DERR-2015-011264 - 0901a0688055975f

Department of Energy
Washington, DC 20585
August 11, 2015 m ,g2ci5
Mr. Clayton Reed Young

Subject: Monticello Mill Tailings Site (MMTS), Monticello, Utah: Results of Surface Water
Quality Analysis for April 2015, Sorenson Location
Dear Mr. Young:
By your request, this letter provides analytical results for specific contaminants in the surface
water sample that was collected from your property by the U.S. Department of Energy Office of
Legacy Management (DOE-LM) in April 2015. The sample was collected to evaluate the impact
of the operation of the former Monticello mill on water quality. Water quality restoration is
being addressed by DOE-LM as Operable Unit (OU) III of the MMTS, in coordination with the
U.S. Environmental Protection Agency and the State of Utah Department of Environmental
Quality.
The surface water sampling site on your property is known as the Sorenson location. A water
sample is collected at that location from Montezuma Creek twice yearly, typically in April and
October. Neither of the monitoring wells that are located on your property (wells 95-03 and
95-04) was sampled in April 2015, in accordance with the current monitoring schedule. A map
showing the OU III groundwater and surface water monitoring locations is enclosed.
Table 1 presents the April 2015 contaminants of concern results for the Sorenson location.
These results indicate that selenium and uranium exceeded the respective water quality
protection standard at concentrations that are consistent with historical results. Selenium and
uranium contamination in Montezuma Creek at this location occurs from the local discharge of
contaminated groundwater to the creek. There are no regulatory or administrative restrictions
that affect the use of water in Montezuma Creek at present concentrations.
Table 1. Contaminants of Concern and Surface Water Result; Sorenson Location, April 2015
Contaminant of Concern Water Quality Protection
Standard (pg/L)1 April 2015 Result (pg/L)
Arsenic 10 0.31
Nitrate (as nitrogen) 4,000 10
Selenium 7.2
Uranium 44 170
One microgram per liter (pg/L) is equivalent to one part contaminant per billion parts water (the mass of one liter of
water is one billion micrograms).
SCANNED
®
Mr. Clayton Reed Young -2-August 11,2015
The most recent annual groundwater report (Monticello Mill Tailings Site Operable Unit III
Annual Groundwater Report May 2013 Through April 2014) provides additional information
related to OU III remedial actions and water quality monitoring. The report is available upon
request or by Internet access at httpV/ww^w.lm.doe.gov/Monticello/Documents.aspx.
Please call me at [phone] if you have any questions. Please address any correspondence
to:
U.S. Department of Energy
Office of Legacy Management
2597 Legacy Way
Grand Junction, CO 81503
Enclosure
cc w/enclosure:
V. Moritz, EPA
M. Storck, UDEQ
A. Gil, DOE-LM (e)
T. Bartlett, SN3 (e)
A. Houska, SN3 (e)
J. Miller, SN3 (e)
File: MNT 0402.02 (rc grand junction)
Jgfeon Nguyen1
Site Manager
Sites\Monticello\8-'M5'MNT Water Quality TesHlesults Apr2OT5 (YomTg).docx
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