GRAVEL PITS

Field	Description
Main ID Information	Metadata Updated 2007
Title	Benton County Aggregate Evaluation - Gravel Pits
Filename	Gvl_pits (ArcView Shapefile)
Abstract	This dataset consists of locational information about the gravel pits and quarries within Benton County.
Place Keywords	Benton County, Minnesota
Theme Keywords	Gravel Pits, Quarries
Time Period of Content	Fall 2001 – Spring 2002
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	Department of Natural Resources, Division of Lands and Minerals, Mineral Potential Section
Purpose	To display the gravel pit and quarry locations within Benton County.
Progress	Complete
Currentness Reference	All data was gathered in the late fall of 2000 and the summer and fall of 2001 and compiled in the fall of 2001 through the spring of 2002.
Maintenance Frequency	None planned
Access Constraints	NA
Use Constraints	NA
Associated Data Sets	NA
Data Quality
Attribute Accuracy	These points were digitized in ArcView (on screen digitizing) from DRGs (USGS Digital Raster Graphic files of 1:24,000 topographic maps), 1:12,000 USGS DOQs (Aerial Photographs), soil maps, and the ASIS Database from the Minnesota Department of Transportation.
Logical Consistency	NA
Completeness	Described in “lineage” below.
Horizontal Positional Accuracy	1:24000
Vertical Positional Accuracy	NA
Lineage	These points were gathered from a variety of sources, some were digitized to within a few meters, others were located on DOQs (Digital Orthophoto Quadrangles) and DRGs with on screen digitizing. The gravel pits and quarries are fairly large, thus the points are located somewhere in the disturbed area, and should be very accurate.
Source Scale Denominator	1:24000
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	NA
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	This dataset consists of location information about the gravel pits and quarries within Benton County. This shapefile can be joined to dotqual.dbf and dotsieve.dbf to get more information about the gravel pits that list the Source as “MNDOT ASIS”.
Entity-Attribute Detailed Citation	ArcView specific fields include shape (i.e., feature type = point), area (0 for points), perimeter (0 for points), gvl_pits_ (unique id for point, assigned by the software), gvl_pits_id (an id usually assigned during theme creation). Gravel pit specific attributes are described in the table below.

Table Name	Field Name	Begin Column	Definition	Valid Values	Descriptions
Gvl_pits.shp	Pit_q_id		Number, 3,0	Ex: 1,2,3,4,5,6,7.... 341, 342, 343, 344	Gravel pit and quarry unique ID (1-344).
	Source		Text, 16	Ex: MNDOT ASIS, Air photo, Field Work, Soil Survey, Topographic Map, etc…	This is where the gravel pit location came from or was observed (ex: soil - found on the soil map).
	Type		Text, 16	Gravel Pit	Gravel Pit
				Quarry	Quarry
	ASIS_numbr		Number, 5,0	Ex: 0, 5001, 5005.. ..5049.	Aggregate Source Information System Number (MN/DOT Database). 0 means that is does not have an ASIS number. 5xxx refers to Benton County (5) and xxx refers to the pit number. Use this field to join with dot_qual.dbf on sourcexx for the gravel pits that list the Source as “ASIS”.
	Size		Text, 8	Small	Refers to the relative size of the pit or quarry. Small pits are generally less than an acre or so. These pits are usually used by private land owners or for small jobs.
				Medium	Generally less than 10 acres in size. These pits are used by land owners and for small construction jobs, they are generally used for short periods of time by contractors.
				Large	These pits are generally greater than 10 acres and are typically used by commercial aggregate operators.
	Thickness		Text, 8	Ex: >10, >15, >20, >25, >50, etc...	Gives the minimum thickness of the aggregate observed at the pit or quarry.
	Watertable		Text, 8	Ex: >10, >20, >25, 10, 25,<20, etc	Describes the depth to the watertable within a pit or quarry. If 20 feet of gravel was exposed and there was no water table encountered, then >20 was used.