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Co-Located Chemical Sampling: Enhancing Cleanup Decisions

Learn about the planned sampling approach in chemical sampling efforts co-located with radionuclide data, aimed at identifying key contaminants for effective cleanup decisions. Understand the key differences and goals behind this collaborative effort. The Department of Toxic Substances Control provides insights from October 12, 2010, outlining the importance of this sampling strategy.

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Co-Located Chemical Sampling: Enhancing Cleanup Decisions

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  1. Co-Located Chemical Sampling Planned Sampling Approach Laura Rainey Department of Toxic Substances Control October 12, 2010

  2. Goals for Co-located Chemical Sampling Effort • Opportunity to obtain additional chemical data (co-located with radionuclide data) to assist in identifying key chemical contaminants that may drive cleanup decisions. • Takes advantage of all the additional information that EPA has obtained to target sampling (EPA Historical Site Assessments, Gamma Scanning Data, Geo-physical logging, former worker interviews, aerial photography analysis).

  3. Key Differences • The Agreement in Principle envisions “split” sampling • Decision made to co-locate chemical sampling due to chemical sampling needs: • Amount of soil volume needed due to differences in radionuclide and chemical analytical method needs • Chemical sample interval based on RFI/RI approach and utilizes field screening and visual observations

  4. Key Differences: Rad vs. Chemical Sampling • Amount of soil volume needed • Volume required dependent on EPA chemical analytical method requirements • Sample collection and handling • Homogenization over depth interval (rad) vs. discrete sampling (chemical) • Chemical analyses utilize EPA analytical methods • Chemical sample depth interval • Selection based on RFI/RI approach • Discrete depths selected based on site features (including excavations/fill areas), screening and visual field observations

  5. Sampling Intervals • Placeholder for 5B chart

  6. Table of Analytes--Primary Analyses (anticipated to be performed on all collected soil samples):

  7. Table of Analytes--Secondary Analyses (performed on selected soil samples):

  8. DTSC Oversight • DTSC will: • Periodically observe sampling in field to ensure procedures are being followed • Participate in quality audits of the laboratories • Obtain quality control split samples to be sent to DTSC laboratory

  9. Conclusions • Chemical co-located sampling will be a significant input to DTSC for purposes of determining the nature and extent of residual chemical contamination in Area IV and the Northern Undeveloped Land

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