Areas Susceptible to Groundwater Contamination

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Frequently anticipated questions:

What does this data set describe?

Title: Areas Susceptible to Groundwater Contamination
Abstract: Areas susceptible to groundwater contamination
Supplemental_Information:
The ASGWC data history: This data set represents the joining of 9 separate analyses for 9 different study areas. In most cases, surficial geology, soils and depth to groundwater were combined in a matrix to determine final susceptibility. SOURCES: Vashon - Maury Island : used new geology from U. of Wa. for PType, (WHPA's, DTW, to update ASGWC susceptibility data July 2007. New susceptibility data from U. of Wa. added for parts of Issaquah and Redmond/Bear Creek data updated Feb. 2008. Schema changes Feb. 2008, added "D_GW"; "RECHARGE" name changed to " SUSCEPT"; "RCH_SUM" changed to "SUSCP_SUM". REDMOND/BEAR CREEK GWMA - EMCON NW Date: 01/01/1992 Scale: Unknown VASHON GWMA - GERACHTY AND MILLER Date: 01/01/1993 Scale: Unknown Date: 01/01/1993 Scale: Unknown SOUTH KING GWMA - ECOMOMIC AND ENGINEERING SERVICES, INC. Date: 01/01/1991 Scale: Unknown EAST KING GWMA - US GEO. SURVEY, TACOMA Date: 01/01/1993 Scale: Unknown LOWER CEDAR S.A. - EMCON NW Date: 01/01/1993 Scale: Unknown ENUMCLAW, HWOLLYWOOD HILLS, AND S. BELLEVUE - KC STAFF(DDES) Date: 01/01/1994 Scale: Unknown MANUSCRIPTION: For all consultant work: please consult the studies. King County Staff interpreted geology, soils, and well log maps for their contribution to the process. List of steps: Interpretation - Looking at USGS Geology and SCS soils maps, they were interpreted for H-M-L as regards recharge. Interpretation - Well log data was plotted based on lat-long coords. Depth to groundwater was determined for each well. Polygons were then drawn for H-M-L D. to groundwater AUTOMATION: (King Co. Staff work only) 3 layers (GEO., soils,depth to GW) were over lanin. A matrix was used to determine resultant recharge in each resulting polygon. QUALITY ASSURANCE: March 2008, digitizing irregularities and null values have been noted by DNRP/WLRD/STS/WQQ - Hydrologic Services Group and KC GIS data steward. These irregularities will be addressed in future updates to ASGWC. The total area increased because the RBC has a greater mapped area than the previous ASGWC map extent. The ASGWC data history: This data set represents the joining of 9 separate analyses for 9 different study areas. In most cases, surficial geology, soils and depth to groundwater were combined in a matrix to determine final susceptibility. SOURCES: Vashon - Maury Island : used new geology from U. of Wa. for PType, (WHPA's, DTW, to update ASGWC susceptibility data July 2007. New susceptibility data from U. of Wa. added for parts of Issaquah and Redmond/Bear Creek data updated Feb. 2008. Schema changes Feb. 2008, added "D_GW"; "RECHARGE" name changed to " SUSCEPT"; "RCH_SUM" changed to "SUSCP_SUM". REDMOND/BEAR CREEK GWMA - EMCON NW Date: 01/01/1992 Scale: Unknown VASHON GWMA - GERACHTY AND MILLER Date: 01/01/1993 Scale: Unknown Date: 01/01/1993 Scale: Unknown SOUTH KING GWMA - ECOMOMIC AND ENGINEERING SERVICES, INC. Date: 01/01/1991 Scale: Unknown EAST KING GWMA - US GEO. SURVEY, TACOMA Date: 01/01/1993 Scale: Unknown LOWER CEDAR S.A. - EMCON NW Date: 01/01/1993 Scale: Unknown ENUMCLAW, HWOLLYWOOD HILLS, AND S. BELLEVUE - KC STAFF(DDES) Date: 01/01/1994 Scale: Unknown MANUSCRIPTION: For all consultant work: please consult the studies. King County Staff interpreted geology, soils, and well log maps for their contribution to the process. List of steps: Interpretation - Looking at USGS Geology and SCS soils maps, they were interpreted for H-M-L as regards recharge. Interpretation - Well log data was plotted based on lat-long coords. Depth to groundwater was determined for each well. Polygons were then drawn for H-M-L D. to groundwater AUTOMATION: (King Co. Staff work only) 3 layers (GEO., soils,depth to GW) were over lanin. A matrix was used to determine resultant recharge in each resulting polygon. QUALITY ASSURANCE: March 2008, digitizing irregularities and null values have been noted by DNRP/WLRD/STS/WQQ - Hydrologic Services Group and KC GIS data steward. These irregularities will be addressed in future updates to ASGWC. The total area increased because the RBC has a greater mapped area than the previous ASGWC map extent.
  1. How should this data set be cited?

    County, King, 20050323, Areas Susceptible to Groundwater Contamination: King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.541801
    East_Bounding_Coordinate: -121.695106
    North_Bounding_Coordinate: 47.780938
    South_Bounding_Coordinate: 47.147729

  3. What does it look like?

    <http://www5.kingcounty.gov/sdc/DataImages/asgwc.jpg> (JPG)
    JPG File

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 21-Feb-2008
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • GT-polygon composed of chains (0)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet.

