Results of the Separations Area ground-water monitoring network for 1982

Technical Report · Fri Jul 01 00:00:00 EDT 1983

OSTI ID:5796732

Wilbur, J S; Graham, M J; Lu, A H

There were 107 wells in the 1982 Separations Area monitoring network. An additional network of wells in which water levels were measured was maintained in 1982. A calibrated ground-water flow model, generated for the Separations Area using water-level measurements, was used to predict water-level impacts of projected PUREX-related discharges on the unconfined aquifer. Water samples were collected monthly, quarterly, or semiannually from monitoring wells. During 1982, the ground-water monitoring schedule was updated to provide ground-water quality information prior to and after PUREX restart. An evaluation of 1982 monitoring data indicates few changes from 1981. In 1982, tritium analyses exceeded 300 pCi/mL (10% of Table II, DOE Order 5980.1, Chapter XI) in wells monitoring three active disposal sites. No other radionuclide contamination from active sites exceeded 10% of Table II guidelines. Nitrate results exceeded 45 mg/L (Environmental Protection Agency drinking water standards) in monitoring wells at two active sites. With the exception of tritium, radioactive contamination that exceeded 10% of Table II guidelines in 1982 was the result of inactive waste disposal operations. Average /sup 90/Sr concentrations in monitoring wells around the 216-B-5 Reverse Well and 216-S-1 and S-2 Crib exceeded 0.03 pCi/mL, 10% of Table II, with the highest concentration equal to 9.45 pCi/mL. Average /sup 137/Cs concentrations in monitoring wells near the 216-B-5 Reverse Well and 241-BX-102 Tank exceeded 0.2 pCi/mL, 10% of Table II, with a high of 3.61 pCi/mL. These zones of contamination appear to be localized near these inactive sites. Analysis of contamination plumes within the Separatioins Area indicated that contamination levels in ground water migrating out of the Separations Area at this time are less than DOE Table II guidelines.

• Research Organization: Rockwell International Corp., Richland, WA (USA). Energy Systems Group
• DOE Contract Number: AC06-77RL01030
• OSTI ID: 5796732
• Report Number(s): RHO-RE-SR-83-24P; ON: DE84000533
• Resource Relation: Other Information: Portions are illegible in microfiche products
• Country of Publication: United States
• Language: English

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