Errata Sheet for

SEC-00150 St. Louis Airport Storage Site (SLAPS)

Evaluation Report Rev.0 

Approved April 13, 2010 

Errata Sheet Administrative Summary

Petition Under Evaluation

Errata for Petition Number: SEC-00150

Petition Type: 83.13

Evaluation Report Approval Date: April 13, 2010

DOE/AWE Facility Name: St. Louis Airport Storage Site (SLAPS)

ORAU Preparation and Review

ORAU Lead Technical Evaluator: Joe Guido

ORAU Peer Review Completed By: Daniel Stempfley

DCAS Review and Approval

Peer Review Completed By:

[Signature on File]

LaVon Rutherford 

April 10, 2017

SEC-00150 Errata Reviewed By:

[Signature on File]

James W. Neton

April 10, 2017

SEC-00150 Errata Approved By:

[Signature on File]

Stuart L. Hinnefeld 

April 10, 2017 
Errata for SEC-00150, Rev. 0 04-10-2017 St. Louis Airport Storage Site

Page 2 of 4

Errata Sheet for

SEC Petition Evaluation Report SEC-00150

NIOSH has identified discrepancies in Sections 5.2.1.1, 5.2.1.2, 5.2.1.3, 5.2.2.1, and 7.2.1.2 of 

the SLAPS SEC evaluation report, SEC-00150. The correct values with the corresponding text 

and reference callouts are identified below.

CHANGES TO SECTION 5.2.1.1

January 3, 1947 through November 2, 1971

PDF p. 20, first paragraph under this heading should read: The pitchblende raffinate, Am-7, 

was a product of operations at the Mallinckrodt Destrehan Street Refinery. Total uranium in the 

Am-7 residues was reported to be approximately 0.2% (AEC, 1949, p. 94).

PDF p. 21, second paragraph under this heading should read: The Am-10 raffinate was a 

residue resulting from the processing of domestic ores at the Mallinckrodt Destrehan Street 

Plant. For the Am-10, the total uranium was reported to be 47.6 tons U in 32,500 gross tons of 

material (0.15%) (Unknown, 1959).

PDF p. 21, third paragraph under this heading should read: Barium sulfate cake residue, AJ4, was another product of the Mallinckrodt Destrehan Street Refinery. Various concentrations of 

uranium were reported in a 1965 tabulation as varying between 0.08% for leached material to 

1.5% for unleached material (DOE, 1979). An earlier report (1948) reported a uranium content 

of 0.276% (Sargent, 1948).

PDF p. 21, fourth paragraph under this heading should read: C-Liner slag consisted mainly 

of dolomite liner with less than 2% uranium content (Unknown, 1959), and was stored in bulk on 

the ground at SLAPS. Shipments to SLAPS began March 10, 1946 and lasted until early 1953, 

when the dolomite liner was replaced by a recycled magnesium-fluoride liner. An April 11, 1959 

inventory showed 7,800 tons of C-Liner slag containing 122.3 tons of uranium (Unknown, 

1959). A portion was sent to Fernald for processing in the early 1960s. A November 1965 

inventory showed 4,000 tons containing 49 tons uranium (Aerospace Corporation, post-1973). 

Because of the chemical separation of uranium from the daughter isotopes, this material may be 

fully characterized by the amount of uranium present.

PDF p. 21, fifth paragraph under this heading should read: The vitro residues contained 

uranium after separation from uranium daughters. It was described as having 1.9 tons of 

uranium within 290 tons of material, or 0.66% by weight (Unknown, 1959). Because of the 

chemical separation of uranium from the daughter isotopes, this material may be fully 

characterized by the amount of uranium present.

PDF p. 21, sixth paragraph under this heading should read: The Captured Japanese Sands 

are assumed to contain uranium in equilibrium with the uranium daughters. It was described as 

having 0.2 tons of uranium within 60 tons of material or 0.3% by weight (Unknown, 1959;

Aerospace Corporation, post-1973). Because the uranium has not been chemically separated 

from the daughter isotopes, this material may be fully characterized by the amount of uranium 

present. The activity concentration of the daughters may be assumed to be in equilibrium with 

the uranium activity concentration.
Errata for SEC-00150, Rev. 0 04-10-2017 St. Louis Airport Storage Site

