Selected geologic data for wells and test holes in and near the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Arnold, L.R.

Publication_Date: 2010

Title:

Selected geologic data for wells and test holes in and near the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: U.S. Geological Survey Data Series

Issue_Identification: 507

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geoligical Survey

Online_Linkage: <http://water.usgs.gov/lookup/getspatial?ds507_regolith_data>

Larger_Work_Citation:

Citation_Information:

Originator: Arnold, L.R.

Publication_Date: 2010

Title:

Geographic information datasets of regolith-thickness data, regolith-thickness contours, raster-based regolith thickness, and aquifer-test and specific-capacity data for the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado.

Series_Information:

Series_Name: U.S. Geological Survey Data Series

Issue_Identification: 507

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Other_Citation_Details:

Arnold, L.R., 2010, Geographic information datasets of regolith-thickness data, regolith-thickness contours, raster-based regolith thickness, and aquifer-test and specific-capacity data for the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado: U.S. Geological Survey Data Series 507.

Online_Linkage: <http://pubs.usgs.gov/ds/507/>

Larger_Work_Citation:

Citation_Information:

Originator: Arnold, L.R.

Publication_Date: 2010

Title:

Hydrogeology and steady-state numerical simulation of groundwater flow in the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado.

Series_Information:

Series_Name: U.S. Geological Survey Scientific-Investigations Report

Issue_Identification: 2010-5082

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Other_Citation_Details:

Arnold, L.R., 2010, Hydrogeology and steady-state numerical simulation of groundwater flow in the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado: U.S. Geological Survey Scientific-Investigations Report 2010-5082.

Online_Linkage: <http://pubs.usgs.gov/sir/2010/5082/>

Description:

Abstract:

This point dataset contains geologic information concerning regolith thickness and top-of-bedrock altitude at selected well and test-hole locations in and near the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado. Data were compiled from published reports, consultant reports, and from lithologic logs of wells and test holes on file with the U.S. Geological Survey and the Colorado Division of Water Resources. The U.S. Geological Survey prepared this dataset in cooperation with the Colorado Geological Survey and the Lost Creek Ground Water Management District.

Purpose:

This dataset is 1 of 4 datasets (see cross references) developed in support of U.S. Geological Survey Scientific-Investigations Report 2010-5082. The purpose of this dataset is to provide information about regolith thickness and altitude of the top-of-bedrock surface underlying regolith in the Lost Creek Designated Ground Water Basin. Points in the dataset were used as the basis for preparing contour lines of equal regolith thickness shown in the dataset ds507_regthick_contours.

Supplemental_Information:

The Lost Creek Designated Ground Water Basin is an alluvial valley-fill aquifer in northeastern Colorado that is an important water source for irrigation, municipal, and domestic uses.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2010

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -104.566938

East_Bounding_Coordinate: -104.185506

North_Bounding_Coordinate: 40.305595

South_Bounding_Coordinate: 39.680017

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: inlandWaters

Theme_Keyword: aquifer

Theme_Keyword: regolith

Theme_Keyword: unconsolidated sediments

Place:

Place_Keyword_Thesaurus: Getty Thesaurus of Geographic Names

Place_Keyword: Lost Creek

Place_Keyword: Weld County

Place_Keyword: Adams County

Place_Keyword: Arapahoe County

Place_Keyword: Colorado

Stratum:

Stratum_Keyword_Thesaurus: Dictionary of Geologic Terms

Stratum_Keyword: groundwater

Stratum_Keyword: basin

Access_Constraints: None.

Use_Constraints: None.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: L.R. Arnold

Contact_Position: Hydrologist

Contact_Address:

Address_Type: mailing address

Address: Denver Federal Center

Address: P.O. Box 25046

Address: MS 415

City: Denver

State_or_Province: CO

Postal_Code: 80225-0046

Country: USA

Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK USGS)

Contact_Electronic_Mail_Address:

<http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds507_regolith_data>

Security_Information:

Security_Classification_System: Department of the Interior

Security_Classification: Unclassified

Security_Handling_Description: Data are published and available online.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3500

Cross_Reference:

Citation_Information:

Originator: Arnold, L.R.

Publication_Date: 2010

Title:

Contours of equal regolith thickness for the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: U.S. Geological Survey Data Series

Issue_Identification: 507

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geoligical Survey

Online_Linkage: <http://water.usgs.gov/lookup/getspatial?ds507_regthick_contours>

Cross_Reference:

Citation_Information:

Originator: Arnold, L.R.

