ML19257D289
| ML19257D289 | |
| Person / Time | |
|---|---|
| Site: | Bailly |
| Issue date: | 11/21/1979 |
| From: | Ballard R Office of Nuclear Reactor Regulation |
| To: | Bohn R NORTHERN INDIANA PUBLIC SERVICE CO. |
| Shared Package | |
| ML19257D282 | List: |
| References | |
| NUDOCS 8002040031 | |
| Download: ML19257D289 (1) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION 7
W ASm NG TO N, D. C. 20555 k
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NOV 211979 Docket No. 50-367 0
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f:r. R. J. Bahn fianager, !!uclear Staff I:orthern Indiana Public Service company RR #3, Box 501 Chesterton, Indiana 46304 Cear fir. Bohn:
Ue have partially reviewed the report ("Succary Inforration, Hydrogeologic Evaluation of Construction Dewatering" uith Attachment A "Sumary Report.
Investigation and Testing for Groundenter Pressure Relief During Construc'fon")
submitted by letter dated August 27, 1979, in support of a proposed revision to i!IPSCO's devatoring plan.
Based on the infernation presented, we conclude that the proposed plan consti-tutes a reasonable approach to the deuatering problem; has little potential for adverse offsite effects to groundwater; and that the existing monitoring and aitigation progran can detect and interdict any adverse conditions before they affect offsite features (except as noted below).
He are continuing our review to include the portions of the report dealing with procedures for preventing and nitigating the effe' cts of boils should they o.ccu r.
This part of the work has teen included as a portion of the effort currently Leing undertaken in connection with the pile driving proposal under review. Thus, this portion of our review is not yet cceplete.
The effect of the ash pond scaling on groundwater levels and nonitoring has been considerrd by both of our staffs. However, while the ash pond seepage issue is not a direct Unit i problem, we should at least be aware of the sealing prograa you intend to implenent. Therefore, we request that we be provided a courtesy copy of any reports and plans for sealing the ponds which would naterially improve our understanding of the approach, procedures, inspection, and nooitoring to be used, and any potential impacts on the nonitoring and nitigation program.
1864 107 Sincerely, A
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Ronald L. Ballard, Chief
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Environnental Projects Branch 1 Division of Site Safety and Environct.ntal Anaiv31s 8 002 04 0 CD } [
PROPOSED C0!iSTRUCTION DEWATERIrlG MONITORIflG PROGRAM BY THE TIATIONAL PARK SERVICE, IfiDIAf1A DUNES flATIONAL LAKE SHORE The subject proposal was contained in a memorandum with several attached memoranda. The following comments cite the specific memorandum by date to which the comments apply.
Memorandum dated September 28, 1979, We question the recommendation by the flPS that flIPSCO advise them 30 days in advance of changes in dewatering pumping rates.
These pumping rates are dictated by vagaries of construction and weather.
It fs generally not feasible to schedule construction de-watering so far in advance.
However, NIPSCO snould be required to inform flPS of changes in pumping rates as soon as the changes are made or anticipated.
Memorandum dated September 4,1979, with attachment: The description of the observation well network and the USGS proposed monitoring program is based upon the assumptions that flIPSCO dewatering efforts will be directed only towards the unit I aquifer (for clarification " unit 1" in the reference document refers to the shallow aquifer).
Recent proposals by filPSCO, specifically those contained in their August 27, 1979 request make it clear that the dewaterfrg of the deeper aquifer will be necessary.
Same reference: The USGS proposed monitoring system is based principally on one well, designated USGS Well 25.
The proposal asserts that a method has been identified to reflect seasonal change in the overall monitoring control.
We question this assertion.
The U.S. Geological Survey, using the elevation of Well 25 at one day in history, modeled the overall shape and slope of the ground system (i.e., the reference water surface).
In our opinion not only the elevation but the shape of this water surface may vary seasonally. 110 wever,
the monitoring program assumes that the internal gradients, flow directions, etc., remain the same and only the elevation of the surface changes with the season.
This has not been documented and we would suggest that further re-finement may be needed in considering seasonal variations in groundwater elevations.
General comment: Although the program appears extensive and well-thought out, there appears also to be some redundency.
We suggest that the program be reviewed w1-h this in mind to assure that duplication is minimized.
1864 108 C *
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