DRC-2025-001830

EnergySolutions' 2024 Annual Meteorological Report.
Utah Department of Environmental Quality
DIVISION OF WASTE MANAGEMENT AND RADIATION CONTROL
EnergySolutions' 2024 Clive Facility Meteorological Report
Ground Water Quality Discharge Permit, No. UGW450005
Groundwater Module 9 Inspection
INSPECTION REPORT FOR:
EnergySolutions, LLC
299 South Main Street, Suite 1700
Salt Lake City, UT 84111
[phone]
DATE OF INSPECTION:
Submitted February 24, 2025; DRC-2025-000649 (Trinity Consultants)
FACILITY ADDRESS:
EnergySolutions LLC
Clive Disposal Site
Interstate 80, Exit 49
Clive, UT 84029
The EnergySolutions LLC's (EnergySolutions) Clive site is located in Tooele County, Utah,
approximately 2.5 miles south oflnterstate 80, 75 miles west of Salt Lake City, and 55 miles east
of Wendover Utah. The facility occupies all of Section 32 and parts of Sections 29 and 33 of
Township 1 South, Range 11 West Salt Lake Base and Meridian (SLBM), and part of Sections 5,
Township 2 South, Range 11 West SLBM.
FACILITY CONTACT:
Vern C. Rogers
Director, Regulatory Affairs
[phone]
Mathew Schon
Manager, Groundwater and Environmental Program
[phone]
REVIEW of REPORT PREPARED BY:
Andrew Zehr, Hydrogeologist
LLRW Section, Utah Division of Waste Management and Radiation Control
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EnergySo/utions' 2024 Annual Meteorological Report.
APPLICABLE REQUIREMENTS:
The State of Utah, as an U.S. Nuclear Regulatory Commission (NRC) Agreement State, has
developed and adopted compatible requirements to the NRC and has regulatory authority for the
disposal of Low Level, Mixed, and 1 le.(2) byproduct radioactive waste materials. Applicable
requirements are found in Title 10 Code of Federal Regulation (CFR) Part 61, and Utah Statute
Utah Administrative Code (Utah Admin. Code) R-313-24 and 25, Uranium Mills and Source
Material Mill Tailings Disposal Facility Requirements, and License Requirements for Land
Disposal of Radioactive Waste, respectively. The State of Utah has issued two Radioactive
Material Licenses, UT2300249 and UT2300478, to the EnergySolutions Clive site. Additionally,
because the Clive site has been determined to have the potential to pollute groundwater it also
falls under the Utah Administrative Rules for Water Quality. Provisions and requirements for
groundwater quality protection are found in Utah Admin. Code R317-6, Utah Administrative
Rules for Ground Water Quality Protection. The State of Utah has issued a Ground Water
Quality Discharge Permit, No. UGW450005, for the EnergySolutions Clive site.
In accordance with the requirements of Utah's Rules for Ground Water Quality Protection Utah
Admin. Code R317-6-6, and under the terms of the Ground Water Quality Discharge Permit No.
UGW450005 (herein 'the Permit') Part l.F.11, Part l.H.10, and Appendix G, continuous
monitoring of meteorological parameters at the Clive site and the submittal of this report is
required.
• TYPE OF INSPECTION:
The Groundwater Module 9 inspection is a review of the Annual Meteorological Monitoring
Report prepared by Trinity Consults for EnergySo/utions. The report summarizes the
meteorological conditions observed at the Energy Solutions Clive site from January through
December 2024 and the 32-year history from January 1993 through December 2024.
FACILITY DESCRIPTION:
Energy Solutions is a Utah-based company that owns and operates a commercial Class A, low
level radioactive waste (LLRW), 1 le.(2) byproduct (uranium mill tailings), and a mixed
radioactive and hazardous (Mixed) waste disposal site near Clive, Tooele County, Utah.
EnergySo/utions (formerly Envirocare of Utah, Inc.) began waste disposal operation at the Clive
site in 1988 on Section 32. Presently, waste treatment and disposal occurs in Section 32
(approximately one square mile, less the US Department of Energy (DOE) Vitro property), with
handling, rail operations, cleaning, maintenance, and administration also taking place in the rest
of Section 32 and in parts of Section 29. Clay mining occurs in Section 29 and Section 5. The
whole operation covers about two square miles. There are three active above-ground engineered
disposal embankments: the Class A West, Mixed, and 1 le.(2) waste embankments. There are
two closed embankments: the LARW embankment (closed in 2006 by EnergySolutions), and the
DOE's Vitro mill tailings embankment (closed in 1988 by the DOE). Currently, the site has about
100 employees and typically operates a single, ten-hour shift, four days a week.