Publication_Date: 2010

Title:

Raster-based regolith thickness of the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name: U.S. Geological Survey Data Series

Issue_Identification: 507

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Online_Linkage: <http://water.usgs.gov/lookup/getspatial?ds507_regthk>

Cross_Reference:

Citation_Information:

Originator: Arnold, L.R.

Publication_Date: 2010

Title:

Selected aquifer-test and specific-capacity data for wells in the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: U.S. Geological Survey Data Series

Issue_Identification: 507

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Online_Linkage: <http://water.usgs.gov/lookup/getspatial?ds507_welltest_data>

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Regolith-thickness data were compiled from Bjorklund and Brown (1957), Nelson, Haley, Patterson, and Quirk, Inc. (1967), HRS Water Consultants, Inc., written commun. (2006), Hurr and others (1972), Skinner (1963), and lithologic logs from wells and test holes on file with the Colorado Division of Water Resources and the U.S. Geological Survey Colorado Water Science Center. In some places, weathered bedrock may have been mapped as regolith because of inaccurate lithologic logs or an indistinct contact between regolith and the underlying bedrock. In particular, lithologic logs of deep wells completed in bedrock were used to map regolith thickness in the southern part of the Lost Creek basin where few other data were available, and regolith thickness determined from these logs might not be accurate because they commonly lacked detailed regolith information.
Land-surface altitude was derived from information provided by the original source or estimated by using 1:24,000-scale topographic maps. Regolith thickness was estimated from lithologic logs or from information provided by the original data source specified in the SOURCE attribute field. Altitude of the top of bedrock was derived by subtracting regolith thickness from the land-surface altitude.

Quantitative_Attribute_Accuracy_Assessment:

Attribute_Accuracy_Value: unknown

Attribute_Accuracy_Explanation:

Accuracy of regolith-thickness data is variable depending on the accuracy of lithologic logs used to estimate regolith thickness.

Logical_Consistency_Report:

Point attributes for this dataset are consistent in meaning, although the attribute information was derived from multiple sources indicated in the SOURCE attribute. All points were processed by a single individual to ensure data consistency.

Completeness_Report:

Data were digitized and plotted manually on-screen based on location information provided by the original data source. Digital raster graphic topographic maps having a scale of 1:24,000 with a contour interval of 10 feet were used to determine approximate site locations. Site locations were plotted with consideration of existing structures (such as buildings, wells, and windmills), reported land-surface altitude, and reported distances from section lines. The eastern, western, and southern extent of the dataset is defined by the topographic boundary of the Lost Creek drainage basin The northern extent of the dataset is defined by an arbitrary line about one mile north of the northernmost limit of the Lost Creek Designated Ground Water Basin.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Horizontal accuracy is variable. Data were plotted using Public Land Survey System descriptions and 1:24,000 digital raster graphics. Data from the Colorado Division of Water Resources generally are assumed to be accurately located because, in most cases, they were plotted using reported distances from section lines. For other data, the locations generally were described to the nearest quarter-quarter-quarter section. Other locations were described to the nearest 4th or 5th quarter section. Some data descriptions, however, were only to the nearest quarter. Ancillary data, such as reported land-surface elevation and structures (such as buildings, wells, and windmills) shown on topographic maps were used to refine data locations. In cases where ancillary data were not available, data points were plotted near the center of the nearest quarter described by the data source.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 330

Horizontal_Positional_Accuracy_Explanation:

Maximum horizontal error is estimated as 1/2 section, or about 2,640 feet (only 1 point, SB00206215, potentially could be this inaccurate). However, horizontal accuracy of most points is estimated as better than about 330 feet (1/4, 1/4, 1/4 section). Accuracy is estimated on the basis of reported Public Land Survey System accuracy (number of quarters provided by original source).

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Vertical accuracy of the top-of-bedrock altitude is variable depending on the accuracy of lithologic logs used to estimate regolith thickness and determine top of bedrock.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 5

Vertical_Positional_Accuracy_Explanation:

Vertical accuracy of the land-surface altitude is assumed to be within half a contour interval shown on 1:24,000-scale U.S. Geological Survey topographic maps, or 5 feet.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 1957

Title:

Geology and ground-water resources of the lower South Platte River valley between Hardin, Colorado, and Paxton, Nebraska

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: U.S. Geological Survey Water-Supply Paper

Issue_Identification: 1378

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Other_Citation_Details:

Bjorklund L.J.and Brown, R.F., 1957, Geology and ground-water resources of the lower South Platte River valley between Hardin, Colorado, and Paxton, Nebraska: U.S. Geological Survey Water-Supply Paper 1378, 431 p., 4 pls.

