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Blockson Chemical Company (Building 55 and related activities)

On This Page

Special Exposure Cohort
Worker Outreach Activities
Advisory Board Work Group
Technical Documents
Advisory Board and NIOSH Discussions
Program Evaluation Plans and Reports (PEPs and PERs)
Public Comments
Miscellaneous Documents
Document Archive

(Site Profile/Docket Number 013)

Location: Joliet, Illinois

Also Known As: Blockson Chemical Group, Olin, Olin Mathieson

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 Blockson Chemical Company – Building 55.

Class(es) Added to the SEC

All Atomic Weapons Employer employees who worked at the Blockson Chemical Company in Joliet, Illinois from March 1, 1951 to June 30, 1960, for a number of work days aggregating at least 250 work days, occurring either solely under this employment, or in combination with work days within the parameters established for one or more other classes of employees included in the Special Exposure Cohort.

Note: This class was established from Petition 58.

Class(es) Not Added to the SEC

All employees who worked in any area at the Blockson Chemical Co. site in Joliet, Illinois, during the period from July 1, 1960, through December 31, 1991.

Note: This class was established from Petition 225.

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 45
Steps in Petition Process:	Petition Details:
Date Received	October 24, 2005
Date Qualified for Evaluation	March 6, 2006
Summary of Information in Petition	Location: Joliet, Illinois Job Titles and/or Job Duties: Utility Engineer, Laborer, Research Chemist, Relief Operator, Plant Operator, Maintenance and Pipefitter, Lead Mixer, Operator, and Supervisor HF Acid Period of Employment: October 10, 1952 through December 31, 1962. 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	October 24, 2005 [2.2 MB (64 pages)] (October 10, 1952 to December 31, 1962)
Federal Register Notice Announcing that a Blockson Chemical Company SEC Petition has met the Minimum Qualifications for Review and Evaluation	March 27, 2006 [101 KB (1 page)] (October 10, 1952 through December 31, 1962)
SEC Petition Evaluation Report	Merged with Petition 58
Evaluation Report Sent to the Advisory Board	Merged with Petition 58
Petition Discussed by the Advisory Board	Merged with Petition 58
Advisory Board Recommendation on SEC Petition	Merged with Petition 58
HHS Letters to Congress Regarding the SEC Petition	Merged with Petition 58
HHS Designation/Determination of Additional Members to the SEC	Merged with Petition 58
Federal Register Notice: Designation/Determination of a Class of Employees for Addition to the Special Exposure Cohort	Merged with Petition 58
Effective Date for the SEC Class	Merged with Petition 58
Federal Register Notice: Final Effect of Designation of a Class of Employees for Addition to the Special Exposure Cohort	Merged with Petition 58
Letter to DOL Regarding the Addition of a New Class of Employees to the SEC	Merged with Petition 58

