RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY at the Hanford Site Page: 4 of 99
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Summary
A groundwater quality assessment plan was prepared to investigate the rate and extent of aquifer
contamination beneath Waste Management Area TX-TY. This area contains the 241-TX and 241-TY
Tank Farms and is located in the northern portion of the 200 West Area of the Hanford Site in south-
eastern Washington State. The first determination failed to find an upgradient source for the groundwater
contamination observed at Waste Management Area TX-TY; therefore, a continued assessment is
required. The plan described here implements the Resource Conservation and Recovery Act requirement
stated in 40 CFR 265.93(d)(7). This plan is an update of a draft plan issued in February 1999, which
guided work performed in fiscal year 2000. Planned activities for fiscal year 2001 and beyond include
additional groundwater sampling and analysis, hydraulic testing to further define flow rate and direction,
and installation of additional wells to improve the detection monitoring network and to better define the
areal and vertical extent of contamination. Five new downgradient wells to enhance spatial coverage will
be completed during calendar year 2000. Nine new wells (subject to funding) are planned for calendar
year 2001 to further define areal and vertical extent and to help distinguish tank leak sources from
upgradient crib sources.
The groundwater quality assessment will provide input to a Resource Conservation and Recovery Act
Facility Investigation Corrective Measures Study (RFI/CMS) conducted by the River Protection Program
to investigate the vadose zone sources of observed groundwater contamination beneath Waste Manage-
ment Area TX-TY. The groundwater quality assessment and the RFI/CMS work will be conducted under
separate but coordinated plans. Results from the groundwater investigation together with the RFI/CMS
results will provide information to support decisions on interim measures, corrective measures, waste
retrieval, and eventual closure of the tank farms.iii
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Hodges, Floyd N. & Chou, Charissa J. RCRA Assessment Plan for Single-Shell Tank Waste Management Area TX-TY at the Hanford Site, report, February 23, 2001; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc934529/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.