Groundwater Retrieval Network (GRN)
Glossary of terms and definitions
Groundwater Retrieval Network Glossary of terms and definitions
The following are terms used in the Groundwater Retrieval Network (GRN).
- C.A.S.#: A unique number assigned by the Chemical Abstracts Service to every uniquely identifiable substance.
- Enforcement Standard (ES): The standard for the concentration of a substance in groundwater as listed in ch. NR 140, Wisconsin Administrative Code. The enforcement standard serves as both a minimum cleanup standard and a maximum concentration allowed in groundwater before action must be taken.
- FID: Facility identification number; the number of the facility or water system for the well.
- Groundwater Extraction Well: A well installed for the purpose of pumping contaminated groundwater out of the ground or for pumping groundwater to lower the water table (also known as de-watering) to install a pipeline in a trench.
- Limit of Detection: The lowest concentration of a substance that can be determined to be significantly different from zero.
- Limit of Quantitation: The level above which a quantifiable concentration can be measured in a sample with a specific degree of confidence.
- Monitoring Well: A well or drill hole constructed for the purpose of obtaining information on the physical, chemical, radiological or biological characteristics of the groundwater.
- Municipal Community (MC): A public system that serves at least 15 service connections used by year-round residents or regularly serves at least 25 year-round residents. These systems include cities, villages and sanitary districts.
- Non-potable Private: A private water system supplying water for purposes other than human consumption, sanitary use or for the preparation of food or pharmaceutical products.
- Non-transient Non-community (NN): A NN public water system is not a community water system and regularly serves at least 25 of the same people over six months per year. These include schools, daycare centers and factories.
- Other-Than-Municipal Community (OC): An OC public water system serves at least 15 service connections used by year-round residents or regularly serves at least 25 year-round residents but is not a municipal system. These include mobile home parks, apartment buildings and condominium complexes.
- Piezometer: A groundwater monitoring well sealed below the water table installed for the specific purpose of determining either the elevation of the potentiometric surface or the physical, chemical, biological or radiological properties of groundwater at some point within the saturated zone, or both.
- Preventive Action Limit (PAL): The limit for the concentration of a substance in groundwater as listed in ch. NR 140, Wisconsin Administrative Code. The PAL serves as a cleanup goal, as a means to inform agencies of potential groundwater contamination problems and as a basis for facility design and management criteria to minimize and prevent groundwater contamination.
- Private Potable: A private water system supplying water for human consumption, sanitary use or for the preparation of food or pharmaceutical products.
- Sample Analytical Data: Shows detailed information about the groundwater sample that was collected from a well. Groundwater samples are usually analyzed only for those substances that are of interest or concern to the person collecting or requesting the sample.
- Sample Analytical Qualifier: A code or text that further describes a sample analytical result.
- Sample Analytical Result: The concentration of a substance in a groundwater sample as measured by a laboratory or field instrument. The concentration is expressed as a unit of measure such as milligrams per liter (mg/L) or micrograms per liter (ug/L).
- Sample Collection Date: The date on which the well sample was collected.
- Sample ID: The identification number or code assigned by a lab to a sample for unique identification.
- Static Water Level: The level of the surface of the water in a well or water pressure at the top of a well, when no water flows or is being pumped. For flowing wells with a positive water pressure at the top of a well, the static water elevation is determined by a stilling pipe or pressure gauge. Water levels are referenced to the elevation of the top of the well or the established ground surface at the well.
- Storet Parameter Code: Five character numeric code assigned by the EPA for each chemical compound.
- Transient Non-community: The lowest concentration of a substance that can be determined to be significantly different from zero.
- WI Unique Well Number: A number assigned to new wells in Wisconsin since 1988. The number is used to keep track of groundwater quality in a specific well over time and is tied to well location and construction information. It is made up of two or three alphabetic characters followed by three numeric characters (e.g. AB123).
- Unspecified Non-community: A public water system that is not a community water system. Examples include schools, waysides and restaurants.
- Various/miscellaneous: Wells for which GRN is unable to determine a well use.
- Watershed: A geographic unit delineated by surface water drainage.