The Minimum Set of Data Elements [ MSDE ] for Ground Water Quality
The MSDE is comprised of 21 data elements that are divided into the following four categories or descriptors; the general descriptor - describes where the well information is maintained; the geographic descriptors - describe a well or spring in relation to the earth's surface; the well descriptors - describe various features of a well or spring; and the sample descriptors - describe different aspects of collecting, analyzing and recording the results of a ground water sample.
1. Data Sources - The names of the organizations to direct questions regarding the following data: (1) latitude and longitude coordinates, (2) altitude, (3) well log information, (4) sample collection and (5) laboratory sample analyses.
2. Latitude - A coordinate representation that indicates a location on the surface of the earth using the earth's equator as the latitude origin, reported in degrees (D), minutes (M), seconds (S) and fractions of a second in decimal format (if fractions of a second are available). A "+" (plus) symbol represents latitudes north of the equator. A "-" (minus) symbol represents latitudes south of the equator.
3. Longitude - A coordinate representation that indicates a location on the surface of the earth using the prime meridian (Greenwich, England) as the longitude origin, reported in degrees (D), minutes (M), seconds (S) and fractions of a second in decimal format (if fractions of a second are available). A "+" (plus) symbol represents longitudes east of the prime meridian. A "-" (minus) symbol represents longitudes west of the prime meridian.
4. Method Used to Determine Latitude and Longitude - The procedure used to determine the latitude and longitude coordinates (Technology of Method Used), the standard used for three dimensional and horizontal positioning (Reference Datum), the method used for map interpolation (Scale of Map) and the date on which the coordinates were determined (Date). Latitude always precedes longitude.
5. Description of Entity - A textural description of the entity to which the latitude and longitude coordinate refers.
6. Accuracy of Latitude and Longitude Measurement - The quantitative measurement of the amount of deviation from true value present in a measurement (estimate of error). It describes the correctness of a measurement.
7. Altitude - The vertical distance from the National Reference Datum for Altitude to the land surface or other measuring point in feet or meters. If the measuring point is above the National Reference Datum for Altitude, a "+" (plus) sign shall precede the reported altitude value. If the measuring point is below the National Reference Datum for Altitude, a "-" (minus) sign shall precede the reported altitude value.
8. Method Used to Determine Altitude - The method used to determine the altitude value (Altitude Method), the National Reference Datum on which the altitude is based (National Reference Datum for Altitude) and the date the measurement was taken (Altitude Date).
9. State FIPS Code - A Federal Information Processing Standard (FIPS) alphabetic or numeric code to indicate the location of the State (or its equivalent such as territory or province) in which the well is located.
10. County FIPS Code - A Federal Information Processing Standard (FIPS) alphabetic or numeric code to indicate the location of the county (or county equivalent) in which the well is located.
11. Well Identifier - A unique well identifier assigned by the responsible organization.
12. Well Use - The principal current use of the well, or if the well is not currently in use, then the original or principal purpose for its construction.
13. Type of Log - The type of record-keeping log(s) available for a well.
14. Depth of Well at Completion - The depth of the completed well below the land surface or other measuring point, in feet or meters.
15. Screened / Open Interval - The depth below the measuring point to the top and bottom of the open section in a well reported as an interval in feet or meters. The open section may be a well screen, perforated casing or open hole.
16. Sample Identifier - A unique number for each water quality sample collected at a well (Sample Control Number) which references the date (Sample Date), the depth at which each sample is taken reported in feet or meters (Sample Depth) and the time the sample is taken (Sample Time).
17. Depth to Water - The vertical distance between the measuring point and the water surface level at a well, corrected to land surface, where the measuring point is not the land surface. This distance should be reported in feet or meters (Measurement Depth), along with the date and time the measurement was taken (Measurement Date and Measurement Time).
18. Constituent or Parameter Measured - Measurement of a physical, chemical or biological component. The physical, chemical or biological components are referred to as constituents or parameters.
19. Concentration / Value - The analytical results value, the units of measure used (Analytical Concentration / Value) and the analytical method applied (Analytical Method) to the samples collected.
20. Analytical Results Qualifier - Qualifying information that will assist in the interpretation of the concentration / value, such as whether the value is below the detectable limit or if the constituents (parameters) of interest are present but cannot be quantified.
21. Quality Assurance Indicator - The quality assurance of the field protocol plan and laboratory quality assurance / quality control (QA / QC) procedures
TABLE OF CONTENTS
Chapter 1. Introduction
Chapter 2. Overview of Petition Processing
Chapter 3. Phase I - Petition Preparation
Chapter 4. Phase II - Initial Petition Review / Determination of Completeness
Chapter 5. Phase III - Detailed Review / Technical Verification
Chapter 6. Phase IV - Designation Determination
A. Sole Source Aquifer Definitions
B. Sole Source Fact Sheet
C. Sources of Technical Information
D. EPA Regional Contacts
E. Completeness Determination Checklist
F. Statements of Meaning--Minimum Set of Data Elements for Wells
G. Section 1424(e) Safe Drinking Water Act