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Layer: Dipping Bedrock (0)

Name: Dipping Bedrock

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Description: Data Type: Static. Vintage: Per Board of County Commissioners (BCC) resolution CC95-134, dated April 11, 1995.The Designated Dipping Bedrock Area (DDBA) defines an area of Jefferson county where heaving bedrock is possible under certain geological and human-influenced conditions. Special consideration is warranted in all phases of development including site exploration and evaluation, facilities design, construction, and subsequent maintenance. In some areas, avoidance may be the best mitigation method.Heaving Bedrock Geological HazardHistorically, a high rate of damage to roads, utilities, and lightly loaded structures has occurred where steeply dipping beds of expansive claystone bedrock is found near the ground surface. In such areas, ridges of “heaving bedrock”, as large as two feet high, several tens of feet wide, and several hundreds of feet long have been mapped. The ridges form where adjacent, dipping layers of bedrock, each possessing a different potential for expansion, are exposed to water. Damage from heaving bedrock typically is seen within ten years after development and ground deformations may continue for year or decades. This geological hazard is responsible for tens of millions of dollars in excess of maintenance costs to county taxpayers and homeowners. Compared to damage caused by flat-lying expansive soils and bedrock, which are found to the east over much of the Denver metropolitan area, heaving bedrock problems are more complex in nature and difficult to predict, and the resulting damage is often more localized and destructive.Considerations for Proposed and Existing SubdivisionsThe Designated Dipping Bedrock Area (DDBA) contains many areas where geological conditions are favorable for development, and where satisfactory performance of homes and other facilities has occurred. Detailed geological/geotechnical investigations should be conducted for proposed developments within the DDBA to delineate areas where favorable conditions occur, such as thick alluvial soils or layers of nonexpansive bedrock. Special mitigative designs must be employed where zones of potentially heaving bedrock are encountered. Existing subdivisions are not subject to most of the overlay district regulations. However, large additions of remedial structural repair work may be subject to minimum foundation design standards and special review by the Building Department. Potential home buyers should be aware that the distribution of areas of damage within the DDBA may be erratic. A home that exhibits structural damage may be located next to other homes that have no damage. When purchasing an existing home within the map area, or any other expansive soil area, the buyer should have a structural engineer conduct a detailed evaluation of the home to ensure that it is structurally sound.Geology and BoundariesThe DDBA contains eight sedimentary formations of Cretaceous age, including the Graneros Shale, Greenhorn Limestone, Carlile Shale, Niobrara Formation, Pierre Shale, Fox Hills Sandstone, and Laramie Formation, and parts of the Arapahoe/Denver/Dawson Formations. The western boundary corresponds to the contact between the Graneros Shale and the underlying Dakota Sandstone on the eastern dip slope of the hogback ridge or near Golden where these units are missing due to faulting, to the mapped location of the Golden Fault. The eastern boundary corresponds roughly to the eastern extent of bedrock which dips at greater than 30 degrees from horizontal. Bedrock layers underlying the DDBA dip to the east or northeast at 30 to 90 degrees from horizontal. The map does not show internal contacts between different bedrock formations, nor does it attempt to delineate areas of natural alluvial deposits that may cover and significantly reduce the heaving potential of the bedrock. Data is in State Plane Grid Coordinates, Colorado Central Zone, NAD83.

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Copyright Text: The geological boundaries are derived from the following U.S. Geological Survey 1:24,000 geological quadrangle maps: Eldorado Springs (Wells, 1967; Bull. 1221-D), Louisville (Spencer, 1961; GQ-151), Ralston Buttes (Sheridan et al., 1967; P.P. 520), Golden (Van Horn, 1972; I-761-A), Morrison (Scott, 1972; I-790-A), Fort Logan (Lindvall, 1978; GQ-1427), Indian Hills (Bryant et al., 1973; GQ-1073), Littleton (Scott, 1972; Bull. 1121-L), and Kassler (Scott, 1963; P.P. 421-B).

