1. Overview of Co-located Soil Chemical Sampling Approach Stephie Jennings, DOE October 12, 2010

2. Agreement in Principle • Agreement in Principle states: • “Where EPA is already taking samples for radiologic contaminants as part of its Area IV and Northern Buffer Zone survey work, DTSC will arrange for analysis of split samples (paid for by DOE)”

3. Objectives of Chemical Co-located Sampling • To provide an even greater level of knowledge about chemical contamination in Area IV and the NBZ • To take advantage of EPA’s efforts for soil collection in terms of timing • To begin to determine if chemical and radionuclide soilcontamination are co-located or are they separate problems?

4. Why? • Due to volume needed for sampling the decision was made to co-locate samples instead of splits • Entire effort is prescriptive • EPA makes location decisions • DTSC approves sampling plan and approach • Answers questions about co-location of radionuclide and chemical contamination • Uses DOE’s existing contract with CDM to quickly be in the field with EPA

5. Proposed Process • DTSC • Approves Sampling and Analysis Plan • Provides approval to proceed • EPA • Identifies soilsample locations with public • Collects soilsample for chemical analysis • Gives sample to CDM • DOE/CDM • Accepts soilsample from EPA • Procures laboratories for soil samplechemical analysis in collaboration with DTSC and with input from key stakeholders