The Clive site is west of the Cedar Mountains and at the eastern margin of the Great Salt Lake
Desert. Surface water from the Cedar Mountains does not normally reach the site and any natural
drainage in the area collects in the Great Salt Lake playa several miles to the west. The Clive
site is situated on Quaternary-age sediments, predominantly interbedded silt, clay, and sand with
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EnergySolutions' 2024 Annual Meteorological Report.
occasional gravel lenses, associated with an ancient lake. The average elevation of the site is
4,270 feet above mean sea level. Topography in the Clive area natural slopes slightly toward the
southwest with approximately 10 feet of relief within Section 32. The area has a semi-arid
climate with an average precipitation of about 9 inches per year, and an average pan evaporation
of about 50 inches per year. The general climate of the area is a product of its elevation, relative
location to the average storm track, distance from moisture sources, and large mountain barriers
(the Sierra Nevada Range along the California-Nevada border is a significant barrier to storm
systems from the Pacific Ocean into the western United States). The area is characterized by cold
winters, warm to hot summers, with large temperature extremes. Air masses moving through the
region are generally maritime polar, with occasional maritime tropical in fall and early wintei:.
The meteorological monitoring station at the Clive site is equipped to measure horizontal wind
speed, wind direction, 2-and 10-meter temperatures, solar radiation, precipitation, and
evaporation.
CREDENTIALS, PURPOSE AND SCOPE:
Current meteorological conditions constitute a significant influence on the efficiency of site
activities and daily operations; the Clive site is required to continuously monitor weather
conditions to minimize and prevent waste handling under conditions that could potentially
disperse contamination or create airborne radioactivity hazards. Additionally, continuous
monitoring is required to demonstrate meteorological assumptions used in infiltration and
unsaturated zone modeling for the design of the embankments are representative of the actual
conditions at the Clive site.
MANAGEMENT ACTIVITIES:
Energy Solutions' Clive Site is permitted, licensed, and authorized to receive and dispose of Class
A LLRW, NORM/NARM waste, Class A Mixed LLRW, 1 le.(2) Byproduct Material, and
Special Nuclear Material based on concentration limits. Waste is received at the Clive Site as
bulk, containerized, or enclosed waste shipped by trucks or rail. The waste disposal
embankments occupy part of Section 32, with the remainder of Section 32 being occupied by
rail, unloading, and cleaning facilities. Additional waste handling, rail operations, administrative,
and maintenance occurs in Section 29. Raw material (Clay) mining occurs in Section 29 and has
occurred in Section 5. Waste treatment is not allowed at the Class A West or the 1 le.(2)
embankments. Treatment facilities are located within the Mixed Waste area. Treatment facilities
for radioactive waste that requires treatment for RCRA constituents and for liquid radioactive
wastes requiring solidification prior to disposal are available.
EnergySolutions has operated the meteorological monitoring station at Clive since April 1992.
The meteorological monitoring station collects on-site meteorological data for use in on-site
operations and to satisfy conditions of the Permit. Meteorological measurements are made every
10 seconds and are stored by a data logger. Averages are computed by the data logger and
recorded every hour. The data logger also computes hourly wind direction and fluctuations per
United States Environmental Protection Agency (USEPA) guidelines. Two temperature sensors
are used to derive stability class at the Clive site. Data from the data logger is downloaded by
EnergySolutions on a weekly basis and a certified consulting meteorologist at Trinity
Consultants performs weekly reviews of all meteorological data. Calibration verification checks
are performed every six months in accordance with EP A's Quality Assurance Handbook for Air
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EnergySolutions' 2024 Annual Meteorological Report.
Pollution Measurement Systems, Vol. IV: Meteorological Measurements, March 2008 and EP A's
Ambient Monitoring Guidelines for Prevention of Significant Deterioration, May 1987.
NARRATIVE:
The 2024 Trinity Consultants report provides monitoring data from the January through
December 2024 meteorological year for the following parameters in accordance with the
approved Weather Station Monitoring Plan found in Appendix G (Weather Station Monitoring
Plan) of the Permit:
• Pan Evaporation, hourly with daily totals
• Solar radiation, hourly
• Precipitation, hourly with daily totals
• Temperature at 2 and 10 meters above ground level (agl.), hourly.
