In this action, the Missouri Coalition for the Environment Foundation (the “Coalition”) seeks disclosure of a number of documents from the United States Army Corps of Engineers (the “Corps”) pursuant to the Freedom of Information Act (“FOIA”), 5 U.S.C. § 552. The district court granted summary judgment in favor of the Corps on the basis that the deliberative process privilege, 5 U.S.C. § 552(b)(5), exempts аll 83 documents responsive to the request. The Coalition appeals from the judgment and we remand for further proceedings.
I.
The Corps conducted a study of flood risk and recurrence on the Mississippi, Missouri, and Illinois Rivers known as the Upper Mississippi River System Flow Frequency Study (“UMRSFFS”). This study’s purpose was to identify the 100- and 500-year flood plains. Thе UMRSFFS commenced in 1997 and its results were released in 2004.
In conducting the UMRSFFS, the Corps instituted a task force to oversee and review the study. The task force was divided into two groups — the Technical Advisory Group (“TAG”) and the Inter-Agency Advisory Group (“IAG”). The TAG was comprised of subject matter experts from each of the seven states relevant to the study. The IAG similarly included subject matter experts from each of the seven relevant states but also incorporated experts from other federal agencies, including the Federal Emergency Management Agency, the Bureau of Reclamation, the Tennessee Valley Authority, the National Resource Conservation Service, the United States Geological Survey, and the National Weather Service. On behalf of the Corps, Dr. David Goldman coordinated the IAG and TAG consultants. During the course of the study, the TAG and IAG advised the Corps on the methodology to use for the UMRSFFS and reviewed the Corps’ preliminary results. These discussions and other communicаtion took place through meetings, written memoranda, and informally through e-mails.
*1208 On April 25, 2005, the Coalition submitted a FOIA request to the Corps. 2 The FOIA request solicited three broad categories of documents:
1. Each and every document that evidences a communication to or from a member of the Flow Frequency Study Technical Advisоry Group, regardless of the other party to the communication, relating to the Flow Frequency Study.
2. All agendas and minutes of meetings of the Flow Frequency Study Technical Advisory Group.
3. Each and every document that evidences disagreement, dispute or concern about the assumption adopted in the Flow Frequency Study that flood flows have been “independently and identically distributed” (aka the assumption of “stationarity”).
The Corps did not provide a written response to the FOIA request; however, representatives from each party communicated by phone. No documents were released pursuant to the request. Subsequently, the Coalition filed the instаnt case in district court. In its answer to the Coalition’s complaint, the Corps asserted the requested documents were subject to a FOIA exemption.
The Corps moved for summary judgment and attached to its motion declarations from Corps employees Thomas Mi-near and Dr. David Goldman and a Vaughn index identifying 83 documents responsive tо the Coalition’s FOIA request. The Vaughn index identified each document with general distinguishing information such as the date it was generated, the author, the addressees, and whether the document was a memorandum, email, letter, agenda, or meeting notes. A short description was provided for each document (e.g., “E-mail discussing potential methodologies to be used in FFS” or “Letter discussing the FFS analysis methods”). Finally, each and every document was identified as privileged under FOIA Exemption 5, the Deliberative Process Privilege. The Coalition cross-moved for summary judgment, arguing the Corps had failed to prove that the documents were exempt from disclosure. Summary judgment was granted in favor of the Corps.
II.
The Freedom of Information Act is intended “to provide wide-ranging public access to government documents.”
Miller v. U.S. Dep’t of Agric.,
The Act itself provides nine specific statutory exemptions. 5 U.S.C. § 552(b). These are to be narrowly construed to ensure that disclosure, rather than secrecy, remains the primary objective of the Act.
Miller v. U.S. Dep’t of Agric.,
This Court reviews a district court’s grant of summary judgment in a FOIA case
de novo. Missouri, ex rel. Garstang v. U.S. Dep’t of Interior,
The Cоalition argues that, viewed in the light most favorable to the Coalition, the Corps’ Vaughn index is insufficient to show whether the Corps’ obligations under FOIA were discharged. As a result, the Coalition posits, some of the documents should have been released. Alternatively, the Coalition proposes that even if the Vaughn index is adequate, some of the documents- — in whole or in part — are not subject to the exemption. The Corps contends that it satisfied its FOIA obligations with an adequate Vaughn index that properly demonstrated the documents were subject to the deliberative process privilege.
Vaughn Indices
To help determine whether a governmental agency has discharged its burden undеr FOIA,
Vaughn
indices may be used.