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PDF p. 21, seventh paragraph under this heading should read: Interim residue plant tailings 

were from operations at the Mallinckrodt Destrehan Street site, which began in 1955 to scalp the 

uranium content from the magnesium fluoride slag. The tailings were described as the end 

product from "non-uranium bearing slurry" (MCW, 1956, p. 6). In the late 1950s, the tailings 

were shipped to Fernald and processed, with the Fernald process rate increasing to about 600 

tons per month in July 1959 (Aerospace Corporation, post-1973; Army Corps, 2002, p. 36; 

Belcher, 1964). The magnesium-fluoride slag (C-701) was contaminated with only uranium 

after chemical separation from the uranium daughters. The bulk of the material was described as 

having 144.4 tons of uranium within 7,000 tons of material (Aerospace Corporation, post-1973). 

CHANGES TO SECTION 5.2.1.2

January 3, 1947 through November 2, 1971

PDF p. 22, second paragraph under this heading should read: Radium-226 bearing materials

at the site included the K-65 residues stored between 1946 and 1949, and the AJ-4 residues 

which were stored between 1946 and 1967. Analyses of the K-65 residue material showed 

radium-226 concentrations ranging from 300 to 900 mg/ton (0.327 uCi/g to 0.980 uCi/g, 

respectively) (Lynch, 1949; AEC, 1949; Eisenbud, unknown). The K-65 residues were 

eventually transferred to Fernald. A 1979 report indicates a total weight for the residues as 1,757 

dry tons, and having a total of 10,982 pounds of U3O8 (NLCO, 1979, p. 21). Analyses for other 

isotopes have not been located.

PDF p. 22, third paragraph under this heading should read: Barium sulfate cake residue, AJ4, was another product of the Mallinckrodt Destrehan Street Refinery. Radium-226 

concentrations were reported as high as 1.7 g/ton (1850 pCi/g) (Layfield, 1962).

CHANGES TO SECTION 5.2.1.3

January 3, 1947 through November 2, 1971

PDF p. 23, second paragraph under this heading should read: Thorium-230 was measured to 

be 76,760 pCi/g in Am-7 residues (Figgins, 1966).

CHANGES TO SECTION 5.2.2.1

PDF p. 24, second paragraph under this heading should read: A survey taken in March 1948

indicated a reading of 17.6% of the 12.5 mR/hr tolerance value (2.2 mR/hr) at a distance two feet 

from the K-65 storage shed (Soil Data, 1948). This shed contained the greatest amounts of 

radium-226 and represented the highest gamma exposure potential at the site; these residues 

were removed between 1948 and 1949.

CHANGES TO SECTION 7.2.1.2

January 1, 1984 through December 31, 1998

PDF p. 31, first paragraph under this heading should read: For the period from January 1, 

1984 through December 31, 1998, air sampling was performed as part of the environmental 

monitoring program and as part of the personnel radiation protection program. The 
Errata for SEC-00150, Rev. 0 04-10-2017 St. Louis Airport Storage Site

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environmental monitoring data covers the period in numerous environmental reports and data 

reports (Bechtel, 1985; Environmental Report, 1985; Environmental Report, 1987; 

Environmental Report, 1989; TLD Data, 1985; TLD Data, 1987a; TLD Data, 1988; TLD Data, 

1990). Personnel air monitoring is covered in two reports; one report covers one individual in 

1993 (Air Data, 1993) and a 1996 report covers a large number of workers in 1996 (Air Data, 

1996). The data consistently indicate very low levels of airborne radioactivity; the total exposure 

recorded for 685 worker samples in 1996 was 16.32 DAC-h. The evaluation of DAC-h was 

based on thorium-230 as the isotope of concern. NIOSH believes that these data can be used to 

supplement the bounding assessment of internal dose for this period at SLAPS.

CHANGES TO REFERENCES

This reference was a duplicate reference and has been removed from the SRDB. The 

current SRDB number is included here: Figgins, 1966, Survey of Sources of Ionium (Thorium230); P. E. Figgins and H. W. Kirby; August 1, 1966; SRDB Ref ID: 14987

This reference was added: Layfield, 1962, Pre-Licensing Visit to the Contemporary Metals 

Corporation Proposed Facility at Hazelwood, Missouri, and Residue Stockpiles at Robertson, 

Missouri, Docket No. 40-6811, memorandum to files; Robert Layfield; September 25, 1962; 

SRDB Ref ID: 9823