ML20056H456
| ML20056H456 | |
| Person / Time | |
|---|---|
| Site: | Wood River Junction |
| Issue date: | 07/19/1993 |
| From: | Bradley M RHODE ISLAND, STATE OF |
| To: | Gregg R UNITED NUCLEAR CORP. (SUBS. OF UNC, INC.) |
| References | |
| NUDOCS 9309090362 | |
| Download: ML20056H456 (2) | |
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%d 7o-D o Department of Environtnent.d Manacement 1)li'ISION Ol' GROUNDWATI ANDISDS GIU)lINDWATER SECTION
.o1It.w naarstnti iw i l w c !< 1 U.%s r,7G7 ilfil);'E JTM July 19, 1993 Robert J.
Gregg UNC Naval Products 67 Sandy Desert Road P.O.
Box 981 Uncasville, CT 06382-0981
Dear Mr. Gregg:
o n?
Thank you for your submittal of the April 16, 1992) report entitled " Groundwater Monitoring Plan: UNC Site, Charle'stown, Rhode Island".
From a technical standpoint it substantially satisfies the criteria for a nonitoring plan acceptable to RIDEM, with two exceptions.
RIDEM's comments on these deficiencies are outlined below:
1 (1)
Cessation of groundwater quality monitoring.
Consistent with previous discussions between RIDEM and UNC, sampling / testing for nitrates will continue for at least five years, at which time RIDEM will reassess the program.
Monitoring is likely to continue beyond five years for any parameters above the drinking water standards.
(2)
Sampling / testing for Strontium-90 and gross beta.
Monitoring for Sr90 and gross beta shall be performed annually.
Although the proposed MCL for Sr90 is 42 pCi/1, the presently enforceable limit is 8 pCi/1.
The latest available data
)
(November 1990) shows both Sr90 and gross beta to be above these limits in some wells.
It is because of this and the possiblity of additional spikes in the data that RIDEM is requiring continued monitoring for Sr90 and gross beta.
If warranted by i
the test results, RIDEM will reassess the need for continued Sr90 and gross beta testing before the end of five years.
As discussed in previous meetings, the groundwater monitoring plan should reflect that UNC shall inform RIDEM of sampling dates at least two days before sampling, and testing results shall be submitted to RIDEM within 45 days of the sampling date.
To finalize this matter, RIDEM would expect the monitoring 1
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I program to be referenced in a consent agreement between UNC and RIDEM.
As mentioned in previous meetings, the next step upon resolution of technical issues is to address the framework within which such work would be carried out.
It has been the i
understanding of our office that a written agreement such as a consent agreement would be the likely outcome.
Please let us know if you think a meeting would be helpful in flushing out additional concerns on these points.
Sincerely, l
Vi b.S 0"U'l j
Margaret Dein Bradley Hydrogeologist cc.
S.
Kiernan R.
Chateauneuf C.
Cote C.
Weymouth a
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