      Projection parameters:
      Standard_Parallel: 47.5
      Standard_Parallel: 48.73333333333333
      Longitude_of_Central_Meridian: -120.8333333333333
      Latitude_of_Projection_Origin: 47.0
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.00025
      Ordinates (y-coordinates) are specified to the nearest 0.00025
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    PLIBRARY.ENVIRO.xxxx880288
    Polygon attribute table (Source: ESRI)

    Shape
    Feature Geometry (Source: ESRI)

    Coordinates defining the features

    OBJECTID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    GEOL_TYPE
    Geology type (Source: King County)

    ValueDefinition
    QwWetland Deposits, peat and alluvium, poorly drained and intermittently we annually Grades into unit Qyal
    QvtTill-Compact diamict containing subrounded to well-rounded clasts, glacially transported and deposited. Includes minor stratified fluvial deposits. Generally forms an undulating surface a few meters to a few tens of meters thick. In ice-marginal areas and where covered by thin layer of recessional outwash, contact with recessional-outwash or ice-contact deposits (Qvr or Qvi) is gradational.
    QvrlSilt-dominated lowland lacustrine depositis
    QvrRecessional outwash deposits. Stratified sand and gravel, moderately to well sorted, and well-bedded silty sand to silty clay deposited in proglacial and ice-marginal environments.
    Qvlc 
    QviIce-contact deposits
    QvaAdvance outwash deposits
    Qpogf 
    Qpog 
    Qpofcoarse-grained deposits -Sedimentary deposits of pre-Olympia interglaciation age (Pleistocene)
    Qpft 
    Qpdc 
    Qos 
    Qoal 
    QfAlluvial fan depositis (Holocene)
    QbBeach deposits (Holocene)-Loose sand deposited by wave action
    Qal 
    af 

    POT_G
    1 character code for the susceptibility as defined by geology type (High, Medium & Low) (Source: King County)

    ValueDefinition
    HHigh as defined by geology type
    MMedium as defined by geology type
    LLow as defined by geology type

    POT_G_CD
    number code for the POT_G code (High = 2.0, Medium = 1.00, Low = 0.00) (Source: King County)

    ValueDefinition
    2.00High = 2.00
    1.00Medium = 1.00
    0.00Low = 0.00

    GW_DEPTH
    Depth of Groundwater (in feet) (Source: King County)

    ValueDefinition
    HHigh is <25'
    MMedium is in between High and Low
    LLow is >75'

    POT_D
    1 character code for the susceptiblity as defined by depth to groundwater (High, Medium & Low) (Source: King County)

    ValueDefinition
    HHigh = 2.00
    MMedium = 1.00
    LLow = 0.00

    Shape.area

    POT_D_CD
    Number code for the POT_D code (Hight = 2.00, Medium = 1.00 or Low = 0.00) (Source: King County)

    ValueDefinition
    2.00High = 2.00
    1.00Medium = 1.00
    0.00Low = 0.00

    POT_S
    1 character code for the susceptiblilty as defined by soil type (High, Medium or Low). (Source: King County)

    ValueDefinition
    HHigh = 2.00
    MMedium = 1.00
    LLow = 0.00

    POT_S_CD
    Number code for the POT_S code (Hight = 2.00, Medium = 1.00 or Low = 0.00) (Source: King County)

    ValueDefinition
    2.00High = 2.00
    1.00Medium = 1.00
    0.00Low = 0.00

    Shape.len

    D_GW
    Range of Ground Water depth. (Source: King County)

    SUSCP_SUM
    The total of adding of the three susceptibility categories as follow: POT_G + POT_D + (0.25 * POT_S). The possible range of values for this field is 0.00 to 4.50. (Source: King County)

    SUSCEPT
    1 character code for the total susceptibility as defined by SUSCP_SUM (High, Medium or Low) (Source: King County)

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    King County

  3. To whom should users address questions about the data?

    King County Dept. of Natural Resources and Parks, Water and Lands Resources Division
    Attn: Ken Rauscher
    Senior GIS Analyst
    201 South Jackson Street, Suite 706
    Seattle, WA 98104
    US

    206-296-1922 (voice)

Why was the data set created?

This dataset was created to fulfill a requirement of the Growth Management Act: analysze and protect remaining areas of high aquifer susceptibility ot groundwater contamination.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    Type_of_Source_Media: None
    Source_Contribution:
    ASGWC created from ASGWC95 by adding the new Vashon data received from UW. ASGWC is a scientific data set as opposed to CARA which is a political/policy response to the scientific dataset of ASGWC95 (and other datasets as well). So they both will be kept.

  2. How were the data generated, processed, and modified?

    (process 1 of 1)
    ASGWC Created from ASGWC95 by adding the new Vashon data received from UW. ASGWC is a scientific data set as opposed to CARA which is a political/policy response to the scientific dataset of ASGWC95 (and other datasets as well). So they both will be kept.

    Person who carried out this activity:

    King County
    Attn: constance carlson
    GIS Analyst

    206 296-4425 (voice)

  3. What similar or related data should the user be aware of?

    , Areas Susceptible to Groundwater Contamination.

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

  5. How consistent are the relationships among the observations, including topology?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.

  1. Who distributes the data set? (Distributor 1 of 1)

    KCGIS Center
    Attn: Cheryl Wilder
    Data Sales Coordinator
    201 S Jackson St, Suite 700
    Seattle, WA 98104
    US

    206-263-5220 (voice)

  2. What's the catalog number I need to order this data set?

    /plibrary2/enviro/shapes/polygon/asgwc.shp

  3. What legal disclaimers am I supposed to read?

    King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-Dec-2014
Metadata author:
King County Dept. of Natural Resources & Parks
Attn: Ken Rauscher
Senior GIS Analyst
201 South Jackson Street, Suite 706
Seattle, WA 98104
US

206-296-1922 (voice)
firstname.lastname@kingcounty.gov

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Sat Apr 06 03:00:03 2019