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Co-Located Chemical Sampling Planned Sampling Approach

Co-Located Chemical Sampling Planned Sampling Approach. Laura Rainey Department of Toxic Substances Control October 12, 2010. Goals for Co-located Chemical Sampling Effort.

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Co-Located Chemical Sampling Planned Sampling Approach

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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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