Petition 58
Steps in Petition Process:	Petition Details:
Date Received	May 11, 2006
Date Qualified for Evaluation	August 2, 2006
Summary of Information in Petition	Location: Building 55 Job Titles and/or Job Duties: Filter Operator: Separated solids and liquids from phosphor rock, acids and uranium that came from the plant Period of Employment: July 1947 through June 1990 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	May 11, 2006 [1.0 MB (70 pages)] (July 1947 through June 1990)
Federal Register Notice Announcing that a Blockson Chemical Company SEC Petition has met the Minimum Qualifications for Review and Evaluation	August 17, 2006 [80 KB (1 page)] (January 1, 1951 to December 31, 1962)
SEC Petition Evaluation Report	Revised July 3, 2007 (Rev. 2) [231 KB (50 pages)] (January 1, 1951 to December 31, 1962)
Evaluation Report Sent to the Advisory Board	July 3, 2007 (Revision 2) (January 1, 1951 to December 31, 1962)
Petition Discussed by the Advisory Board	The petition was discussed by the Advisory Board on December 11-13, 2006; July 18, 2007; January 9, 2008; April 9, 2008; February 10, 2010; February 18, 2009; July 28, 2009; October 20, 2009; May 20, 2010; and July 14, 2010, during its regular meetings. Note: Agendas and transcripts for Board meetings will be posted on the Advisory Board and Public Meetings page as soon as they become available.
Advisory Board Recommendation on SEC Petition	August 4, 2010 [34 KB (2 pages)] (March 1, 1951 to June 30, 1960)
HHS Letters to Congress Regarding the SEC Petition	September 2, 2010 [109 KB (11 pages)] (March 1, 1951 to June 30, 1960)
HHS Designation/Determination of Additional Members to the SEC	Designation: September 3, 2010 [49 KB (6 pages)] (March 1, 1951 to June 30, 1960) Note: A “designation” means that HHS is recommending a class be added to the SEC. A “determination” means that HHS is recommending a class not be added to the SEC.
Federal Register Notice: Designation/Determination of a Class of Employees for Addition to the Special Exposure Cohort	Designation: September 17, 2010 [78 KB (1 page)] (March 1, 1951 to June 30, 1960) Note: A “designation” will be published if there is a recommendation to add a class to the SEC. A “determination” will be published if there is a recommendation not to add a class to the SEC.
Effective Date for the SEC Class	October 3, 2010 (March 1, 1951 to June 30, 1960) Note: This only applies if the class is added to the SEC.
Federal Register Notice: Final Effect of Designation of a Class of Employees for Addition to the Special Exposure Cohort	November 2, 2010 [57 KB (2 pages)] (March 1, 1951 to June 30, 1960) Note: This only applies if the class is added to the SEC.
Letter to DOL Regarding the Addition of a New Class of Employees to the SEC	October 5, 2010 [49 KB (1 page)] (March 1, 1951 to June 30, 1960) Note: This only applies if the class is added to the SEC.

Petition 225
Steps in Petition Process:	Petition Details:
Date Received	February 24, 2015
Date Qualified for Evaluation	May 5, 2015
Summary of Information in Petition	Location: Joliet, Illinois Job Titles and/or Job Duties: All workers who worked in any area Period of Employment: January 1, 1952 through December 31, 1991 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 petitioning process and if an SEC class is proposed, the proposed class may not exactly match the above information.
Copy of the Petition Received	February 24, 2015 [882 KB (9 pages)] (January 1, 1952 through December 31, 1991)
Federal Register Notice Announcing that a Blockson Chemical Company SEC Petition has met the Minimum Qualifications for Review and Evaluation	May 13, 2015 [199 KB (2 pages)] (July 1, 1960 through December 31, 1991)
SEC Petition Evaluation Report	September 8, 2015 [455 KB (43 pages)] (July 1, 1960 through December 31, 1991)
Evaluation Report Sent to the Advisory Board	September 9, 2015 (July 1, 1960 through December 31, 1991)
Petition Discussed by the Advisory Board	The Advisory Board discussed this petition on November 19, 2015, during its regular meeting. Note: Agendas and transcripts for Board meetings will be posted on the Advisory Board and Public Meetings page as soon as they become available.
Advisory Board Recommendation on SEC Petition	October 20, 2016 [46 KB (1 page)] (July 1, 1960 through December 31, 1991)
HHS Letters to Congress Regarding the SEC Petition	December 21, 2016 [80 KB (12 pages)] (July 1 , 1960 through December 31, 1991)
HHS Designation/Determination of Additional Members to the SEC	Determination: December 21, 2016 [71 KB (4 pages)] (July 1 , 1960 through December 31, 1991) Note: A “designation” means that HHS is recommending a class be added to the SEC. A “determination” means that HHS is recommending a class not be added to the SEC.
Federal Register Notice: Designation/Determination Regarding a Class of Employees for Addition to the Special Exposure Cohort	Determination: January 6, 2017 [79 KB (1 page)] (July 1, 1960 through December 31, 1991) Note: A “designation” will be published if there is a recommendation to add a class to the SEC. A “determination” will be published if there is a recommendation not to add a class to the SEC.
HHS Administrative Review Documents	November 2, 2018 [3.1 MB (10 pages)] (July 1, 1960 through December 31, 1991)
Effective Date for the SEC Class	Note: This only applies if the class is added to the SEC.
Federal Register Notice: Final Effect of Designation of a Class of Employees for Addition to the Special Exposure Cohort	Note: This only applies if the class is added to the SEC.
Letter to DOL Regarding the Addition of a New Class of Employees to the SEC	Note: This only applies if the class is added to the SEC.

