[Federal Register Volume 59, Number 195 (Tuesday, October 11, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-25060]


[[Page Unknown]]

[Federal Register: October 11, 1994]


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ENVIRONMENTAL PROTECTION AGENCY
[FRL-5088-6]

 

Technical Corrections on Additional Data Available on Cement Kiln 
Dust Waste Studied in the Report to Congress on Cement Kiln Dust

AGENCY: Environmental Protection Agency.

ACTION: Notice of corrections to data available for comment in RCRA 
Docket No. F-94-RC2A-FFFFF and extension of comment period on corrected 
materials.

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SUMMARY: This notice announces the availability, for public inspection 
and comment, of corrections to certain portions of data recently made 
available for public comment (see 59 FR 47133-47135, September 14, 
1994), pertinent to additional assessments of potential risks from 
cement kiln dust waste. This Notice also extends the period for public 
comment on the corrected materials. Specifically, these corrections 
pertain to Pages 1-19 through 1-30 and Attachment 1-4 of Section 1 of 
the Technical Background Document on Human Health and Environmental 
Risk Assessment in Support of the Regulatory Determination on Cement 
Kiln Dust, Section 1 being titled ``Expanded Risk Assessment for the 
Onsite Management of Cement Kiln Dust.'' This Technical Background 
Document is Number S0019 in RCRA Docket No. F-94-RC2A-FFFFF. The 
corrected materials, in the form of substitute pages 1-19 (revised) 
through 1-30 (revised) and Attachment 1-4 (revised), have been placed 
in RCRA Docket No. F-94-RC2A-FFFFF as docket entry No. S0019.A, and 
have also been placed in EPA's Superfund electronic bulletin board 
(CLU-IN).
    There were five general errors in the CKD human health risk 
assessment materials which need to be corrected. They include:

--Fixing a ``rounding'' error which inadvertently assigned all 
facilities into a risk category one order of magnitude higher than 
estimated.
--Revising risk results for 5 sites to represent ``best-estimate'' 
results. (High-end risk estimates were inadvertently used.)
--Revised risk estimates for two sites located near lakes. The dilution 
capacity of the two lakes is actually orders of magnitude greater than 
what was used in the original material announced in the September 14, 
1994, notice.
--Revised risk estimates for 14 sites for which we did not have 
constituent concentrations. In the original document, risk estimates 
assumed 95th percentile concentrations for metals. In the revised 
tables, if risk at the sites could not be determined as negligible 
using the 95th percentile, then risk at the sites are listed as 
``unknown'' rather than estimating the risk using the 95th percentile 
assumption.
--Add the results of the aquatic pathway exceedances of constituent 
concentrations as defined in the Ambient Water Quality Criteria (AWQC). 
These were calculated but inadvertently left out of the previous 
document. They represent a risk element not included in the previous 
edition. The AWQC exceedance results is a new subsection inserted at 
the end of the revised results subsection.

DATES: Because of these corrections, the Agency is extending the 
comment period pertaining to Section 1 and Attachments to Section 1 of 
the Technical Background Document on Human Health and Environmental 
Risk Assessment, only, until November 10, 1994. The Agency is not 
reopening the comment period on the Report to Congress on Cement Kiln 
Dust, nor is it extending the comment period on any other sections of 
the Technical Background Document on Human Health and Environmental 
Risk Assessment or any other materials noticed for comment in 59 FR 
47133-35 as contained in RCRA Docket No. F-94-RC2A-FFFFF. As indicated 
in the previous notice, because of the Agency's commitment to make a 
regulatory determination by January 31, 1995, no extensions will be 
granted except as described in this notice.

ADDRESSES: Those persons, companies or organizations intending to 
submit comments for the record must send an original and two copies to 
the following address: RCRA Docket Information Center (5305), U.S. 
Environmental Protection Agency, 401 M Street, SW., Washington, DC 
20460. Please place the docket number F-94-RC2A-FFFFF on your comments.
    The additional data are available for public inspection at the RCRA 
docket, 401 M Street SW., Washington, DC, Room M2416, 2nd floor, 
Waterside Mall. Docket hours are 9 a.m. to 4 p.m., Monday through 
Friday, except Federal holidays. In order to view the docket, please 
call (202) 260-9327 to make an appointment. Comments on the new data 
will be accepted through [insert date 30 days from date of 
publication].
    Corrections to the document placed in the docket for this notice 
are also available in electronic format from EPA's Superfund electronic 
bulletin board (CLU-IN). The file name is CKD5.ZIP located in file area 
#6 (RCRA/Superfund/UST). The data number is (301) 589-8366; the voice 
number for help in using the CLU-IN bulletin board is (301) 589-8368. 
Modem settings are N-8-1 (parity, data bits and stop bit, 
respectively), and data transmission rate up to 9600 bps.

FOR FURTHER INFORMATION CONTACT: For general information, contact the 
RCRA/Superfund Hotline at (800) 424-9346 or (202) 260-3000; for 
technical information contact Bill Schoenborn (5302W), U.S. 
Environmental Protection Agency, 401 M Street SW., Washington, DC 
20460, (703) 308-8483.

    Dated: October 3, 1994.
Elliott P. Laws,
Assistant Administrator.
[FR Doc. 94-25060 Filed 10-7-94; 8:45 am]
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