• Wind speed and direction, hourly
All the above meteorological parameters were monitored from January 1, 2024, through
December 31, 2024, apart from pan evaporation where measurements were recorded from April
23, 2024, to October 15, 2024, when ambient air temperatures remained above freezing.
Approximately 99.9 percent of the meteorological data was recovered for the period of January
through December 2024.
2024 METEOROLOGICAL DATA
Systematic weather observations have been made at the Clive site since 1993, and these
observations have been summarized in yearly reports. The weather observation data from
January through December 2024, data recovery for that period, and comparison of the data are
reviewed here. The annual, day-to-day, and extremes of weather are all important in determining
how embankments are designed, managed, and operated.
Wind Speed and Horizontal Wind Direction
Winds monitored at the Clive site are surface winds which are controlled in a large part by
topography and not related to synoptic winds, which control storm movements. Reported wind
directions represent the directions from which the wind is blowing. For the 12-month period, the
highest percentage of winds were found in the south-southwest (12.6%), with the second most
frequent sector being the east-northeast (11.9%).
For Quarter 1 (QI), 2024, the south-southwest sector was the most prominent at 16.2%. East-
northeast winds were the most prominent during Quarter 2 (Q2), 2024 at 12.1 %. For Quarter 3
(Q3), 2024, east-northeast winds were the most prominent at 11.9%. East-northeast winds were
the most prominent during Quarter 4 (Q4), 2024 at 13.1 %. During QI 2024, winds from the
south sector contained the highest average wind speeds at 4.7 meters/second (10.5 miles/hour).
For Q2, the highest average wind speed was 4.7 mis (10.5 mph) from the south and north-
northwest sectors. The south sector had the highest average wind speed in Q3 at 5.2 mis (11.6
mph). For Q4, the north-northwest sector contained the highest average wind speeds at 4.3 mis
(9.6 mph).
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Energy Solutions' 2024 Annual Meteorological Report.
Winds during the 2024 meteorological year were calm 1.2% of the time ( calms defined as wind
speeds less than 0.5 mis or 1.12 mph) and had an annual average windspeed of3.2 mis or 7.2
mph overall. Wind speeds greater than 10.8 mis (24 mph) were reported 0.9 percent of the time.
The highest wind speed measured was 15.1 mis (33.8 mph), which occurred on March 2, 2024,
at 10:00.
Temperature
The averages, as well as the daily and seasonal variations of temperature are primarily controlled
by solar radiation, and the influence of land features. Ambient daily average temperatures
ranged from a low of-8.6°C on January 16 to a high of31.3°C on July 13, 2024. The hourly
minimum temperature was -14.8°C on January 16 at 04:00 and the hourly maximum temperature
was 40.3° Con July 11, 2024, at 17:00. The average monthly temperature from January to
December 2024 was 11. 7°C. 2024 was significantly warmer than average, with an annual
average temperature of 11. 7°C compared to the previous eight-year average of 10.8°C (Table I,
end of section).
Pan Evaporation
Pan evaporation measurements were made from April 23 through October 15, 2024 (the Permit
requires EnergySolutions to start on May 1 and end on October 1), when ambient air temperature
is generally above freezing. The total pan evaporation from April 23 to October 15 was
approximately 1293.8 millimeters (50.94 inches) at Clive with the highest pan evaporation
occurring in July (see Table 2). The evaporation pan gauge was evaluated on 2 visits, which
occurred on April 23, 2024, and October 15, 2024. The results of the evaluations conducted on
these days verified the gauge was working properly and was within the EPA's recommended
tolerance during both visits.
Table 2. 2022 through 2024 Clive Monthly Total Pan Evaporation Comparisons.
2022 Average 2023 Average 2024 Average
Month Pan Pan Pan
Evaporation(!) Evaporation2l EvaporationC3)
(inches) (inches) (inches)
April 2.65 3.55 1.45
May 7.34 7.46 7.33
June 11.03 8.25 10.97
July 13.65 12.13 11.87
August 8.38 9.09 10.29
September 7.54 6.34 6.76
October 2.57 1.65 2.27
Approximate Annual Pan 53.16 48.47 50.94 Evaporation
1. measurement began on April 18 and ended on October 20, 2022
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EnergySolutions' 2024 Annual Meteorological Report.
