GIS Data Catalog

Areas Susceptible to Groundwater Contamination

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Summary

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.

Description

Areas susceptible to groundwater contamination

Layer information

Layer Name	asgwc_area
Subject Category	Environment
Title	Areas Susceptible to Groundwater Contamination
Feature Count	6005
Feature Type	Polygon
Next Update	As needed
Spatial reference	EPSG:2926
Control ID	202
Place Keywords	Pacific NW, Washington State, King County, WA
Theme Keywords	Groundwater, Natural Resources, Enviro
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.

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Attribute information

Shape From ESRI	Description Feature Geometry Domain Coordinates defining the features
OBJECTID From ESRI	Description Internal feature number. Domain Sequential unique whole numbers that are automatically generated.
GEOL_TYPE From King County	Description Geology type Domain Qw - Wetland Deposits, peat and alluvium, poorly drained and intermittently we annually Grades into unit Qyal Qvt - Till-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. Qvrl - Silt-dominated lowland lacustrine depositis Qvr - Recessional 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 Qvi - Ice-contact deposits Qva - Advance outwash deposits Qpogf Qpog Qpof - coarse-grained deposits -Sedimentary deposits of pre-Olympia interglaciation age (Pleistocene) Qpft Qpdc Qos Qoal Qf - Alluvial fan depositis (Holocene) Qb - Beach deposits (Holocene)-Loose sand deposited by wave action Qal af
POT_G From King County	Description 1 character code for the susceptibility as defined by geology type (High, Medium & Low) Domain H - High as defined by geology type M - Medium as defined by geology type L - Low as defined by geology type
POT_G_CD From King County	Description number code for the POT_G code (High = 2.0, Medium = 1.00, Low = 0.00) Domain 2.00 - High = 2.00 1.00 - Medium = 1.00 0.00 - Low = 0.00
GW_DEPTH From King County	Description Depth of Groundwater (in feet) Domain H - High is <25' M - Medium is in between High and Low L - Low is >75'
POT_D From King County	Description 1 character code for the susceptiblity as defined by depth to groundwater (High, Medium & Low) Domain H - High = 2.00 M - Medium = 1.00 L - Low = 0.00
POT_D_CD From King County	Description Number code for the POT_D code (Hight = 2.00, Medium = 1.00 or Low = 0.00) Domain 2.00 - High = 2.00 1.00 - Medium = 1.00 0.00 - Low = 0.00
POT_S From King County	Description 1 character code for the susceptiblilty as defined by soil type (High, Medium or Low). Domain H - High = 2.00 M - Medium = 1.00 L - Low = 0.00
POT_S_CD From King County	Description Number code for the POT_S code (Hight = 2.00, Medium = 1.00 or Low = 0.00) Domain 2.00 - High = 2.00 1.00 - Medium = 1.00 0.00 - Low = 0.00
D_GW From King County	Description Range of Ground Water depth. Domain Not Found
SUSCP_SUM From King County	Description 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. Domain Not Found
SUSCEPT From King County	Description 1 character code for the total susceptibility as defined by SUSCP_SUM (High, Medium or Low) Domain Not Found
Shape.STArea() From SQL Server	Description Returns the area of a geometry instance in square units, based on the spatial reference identifier (SRID) of the geometry. Domain Double
Shape.STLength() From SQL Server	Description Returns the total length of the elements in a geometry instance. Domain Double

Contact information

Maintained by	DNRP - Water and Land Resources
Primary	Harkeerat Kang Harkeerat.Kang@kingcounty.gov

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