Pacific Southwest, Region 9: Superfund
Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations
Phoenix-Goodyear Airport Area
Superfund Site
Explanation of Significant Differences #5
Administrative Record Index
To request copies of administrative record documents, an electronic order form is available.
The Phoenix-Goodyear Airport Area Superfund Site administrative record contains documents arranged in chronological order from September 1983 to September 2002. The original administrative record file was compiled prior to the September 1989 Record of Decision (ROD) and consists of documents AR#1 - AR #44.
Phoenix-Goodyear Airport Area Superfund Site is located in Goodyear, Arizona and is divided into two components. The northern portion of the site consists of Unidynamics-Phoenix, Incorporated property and groundwater contamination emanating from the property. The southern portion of the site consists of the Loral Defense Systems and the Phoenix-Goodyear Airport property, as well as groundwater contamination emanating from these areas (see attached map).
On September 26, 1989, the United States Environmental Protection Agency (EPA) signed a ROD for the final remedy at the Site. The ROD is an EPA document which defines the remedy necessary to protect human health and the environment. The State of Arizona concurred with the remedy selected in the 1989 ROD. In January 1991, EPA issued an Explanation of Significant Differences (ESD) #1 to explain five significant, but not fundamental, differences between the final remedy selected in the 1989 ROD and the final remedy as it would be implemented at the Site. In May 1993, April 1996, and March 1998, EPA issued ESDs #2, #3 and #4 respectively, which described several other changes to the remedy selected in the ROD.
ESD #5 (AR #14) reverses certain of the changes described in ESD #3. Specifically, ESD #3, in part, changed the air emissions treatment for the soil gas remedy at the northern portion of the Site to thermal oxidation. ESD #5, in turn, returns the air emissions treatment system to a carbon system as originally selected in the 1989 ROD.
The list of U.S. Environmental Protection Agency guidance documents which were considered or relied upon in the selection of the remedy is document AR #12 in the administrative record index of ESD #3. Copies of the guidance documents are contained in the Compendium of CERCLA Response Selection Guidance Documents located in the Region 9 Superfund Records Center in San Francisco.
September 24, 2002
List of Abbreviations and Acronyms Used in Administrative Record Index
| Abbreviation | Meaning |
| app | appendix |
| attchs | attachments |
| encls | enclosures |
| EPA | Environmental Protection Agency |
| Ltr | Letter |
| rpt | report |
| SDG | Sample delivery group |
| TCE | Trichloroethylene |
| TL | Transmittal letter |
| VLEACH | Model for assessing effects on groundwater from volatile contaminants leaching through vadose zone |
| VOC | Volatile organic compound |
| w/ | with |
Administrative Record Index
| Doc Date | Author / Author Affiliate | Addressee / Addressee Affiliate | Subject | AR # | Doc ID |
| 1998/10/19 | Dennis Tucker / Malcolm Pirnie, Inc | Emily Roth / Environmental Protection Agency - Region 9 | Ltr: Requests authorization to cease operation of on-site soil vapor extraciton (SVE) system | 0001 | 0217-90416 |
| 1999/06/30 | Kristina Kommalan / AZ Dept of Environmental Quality | Emily Roth / Environmental Protection Agency - Region 9 | Ltr: Recommends soil vapor extraction (SVE) system resume operation due to continuing presence of TCE, w/encls | 0002 | 0217-00429 |
| 2000/02/07 | Malcolm Pirnie, Inc | - | Soil vapor extraction (SVE) system VLEACH modeling evaluation, north site, w/TL | 0003 | 0217-00397 |
| 2000/03/16 | C H 2 M Hill | - | EPA presentation to City of Goodyear 3/16/2000 re site remedy options | 0004 | 0217-00387 |
| 2000/04/13 | Stephen Cleveland / City of Goodyear, AZ | Emily Roth / Environmental Protection Agency - Region 9 | Ltr: Follow-up to 3/16/2000 meeting re dioxins & thermal oxidizer | 0005 | 0217-91552 |
| 2001/09/20 | Andria Benner / Environmental Protection Agency - Region 9 | Stephen Cleveland / City of Goodyear, AZ | Ltr: Restart of soil vapor extraction (SVE) system with carbon treatment unit, w/attchs | 0006 | 0217-91553 |
| 2001/09/25 | Grant Anderson / City of Goodyear, AZ - Public Works Dept | Andria Benner / Environmental Protection Agency - Region 9 | Ltr: Endorses restart of soil vapor extraction (SVE) system with carbon treatment unit | 0007 | 0217-91554 |
| 2002/06/09 | Environmental Protection Agency - Region 9 | - | Data Validation Rpt: R02S50, SDG 02171B, 34 soil gas samples, received 6/19/02 for VOCs, w/TLs | 0008 | 0217-00964 |
| 2002/07/18 | Environmental Protection Agency - Region 9 | - | Data Validation Rpt: R02S50, SDG 02171B, 34 soil gas samples, received 6/19/02 for VOCs & TO-15 subset analyses, w/TLs | 0009 | 0217-00963 |
| 2002/08/00 | US Army Corps of Engineers | - | Technical evaluation of off-gas treatment for re-starting soil vapor extraction (SVE) system | 0010 | 0217-00960 |
| 2002/09/00 | C H 2 M Hill | Environmental Protection Agency - Region 9 | Summary & analysis of historical soil gas data & soil vapor extraction (SVE) system operations data from Unidynamics facility | 0011 | 0217-00959 |
| 2002/09/00 | C H 2 M Hill | Environmental Protection Agency - Region 9 | Conceptual (30%) design rpt for granulated activated carbon treatment unit for soil vapor extraction (SVE) system at Unidynamics facility, w/app | 0012 | 0217-00961 |
| 2002/09/13 | Philip McNeely / AZ Dept of Environmental Quality - Superfund Programs Section | Deborah Jordan / Environmental Protection Agency - Region 9 | Ltr: Concurs with explanation of significant differences (ESD) #5 | 0013 | 0217-91556 |
| 2002/09/19 | Environmental Protection Agency - Region 9 | - | Explanation of significant differences (ESD) #5 | 0014 | 0217-00962 |
| 2002/09/23 | Environmental Protection Agency - Region 9 | - | Public Notice: EPA announces changes to cleanup plan for northern area of site (English & Spanish) | 0015 | 0217-91557 |