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Layer: Landslide (1)

Name: Landslide

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Description: Data Type: Static. Vintage: Per Board of County Commissioners by Resolution CC76-144, dated January 20, 1976.Landslide layer is one part of the Geologic Hazard Zoning Overlay District. Other separate GIS Layers that are part of the Geologic Hazard Zoning Overlay District are: Slope Failure Complex, Rockfall, and Subsidence . There is an attribute named ZONED with type YES/NO indicating the disposition of each feature in the respective data layer. The features that are not zoned are administered as Geologic Constraints. A definition query can be set in ones’ GIS application to display the information from various viewpoints.HISTORYThe Geologic Hazard Zoning Overlay District of which the Landslide layer is part was established by the Board of County Commissioners by Resolution CC76-144, dated January 20, 1976, and recorded at Book 2865, Page 579, Reception Number 76793807 under zoning case number B76-16. The map data was compiled from 1:24,000 hardcopy maps . Those maps were then digitized by County staff /interns. The bearing – distance files were generated from the digitized courses. The map and course data can be seen in the record documents.REFERENCESGARDNER, M.E., SIMPSON, H.E., and HART, S.S., 1971, Preliminary Engineering Geologic Map of the Golden Golden Quadrangle,Jefferson County, Colorado, U.S.G.S. Map MF-308.HANSEN, W. R., 1973, Effects of the May 5-6, 1973 Storm in the Greater Denver Area, Colorado, U.S.G.S. Circular 689, 20 pp.Landslides and Engineering Practice, 1958, Ed., ESKEL, E.B., Highway Research Board Special Report 29, Washington D.C., 232 pp.REED, J.C. Jr., SHERIDAN, D.M., and BRYANT, B., 1973, Map Showing Faults, Joints, Foliation, and Surficial Deposits in the EvergreenQuadrangle,Jefferson County, Colorado, U.S.G.S. Map I-786-F.ROBINSON, G.S., 1974, Engineering Geologic Report, Landslides on 44thAvenue, East of Golden, Colorado, Prepared for Colorado Division of Highways District 6ROGERS and Others, 1974, Guidelines and Criteria for Identification and Land-Use Controls of Geologic Hazard and Mineral Resource Areas,Special Publication No. 6, Colorado Geological Survey, 146 pp.SCHMIDT, P.W., 1972, Slope Map of the Evergreen Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-786-C.SHERIDAN, DM, REED, J.C., Jr., and BRYANT, B. 1972, Geologic Map of the Evergreen Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-786-A.SIMPSON, H.E., 1973, Map Showing Landslides in the Golden Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-761-B.SIMPSON, H.E., 1973, Map Showing Areas of Potential Rockfalls in the Golden Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-761-C.SCOTT, G.R., 1972, Geologic Map of the Morrison Quadrangle Jefferson County, Colorado, U.S.G.S. Map I-790-A.SCOTT, G.R., 1972, Map Showing Landslides and Areas Susceptible to Landsliding in the Morrison Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-790-B.SLOSSON, J.E., 1969, The Role of Engineering Geology in Urban Planning, Special Publication No. 1, Colorado Geological Survey, pp. 8-15.VAN HORN, R., 1972, Surficial and Bedrock Geologic Map of the Golden Quadrangle,Jefferson County, Colorado, U.S.G.S. Map I-761-A.Note: Within the above documents are included many additional references relating to the preparation of the Geologic Hazard Zoning Maps. SPECIFICSData is in State Plane Grid Coordinates, Colorado Central Zone, NAD83.

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Copyright Text: Credit Jefferson County Planning & Zoning in any use of this data.

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Layer: Methane Gas Area (2)

Name: Methane Gas Area

Display Field: LOC_NAME

Type: Feature Layer

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Description: Data Type: Static. Vintage: 1980 (single source report)The investigation was undertaken in 1980 using Health Department records, interviews with landfill personnel and residents, aerial photography and field visits. Then a methane gas meter with bar hole punch was used to establish methane levels. The polygon outline was positioned using roads and key features of the site illustrations along with aerial photography.Data is in State Plane Grid Coordinates, Colorado Central Zone, NAD83.

Service Item Id: 23065afff6f14017bf530fe511fc3036

Copyright Text: Credit the Jefferson County Health Department report authored by D. Ryan and W. Dorrance, 1980.

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Layer: Rockfall (3)

