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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

AbbreviationMeaning
appappendix
attchsattachments
enclsenclosures
EPAEnvironmental Protection Agency
LtrLetter
rptreport
SDGSample delivery group
TCETrichloroethylene
TLTransmittal letter
VLEACHModel for assessing effects on groundwater from volatile contaminants leaching through vadose zone
VOCVolatile organic compound
w/with

Administrative Record Index

Doc DateAuthor / Author AffiliateAddressee / Addressee AffiliateSubjectAR #Doc ID
1998/10/19Dennis Tucker / Malcolm Pirnie, IncEmily Roth / Environmental Protection Agency - Region 9Ltr: Requests authorization to cease operation of on-site soil vapor extraciton (SVE) system00010217-90416
1999/06/30Kristina Kommalan / AZ Dept of Environmental QualityEmily Roth / Environmental Protection Agency - Region 9Ltr: Recommends soil vapor extraction (SVE) system resume operation due to continuing presence of TCE, w/encls00020217-00429
2000/02/07Malcolm Pirnie, Inc-Soil vapor extraction (SVE) system VLEACH modeling evaluation, north site, w/TL00030217-00397
2000/03/16C H 2 M Hill-EPA presentation to City of Goodyear 3/16/2000 re site remedy options00040217-00387
2000/04/13Stephen Cleveland / City of Goodyear, AZEmily Roth / Environmental Protection Agency - Region 9Ltr: Follow-up to 3/16/2000 meeting re dioxins & thermal oxidizer00050217-91552
2001/09/20Andria Benner / Environmental Protection Agency - Region 9Stephen Cleveland / City of Goodyear, AZLtr: Restart of soil vapor extraction (SVE) system with carbon treatment unit, w/attchs00060217-91553
2001/09/25Grant Anderson / City of Goodyear, AZ - Public Works DeptAndria Benner / Environmental Protection Agency - Region 9Ltr: Endorses restart of soil vapor extraction (SVE) system with carbon treatment unit00070217-91554
2002/06/09Environmental Protection Agency - Region 9-Data Validation Rpt: R02S50, SDG 02171B, 34 soil gas samples, received 6/19/02 for VOCs, w/TLs00080217-00964
2002/07/18Environmental 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/TLs00090217-00963
2002/08/00US Army Corps of Engineers-Technical evaluation of off-gas treatment for re-starting soil vapor extraction (SVE) system00100217-00960
2002/09/00C H 2 M HillEnvironmental Protection Agency - Region 9Summary & analysis of historical soil gas data & soil vapor extraction (SVE) system operations data from Unidynamics facility00110217-00959
2002/09/00C H 2 M HillEnvironmental Protection Agency - Region 9Conceptual (30%) design rpt for granulated activated carbon treatment unit for soil vapor extraction (SVE) system at Unidynamics facility, w/app00120217-00961
2002/09/13Philip McNeely / AZ Dept of Environmental Quality - Superfund Programs SectionDeborah Jordan / Environmental Protection Agency - Region 9Ltr: Concurs with explanation of significant differences (ESD) #500130217-91556
2002/09/19Environmental Protection Agency - Region 9-Explanation of significant differences (ESD) #500140217-00962
2002/09/23Environmental Protection Agency - Region 9-Public Notice: EPA announces changes to cleanup plan for northern area of site (English & Spanish)00150217-91557

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