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1957

Source_Currentness_Reference: geologic condition

Source_Citation_Abbreviation: Bjorklund and Brown, 1957

Source_Contribution:

Source for well and test-hole locations and regolith-thickness information.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Nelson, Haley, Patterson, and Quirk, Inc.

Publication_Date: 1967

Title:

Ground water resources of the Lost Creek drainage basin, Weld, Adams, and Arapahoe Counties, Colorado

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: none

Issue_Identification: none

Publication_Information:

Publication_Place: unpublished

Publisher: unpublished

Other_Citation_Details:

Nelson, Haley, Patterson, and Quirk, Inc., 1967, Ground water resources of the Lost Creek drainage basin, Weld, Adams, and Arapahoe Counties, Colorado: Report prepared for the Colorado Ground Water Commission, 32 p., 3 pls.

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1967

Source_Currentness_Reference: geologic condition

Source_Citation_Abbreviation: NHPQ, 1967

Source_Contribution:

Source for well and test-hole locations and regolith-thickness information.

Source_Information:

Source_Citation:

Citation_Information:

Originator: HRS Water Consultants, Inc.

Publication_Date: 2006

Title: HRS Water Consultants, Inc., written communication

Series_Information:

Series_Name: none

Issue_Identification: none

Publication_Information:

Publication_Place: unpublished

Publisher: unpublished

Other_Citation_Details: HRS Water Consultants, Inc., written commun. (2006)

Type_of_Source_Media: written communication

Source_Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 1997

Single_Date/Time:

Calendar_Date: 1999

Source_Currentness_Reference: geologic condition

Source_Citation_Abbreviation: HRS, 2006

Source_Contribution:

Source for well and test-hole locations and regolith-thickness information.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 1972

Title:

Hydrogeologic characteristics of the valley-fill aquifer in the Weldona reach of the South Platte River valley, Colorado

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: U.S. Geological Survey Open-File Report

Issue_Identification: 73-127

Publication_Information:

Publication_Place: Reston, VA

Publisher: U.S. Geological Survey

Other_Citation_Details:

Hurr, R.T., Schneider, P.A., Jr., and others, 1972, Hydrogeologic characteristics of the valley-fill aquifer in the Weldona reach of the South Platte River valley, Colorado: U.S. Geological Survey Open-File Report 73-127, 2 p. 6 pl.

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1972

Source_Currentness_Reference: geologic condition

Source_Citation_Abbreviation: Hurr and others, 1972

Source_Contribution:

Source for well and test-hole locations and regolith-thickness information.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Colorado Agricultural Experiment Station

Publication_Date: 1963

Title:

Artificial ground-water recharge in the Prospect Valley area, Colorado

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: General Series

Issue_Identification: 792

Publication_Information:

Publication_Place: Fort Collins

Publisher: Colorado Agricultural Experiment Station

Other_Citation_Details:

Skinner, M.M., 1963, Artificial groundwater recharge in the Prospect Valley area, Colorado: Colorado Agricultural Experiment Station General Series 792, 89 p.

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1963

Source_Currentness_Reference: geologic condition

Source_Citation_Abbreviation: Skinner, 1963

Source_Contribution:

Source for well and test-hole locations and regolith-thickness information.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Colorado Division of Water Resources

Publication_Date: Unpublished material

Title: Colorado Division of Water Resources well-permit database

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: none

Issue_Identification: none

Publication_Information:

Publication_Place: unpublished publicly available data

Publisher: unpublished publicly available data

Other_Citation_Details: Colorado Division of Water Resources well-permit database.

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2009

Source_Currentness_Reference: geologic condition

Source_Citation_Abbreviation: CDWR

Source_Contribution: Source for well locations and regolith-thickness information.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: unknown

Title: U.S. Geological Survey well records

Geospatial_Data_Presentation_Form: document

Series_Information:

Series_Name: none

Issue_Identification: none

Publication_Information:

Publication_Place: unpublished publicly available data

Publisher: unpublished publicly available data

Other_Citation_Details:

U.S. Geological Survey well records, available from the Colorado Water Science Center. Some data from these records are published online.

Online_Linkage: <http://co.water.usgs.gov/Website/projects/viewer.htm>

Type_of_Source_Media: paper

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2009

Source_Currentness_Reference: geologic condition

Source_Citation_Abbreviation: USGS

Source_Contribution:

Source of well and test-hole locations and regolith-thickness information.