Name: Rockfall

Display Field: AREA_

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Description: Data Type: Static. Vintage: Per Board of County Commissioners by Resolution CC76-144, dated January 20, 1976.Rockfall Layer is one part of the Geologic Hazard Zoning Overlay District. Other separate GIS Layers that are part of the Geologic Hazard Zoning Overlay District are: Landslide , Slope Failure Complex , and Subsidence . There is an attribute named ZONED with type YES/NO indicating the disposition of each feature in the respective data layer. The features that are not zoned are administered as Geologic Constraints. A definition query can be set in ones’ GIS application to display the information from various viewpoints.Data is in State Plane Grid Coordinates, Colorado Central Zone, NAD83.HISTORYThe Geologic Hazard Zoning Overlay District of which the Rockfall Layer is part was established by the Board of County Commissioners by Resolution CC76-144, dated January 20, 1976, and recorded at Book 2865, Page 579, Reception Number 76793807 under zoning case number B76-16. The map data was compiled from 1:24,000 hardcopy maps . Those maps were then digitized by County staff /interns. The bearing – distance files were generated from the digitized courses. The map and course data can be seen in the record documents.REFERENCESGARDNER, M.E., SIMPSON, H.E., and HART, S.S., 1971, Preliminary Engineering Geologic Map of the Golden Golden Quadrangle,Jefferson County, Colorado, U.S.G.S. Map MF-308.HANSEN, W. R., 1973, Effects of the May 5-6, 1973 Storm in the Greater Denver Area, Colorado, U.S.G.S. Circular 689, 20 pp.Landslides and Engineering Practice, 1958, Ed., ESKEL, E.B., Highway Research Board Special Report 29, Washington D.C., 232 pp.REED, J.C. Jr., SHERIDAN, D.M., and BRYANT, B., 1973, Map Showing Faults, Joints, Foliation, and Surficial Deposits in the EvergreenQuadrangle,Jefferson County, Colorado, U.S.G.S. Map I-786-F.ROBINSON, G.S., 1974, Engineering Geologic Report, Landslides on 44thAvenue, East of Golden, Colorado, Prepared for Colorado Division of Highways District 6ROGERS and Others, 1974, Guidelines and Criteria for Identification and Land-Use Controls of Geologic Hazard and Mineral Resource Areas,Special Publication No. 6, Colorado Geological Survey, 146 pp.SCHMIDT, P.W., 1972, Slope Map of the Evergreen Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-786-C.SHERIDAN, DM, REED, J.C., Jr., and BRYANT, B. 1972, Geologic Map of the Evergreen Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-786-A.SIMPSON, H.E., 1973, Map Showing Landslides in the Golden Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-761-B.SIMPSON, H.E., 1973, Map Showing Areas of Potential Rockfalls in the Golden Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-761-C.SCOTT, G.R., 1972, Geologic Map of the Morrison Quadrangle Jefferson County, Colorado, U.S.G.S. Map I-790-A.SCOTT, G.R., 1972, Map Showing Landslides and Areas Susceptible to Landsliding in the Morrison Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-790-B.SLOSSON, J.E., 1969, The Role of Engineering Geology in Urban Planning, Special Publication No. 1, Colorado Geological Survey, pp. 8-15.VAN HORN, R., 1972, Surficial and Bedrock Geologic Map of the Golden Quadrangle,Jefferson County, Colorado, U.S.G.S. Map I-761-A.Note: Within the above documents are included many additional references relating to the preparation of the Geologic Hazard Zoning Maps. SPECIFICSData is in State Plane Grid Coordinates, Colorado Central Zone, NAD83.

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Copyright Text: Credit Jefferson County Planning & Zoning in any use of this data.

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Layer: Slope Failure USGS 1999 (4)

