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Event Details

General Information
Event Name: Monthly Incremental Sampling Subcommittee Virtual Training
Topic: Estimation of Soil Exposure Point Concentrations (EPCs) as 95% Upper Confidence Limits on the mean (UCL 95) at the Upper Columbia River (UCR) Site from Single Incremental Composite (IC) Samples
Hosted By: U.S. EPA, Office of Superfund Remediation and Technology Innovation
through the Technical Support Project's Engineering Forum
Event Description:

Incremental sampling is an unbiased, structured soil sampling protocol that reduces data variability and increases sample representativeness. It accomplishes this through careful up-front planning that defines what the soil samples are intended to represent, and through use of specialized sample collection and processing procedures in both the field and laboratory.

The Incremental Sampling Subcommittee was established in 2017 as a special focus workgroup within the Engineering Forum, one of the EPA Technical Support Project’s (TSP) three technical forums. The primary objectives of the Incremental Sampling Subcommittee are to: 1.) establish a national incremental sampling community of practice, 2.) develop incremental sampling expertise in every EPA Region , 3.) Educate state and federal environmental professionals, and 4.) provide information on current and new incremental sampling topics and procedures.

Presentations are specifically designed for EPA staff including RPMs, OSCs, Corrective Action Managers, Superfund and Technology Liaisons, Chemists, Biologists, Physical Scientists, and Engineers from within EPA regions, program offices, laboratory system, and headquarters personnel as well as environmental professionals from state agencies, tribes, the U.S. Army Corps of Engineers, U.S. Dept. of Energy, and other federal agencies of all experience levels. THIS TRAINING IS NOT OPEN TO ACADEMIA, CONTRACTORS, CONSULTANTS OR OTHER PRIVATE ENTITIES.

We will try to meet any special accommodations necessary for our participants as possible if given a minimum two week notice. You will be prompted to indicate if you need any special accommodations upon registering for these events.

*This training is offered free of charge to all registrants who are confirmed to attend. One CLP will be issued for each session attended when you register and log on with the registration link provided to enable your attendance to be confirmed.*

To register for more training hosted by the Engineering Forum please visit:

Additional Information:

A method was proposed for estimating exposure point concentrations (EPCs) from a single incremental composite sample (IC) when ≥3 IC samples were not available for estimating the 95% upper confidence limit on the mean (95UCL). This case study presents a statistical rationale for deriving a confidence factor (CF) to be applied to the soil concentration measured in a single IC sample and describes the approach used to derive a value for the CF that was used at the Upper Columbia River (UCR) site. The CF was based on the 95UCL/mean ratio estimated for decision units (DUs) with 3 composite samples. The 95th percentile of 95UCL/mean ratio was selected as the CF to ensure that the probability of a false negative error was ≤5% (i.e., concluding that the population mean at the DU is below a level of concern when it actually equals or exceeds the level of concern). Central to application of the CF method is the requirement to derive a robust estimate of a CF that can be applied broadly across DUs and, preferably, across contaminants. This was accomplished at the UCR site by examining estimates of the 95th percentile of the 95UCL/mean ratio derived from various groupings of DU types.

Presenter: Marc Stifelman, Human Health Risk Assessor, U.S. EPA Region 10

Registration Status: Completed
Event Begins: July 21, 2021 at 2:00 PM
Event Ends: July 21, 2021 at 3:30 PM
For questions about this event, please contact: Nate Barlet
This event will be held at: Internet Based
Live Online Class, Internet Based

A connection link for this training will be included in the automatic registration receipt emailed to you immediately after registering for this training. We recommend adding this link to your calendar as soon as you receive it, being careful to note the correct time zone for the training - Eastern in case of this training.



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