COUNTY WELL INDEX (CWI) - WELL LOCATIONS

Field	Description
Main ID Information	Metadata Updated 2007
Title	Benton County Aggregate Evaluation - County Well Index (CWI- MGS Database)
Filename	Cwi00pt3 (ArcView Shapefile)
Abstract	This dataset consists of the locations of wells drilled within Benton County. The County Well Index (CWI) is a database that contains information about wells drilled throughout Minnesota, this data base was used to look at the geological descriptions of these wells. The information presented here is a subset of the CWI data that was downloaded from the Minnesota Geological Survey (MGS) in 2000.
Place Keywords	Benton County, Minnesota
Theme Keywords	CWI, Wells, County Well Index, Geological Descriptions
Time Period of Content	Downloaded in 2000
Parent Theme	NA
Spatial Extent of the Data	Benton County, Minnesota
Contact Person	Aggregate Resources Mapping Program
Contact Person Organization/Division	Department of Natural Resources, Division of Lands and Minerals
Contact Person Position	Geologist or GIS Specialist
Contact Address	500 Lafayette Road, Box 45
Contact City	St. Paul
Contact Zip Code	55155-4045
Contact Voice Phone	651-259-5959
Contact Fax Phone	651-296-5939
Additional ID Information
Originator	Minnesota Geological Survey
Purpose	This dataset contains the locations of the wells that were used for this study. Approximately 1,000 of the 2,400 wells contained geological descriptions that were used in this study.
Progress	Complete
Currentness Reference	2000
Maintenance Frequency	None planned
Access Constraints	NA
Use Constraints	NA
Associated Data Sets	Cwi_geod: 0ne-to-many (cwi00pt3-to-cwigeod). Relate on unique_no.
Data Quality
Attribute Accuracy	The locational accuracy of these points varies. Some of the points were field checked down to the meter, others are the centroid of a 40, 10, ... acre parcel. See the complete CWI files ordered through the Minnesota Geological Survey for more detail.
Logical Consistency	NA
Completeness	The locational accuracy of these points varies. Some of the points were field checked down to the meter, others are the centroid of a 40, 10, .... acre parcel. See the complete CWI files ordered through the Minnesota Geological Survey for more detail.
Horizontal Positional Accuracy	1:1000
Vertical Positional Accuracy	NA
Lineage	The geological descriptions from these test holes were used to make interpretations and test interpretations about the geology, aggregate resources, and glacial and bedrock history of the area.
Source Scale Denominator	1:1000
Spatial Reference
Horizontal Coordinate Scheme	UTM
Ellipsoid	GRS80
Horizontal Datum	NAD83
Horizontal Units	Meters
Distance Resolution	NA
Altitude Datum	NA
Altitude Units	NA
Depth Datum	NA
Depth Units	NA
UTM Zone Number	15
Raster only
Cell Width	NA
Cell Height	NA
Spatial Data Organization
Geographic Reference for Tabular Data	These points represent individual wells drilled throughout Benton County by a variety of sources.
Native Dataset Environment	ArcView 3.1 / ArcInfo 8.0.2
Vendor Specific Object Type	NA
Tiling Scheme	NA
Spatial Object Type	Point
Transfer Size
Entities -- Attributes
Entity-Attribute Overview	These points represent individual wells drilled throughout Benton County by a variety of sources; referred to as the CWI.
Entity-Attribute Detailed Citation	ArcView specific fields include shape (i.e., feature type = point), area (0 for points), perimeter (0 for points), cwixxpt3_ (unique id for point, assigned by the Arc/INFO software), cwixxpt3_i (an id usually assigned during theme creation). CWI point attributes are described in the table below.

Table Name	Field Name	Begin Column	Definition	Valid Values	Descriptions
Cwixxpt3.shp	Uniq_id		Text, 6	Ex:102304, 102333	These are the unique identifiers for the wells (Relate item with cwi_geod.dbf).
	Twp		Text, 3	Ex: 110, 111,112	Township Number
	Rng		Text, 2	Ex: 27,29,31,32, etc...	Range Number
	Sec		Text, 2	Ex: 1,2,3,4,5,6, etc...	Section number
	Subsec		Text, 6	Ex: ABBCAA	Subsection number (A = NE, B = NW, C = SW, D = SE).
	Dpth_bdrk		Number,11,0	Ex: 0,40, 55, 120, 235, etc…	Describes the depth to the first bedrock encountered. Surface elevation minus bedrock elevation.
	First_bdrk		Text, 4	Ex: KRET, PCCR, UREG	Abbreviation of the first bedrock unit encountered while drilling. The First letter refers to the age of the rock type. (K-Cretaceous, P-Precambrian U – undifferentiated). See MGS CWI database for more details.