Worker Outreach Activities

Based on a recommendation from the Advisory Board to provide workers and site experts with opportunities to participate in developing the technical documents used in dose reconstruction, NIOSH established a Worker Outreach Program.

At Worker Outreach Meetings, current and former DOE and AWE employees have opportunities to obtain information about Site Profiles, Technical Basis Documents, and Technical Information Bulletins, and to provide information for consideration and possible use in dose reconstruction. This process is valuable to ensure that the technical documents used in dose reconstruction contain correct and useful information.

Worker Outreach Activities for the Blockson Chemical Company – Building 55:

September 12, 2007
Meeting with former Blockson/Olin Chemical Company workers and survivors of former workers in Joliet, IllinoisJoliet Municipal Building
150 West Jefferson
Joliet, Illinois
Final Minutes [103 KB (32 pages)]
January 24-25, 2007
Meeting with former workers from Blockson Chemical Company, Joliet, IllinoisJoliet Municipal Building
150 West Jefferson
Joliet, Illinois
7:00 p.m.
Note: Former workers are welcome to attend either or both meetings and we encourage you to invite other workers who may have knowledge about the former Blockson Chemical Company. Please note that these meetings are not being held to discuss individual claims or concerns about the EEOICPA program. The meetings will be transcribed by a court reporter and the transcript will be made available to the public.
Transcript from January 24, 2007 [3.9 MB (152 pages)]
Minutes from January 25, 2007 [156 KB (35 pages)]

Advisory Board Work Group on Blockson Chemical Company

This Work Group is responsible reviewing the SEC petition from the Blockson Chemical Company petitioners, reviewing the NIOSH Evaluation Report of the petition, considering issues that may be raised by the Board’s contractor (SC&A) concerning the NIOSH Evaluation Report, and for assisting NIOSH and SC&A in the resolution of such issues. The Work Group may recommend to the Board, changes in the Site Profile as appropriate. The Work Group should strive to develop a recommendation to the Board on whether a class should be added to the SEC.

Work Group Members:

Genevieve S. Roessler, Ph.D. (Chair)
Victoria A. Cassano, M.D., M.P.H.
Bradley P. Clawson
Loretta R. Valerio

Meeting Information:

June 28, 2016
Teleconference Meeting of the Advisory’s Board’s Work Group on Blockson Chemical Company

Time/Location:

11:00 a.m. (Eastern Time)
Meeting Type: Teleconference; Public, No Comment Period

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- Agenda [121 KB (1 page)]
- Transcript [265 KB (80 pages)]
Background/Discussion Papers:
January 23, 2009
Teleconference Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

12:30 p.m. Eastern Standard Time (EST)
Meeting Type: Teleconference; Public, No Comment Period

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- Transcript [306 KB (30 pages)]
December 12, 2008
Teleconference Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

9:00 a.m. Eastern Standard Time (EST)
Meeting Type: Teleconference; Public, No Comment Period

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- An agenda will be provided at a later date.
- Transcript [455 KB (95 pages)]
October 15, 2008
Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

9:30 a.m. Eastern Standard Time (EST)
Meeting Type: Face-to-Face; Public, No Comment Period

Cincinnati Airport Marriott
2395 Progress Dr.
Hebron, KY 41048
Phone: (859) 586-0166

