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The Dayton Project

(Site Profile/Docket Number 088)

Location: Dayton, Ohio

Also known as: Old Schoolhouse, Runnymeade Playhouse, Units I, III and IV

Note: The Dayton Project in Ohio has been designated as a DOE facility. It replaced Monsanto Chemical Company, which was delisted as an AWE by the Department of Energy on February 6, 2012.

Special Exposure Cohort Petition Information

The Special Exposure Cohort (SEC) is a unique category of employees established by the Act (42 CFR Part 83). Claims compensated under the SEC do not have to go through the dose reconstruction process. To qualify for compensation under the SEC, a covered employee must meet specific requirements (e.g., must have at least one of 22 “specified cancers,” and have worked for a specified time period at one of the SEC sites). Classes of employees and work sites can be considered for addition to the SEC through a NIOSH petition process. More information about the Special Exposure Cohort can be found on our Frequently Asked Questions page.

Open/Active SEC Petitions

To date, there are no open/active SEC petitions from The Dayton Project.

Class(es) Added to the SEC

  • Atomic Weapons Employer employees who were monitored or should have been monitored for exposure to ionizing radiation while working at Monsanto Chemical Company Units I, III, or IV in Dayton, Ohio, for a number of work days aggregating at least 250 work days during the period from January 1, 1943, through December 31, 1949, or in combination with work days within the parameters established for one or more other classes of employees in the SEC.

    Note: This class was established from Petition 49

Petitions Qualified for Evaluation

Below is a list of the petitions that qualified for evaluation. Select a petition on the list to view the table for that particular petition.

Petition 49 (Jan 1, 1943, to Dec 31, 1949)

Steps in Petition Process: Petition Details:

Date Received

January 9, 2006

Date Qualified for Evaluation

May 1, 2006

Summary of Information in Petition

Job Titles and/or Job Duties: Directors and subordinates, physicists, chemists, technicians, and workers

Period of Employment: 1943-1949

Note: The information above is what qualified for evaluation. During our evaluation of whether dose reconstructions can adequately be completed for the above job titles and period of employment, information may cause NIOSH to change some the dates or job titles/duties. Therefore, as this petition proceeds through the SEC petition process and if an SEC class is proposed, the proposed class may not exactly match the above information.

Copy of the Petition Received

January 9, 2006

Federal Register Notice Announcing that a Monsanto Chemical Company SEC Petition has met the Minimum Qualifications for Review and Evaluation

May 22, 2006 [43 KB (1 page)]

SEC Petition Evaluation Report

November 7, 2006 [345 KB (46 pages)]

Petition Discussed by the Advisory Board

The petition was discussed by the Advisory Board during its December 11-13, 2006, meeting in Naperville, Illinois.

Advisory Board Recommendation on SEC Petition

January 17, 2007 [214 KB (2 pages)]

HHS Letters to Congress Regarding the SEC Petition

February 16, 2007 [267 KB (6 pages)]

HHS Designation of Additional Members to the SEC


Federal Register Notice: Designation of a Class of Employees for Addition to the Special Exposure Cohort


Effective Date for the SEC Class

March 18, 2007

Federal Register Notice: Final Effect of Designation of a Class of Employees for Addition to the Special Exposure Cohort

April 10, 2007 [43 KB (1 page)]

Letter to DOL Regarding the Addition of a New Class of Employees to the SEC

March 29, 2007 [20 KB (1 page)]

Public Comments on The Dayton Project Documents

How to Submit Comments

Comments on The Dayton Project documents can be submitted to the NIOSH Docket Officer electronically by email at or printed comments can be mailed to:

NIOSH Docket Office
Robert A. Taft Laboratories, MS-C34
1090 Tusculum Avenue
Cincinnati, OH 45226
Please include the Site Profile/Docket Number (088) on all comments.

Comments Received

At this time, no comments have been submitted on The Dayton Project documents.