## Prepared for United States Environmental Protection Agency Region 6

EXPLANATION OF SIGNIFICANT DIFFERENCES
for
RUSTON FOUNDRY SUPERFUND SITE EPA ID No. LAD985185107
GS09K99BHD0010 Task Order No. T0703BG1026

Katrina Coltrain Remedial Project Manager U.S. EPA Region 6

Prepared by
Science Applications International Corporation 555 Republic Drive, Suite 300 Plano, TX 75074

January 7, 2008

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## PREAMBLE The purpose of this document is to provide the public with an index to the Administrative Record File (AR File) for the U.S. Environmental Protection Agency’s (EPA) selected remedial action to respond to conditions at the Ruston Foundry Superfund Site (the “S ite”). EPA’s action is authorized by the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), 42 U.S.C. Section 9601 et seq

. Section 113 (j)(1) of CERCLA, 42 U.S.C. Sec tion 9613 (j)(1), provides that judicial review of the adequacy of a CERCLA response action shall be limited to the Administrative Record (AR). Section 113 (k)(1) of CERCLA, 42 U.S.C. Section 9613 (k)(1), requires the EPA to establish an AR upon which it shall base the selection of its remedialactions. As the EPA decides what to do at the site of a release of hazardous substances, it comp iles documents concerning the site and it’s decision into an “AR File.” This means that documents may be added to the AR File from time to time. After the EPA Regional Administrator or the Administrator’s delegate signs the Action Memorandum or the Record of Decision memorializing the selection of the action, the documents which form the basis for the selection of the re sponse action are then known as the Administrative Record “AR.” Section 113(k)(1) of CERCLA requires the EPA to make the AR File available to the public at or near the site of the re sponse action. Accordingly, the EPA has established a repository where the AR File may be reviewed near the Site at: Rapides Public Library 411 Washington Street Alexandria, Louisiana 71301 Contact: Steve Rogge Telephone: (318) 442-1840 ext 238


## and Louisiana Department of Environmental Quality Public Records Center, Galvez Building, Rm 127 602 N. Fifth Street Baton Rouge, Louisiana 70802 Telephone: (225) 219-3168 Fax: (225) 219-3175 E-mail: publicrecords@la.gov or visit http://www.deq.state.la.us/pubrecords


## The public also may review the AR File at the EPA Region 6 office in Dallas, Texas, by contacting the Remedial Project Manager at the address listed below. The AR File is available for public review during normal business hours. The AR File is treated as a non-circulating reference document. Any document in the AR File may be photocopied according to the procedures used at the repository or at the EPA Region 6 office. This index and the AR File were compiled in accordance with the EPA’s Final Guidance on Administrative Records for Selecting CERCLA Response Actions, Office of Solid Waste and Emergency Response (OSWER) Directive Number

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## 9833.3A1 (December 3, 1990). Documents listed as bibliographic sources for other documents in the AR File might not be listed separately in the index. Where a document is listed in the index but not located among the documents which the EPA has made available inthe repository, the EPA may, upon request, include the document in the repository or make the documen t available for review at an alternate location. This applies to documents such as verified sampling data, chain of custody forms, guidance and policy documents, as well as voluminous site-specific reports. It does not apply to documents in EPA’s confidential file. (Copies of guidance documents also can be obtained by calling the RCRA/Superfund/Title 3 Hotline at (800) 424-9346.) These requests should be addressed to:
Katrina Coltrain Remedial Project Manager U.S. EPA Region 6 1445 Ross Avenue Dallas, Texas 75202-2733 (214) 665-8143 The EPA response selection guidance compe ndium index has not been updated since March 22, 1991 (see CERCLA Administrative Record s: First Update of the Compendium of Documents Used for Selecting CERCLA Response Actions [March 22, 1991]); accordingly, it is not included here. Moreover, based on resource considerations, the Region 6 Superfund Division Director has decided not to maintain a Region 6 compendium of response selection guidance. Instead, consistent with 40 CFR Section 300.805(a)(2) and 300.810(a)(2) and OSWER Directive No. 9833.3A-1 (page 37), the AR File Index includes lis tings of all guidance documents which may form a basis for the selection of the response action in question. The documents included in the AR File index are arranged predominantly in chronological order. The AR File index helps locate and retrie ve documents in the file. It also provides an overview of the response action history. The i ndex includes the following information for each document:
• Doc ID - The document identifier number. • Date - The date the document was published and/or released. “01/01/2525" means no date was recorded. • Pages - Total number of printed pages in the document, including attachments. • Title - Descriptive heading of the document. • Document Type - General identification, (e.g. correspondence, Remedial Investigation Report, Record of Decision.) • Author - Name of originator, and the name of the organization that the author is affiliated with. If either the originator name or the organization name is not identified, then the field is captured with the letters “N/A”. • Addressee - Name and affiliation of the addressee. If either the originator name or the organization name is not identified, then the field is captured with the letters “N/A”.