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- An agenda will be provided at a later date.
- Transcript [2.4 MB (235 pages)]
June 24-25, 2008
Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

June 24: 5:15 p.m. Central Standard Time (CST)
June 25: 4:00 p.m. Central Standard Time (CST)
Meeting Type: Face-to-Face; Public, No Comment Period

Millennium Hotel Complex
200 S. 4th Street
St. Louis, MO 631121
Phone: (314) 241-9500

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- An agenda will be provided at a later date
- Transcript [435 KB (109 pages)]
June 5, 2008
Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

9:30 a.m. Eastern Standard Time (EST)
Meeting type: Face-to-Face; Open to Public; No Public Comment Period

Cincinnati Airport Marriott
2395 Progress Dr.
Hebron, KY 41048
Phone: (859) 586-0166

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- An agenda will be provided at a later date.
- Transcript [637 KB (171 pages)]
November 19, 2007
Teleconference Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

11:00 a.m. Eastern Standard Time (EST)
Meeting Type: Teleconference; Public, No Comment Period

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- An agenda will be provided at a later date.
- Transcript [118 KB (24 pages)]
November 2, 2007
Teleconference Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

11:00 a.m. Eastern Standard Time (EST)
Meeting Type: Teleconference; Public, No Comment Period

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- An agenda will be provided at a later date.
- Transcript [242 KB (59 pages)]
August 28, 2007
Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

Time/Location:

10:00 a.m. Eastern Standard Time (EST)
Meeting Type: Face-to-Face; Public, No Comment Period

Cincinnati Airport Marriott
2395 Progress Dr.
Hebron, KY 41048
Phone: (859) 586-0166

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- Agenda: This meeting has been scheduled to discuss Blockson Chemical Company
- Transcript [410 KB (110 pages)]
January 9, 2007
Teleconference Meeting of the Advisory Board’s Work Group on Blockson Chemical Company

5:30 p.m. Pacific Standard Time (PST)
Meeting Type: Teleconference; Public, No Comment Period

Teleconference: +1-866-659-0537
Participant Code: 9933701

Pre-Decisional Document Policy

Available Meeting Items:
- Agenda: To discuss Blockson Chemical Company
- Transcript [194 KB (49 pages)]

Pre-Decisional Document Policy

Please note that as part of the procedures and processes of the Advisory Board’s Work Groups, several kinds of pre-decisional documents may be developed. These pre-decisional documents, such as white papers, matrices, working drafts, etc., are distributed among Work Group members as research and background tools to facilitate discussion and deliberation. Although discussion during a public meeting may cover pre-decisional documents, these documents often are not further revised or finalized, and thus do not reflect the final determination or evaluation of the Advisory Board and its Work Groups. Additionally, some pre-decisional documents not otherwise posted on the website may contain sensitive information, which would require an interested party to obtain such documents by filing a Freedom of Information Act (FOIA) request with the CDC/ATSDR FOIA office at foiarequests@cdc.gov.

Technical Documents

If the energy employee’s personal radiation information is incomplete, NIOSH will use other sources to estimate the radiation dose. This may involve using technical documents called Site Profiles, Technical Basis Documents, and Technical Information Bulletins.

Technical Basis Documents

Technical Basis Document for Atomic Energy Operations at Blockson Chemical Company, Joliet, Illinois [918 KB (47 pages)]
Revised May 19, 2014
Revision Includes: Incorporates review comments.

Advisory Board and NIOSH Discussions on Blockson Chemical Company

The Blockson Chemical Company discussion papers listed below are working documents prepared by NIOSH or its contractor for use in discussions with the Advisory Board on Radiation and Worker Health or its Working Groups or Subcommittees. Draft, preliminary, interim, and white paper documents are not final NIOSH or Advisory Board (or their technical support and review contractors) positions unless specifically marked as such. These documents represent preliminary positions taken on technical issues prepared by NIOSH or its contractor.

