ML19211C460

Forwards Rept, Groundwater Monitoring Program Following Sealing of Settling Basins at Facility.

ML19211C460
Person / Time
Site:	Bailly
Issue date:	12/27/1979
From:	Bohn R NORTHERN INDIANA PUBLIC SERVICE CO.
To:	Ballard R Office of Nuclear Reactor Regulation
Shared Package
ML19211C461	List: ML19211C460 ML19211C466
References
NUDOCS 8001110432
Download: ML19211C460 (2)

Text

= r g Northern Indiana Public Service Company w Nuclear Staff RR 3, Box 501 Chesterton, IN 46304 December 27, 1979 BAILLY GENERATING STATION N-1 Mr. Ronald Ballard, Chief Environmental Projects Branch No. 1 Office of Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Washington, D.C. 20545 RE: NORTHERN INDIANA PUBLIC SERVICE COMPANY BAILLY GENERATING STATION NUCLEAR 1 DOCKET NO, 50-367

Dear Mr. Ballard:

Enclosed herewith are twenty-five (25) copies of a report titled " Groundwater Monitoring Program Following Sealing of Settling Basins at Bailly Generating Station", dated December 18, 1979. This report is submitted as a result of our commitment (see our let*er to you dated August 27, 1979) to provide a groundwater monitoring program sixty days in advance of commence-ment of construction to seal the ash settling basins. That construction is currently planned to begin in March 1980.

In the past, programs to determine the effects of construction dewatering ca the groundwater table and the criteria for the mitiga-tion of those effects have assumed seepage of considerable quantities of water from the existing ash ponds into the groundwater table on a continuous basis. However, in response to an expressed desire by the National Park Sarvice to allow the groundwater levela within the National Lakeshore to return to their natural levels, Northern Indiana Public Service Company (NIPSCO) undertook to seal the ponds.

The enclosed report describes the groundwater levels that can be anticipated after the groundwater mound created by the seepage is completely dissipated. This estimate is based in large part on the three-dimensional mathematical model of groundwater levels which was developed by the United States Geological Survey (USGS) for the National Park Service. Much of the data required for the development and " tuning" of this model was developed by NIPSCO and the USGS in a cooperative effort.

+32 1735 143 scouta  ::

Northerre Snestana PuhPlo Servloe Oorwspany e e Mr. Ronald Ballard, Chief December 27, 1979 Page Two As requested in your letter of November 21, 1979, we are also enclosing a preliminary drawing which gives tentative details con-cerning the method to be used for sealing the settling basins. As a courtesy and to assist your understanding, we shall furnish additional information when developed. If you have any specific questions, please let me know.

Sincerely, R. J. Bohn Manager, Nuclear Staff FUD/mlk Enclosures CC: National Park Service (w/ enclosure)

File: Docket File File: Indiana Dunes National Lakeshore 1735 144