| 1Identifier assigned to well in Tucson Airport Remediation Project area.                                                                             |                                                                                                                                                                                                                                                           |  |
|------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--|
| 2Agency identifier assigned to well.                                                                                                                 |                                                                                                                                                                                                                                                           |  |
| 3Agency reporting well identification number.  USGS, U.S. Geological Survey assigns a USGS Site No., a unique 15-digit site-identification           |                                                                                                                                                                                                                                                           |  |
| number permanently designated by the USGS and recorded in National Water Information System, a national computer database maintained by              |                                                                                                                                                                                                                                                           |  |
| USGS at http://nwis.waterdata.usgs.gov/nwis/gw.  ADWR, Arizona Department of Water Resources assignes a Wells 55 Registration Number that            |                                                                                                                                                                                                                                                           |  |
| begins with "55-" (for example, 55-569349) or a 15-digit Groundwater Site Inventory Site Identification Number (for example,                         |                                                                                                                                                                                                                                                           |  |
| 320815110585201); well data may be available at https://gisweb.azwater.gov/waterresourcedata/.                                                       |                                                                                                                                                                                                                                                           |  |
| 4Former Supply, large-diameter well formerly used in the City of Tucson municipal supply system; Monitoring, small-diameter well used for water      |                                                                                                                                                                                                                                                           |  |
| quality sampling; Private, private well used for drinking water or irrigation purposes; Supply, large capacity well used in City of Tucson municipal |                                                                                                                                                                                                                                                           |  |
| supply system.                                                                                                                                       |                                                                                                                                                                                                                                                           |  |
| 5ADEQ, Arizona Department of Environmental Quality; ADWR, Arizona Department of Water Resources; PDEQ, Pima County Department of                     |                                                                                                                                                                                                                                                           |  |
| Environmental Quality (Pima County Department of Environmental Quality, 2009); Tucson Water, City of Tucson Water Department; USGS,                  |                                                                                                                                                                                                                                                           |  |
| U.S. Geological Survey information from National Water Information System database (http://nwis.waterdata.usgs.gov/nwis/gw).                         |                                                                                                                                                                                                                                                           |  |
| 6Data reported as nondetect are plotted at one-half the reporting limit.                                                                             |                                                                                                                                                                                                                                                           |  |
| 7ADEQ, Arizona Department of Environmental Quality; PDEQ, Pima County Department of Environmental Quality; TIAA, Tucson International                |                                                                                                                                                                                                                                                           |  |
| Airport Authority; Tucson Water, City of Tucson Water Department; USGS, U.S. Geological Survey Arizona Water Science Center.                         |                                                                                                                                                                                                                                                           |  |
| 8Published source for 1,4-dioxane data:                                                                                                              |                                                                                                                                                                                                                                                           |  |
|                                                                                                                                                      | Conestoga-Rovers & Associates, 2007, Groundwater monitoring results for 1,4-dioxane sampling, TIAA Superfund Site—Airport Property,    Tucson, Arizona: Conestoga-Rovers & Associates, Reference No. 013711-89, 130 p.                            |  |
|                                                                                                                                                      | Conestoga-Rovers & Associates, 2009, Groundwater monitoring results for 1,4-dioxane sampling, TIAA Superfund Site— Airport Property,    Tucson, Arizona: Conestoga-Rovers & Associates, Reference No. 013711-281, 12 p.                           |  |
|                                                                                                                                                      | Malcolm Pirnie, Inc., 2007, Tucson International Airport area Groundwater Remediation Project, semi-annual status report, September 2006    through February 2007: Malcolm Pirnie, Inc., no. 1830-086, 193 p.                                             |  |
|                                                                                                                                                      | Malcolm Pirnie, Inc., 2009, Tucson International Airport area Groundwater Remediation Project,  semi-annual status report, March 2009    through August 2009: Malcolm Pirnie, Inc., no. 1830-086, 202 p.                                                  |  |
|                                                                                                                                                      | Pima County Department of Environmental Quality, 2009, South-side private well monitoring program, Tucson International Airport area    superfund site, Tucson, Arizon: Pima County Department of Environmental Quality, Annual Report, April 2009, 52 p. |  |
|                                                                                                                                                      | Tillman, F.D, 2009, Results of the analyses for 1,4-dioxane of groundwater samples collected in the Tucson Airport Remediation Project    area: U.S. Geological Survey Open-File Report 2009-1196, 14 p.                                                  |  |
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