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Significance and Use
5.1 This practice is applicable to sampling liquid wastes and other stratified liquids. The COLIWASA is used to obtain a vertical column of liquid representing an accurate cross section of the sampled material. To obtain a representative sample of stratified liquids, the COLIWASA should be open at both ends so that material flows through it as it is slowly lowered to the desired sampling depth. The COLIWASA must not be lowered with the stopper in place. Opening the stopper after the tube is submerged will cause material to flow in from the bottom layer only, resulting in gross over-representation of that layer.
5.2 This practice is to be used by personnel acquiring samples.
5.3 This practice should be used in conjunction with Guide which covers sampling plans, safety, QA, preservation, decontamination, labeling, and chain-of-custody procedures; Practice which covers decontamination of field equipment used at waste sites; Practice which covers project specifications and practices for environmental field operations; and Practice which covers drum sampling.
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 2.54 cm (1 in.) of material, depending on construction of the stopper.
1.2 The COLIWASA should not be used to sample flowing or moving liquids.
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice . Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D4687 Guide for General Planning of Waste Sampling
D5088 Practice for Decontamination of Field Equipment Used at Waste Sites
D5283 Practice for Generation of Environmental Data Related to Waste Management Activities: Quality Assurance and Quality Control Planning and Implementation
D5681 Terminology for Waste and Waste Management
D5743 Practice for Sampling Single or Multilayered Liquids, With or Without Solids, in Drums or Similar Containers
D6026 Practice for Using Significant Digits in Geotechnical Data
D6232 Guide for Selection of Sampling Equipment for Waste and Contaminated Media Data Collection Activities
ICS Number Code 13.030.20 (Liquid wastes. Sludge)
UNSPSC Code 76121502(Liquid waste collection or processing or disposal)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D5495-21, Standard Practice for Sampling with a Composite Liquid Waste Sampler (COLIWASA), ASTM International, West Conshohocken, PA, 2021, www.astm.orgBack to Top