ML20057E115
| ML20057E115 | |
| Person / Time | |
|---|---|
| Site: | 07000371, 070***** |
| Issue date: | 06/30/1993 |
| From: | Ansari A External (Affiliation Not Assigned) |
| To: | Roth J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 9310070303 | |
| Download: ML20057E115 (5) | |
Text
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L ORISE OAK BelDGE INST 11UTE M se SCE NCE AND F DUCATION va n mva,mut
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June 30,1993
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Mr. Jerome Roth Region I Nuclear Regulatory Commission 475 Allendale ' Road King of Prussia, PA 19406
SUBJECT:
ANALYSIS OF WATER AND SLUDGE SAMPLES, UNC NAVAL PRODUCTS AND CITY OF MONTVILLE WASTE WATER TREATMENT PLANT, MONTVILLE, CONNECTICUT
Dear Mr. Roth:
During the period May 17-21, 1993, the Environmental Survey and Site Assessment Program (ESSAP) of the Oak Ridge Institute for Science and Education (ORISE) performed a confirmatory survey of the outdoor areas at UNC Naval Products in Montville, Connecticut.
During that survey several water and sludge samples from the groundwater monitoring wells and the city of Montville Waste Water Treatment Plant (WWTP) and pumping stations were provided to ESSAP for analysis. The analysis of these samples has been completed and the following data (Figure 1, Tables 1, 2) are provided for your review. The following is a description of the samples and a summary of the results.
Groundwa.ler Monitorine Wells Water samples were collected from eleven monitoring wells. These wells were specified by the NRC (facsimile from J. Roth, NRC, to A. Ansari, ORISE,5/5/93). Per telephone conversation with Mr. Jack Parrott (5/19/93), well B5s was substituted for 101s. The location of each well is indicated in Figure 1. Per request from the NRC, water samples from each well were also shipped to the ESSAP contractor, Thermo Analytical Laboratory, Monrovia, California, for nitrate analysis. For these samples, a 48-hour maximum holding time (or, ice) was maintained.
A summary of results is provided in Table 1. The gross alpha and beta activity ranged from
< l.1 to 6.9 pCi/g and 2.7 to 17.6 pCi/g, respectively. The nitrate concentration in these samples ranged from <0.2 to 8.8 mg/1. Thr, U.S. Environmental Protection Agency (EPA)
Drinking Water Standard of 10 mg/l (40 CFR Parts 141 and 143) can be used for comparison.
City of Montville Waste Water Treatment Plant (WWTP)
Four samples were obtained at the WWTP facility on 5/19/93. The samples were collected by WWTP, Three samples (the influent, effluent, and 2-4% solid) were analyzed for gross alpha and beta activity in a low-background gas proportional detector. One sample (filtered cake) was dried and analyzed by gamma spectrometry.
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Holly Hill and Avery Hill Pumnine Stations Three samples were provided to ESSAP by Babcock and Wilcox (B&W), a contractor for UNC.
These samples had been collected at the Holly Hill pumping station. The total uranium concentrations in these samples ranged from 10 to 250 pCi/g. The Holly Hill pumping station was resampled by 'UNC on 5/20/93. The sample was provided to ESSAP for analysis. The total uranium concentration in that sample was 170 pCi/g. For samples from the Holly Hill i
pumping station the U-234:U-235 activity ratio, as determined by alpha spectrometry, averaged 37 to 1.
The total uranium concentration in the sample from Avery Hill pumping station was 19 pCi/g, based on U-234:U-235 activity ration of 41 to 1 which has been typically used at UNC. The U-234:U-235 activity ratio in this particular sample, as determined by alpha spectrometry, was 32 to 1.
If there are any questions regarding this information, please direct them to me at (615)576-3355 or Michele Landis at (615)576-2908.
Sincerely s
Armin J.
sari Project Leader
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TABLE 1
SUMMARY
OF GROSS ALPIIA AND BETA ACTIVITY AND NITRATE CONCENTRATIONS IN GROUND WATER MONITORING WELLS UNITED NUCLEAR CORPORATION NAVAL PRODUCTS MONTVILLE, CONNECTICUT Nitrate Location' Alpha Activity Beta Activity Concentration 6
pCi/L pCi/L mg/L B-120d
< 1.3 9.9 1.4*
8.8 T-lb
< 1.2 6.3 i 1.3 0.9 LF-2d
< 1.2 11.9 i 1.4 4.6 LF-WT 2.1 0.8' 8.5 i 1.3 3.2 BG-1
< 1.1 2.7 i 1.1 1.1 B-110s 2.6 i 0.9 5.3 i 1.2 1.1 B-3d
< 6.9 17.6 i 5.9 1.0 T-10 6.9 1.2 12.6 1.4 3.0 B-2
< 1.2 8.2 i 1.3 4.8 B-62
< 1.3 8.7 i 1.4
< 0.2 B-5s
< 1.1 3.4 1.1 2.2 Refer to Figure 1.
6 Nitrate analysis performed by Thermo Analytical, Inc., Monrovia, CA.
- Uncertainties represent the 95% confidence level, based only on counting statistics.
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TABLE 2
SUMMARY
OF RESULTS FROM SLUDGE AND WASTE WATER SAMPLES MONTEVILLE WASTE WATER TREATMENT PLANT AND PUMPING STATIONS MONTEVILLE, CONNECTICUT Activity (pCi/Lp Uranium Concentration (pCilg) h
. Sample
% Water Content U-235 Total Location / description Alpha Beta U-238 Uranium
- Waste Water Treatment Plant' Influent grab sample
>99
< l.4 14.8 1.6' Effluent grab sample
>99
< l.4 14.3 1.6 2-4% solid 8 95
< 3.4 118.2 i 5.8 Filtered Cake 86 0.5 i 0.3*
4.2 i 3.3*
25 Pumping Stations Holly Hill # 25236" 5.7 0.4 6.9 1.9 250 Holly Hill # 25237h 0.1 i 0.8 13.2 6.3 17 Holly Hill # 25238h 0.2 0.2 1.8 i 2.0 10 Holly Hilli 78 4.1 0.3 6.4 i 1.8 170 Avery Hill 49 0.4 0.1 1.7 i 0.9 19 i
Results obtained from low background gas proportional detector 6Results obtained from gamma spectrometry
dSamples provided by Waste Treatment Plant Staff on May 19, 1993.
' Uncertainties represent the 95% confidence level, based only on counting statistics.
' Analysis not performed
'The insoluble fraction of this sample was analyzed by alpha spectrometry. The concentrations of U-234, U-235, and U-238 were 4.3,0.1, and 2.9 pCi/g, respectively.
hSamples provided by Babcock and Wilcox (B&W) for confirmatory analysis. The identification numbers are B&W's.
iSamples provided by United Nuclear Corporation t
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