Crancer v. Dep’t of Justice,
This Court has held that a proper Vaughn index
provides a specific factual description of each document sought by the FOIA requester. Sрecifically, such an index includes a general description of each document’s contents, including information about the document’s creation, such as date, time, and place. For each document, the exemption claimed by the gov *1210 ernment is identified, and an explanation as to why the exemption applies to the document in question is provided.
Crancer,
Generally, a more substantial
Vaughn
index — one that provides for each doсument requested a specific explanation as to why an exemption applies — is preferable to a bare bones index. Even so,
in camera
review of the documentation in this case was not necessary.
Barney,
The sworn declarations from Mr. Minear and Dr. Goldman provide adequate additional information to explain why the documents should be exempt.
See Miller v. U.S. Dep’t of State,
The affidavits supplied in this case discuss the UMRSFFS process and the nature of the communications between parties. Mr. Minear’s affidavit describes the basis for the exemption:
These communications are exempt from disclosure under Exemption 5 because they are predecisional and part of the deliberative process. They involve the give-and-take that is inherent in such a study process. The documents consist of the TAG members freely critiquing thе work of the Corps and other TAG members as the TAG worked over the years to advise the Government regarding the best study process. Release of these documents could deter not only such group members from speaking freely in the future, but also deter Government agencies from empanelling such groups of experts....
(Minnear Aff. р. 3). Considering the identifying information supplied in the
Vaughn
index and the additional information provided in the affidavits, we cannot conclude that the
Vaughn
index was, on its face, inadequate under
Crancer.
*1211 Deliberative Process Privilege
Whether the Vaughn index and affidavits were themselves adequate, the Coalition argues that the Corps failed to prove it had discharged its obligations under FOIA. The Coalition argues certain categories of dоcuments, such as meeting agendas and documents discussing UMRSFFS methodology or the goals of the committees, could not reasonably be exempt under the deliberative process privilege and should have been disclosed.
The FOIA deliberative process privilege exempts from disclosure “inter-agency or intra-agency memorandums or letters which would not be available by law to a party other than an agency in litigation with the agency.” 5 U.S.C. § 552(b)(5);
Shorr,
The Coalition raises the unlikelihood that every responsive document is exempt under the deliberative prоcess privilege. Initially, this argument appears quite seductive; however, the Coalition’s FOIA request is obviously tailored to ferret out disagreement or contradiction that arose in the process of creating the UMRSFFS.
See Barney v. IRS,
The Coalition also argues that the prior release of some of the documents, in whole or part, destroys the credibility of the index and affidavits. We are not persuaded that the fact the UMRSFFS report was ultimately released and that some of the information in the final report was contained in the requested documentation affects the deliberative or predecisional nature of the requested documents.
We therefore conclude the Vaughn index is sufficient to establish that some of the information requested is, in fact, exempted by the deliberative process privilege. However, because the district court failed to analyze the segregability of the documents, we cannot conclude at this time that the privilege applied, as the district court concluded, to all 83 responsive documents in their entirety.
Segregability
In a FOIA action, the focus is on the information sought, not the docu-
*1212
raents themselves.
Schiller v. N.L.R.B.,
In every case, the district court must make an express finding on the issue of segregability.
Morley v. CIA,
For example, if only ten percent of the material is non-exempt and it is interspersed line-by-line throughout the document, an agency claim that it is not reasonably segregable because the cost of line-by-line analysis would be high and the result would be an essentially meaningless set of words and phrases might be accepted. On the other extreme, if a large proportion of the information in a document is non-exempt, and it is distributed in logically related groupings, the courts should require a high standard of proof for an agency claim that the burden of separation justifies nondisclosure or that disclosure of the non-exempt material would indirectly reveal the exempt information.
Mead Data Cent, Inc.,
Here, the district court made no findings on the issue of segregability. Although the issue was properly raised and preserved for appeal, we are unable to determine from the record whether the issue was considered and rejected or not consid *1213 ered at all. 3 Therefore, we must remand the case for a segregability analysis consistent with this opinion.
III.
We remand for further proceedings.
Notes
. The Coalition previously submittеd a similar request in 2003, before the UMRSFFS was fully completed, and subsequently withdrew the FOIA request in anticipation of the later release of the information.
. We offer no opinion whether the index and affidavits are sufficient to complete the seg-regability analysis contemplated by this opinion. On remand, the district court is free to conduct the analysis as it deems appropriate, be that on the record as it exists, by requesting a more detailed index or affidavit, or, as a last resort, by conducting an in camera review.
