Lead Dust Sampling Technician March 2009 4-1 Chapter 4 Selecting a Laboratory and Interpreting Results.

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Presentation transcript:

Lead Dust Sampling Technician March Chapter 4 Selecting a Laboratory and Interpreting Results

Lead Dust Sampling Technician March Objectives Select an EPA-recognized lab Maintain a chain of custody Review and interpret lab results

Lead Dust Sampling Technician March Selecting a Laboratory Submit samples to a lab recognized by EPA’s National Lead Laboratory Accreditation Program (NLLAP) To locate a lab –Call the National Lead Information Center (NLIC) at LEAD –Visit the EPA Web site at See the fact sheet “Selecting a Lead Laboratory” at the end of this chapter.

Lead Dust Sampling Technician March Questions To Ask Laboratories Tell the lab you will be collecting dust wipe samples for lead. Ask: –Is the laboratory recognized to analyze for lead in dust by NLLAP? –Will sampling materials be provided? –What is the turnaround time for analysis? –Can the laboratory analyze composite samples? (If the client wants composite samples) –What is the cost per sample?

Lead Dust Sampling Technician March Quality Control in the Field Submit blank wipe samples. Duplicate, or side by side sampling can be used to check lab consistency. Review all of your sample collection and chain-of-custody forms. Carefully review all lab results.

Lead Dust Sampling Technician March Review Your Sample Collection Form Confirm all information is recorded clearly and correctly. –Sample numbers –Sample locations –Sample dimensions Keep a copy for your records and note blanks.

Lead Dust Sampling Technician March Chain of Custody A record of each person who handles the sample from the time it is collected until it is sent to the lab. The lead dust sampling technician is responsible for maintaining chain of custody until he or she transfers custody of the samples. Include information on sampling form A sample Chain of Custody form is shown on the next page, and as an attachment to this chapter.

Lead Dust Sampling Technician March

Lead Dust Sampling Technician March Evaluating Laboratory Results for Single Samples Check for appropriate units (  g/ft 2 ) Compare results to the EPA/HUD clearance standards for lead dust: –Floors < 40 µg/ft 2 passes –Sills < 250 µg/ft 2 passes –Troughs < 400 µg/ft 2 passes

Lead Dust Sampling Technician March Activity: Interpreting Laboratory Results Turn to Attachment 4-D Answer the questions. Be prepared to explain your answers.

Lead Dust Sampling Technician March Evaluating Laboratory Results for Composite Samples Location2 Subsamples3 Subsamples4 Subsamples Floors40 µg/ft 2 27 µg/ft 2 20 µg/ft 2 Sills250 µg/ft µg/ft µg/ft 2 Troughs400 µg/ft µg/ft µg/ft 2

Lead Dust Sampling Technician March Avoiding Common Mistakes Mistaking weight (mass) for surface loading by using incorrect units (  g for  g/ft 2 ) Not submitting blank samples –Labeling or recording in the sample log blank samples as blanks Not maintaining a chain of custody

Lead Dust Sampling Technician March Summary Select an EPA-recognized lab. –Call LEAD –Visit –Ensure that the lab is EPA-recognized for the analysis of lead in dust. Maintain a chain of custody. Interpret lab results.