Results of Tritium Tracking and Groundwater Monitoring at the Hanford Site 200 Area State Approved Land Disposal SiteFiscal Year 2003 Page: 4 of 43
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The Hanford Site 200 Area Effluent Treatment Facility (ETF) processes contaminated aqueous
wastes derived from Hanford Site facilities. The treated wastewater occasionally contains tritium, which
is not removed by the ETF, and is discharged to the 200 Area State-Approved Land Disposal Site
(SALDS). During fiscal year (FY) 2003 to date (through August 31, 2003), approximately 96-million
liters (25.3-million gallons) of water have been discharged to the SALDS.
Groundwater monitoring for tritium and other constituents, and water-level measurements are
required by the state-issued permit at the SALDS. The current network consists of 3 proximal monitoring
wells and 16 tritium-tracking wells. Proximal wells were sampled in October 2002, and January,
February, April, and September of 2003. Tritium-tracking wells were sampled in January and September
of 2003, but September results were delayed because of fire hazards near the wellheads. Water-level
measurements in three wells nearest the SALDS indicate the continuation of a small hydraulic mound
beneath the SALDS facility as a result of discharges. This feature is directing groundwater flow radially
outward a short distance before the regional northeasterly flow predominates. This condition also places
several wells south of the SALDS hydraulically downgradient of the facility. Some of the wells south of
the SALDS in the tritium-tracking network have dried or are projected to soon be dry. Well 299-W7-6
went dry during FY 2003, preventing collection of the September sample from this well. Likewise,
difficulties in obtaining a sample from well 299-W7-9 suggest that this well may have produced its final
sample in January 2003. So far, the tritium-tracking network remains adequate to track effluent from the
SALDS, but the loss of these wells could affect numerical modeling results.
Average tritium activities decreased in all three SALDS proximal wells during FY 2003, compared
with FY 2002. Sporadic detections in well 299-W7-5 suggest that tritium from SALDS may be reaching
the northern edge of the 200-West Area (due south of the facility), or that this well is peripherally
influenced by the tritium plume from the 200-West Area. Maximum FY 2003 tritium activities for
SALDS proximal wells were 189,000 pCi/L in well 699-48-77A, (February 2003), 430,000 pCi/L in well
699-48-77C (October 2002), and 220,000 pCi/L in well 699-48-77D (October 2002).
Concentrations of all chemical constituents with permit limits were well within those limits during all
of FY 2003. Acetone, benzene, tetrahydrofuran, cadmium, chloroform, lead, and mercury were below
method detection limits in all samples. Concentrations of major cations and anions are mostly below
background concentrations due to dilution by the clean water discharged to the SALDS.
Comparison of head distribution in March 2003 and reported FY 2003 tritium activities, with
numerical predictions of these quantities for 2000 and 2005, suggests that modeling performed in 1997
only slightly overestimated the areal spread of tritium around the SALDS to date. Contouring of March
2003 groundwater flow potential near the SALDS (but away from the mound) appears to show a more
easterly component compared with both 2000 and 2005 model times and the FY 2002 potential map.
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Barnett, D. Brent; Rieger, JoAnne T. & Thornton, Edward C. Results of Tritium Tracking and Groundwater Monitoring at the Hanford Site 200 Area State Approved Land Disposal SiteFiscal Year 2003, report, November 30, 2003; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc877360/m1/4/: accessed December 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.