The discussion papers have been reviewed to identify and redact any information that is protected by the Privacy Act 5 USC §552a and has been cleared for distribution.

SC&A Memo: Final SC&A Position on the Application of Overtime Hours at Blockson [95 KB (8 pages)]
May 22, 2018
NIOSH/DCAS Memo: NIOSH Response on Open TBD Issues, Memorandum to the Blockson Chemical Work Group [114 KB (6 pages)]
March 9, 2018
NIOSH/DCAS Presentation: Surrogate Data Usage Blockson Chemical Company Special Exposure Cohort Petition SEC00225 [181 KB (13 pages)]
Presented at the August 9-10, 2016, Meeting of the Advisory Board on Radiation and Worker Health
Advisory Board Presentation: Blockson Chemical Company SEC-00225[560 KB (11 pages)]
Presented at the August 9-10, 2016, Meeting of the Advisory Board on Radiation and Worker Health
SC&A Memo: SC&A Responses to NIOSH Response to SC&A Findings on SEC-00225 Blockson Chemical Company Residual Contamination Period, Dated May 23, 2016 [357 KB (5 pages)]
June 15, 2016
SC&A Draft: Draft Review of Blockson Chemical Company Residual Period SEC-00225 [846 KB (47 pages)]
Contract No. 211-2014-58081
SCA-TR-2016-SEC003, Revision 1
June 3, 2016
NIOSH/DCAS: NIOSH Response to SC&A Findings on Blockson Chemical Company Special Exposure Cohort (SEC) Petition 225 Residual Contamination Period [188 KB (5 pages)]
May 23, 2016
NIOSH/DCAS Presentation: Blockson Chemical Company Special Exposure Cohort (1960 – 1991, Joliet IL) [216 KB (21 pages)]
Presented at the November 18-19, 2015, Meeting of the Advisory Board on Radiation and Worker Health
SC&A Draft: Strategies for Validating the Blockson Radon Model and Addressing Stratification Issues [40 KB (6 pages)]
September 9, 2009
SC&A Draft: A Preliminary Review of NIOSH’s Program Evaluation Report OCAS-PER-020, “Blockson TBD Revision” [294 KB (25 pages)]
Contract No. 200-2009-28555
SCA-TR-TASK3-0012, Rev. 0
March 2009
SC&A Draft: Evaluation of Radon Levels in Building 40 at Blockson Chemical Company [546 KB (35 pages)]
August 12, 2008
SC&A Memo and Draft Report: Focused Review of the NIOSH Evaluation Report for the Blockson Chemical Company SEC Petition [471 KB (38 pages)]
Contract No. 200-2004-03805
Task Order No. 5
January 10, 2007

Program Evaluation Plans (PEPs) and Program Evaluation Reports (PERs)

NIOSH is committed to applying the best available science in dose reconstructions. In keeping with this commitment, completed cases with probabilities of causation less than 50% are reviewed as relevant new information becomes available. The results of these reviews are described in a Program Evaluation Report (PER). The PER details the effect, if any, of the new information on the completed dose reconstruction. If it appears that the new information may result in an increase in dose for a completed dose reconstruction with a probability of causation of less than 50%, NIOSH is committed to working with the Department of Labor to reopen and rework the dose reconstruction, as appropriate. A Program Evaluation Plan (PEP) describes plans for evaluating specific program details or issues.

DCAS-PER-060: Blockson Chemical Company [16 KB 2 pages)]
April 27, 2015

About this Document: Determines the effect of the revised Technical Basis Document for the Blockson Chemical Company on previously completed claims.

Summary: Out of the potentially effected claims, one resulted in a higher internal dose. A full dose estimate was completed using TBD revision 4, as well as all applicable approved dose reconstruction methods. The probability of causation remained below 45% for this claim. No claims need to be returned to NIOSH. NIOSH will provide DOL with the list of all the claims evaluated under this PER.
DCAS-PER-036 Rev-0: Program Evaluation Report: Blockson TBD Revision [18 KB (3 pages)]
April 5, 2012

About this Document: New document to determine which previously completed claims require evaluation for the affect of revising the Blockson TBD.

