Description: Critical aquifer recharge areas are those areas that provide a critical recharging effect on aquifers used for drinking water, including areas that are vulnerable to contamination or reduced recharge.CARAs are divided into three categories depending on sensitivity: Category I - extreme aquifer sensitivity; Category II - high aquifer sensitivity; Category III - moderate aquifer sensitivity. See Thurston County Code Chapter 24.10.010 for full definitions.This data set combines soil-based CARAs with geology-based CARAs. Geology-based CARA categories were developed in conjunction with Nadine Romero, Thurston County's hydrogeologist, using available data from the Washington State Department of Natural Reources. Where an area has conflicting CARA categories between soils and geology, the more restrictive category prevails.Geology mapping at the 1:24,000 scale was only available for some portions of the county at the time of CAO update, the rest is mapped at 1:100,000 scale. Therefore it is important to not to accidentally use the data at a scale beyond its native resolution. The geology data are organized by quads. The 24k quads are: Shelton, Squaxin Island, Longbranch, Summit Lake, Tumwater, Lacey, Nisqually, Maytown, and East Olympia. The 100k quads are: Kamilche Valley, Capitol Peak, Little Rock, Tenalquot Prairie, McKenna, Harts Lake, Oakville, Rochester, Violet Prairie, Bucoda, Vail, Lake Lawrence, Bald Hills, Eatonville, and Elbe.
Name: Critical Aquifer Recharge Areas (Agricultural)
Display Field: SCS_NAME
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: Using soil classification data from the USDA, the location of critical aquifer recharge areas were determined. Only soils with cara categories of 1-3 were selected.
Service Item Id: bef636be666140a0ad6dc38101bb6a60
Copyright Text: modification date: 1/17/2013 by Clarkj
Description: DOH_Wellhead field Polygons depict the 6 month, 1 year, 5 year, and 10 yeartime of travel distances for public drinking water supplies for Group A and B public water systems. Source location data was obtained from the Washington State Department of Health, Office of Drinking Water.TC_Wellhead field Polygons depict The Grand Mound wellhead proteciton areas which were developed by the County Hydrogeologist Nadine Romero in 2012/2013 using a series of models developed for Thurston County Public Works in Visual ModFLow Nuermical Models. This data was then digitized using ArcGIS software and verified by Ms. Romero. The time-of-travel zones depicted include 1 year, 2 year and 3 year areas. Combo_Wellhead field Polygons depict wellhead protection areas used to identify parcels for permitting and environmental health in the Combo table extract process for Amanda and the Parcel Information Page.SrcStatusInd field denotes active wellheads and should be used for mapping and analysis.This layer has been updated to include schema from the WA DOH.Update by kah in Src 12/02/14
Service Item Id: bef636be666140a0ad6dc38101bb6a60
Copyright Text: Washington Department of Health, Office of Drinking Water
Washington Department of Transportation
Thurston County Environmental Health
Thurston County Public Works
Thursotn County Resource Stewardship