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Monsanto Chemical Company (now listed as The Dayton Project)

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Also Known As: Runnymeade Playhouse, Scioto Laboratory, Dayton Project, Old Schoolhouse, Units I, III and IV
State: Ohio
Location: Dayton
Time Period: 1943-1949; Residual Radiation 1950
Facility Type: Atomic Weapons Employer, Department of Energy
Facility Description: In 1943, the Manhattan Engineer District began the Dayton Project to investigate the chemistry and metallurgy of polonium. Monsanto was chosen for the project because of its earlier work at its Scioto Research Laboratory (also in Dayton). Work for the MED was initially performed at Monsanto’s facility on Nicholas Road in 1943 (Unit I). As the project expanded, it moved into a location on West First Street (Unit III) with all operations being transferred to Unit III by October 1944. By 1944 it was clear that even this space was inadequate, and so the former Runnymeade Playhouse was converted to a laboratory and referred to as Unit IV, to be operated in conjunction with Unit III. When space became too tight in the combined areas of Units III and IV, preparations were made to move the operations to the present day Mound facility in Miamisburg. Processing began at Mound in February 1949 and shortly thereafter Units III and IV were dismantled and decontaminated.
Monsanto Chemical Co. is listed as an Atomic Weapons Employer (AWE) site from 1943-1949, and as a Department of Energy (DOE) site after 1950 under the EEOICPA.
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.
As of 08/23/2015, the total compensation paid under Parts B and E of the EEOICPA, including medical compensation, for workers suffering from the effects of having worked at Monsanto Chemical Co. is $601,741.
Monsanto Chemical Co. Workers:
If you or your parent worked at this or any other DOE or AWE facility and became ill, you may be entitled to compensation of up to $400K plus medical benefits from the US Department of Labor. Call EEOICPA Counsel Hugh Stephens at 1-855-EEOICPA (336-4272) or fill out the form to the right, whether or not you have already filed a claim and even if your claim has been accepted or denied.
We can help with all OWCP (Federal Workers Compensation) claims, impairments, wage loss and health care. 2495 Main Street, Suite 442 Buffalo, NY.
*Dayton I Site
In the late 1940’s, Dayton Unit I was utilized by Monsanto Chemical Company to support the nation’s early atomic energy program, under contract by the Manhattan Engineering District and the Atomic Energy Commission (AEC). The site was specifically used for research, chemical and quality control purposes.
Dayton III Site
The former Bonebrake Theological Seminary was acquired by the Atomic Energy Commission (AEC) in 1943 for the research, development, and processing of polonium. The site was operated by the Monsanto Chemical Company until the project was ended in 1948.
Dayton IV
In 1944, the former Runnymede Playhouse was acquired by the Atomic Energy Commission (AEC) for chemical and metallurgical processing of polonium. By 1950, the structure used in this process was demolished, and all radioactive residuals were shipped to Oak Ridge National Laboratory, Oak Ridge, Tennessee.
Dayton Warehouse
In 1944, the former Runnymede Playhouse was acquired by the Atomic Energy Commission (AEC) for chemical and metallurgical processing of polonium. By 1950, the structure used in this process was demolished, and all radioactive residuals were shipped to Oak Ridge National Laboratory, Oak Ridge, Tennessee.
**In the summer of 1942, the United States organized the Manhattan Engineering District to
develop an atomic weapon which became known as the Manhattan Project. In 1943, the
Monsanto Chemical Company (Central Research Department in Dayton, Ohio) accepted responsibility for the chemistry and metallurgy for producing Polonium-2 10. Operations began at the Central Research Facility located on Nicholas Road in Dayton, Ohio and became known as Unit I (PRS 320).7 As the project progressed, other facilities were acquired. In 1943 an old unused building known as the Bonebreak Theological Seminary, located at 1601 West First Street, Dayton, Ohio, was rented. This facility became known as Unit III (PRS 322). In 1944 Monsanto acquired a facility known as the Runnymede Playhouse, located in Oakwood, Ohio which became known as Unit IV (PRS 323). In 1946, several floors of an old Warehouse in downtown Dayton at Third and Sears Street were leased. This facility was known only as ” The Warehouse” (PRS 324). In 1947, a standby facility was constructed at Marion, Ohio at the same time the Mound Plant was being constructed. This facility was known only as “Marion” (PRS 325). In many of the historical documents Mound Plant is referred to as Unit V which was commissioned in 1948.
During the early years, Monsanto also operated a facility for the production of rocket propellant. The location of this facility was one-fourth mile east off State Route 741 adjacent to the Saint Henry Catholic Church property. This facility was known as Unit II, however it was never associated with the Manhattan Project.
Today all of these Units are no longer associated with the Mound Plant. Unit I was demolished and sold in the late 1980’s. Unit III was returned to the Dayton Board of Education in 1950. Unit
IV was transferred back the original owners (the Talbott family) in 1950. The Warehouse was
returned to the building manager for renting and the Marion facility was turned over to the
General Services Administration in the early 1950’s.
Petition 49 (Jan 1, 1943, to Dec 31, 1949)
SEC Petition Evaluation Report, Petition SEC-00049, Report Rev #
Report Submittal Date: 10-24-06