Name: Slope Failure USGS 1999

Display Field: ZONED

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Description: Data Type: Static. Vintage: Per Board of County Commissioners by Resolution CC76-144, dated January 20, 1976.Slope Failure Complex GIS Layer is one part of the Geologic Hazard Zoning Overlay District. Other separate GIS Layers that are part of the Geologic Hazard Zoning Overlay District are: Landslide , Rockfall , and Subsidence . There is an attribute named ZONED with type YES/NO indicating the disposition of each feature in the respective data layer. The features that are not zoned are administered as Geologic Constraints. A definition query can be set in ones’ GIS application to display the information from various viewpoints.HISTORYThe Geologic Hazard Zoning Overlay District of which the Slope Failure Complex is part was established by the Board of County Commissioners by Resolution CC76-144, dated January 20, 1976, and recorded at Book 2865, Page 579, Reception Number 76793807 under zoning case number B76-16. The map data was compiled from 1:24,000 hardcopy maps . Those maps were then digitized by County staff /interns. The bearing – distance files were generated from the digitized courses. The map and course data can be seen in the record documents.REFERENCESGARDNER, M.E., SIMPSON, H.E., and HART, S.S., 1971, Preliminary Engineering Geologic Map of the Golden Golden Quadrangle,Jefferson County, Colorado, U.S.G.S. Map MF-308.HANSEN, W. R., 1973, Effects of the May 5-6, 1973 Storm in the Greater Denver Area, Colorado, U.S.G.S. Circular 689, 20 pp.Landslides and Engineering Practice, 1958, Ed., ESKEL, E.B., Highway Research Board Special Report 29, Washington D.C., 232 pp.REED, J.C. Jr., SHERIDAN, D.M., and BRYANT, B., 1973, Map Showing Faults, Joints, Foliation, and Surficial Deposits in the EvergreenQuadrangle,Jefferson County, Colorado, U.S.G.S. Map I-786-F.ROBINSON, G.S., 1974, Engineering Geologic Report, Landslides on 44thAvenue, East of Golden, Colorado, Prepared for Colorado Division of Highways District 6ROGERS and Others, 1974, Guidelines and Criteria for Identification and Land-Use Controls of Geologic Hazard and Mineral Resource Areas,Special Publication No. 6, Colorado Geological Survey, 146 pp.SCHMIDT, P.W., 1972, Slope Map of the Evergreen Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-786-C.SHERIDAN, DM, REED, J.C., Jr., and BRYANT, B. 1972, Geologic Map of the Evergreen Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-786-A.SIMPSON, H.E., 1973, Map Showing Landslides in the Golden Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-761-B.SIMPSON, H.E., 1973, Map Showing Areas of Potential Rockfalls in the Golden Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-761-C.SCOTT, G.R., 1972, Geologic Map of the Morrison Quadrangle Jefferson County, Colorado, U.S.G.S. Map I-790-A.SCOTT, G.R., 1972, Map Showing Landslides and Areas Susceptible to Landsliding in the Morrison Quadrangle, Jefferson County, Colorado, U.S.G.S. Map I-790-B.SLOSSON, J.E., 1969, The Role of Engineering Geology in Urban Planning, Special Publication No. 1, Colorado Geological Survey, pp. 8-15.VAN HORN, R., 1972, Surficial and Bedrock Geologic Map of the Golden Quadrangle,Jefferson County, Colorado, U.S.G.S. Map I-761-A.Other SPECIFICSData is in State Plane Grid Coordinates, Colorado Central Zone, NAD83.

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Copyright Text: Credit Jefferson County Planning & Zoning in any use of this data.

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Layer: Subsidence (5)

Name: Subsidence

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Description: Data Type: Static. Vintage: Per Board of County Commissioners by Resolution CC82-691, dated September 7, 1982 and added to in 1985.The Subsidence Layer is one part of the Geologic Hazard Zoning Overlay District. Other separate GIS Layers that are part of the Geologic Hazard Zoning Overlay District are: Landslide , Rockfall, and Slope Failure Complex . There is an attribute named ZONED with type YES/NO indicating the disposition of each feature in the respective data layer. The features that are not zoned are administered as Geologic Constraints. A definition query can be set in ones’ GIS application to display the information from various viewpoints.HISTORYThe Geologic Hazard Zoning Overlay District of which the The Subsidence Layer is part was established by the Board of County Commissioners by Resolution CC82-691, dated September 7, 1982, recorded at Book 2865, Page 579, Reception Number 82063167 under zoning case number Z82-22. Also, Case Z85-3 modified the Geologic Hazard Zoning Overlay District on July 1, 1985 by the BCC and is recorded at reception number 85063980. The map data for these two cases was compiled from studies conducted by engineering consulting firms. The course data can be found in the record documents.REFERENCESVarious Engineering and Geologic reports from Consulting Firms were used to develop this zoning overlay and geologic constraints for subsidence. SPECIFICSData is in State Plane Grid Coordinates, Colorado Central Zone, NAD83.

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Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:
XMin: -1.1720496524500001E7
YMin: 4793717.954099998
XMax: -1.16993010963E7
YMax: 4852444.799599998
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)



Drawing Info:
Renderer:
Unique Value Renderer:
Field 1: ZONED
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: N
  Label: N
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [0, 168, 132, 255]
  Outline:
  Style: esriSLSSolid
  Color: [137, 90, 68, 255]
  Width: 0
• Value: Y
  Label: Y
  Description: N/A
  Symbol:
  Style: esriSFSSolid
  Color: [230, 0, 0, 255]
  Outline:
  Style: esriSLSSolid
  Color: [137, 90, 68, 255]
  Width: 0
Transparency: 0
Labeling Info:
Feature Draw Order:
N/A
Advanced Query Capabilities:
Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: true
Supports Sql Format: false
Supports Query Analytic: false
Supports Query With Current User: true


HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:
• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• ZONED ( type: esriFieldTypeString, alias: ZONED, length: 3 )
• AREA_ID ( type: esriFieldTypeString, alias: AREA_ID, length: 7 )
• Shape_Length ( type: esriFieldTypeDouble, alias: Shape_Length )
• Shape_Area ( type: esriFieldTypeDouble, alias: Shape_Area )