ASTM D5495-94(2001)
(Practice)Standard Practice for Sampling With a Composite Liquid Waste Sampler (COLIWASA)
Standard Practice for Sampling With a Composite Liquid Waste Sampler (COLIWASA)
SCOPE
1.1 This practice describes the procedure for sampling liquids with the composite liquid waste sampler, or "COLIWASA." The COLIWASA is an appropriate device for obtaining a representative sample from stratified or unstratified liquids. Its most common use is for sampling containerized liquids, such as tanks, barrels, and drums. It may also be used for pools and other open bodies of stagnant liquid.
Note 1--A limitation of the COLIWASA is that the stopper mechanism may not allow collection of approximately the bottom inch of material, depending on construction of the stopper.
1.2 The COLIWASA should not be used to sample flowing or moving liquids.
1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
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Designation: D 5495 – 94 (Reapproved 2001)
Standard Practice for
Sampling With a Composite Liquid Waste Sampler
(COLIWASA)
This standard is issued under the fixed designation D 5495; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope other stratified liquids. The COLIWASA is used to obtain a
vertical column of liquid representing an accurate cross-section
1.1 This practice describes the procedure for sampling
of the sampled material. To obtain a representative sample of
liquids with the composite liquid waste sampler, or “COLI-
stratified liquids, the COLIWASA should be open at both ends
WASA.” The COLIWASA is an appropriate device for obtain-
so that material flows through it as it is slowly lowered to the
ing a representative sample from stratified or unstratified
desired sampling depth. The COLIWASA must not be lowered
liquids. Its most common use is for sampling containerized
with the stopper in place. Opening the stopper after the tube is
liquids, such as tanks, barrels, and drums. It may also be used
submerged will cause material to flow in from the bottom layer
for pools and other open bodies of stagnant liquid.
only, resulting in gross over-representation of that layer.
NOTE 1—A limitation of the COLIWASA is that the stopper mechanism
4.2 This practice is to be used by personnel acquiring
may not allow collection of approximately the bottom inch of material,
samples.
depending on construction of the stopper.
4.3 This practice should be used in conjunction with Guide
1.2 The COLIWASA should not be used to sample flowing
D 4687 which covers sampling plans, safety, QA, preservation,
or moving liquids.
decontamination, labeling and chain-ofcustody procedures;
1.3 This standard does not purport to address all of the
Practice D 5088 which covers decontamination of field equip-
safety problems, if any, associated with its use. It is the
ment used at waste sites; and Practice E 5283 which covers
responsibility of the user of this standard to establish appro-
project specifications and practices for environmental field
priate safety and health practices and determine the applica-
operations.
bility of regulatory limitations prior to use.
5. Sampling Equipment
2. Referenced Documents
5.1 COLIWASAs are available commercially with different
2.1 ASTM Standards:
types of stoppers and locking mechanisms, but they all operate
D 4687 Guide for General Planning of Waste Sampling
using the same principle. They can also be constructed from
D 5088 Practice for Decontamination of Field Equipment
materials such as polyvinylchloride (PVC), glass, metal, or
Used at Nonradioactive Waste Sites
polytetrafluoroethylene (PTFE). A traditional model of the
4 ,5
D 5283 Practice for Generation of Environmental Data
COLIWASA is shown in Fig. 1 [de Vera et al.] ; however, the
Related to Waste Management Activities: Quality Assur-
design can be modified or adapted, or both, to meet the needs
ance and Quality Control Planning and Implementation
of the sampler. COLIWASAs must be selected that are con-
structed of materials compatible with the waste being sampled
3. Summary of Practice
and with the analyses or tests to be performed. Due to the
3.1 A clean device is slowly lowered into the liquid to be
unknown nature of most containerized liquid wastes, COLI-
sampled. After it has filled, the bottom of the sampling tube is
WASAs made of glass or polytetrafluoroethylene are best for
closed and the device is retrieved. The contents are subse-
general use.
quently discharged into a sa
...
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