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Department of Energy
Washington, DC 20585
March 17,2016
Mrs. Clayton Reed Young

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Subject: Monticello Mill Tailings Site (MMTS), Monticello, Utah: Water Quality Results for
Sorenson (Surface Water) and Well 95-03 (Groundwater) Locations, October 2015
Mrs. Young:
As requested, this letter provides analytical results for one surface water sample and one
groundwater sample collected from locations on your property by the U.S. Department of Energy
Office of Legacy Management (DOE-LM) in October 2015. The samples were analyzed for
chemical constituents that may have derived from past operation of the former Monticello mill.
Restoration of water quality that was impacted by the mill 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. A map showing OU III
groundwater and surface water monitoring locations is enclosed with this letter. The referenced
sampling locations on your property are highlighted in yellow on the map.
The surface water sample was collected from Montezuma Creek at the location known as
Sorenson, where sample collection is conducted twice yearly in April and October. The water
quality results presented in Table 1 for October 2015 indicate that selenium and uranium
exceeded the respective water quality protection standards. These results are consistent with
historical measurements at that location, and are interpreted to have occurred due to the
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, October 2015
Contaminant of Concern Water Quality Protection
Standard (ng/L)1 October 2015 Result (jjg/L)
Arsenic 10 2.9
Nitrate (as nitrogen)4,000 80
Selenium 5.2
Uranium 44 120
1 One microgram per liter (|jg/L) is equivalent to one part contaminant per billion parts water (the mass of one liter of
water is one billion micrograms).
A groundwater sample is collected during October each year from one monitoring well located
on your property (well 95-03). Water quality results for October 2015 are presented in Table 2.
The results indicate that there are no contaminants of concern related to the former Monticello
mill that are elevated with respect to the corresponding water quality protection standard. This is
consistent with historical monitoring results for that location.
SCANNED
nFRR -2Df(f-
Mrs. Clayton Reed Young -2-March 17, 2016
Table 2. Contaminants of Concern and Groundwater Result: Well 95-03, October 2015
Contaminant of Concern Water Quality Protection
Standard (yg/L)1 October 2015 Result (jjg/L)
Arsenic 10 0.18
Manganese 880 380
Molybdenum 100 4.2
Nitrate (as nitrogen)10,000 <10 (not detected)
Selenium 50 <0.32 (not detected)
Uranium 30 8.2
Vanadium 330 <0.15 (not detected)
1 One microgram per liter (|jg/L) is equivalent to one part contaminant per billion parts water (the mass of one liter of
water is one billion micrograms).
The most recent summary of water quality at MMTS (Monticello Mill Tailings Site Operable
Unit III Annual Groundwater Report May 2014 Through April 2015) provides additional
information related to OU III remedial actions and water quality monitoring. The report is
available upon request or, if you have Internet access, on the LM public website at
http://www.lm.doe.gov/Monticello/Documents.aspx.
Please call me at [phone] if you have any questions. Also, please let me know if you are
no longer interested in receiving future data. Please address any correspondence to:
U.S. Department of Energy
Office of Legacy Management
2597 Legacy Way
Grand Junction, CO 81503
Sincerely,
V? 4\
son Nguyen
Site Manager
Enclosure
cc w/enclosure:
M. Storck, UDEQ
V. Moritz, EPA
A. Gil, DOE-LM (e)
T. Bartlett, Navarro (e)
A. Houska, Navarro (e)
K. Karp, Navarro (e)
J. Miller, Navarro (e)
File: MNT 0402.02 (rc-grand.junction)
Sites\Monticello\3-15-16 MNT 2015 Water Quality Results (Young).docx
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