Summary: Revision 3 of the Blockson Chemical Company Technical Basis Document (DCAS-TKBS-0002) was issued on 12/20/2010. The previous version (revision 2) was issued on 11/21/2007. PER-020, issued on 7/31/2007, evaluated the effect of all changes that were made to the Blockson Chemical Company Technical Basis Document (TBD) prior to that date. This resulted in a request to DOL for the return of all previously completed Blockson claims that had a probability of causation of less than 50%. Once returned, a new dose reconstruction was completed for each using the version of the TBD current at that time. Revision 1 of the TBD was current when PER-020 was issued. However, revision 2 was issued a short time later on 11/21/2007 prior to any claims being completed using revision 1. Therefore, this PER only considered the changes that were made between revision 2 and revision 3. This information is summarized below:
- Revision 0 all claims completed using revision 0 were requested returned (PER-020).
- Revision 1 No claims were completed using this revision
- Revision 2 The subject of this PER
- Revision 3 The current version of the TBD
OCAS-PER-0020 Rev-00: Program Evaluation Report: Blockson TBD Revision [14 KB (1 page)]
July 31, 2007

About this Document: New document to determine which previously completed claims require evaluation for the effect of revising the Blockson TBD.

Summary: It is not possible to determine the magnitude of the change to dose without a new dose estimate. Since (as of issuance of this PER) no Blockson Chemical Company claims have yet been completed with the newest revision to the TBD, NIOSH is requesting that all Blockson Chemical Company claims with a Probability of Causation less than 50% be returned for a new estimate. A list of the entire population of the ninety-one potentially affected claims is attached. A new dose reconstruction will be completed for each of the claims using the latest revision to the Blockson TBD.

Public Comments on Blockson Chemical Company Documents

How to Submit Comments

Comments on Blockson Chemical Company
Documents can be submitted to the NIOSH Docket Officer electronically by email at nioshdocket@cdc.gov 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 (013) on all comments.

Comments Received

Comments from Richard D. Miller on behalf of GAP: Comments: Site Profile–Blockson Chemical Company, Joliet, Illinois [61 KB (1 page)]
November 29, 2003

Miscellaneous Documents Regarding Blockson Chemical Company

Letter from DOL regarding which portions of the facility are covered under EEOICPA. [989 KB (1 page)]

Document Archive for Blockson Chemical Company

Special Exposure Cohort Petition Evaluation Report for Blockson Chemical Company [244 KB (35 pages)]
Approved September 5, 2006
Technical Basis Document for Atomic Energy Operations at Blockson Chemical Company, Joliet, Illinois
- Revised December 20, 2010 [685 KB (47 pages)]
  Revision Includes: Incorporates review comments.
- Revised November 21, 2007 [1.7 MB (46 pages)]
  Revision Includes: Changed footnote 2 of Table 4a and footnote 3 of Table 12a to require consideration of Type M and Type S thorium in Building 55. Corrected an error in the liver dose in Table 8. Corrected errors in columns of Table 7 and resulting graph in Figure 6. No other changes were made.
- Revised June 20, 2007 [1.1 MB (46 pages)]
  Revision Includes: Incorporates review comments. Revised internal and external dose modeling. Added additional site information and radiological data discussion. Changes results in an increase of dose, and a PER is required.
- Revised September 11, 2006 [1.3 MB (27 pages)]
  Revision Includes: Incorporates resolution of review comments. This supersedes ORAUT-TKBS-0002 (previously revised document dated June 29, 2004).
Technical Basis Document for the Development of an Exposure Matrix for Blockson Chemical Company
- Revised June 29, 2004 [1.6 MB (19 pages)]
- Approved October 10, 2003 [818 KB (21 pages)]