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

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Presentation transcript:

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

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).

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

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

Sampling Intervals  Placeholder for 5B chart

Table of Analytes-- Primary Analyses (anticipated to be performed on all collected soil samples): AnalysisEPA Method (unless otherwise listed) Volatile Organic Compounds8260B Metals6010/6020B Mercury7471A Chromium VI7196A or 7199 Semivolatile Organic Compounds8270C Polycyclic Aromatic Hydrocarbons8270 SIM Perchlorate314.0 Polychlorinated Biphenyls8082 Fluoride300.0/9056A Dioxin/Furans1613B Total Petroleum Hydrocarbons (gas/oil/diesel)8015B Percent Moisture160.3

Table of Analytes-- Secondary Analyses (performed on selected soil samples): AnalysisEPA Method (unless otherwise listed) 1,4-Dioxane8260B SIM Formaldehyde8315A Hydrazine8315A n-Nitrosodimethylamine1625C Energetics8330A Cyanide9012B pH9045C Alcohols8015B Terphenyls8015B Glycols8015B Methyl Mercury1630 Organic TinNOAA Status and Trends Asbestos600/R-93/116 Pesticides8081A Herbicides8151

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

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