: COCs - chemicals of concern; RI/FS - remedial investigation/feasibility study; RAO - remedial action objective; ROD - Record of Decision; SWAC - surface weighted average concentrations; SMB - small mouth bass DRAFT Confidential - For Purposes of Settlement Negotiations Only Sierra Club v. EPA 18cv3472 NDCA Page 13 of 13 Tiers 8&9 ED 002061 00115340-00002