Process_Step:

Process_Description:

Data were manually digitized (on-screen) in the ArcMap editing environment based on location information provided by the original data source using, as a backdrop, 1:24,000 digital raster graphic topographic maps.
The following attributes were added to the point dataset: WELL_ID, LOCATION, LAND_ALT, THICKNESS, THICK_QLFR, BR_ALT, BR_QLFR, REMARK, and SOURCE. Regolith-thickness data were compiled from published sources, consultant reports, and lithologic logs of wells and test holes on file with the Colorado Division of Water Resources and the U.S. Geological Survey Colorado Water Science Center.

Source_Used_Citation_Abbreviation: Bjorklund and Brown, 1957

Source_Used_Citation_Abbreviation: NHPQ, 1967

Source_Used_Citation_Abbreviation: HRS, 2006

Source_Used_Citation_Abbreviation: Hurr and others, 1972

Source_Used_Citation_Abbreviation: Skinner, 1963

Source_Used_Citation_Abbreviation: CDWR

Source_Used_Citation_Abbreviation: USGS

Process_Date: 20091020

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: T:\Temp\xml62.tmp

Process_Date: 20100608

Process_Time: 14203800

Process_Step:

Process_Description: Dataset copied.

Source_Used_Citation_Abbreviation:

U:\Lost_Creek\CGS_ASR\Datasets\Lost_Creek_datasets_060810\regolith_data

Process_Date: 20100609

Process_Time: 11002100

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: T:\Temp\xml29.tmp

Process_Date: 20100916

Process_Time: 12315800

Cloud_Cover: 0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 749

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 13

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -105.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000

Ordinate_Resolution: 0.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: National Geodetic Vertical Datum of 1929

Altitude_Resolution: 1

Altitude_Distance_Units: feet

Altitude_Encoding_Method: Implicit coordinate

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: ds507_regolith_data

Entity_Type_Definition: point

Entity_Type_Definition_Source: compiled by USGS from various sources

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: WELL_ID

Attribute_Definition:

Number used to identify well or test-hole site. For data where the SOURCE is CDWR, the WELL_ID refers to the well-permit number.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Unique well identifier from various sources.

Attribute:

Attribute_Label: LOCATION

Attribute_Definition:

Describes site location by township, range, and section. For example, a site located at SC00206321ADB is located in the northwest quarter of the southeast quarter of the northeast quarter of section 21, Township 2 South, Range 63 West. The letter S at the beginning of the number indicates the site is referenced to the Sixth Principal Meridian. The letter C following S indicates the site is a south Township (a letter B following S would indicate a north Township). The eight digits following SC indicate Township number (002), Range number (063), and section (21). Letters following township, range, and section indicate quarter (A), quarter-quarter (D), and quarter-quarter-quarter (B) sections, respectively. The letters A, B, C, and D represent northeast, northwest, southwest, and southeast quarters, respectively.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name:

Coded well identifier including Public Land Survey System (PLSS) information.

Codeset_Source: Department of the Interior

Attribute:

Attribute_Label: LAND_ALT

Attribute_Definition:

Land-surface altitude, in feet. If not provided by the original data source, land-surface altitude was estimated by using digital raster graphic (DRG) topographic maps having a scale of 1:24,000 with a contour interval of 10 feet. Altitudes estimated from DRG topographic maps are in feet and referenced to the National Geodetic Vertical Datum of 1929 (NGVD29). Vertical datum for altitudes provided by the original data source is unknown.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Altitude of land surface at well location.

Attribute:

Attribute_Label: THICKNESS

Attribute_Definition:

Thickness of the regolith (unconsolidated sediments) estimated from lithologic logs or provided by the original data source. Thickness is in feet.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Regolith thickness, in feet.

Attribute:

Attribute_Label: THICK_QLFR

Attribute_Definition:

Thickness qualifier. Some wells or test holes did not extend to bedrock. Therefore, total regolith thickness could not be estimated at these sites. The abbreviation GT indicates that estimated thickness is greater than that shown in THICKNESS

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: GT

Enumerated_Domain_Value_Definition:

Greater than - actual thickness of unconsolidated sediments is greater than the THICKNESS field value because the well did not extend to bedrock.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: null entry

Enumerated_Domain_Value_Definition:

THICKNESS field value can be used as is without qualifier because well did extend to bedrock.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute:

Attribute_Label: BR_ALT

Attribute_Definition:

The altitude, in feet, of the top-of-bedrock surface underlying the regolith was calculated by subtracting regolith thickness from land-surface altitude. Top-of-bedrock altitude is in feet above mean seal level and in the NGVD 1929 (National Geodetic Vertical Datum of 1929).

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Altitude of top of bedrock, in feet.