# EXPLANATION OF SIGNIFICANT DIFFERENCES (ESD) INDEX 01/08/2008
Site Name: CERCLIS: OUID: SSID: Action: RUSTON FOUNDRY LAD985185107 NONE 1F ESD 

## 06 Region Id:

176258 Docid: 000001 Bates: 000011 To: 10/12/2004 Date: 11 Pages: FINAL ESD ADMINISTRATIVE RECORD INDEX

Title: Doc Type: INDEX Name Organization Author: NONE, SCIENCE APPLICATIONS INTERNATIONAL CORPORATION Name Organization Addressee: COLTRAIN, KATRINA U.S. ENVIRONMENTAL PROTECTION AGENCY 06 Region Id:

824246 Docid: 000012 Bates: 000015 To: 09/13/2007 Date: 4 Pages: [EXPLANATION OF SIGNIFICANT DIFFERENCES TREATABILITY STUDY FOR RUSTON FOUNDRY] Title: Doc Type: CORRESPONDENCE ELECTRONIC RECORD Name Organization Author: CULLEY, CHESTER A KANSAS CITY SOUTHERN RAILWAY COMPANY Name Organization Addressee: COLTRAIN, KATRINA U.S. ENVIRONMENTAL PROTECTION AGENCY 06 Region Id:

824577 Docid: 000016 Bates: 000036 To: 01/02/2008 Date: 21 Pages: EXPLANATION OF SIGNIFICANT DIFFERENCES CONTINGENCY REMEDY FOR RUSTON FOUNDRY SUPERFUND SITE Title: Doc Type: REPORT / STUDY ELECTRONIC RECORD Name Organization Author: NONE, U.S. ENVIRONMENTAL PROTECTION AGENCY Name Organization Addressee: NONE, NONE 06 Region Id:



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# EXPLANATION OF SIGNIFICANT DIFFERENCES (ESD) INDEX 01/08/2008
Site Name: CERCLIS: OUID: SSID: Action: RUSTON FOUNDRY LAD985185107 NONE 1F ESD 

## 06 Region Id:

824578 Docid: 000037 Bates: 000037 To: 01/03/2008 Date: 1 Pages: [RUSTON FOUNDRY SUPERFUND SITE PUBLIC NOTICE U.S. EPA ISSUES AN EXPLANATION OF SIGNIFICANT DIFFERENCES] Title: Doc Type: NOTICE ELECTRONIC RECORD Name Organization Author: NONE, U.S. ENVIRONMENTAL PROTECTION AGENCY Name Organization Addressee: NONE, NONE 06 Region Id:

824579 Docid: 000038 Bates: 000038 To: 01/04/2008 Date: 1 Pages: [LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY HAS NO COMMENTS ON THE DRAFTS AND FINAL VERSION OF THE EXPLANATION OF SIGNIFICANT DIFFERENCES FOR THE RUSTON FOUNDRY SITE] Title:

Doc Type: CORRESPONDENCE ELECTRONIC RECORD Name Organization Author: CASANOVA, KEITH L LOUISIANA DEPARTMENT OF ENVIRONMENTAL QUALITY Name Organization Addressee: HEPOLA, JOHN R U.S. ENVIRONMENTAL PROTECTION AGENCY 06 Region Id:



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