2. measurement began on April 14 and ended on October 17, 2023
3. measurement began on April 23 and ended on October 15, 2024
Precipitation
The total precipitation at the site for the period January 2024 through December 2024 was 7.29
inches (185.17 mm). Precipitation data for the Clive site show that for the current year (2024),
precipitation totals were below average. The month with the greatest total of precipitation
recorded at Clive was March 2024 when a total of 42.16 mm (1.66 inches) fell.
The day which recorded the greatest amount of precipitation was April 27, 2024, when 18.03
mm (0.71 inches) fell. The greatest amount of precipitation during any one hour was on August
17, 2024, at 21:00 when 12.70 mm (0.50 inches) fell.
Table 3. 2021 through 2024 Clive Monthly Precipitation Total Comparisons
2021 Monthly 2022 Monthly 2023 Monthly 2024 Monthly
Month Precipitation Precipitation Precipitation Precipitation Totals
(inches) Totals (inches) Totals (inches) Totals (inches)
January 1.08 0 2.48 0.49
February 0.62 0.1 0.53 1.45
March 1.01 1.13 2.12 1.66
April 0.99 0.39 0.34 1.48
May 0.08 0.93 0.43 0.35
June 0.15 0.18 1.27 0.02
July 0.4 0 0.13 0.08
August 1.75 0.5 0.66 0.68
September 0 0.87 0.9 0.08
October 2.2 0.13 1.42 0.32
November 0.11 0.66 0.8 0.43
December 0.84 0.91 0.16 0.25
Annual Total 9.23 5.81 11.24 7.29 Precipitation
Solar Radiation
Radiation emitted from the sun (solar radiation) is a major source of energy that drives processes
occurring at or near the earth surface, i.e. solar radiation directly affects the air temperature and
soil surface temperature; winds are produced by the uneven distribution of solar radiation; and
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EnergySo/utions' 2024 Annual Meteorological Report.
evaporation rates increase as more solar radiation reaches the surface. Because the earth is
rotating on an inclined axis as it revolves around the sun, and there are irregularities in
atmosphere conditions, particularly clouds and humidity, solar radiation varies seasonally.
The highest measurements of solar radiation at Clive were recorded from May through August of
2024; the highest monthly mean was recorded in July at 509 W/m2 and the highest hourly
maximum was recorded in May at 1089 W /m2. The lowest measurements of solar radiation
occurred in January and December, with a monthly mean of 197 W/m2 and an hourly maximum
of 582 W/m2
, and a monthly mean of 192 W /m2 and an hourly maximum of 4 77 W/m2
,
respectively. Solar radiation during the 2024 meteorological year seems to be generally
consistent in comparison with the monthly mean solar radiation measurements in the last four
years (Table 4).
Table 4. 2021 through 2024 Clive Average Hourly Maximum Solar Radiation Comparison by
Month
2021 Average 2022 Average 2023 Average 2024 Average
Month Solar Radiation Solar Radiation Solar Radiation Solar Radiation
(W/m2) (W/m2) (W/m2) (W/m2)
January 220 236 191 197
February 274 297 293 249
March 379 378 322 338
April 455 413 410 424
May 517 479 469 497
June 501 495 468 499
July 458 468 497 509
August 444 426 448 462
September 430 434 412 433
October 284 367 344 349
November 234 237 228 245
December 187 161 192 192
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EnergySolutions' 2024 Annual Meteorological Report.
