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Baseline Risk Assessment for 200-BP-5 Groundwater Operable Unit
Presented to: Performance
and Risk Assessment
Community of Practice
Annual Technical Exchange
December 16, 2015
Presented by: Doug Hildebrand (DOE-RL); Donna Morgans and Alaa Aly (INTERA)
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200-BP-5 OU
• Northeastern Central
Plateau
• Remedial Investigation
Report:
– DOE/RL-2009-127; Draft A
• Under Ecology Review
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200-BP-5 Source Sites
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200-BP-5 Major Facilities
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200-BP-5 Water Discharges
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200-BP-5 Major Waste Discharges
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200-BP-5 Monitor Wells
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200-BP-5 Water Table
• Note the relatively
flat water table
covering about all
the BP-5 OU and to
the south.
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200-BP-5 Geology
• Note the small saturated thickness.
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200-BP-5 GW Contamination
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200-BP-5 OU High Concentration Area
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200-BP-5 OU – Sub Areas
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200-BP-5 OU – Evaluation of Measured Concentrations
• Simple comparison of six-year measurements (2008-2013)
to drinking water standards (DWS):– MCLs and MCLGs: Federal and State
– State of Washington Cleanup Values – MTCA Method B
– Consideration of Background Concentrations
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WMA C Contaminants (1)
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WMA C Contaminants (2)
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WMA C Contaminants (3)
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200-BP-5 OU – Risk Characterization
• Calculate Exposure Point Concentrations (EPCs):
– By area
– For selected wells
– Six-year data sets
• Toxicity Information:
– Radionuclides: EPA HEAST Tables (EPA 540-R-97-036)
– Tier 1: EPA Integrated Risk Information System (IRIS)
– Tier 2: EPA Provisional Peer-Reviewed Toxicity Values
– Tier 3: Other Toxicity Values
• Tap Water Exposure Scenario:
– EPA Regional Screening Tables
– Consistent with a Residential Exposure Scenario
– Use of GW as a tap Water Source – ingestion, inhalation, dermal
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WMA C – Sample EPC Calculations
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WMA C – Tap Water Exposure Scenario
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WMA C – Risk Characterization for Selected Wells (ELCR)
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WMA C – Risk Characterization for Selected Wells (HI)
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WMA C – Native American Exposure Scenarios
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WMA C – Risk Assessment Summary
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Conclusions
• Groundwater measurements are evaluated for each well within
the 200-BP-5 OU
– COPCs were identified for each sub area
• Risks are characterized for sub areas and selected individual
wells
• Results for WMA C show consistent conclusions for risk and
hazard drivers and identified COPCs
• Remedial Investigation results provide a basis for the
Feasibility Study
• Note: document is currently being reviewed by the Washington
State Department of Ecology. Some conclusions might change
after the comment review process.