Section 21-1999. DEFINITIONS

 

1999.1When used in this chapter, the following words and phrases shall have the meanings ascribed:

 

Accuracy - the measure of bias or consistent departure from the known true value and is determined by using standards and duplicates.

 

Act - the District of Columbia Water Pollution Control Act of 1984.

 

Ambient - those conditions which would be normally expected to prevail in the waters of the District, including any legally permitted point and nonpoint source discharges of pollutants; or, in reference to a particular source of pollution, means those conditions which would be expected to prevail without the source of pollution such as in a free flowing, nontidal stream those conditions upstream of the particular source of pollution.

 

Director - the Director of the Department of Consumer and Regulatory Affairs or his or her representative.

 

Duplicate - the repeated analysis of split portions of the same sample.

 

Field measurement - those physical, chemical, radiological and biological properties of samples which are measured in the field at the site of sample collection.

 

Laboratory measurement - those physical, chemical, radiological and biological properties of a sample which are determined in a laboratory.

 

Monitoring - the preparation of equipment, the collection of samples, the field and laboratory measurements, the preservation and preparation of the sample and the reporting and storage of the data collected.

 

Precision - the measurement of closeness with which repeated analysis of a parameter agree and is determined from duplicate samples.

 

Replicate - those determinations on samples from the same source environment.

 

Sample - a discrete quantity of water, sediment, biota or other matter which is representative of the source or place from which it was taken.

 

Spike - the addition of a known amount of a substance to sample matrix containing a measured background concentration of the substance and is useful for determining precision and accuracy.

 

Standard - a prepared sample matrix containing a known amount of a substance and is useful for calibration and accuracy determinations.

 

source

Final Rulemaking published at 42 DCR 654, 657 (February 3, 1995).