Paint Waste Sampling Procedures
In order to insure accurate results form the TCLP test,
correct sample procedures must be followed.
1. Segregation of Waste streams:
To insure the proper samples are taken from a given waste
stream, it is important that the waste stream remains separated from any other material.
2. Sampling Procedure:
Samples must be taken at random and be representative of
the entire waste stream. Small samples should be taken from various locations in the waste
pile. Never pull sample from top of pile, as this will not provide an accurate sample.
Entire sample pulled from pile should weigh about 4 pounds. Then thoroughly mix entire
sample together and split into four with a shovel or mechanical splitter. Minimum
samples collected is four, but may require more with a larger job. Please check with your
lab for proper amount of sample needed.
3. Before placing sample into containers, split each of the
four samples in half. Send one half of each sample to the lab and retain the rest (4 to
lab and 4 retained by contractor), in the event further testing is required.
4. Each sample must be properly labeled and appropriate
chain of custody forms filled out. Secure the sample with tape over top and down sides.The
label must be placed over the tape. This is important to insure the sample is not
contaminated between site and laboratory. Please be sure the label contains company name,
location, date and under what condition the sample was taken.
5. A field book should be kept with each sample number,
including location maps, waste stream characteristics, and any other pertinent information
about the sample and project to insure compliance.
The above procedures are presented as
guidelines for the obtaining of waste samples, Other methods that insure a uniform sample
is taken, can be used at the discretion of the the contractor for testing. The EPA
requires well documented techniques for waste sampling and collection. Additional
information can be obtained through the EPA manual SW-846 or ASTM standard D75. For
further assistance, please call a NexTec, Inc. representative 1-800-338-8296.
Application Optimization Testing
By obtaining a control sample and testing PreTox
application rates prior to starting a project, the application of PreTox can be optimized.
The following represents an example of the optimization procedure:
1. Locate four areas that can be segregated from each other
so that independent samples can be collected. Area should be large enough to generate
enough waste for a TCLP test, typically 300 grams. For abrasive blasting, 4 square feet is
usually adequate.
2. Cover each
succeeding area with 10, 20, and 30 wet mils, respectively. In some special cases, a
different range of mil thickness may be appropriate when recommended by NexTex, Inc.
technical services.
3. Allow to dry thoroughly.
4. Remove coating from each test area with chosen method
i.e.: abrasive blasting, needle gun, etc. Collect each independent sample following EPA or
ASTM sampling protocol and send to an accredited lab for TCLP testing.
5. When test results are received, choose the application
rate that achieved a BDL (below detectable limits) result or rate that was closest to BDL
and add 5 wet mils. This will be the recommended, optimum application rate.
First Day Blasting Testing:
Three identical samples are needed, two to send to the lab
and the other for you to retain. Sample bottle must be full. Please fill out the label for
each bottle and the chain of custody form completely.
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4050 Westmark Drive. Dubuque, Iowa 52002 www.pretox.com
1-800-338-8296