Attribute:

Attribute_Label: BR_QLFR

Attribute_Definition:

Bedrock-altitude qualifier. Some wells or test holes did not extend to bedrock. Therefore, actual top-of-bedrock altitude could not be estimated at these sites. The abbreviation LT indicates that estimated top-of-bedrock altitude is less than that shown in BR_ALT.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: LT

Enumerated_Domain_Value_Definition:

Less than - top-of-bedrock altitude is less than the value in BR_ALT field because hole did not extend to bedrock.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: null entry

Enumerated_Domain_Value_Definition:

BR_ALT- top-of-bedrock altitude field value can be used as is without qualifier because well extended to bedrock.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute:

Attribute_Label: REMARK

Attribute_Definition:

Additional information related to the site, particularly to the information used from the data source.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Unrepresentable_Domain: Comments text field having multiple possible values.

Attribute_Measurement_Frequency: None planned

Attribute:

Attribute_Label: SOURCE

Attribute_Definition: Source of data.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Bjorklund&Brown, 1957

Enumerated_Domain_Value_Definition:

from Bjorklund, L.J., and Brown, R.F., 1957, Geology and ground-water resources of the lower South Platte River valley between Hardin, Colorado, and Paxton, Nebraska: U.S. Geological Survey Water-Supply Paper 1378, 431 p., 4 pls.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: CDWR

Enumerated_Domain_Value_Definition: Colorado Division of Water Resources well-permit database.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: HRS, 2006

Enumerated_Domain_Value_Definition: HRS Water Consultants, Inc., written commun. (2006)

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Hurr&others,1972

Enumerated_Domain_Value_Definition:

Hurr, R.T., Schneider, P.A., Jr., and others, 1972, Hydrogeologic characteristics of the valley-fill aquifer in the Weldona reach of the South Platte River valley, Colorado: U.S. Geological Survey Open-File Report 73-127, 2 p. 6 pl.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: NHPQ, 1967

Enumerated_Domain_Value_Definition:

Nelson, Haley, Patterson, and Quirk, Inc., 1967, Ground water resources of the Lost Creek drainage basin, Weld, Adams, and Arapahoe Counties, Colorado: Report prepared for the Colorado Ground Water Commission, 32 p., 3 pls.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Skinner, 1963

Enumerated_Domain_Value_Definition:

Skinner, M.M., 1963, Artificial ground-water recharge in the Prospect Valley area, Colorado: Colorado Agricultural Experiment Station General Series 792, 89 p.

Enumerated_Domain_Value_Definition_Source: USGS

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: USGS

Enumerated_Domain_Value_Definition:

Well records on file with the U.S. Geological Survey Colorado Water Science Center.

Enumerated_Domain_Value_Definition_Source: USGS

Overview_Description:

Entity_and_Attribute_Overview:

Attributes of the dataset include the well identifier, location, land-surface altitude, thickness of regolith (unconsolidated sediments) estimated from lithologic logs or provided by the data source, a calculated top-of-bedrock altitude, remarks, and data source.

Entity_and_Attribute_Detail_Citation:

Arnold, L.R., 2010, Geographic information datasets of regolith-thickness data, regolith-thickness contours, raster-based regolith thickness, and aquifer-test and specific-capacity data for the Lost Creek Designated Ground Water Basin, Weld, Adams, and Arapahoe Counties, Colorado: U.S. Geological Survey Data Series 507.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Ask USGS

Contact_Position: Ask USGS -- Water Webserver Team

Contact_Address:

Address_Type: mailing address

Address: 445 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)

Contact_Electronic_Mail_Address:

<http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds507_regolith_data>

Resource_Description: Downloadable Data

Distribution_Liability:

Although this dataset has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: shapefile

Format_Version_Number: ArcGIS 9.3

Format_Specification: shapefile

File_Decompression_Technique: no compression applied

Transfer_Size: 156 KB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://water.usgs.gov/GIS/dsdl/ds507_regolith_data.zip>

Online_Computer_and_Operating_System: NA

Offline_Option:

Offline_Media: CD-ROM

Recording_Format: ISO-9660

Fees: None. This dataset is provided by USGS as a public service.

Ordering_Instructions: <http://ask.usgs.gov/>

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2010

Metadata_Reference_Information:

Metadata_Date: 20100811

Metadata_Review_Date: 20091030

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Ask USGS

Contact_Position: Ask USGS -- Water Webserver Team

Contact_Address:

Address_Type: mailing address

Address: 445 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Voice_Telephone: 1-888-275-8747 (1-888-ASK-USGS)

Contact_Electronic_Mail_Address:

<http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds507_regolith_data>

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998