Table 1. 2016 through 2024 Clive Monthly Average Temperature Comparisons
2016 2017 2018 2019 2020 2021 2022 Average 2023 Average 2024
Average Average Average Average Average Average Average
Month Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly Monthly
Temperature Temperature Temperature Temperature Temperature Temperature Temperature Temperature Temperature
(OC) (OC) (OC) (OC) (OC) (OC) (OC) (OC) (OC)
January -2.6 -5.9 -0.4 -2.6 -0.1 -1.9 -2.5 -3.1 -1.3
February 1.4 2.8 0.4 0.6 -0.5 1.6 2.2 -4.4 2.8
March 6.7 8.1 4.6 4.5 6.1 4.4 5.8 2.2 5.2
April 10.7 8.6 10.5 10.3 9.9 8.7 8.2 8.5 10.1
May 14.8 15.1 . 16.3 12.6 17.0 15.6 13.7 16.5 13.7
June 23.9 22.5 22.6 19.9 20.5 25.6 22.2 19.2 24.5
Julv 27 28.2 28.3 26.8 26.7 28.3 28.4 27.8 27.1
August 24.7 25.4 24.9 25.3 26.8 23.1 25.2 24.7 25.2
September 17.3 16.8 19.9 17.6 18.3 19.l 20.5 18.6 20.1
October 11.7 7.3 9.3 4.5 9.6 9.1 9.9 10 12.7
November 3.9 4.1 0.1 1.4 2.3 3.8 -1.1 2.0 0.7
December -4.5 -4.0 -4.4 -1.5 -5.2 -1.3 -2.0 -1.7 -0.9
Average 12-11.3 10.8 11.0 9.9 11.0 11.3 10.5 10.0 11.7 month
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EnergySolutions' 2024 Annual Meteorological Report.
Quality Assurance and Data Recovery
In accordance with the Clive Groundwater Permit, Appendix G, semiannual independent calibration and
verification examinations were completed on wind speed monitoring, precipitation monitoring, and
evaporation monitoring at the Clive site on April 23, 2024, and October 15, 2024. The independent
calibration and verification inspections were performed to ensure the meteorological instruments were
performing according to manufacturer specifications. These verification inspections were performed by
Trinity Consultants in accordance with the EPA's Quality Assurance Handbook for Air Pollution
Measurement Systems, Vol. IV: Meteorological Measurements, March 2008 and EPA's Ambient
Monitoring Guidelines for Prevention of Significant Deterioration, May 1987. The calibration and
verification examinations established that the instruments were properly calibrated and working correctly.
Table 5. Percent of data recovery for each meteorological sensor
Solar Wind Wind Temperature Pan Evaporation Precipitation Radiation Speed Direction
Annual 100.0 99.9 99.9 99.9 100.0 100.0 Recovery
All parameters achieved recovery greater than the Permit's Appendix G required 90%. Calibration checks
were performed semi-annually per the Groundwater Permit requirements; therefore, it appears that all
quality assurance protocols were satisfied (Table 5).
32-Year Summary and Comparison with 2024 Meteorological Year
This section of the report compares the on-site meteorological data for the most recent year
(January through December 2024) to the 32-year on-site data set (Table 6).
Wind Speed and Horizontal Wind Direction
Comparison of the most recent year of data and the 32-year on-site dataset shows that wind
speed and direction for both datasets were similar. For the most recent year, wind speeds
averaged 7.2 mph, which is the average for the 32-year period. Calm winds accounted for 1.2%
of the total winds measured during the most recent year, which is the average for the 32-year
period. The most common wind directions for both data periods are from the south-southwest,
south, east-northeast, and northeast.
For the 32-year period, the most frequent (and predominant) winds were from the south-
southwest (12.6%), followed by the east-northeast (12.2%) and the south (11.7%). On average,
the strongest winds were in the south sector at 4.3 mis (9.6 mph). Reported wind directions
represent the directions from which the wind is blowing.
For the 32-year period, 14.8% of wind speeds were greater than 5.14 mis (11.5 mph) and 0.9
percent were greater than 10.8 mis (24.2 mph). Most of the stronger wind speeds occurred in the
dominant wind directions. The maximum wind speed measured for the 32-year period was 30
mis (67.1 mph) on January 22, 1993.
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EnergySo/utions' 2024 Annual Meteorological Report.
Temperature
On-site temperature data for the most recent year (2024) was compared to the 32-year on-site
dataset. The mean temperature for the 32-year period was 10.8°C, while for the most recent year
(2024) the mean temperature was 1 l.7°C. The highest hourly temperature recorded during the
32-year data period was 4 l .3°C on June 21, 1999, compared to the highest hourly temperature of
40.3° Con July 11, 2024. The lowest hourly temperature recorded during the most recent year
was -14.8°C on January 16, 2024, while the lowest hourly temperature record during the 32-year
period was -3 l .5°C on January 14, 2013. The highest daily mean temperature (24-hour value) in
the 32-year data period was 33.5°C on June 29, 2010, compared to the highest daily mean
temperature of31.3°C on July 13, 2024. The lowest daily mean temperature (24-hour value) in
the most recent year was -8.6°C on January 16, 2024, compared to the lowest daily mean
temperature of -21.5°C on January 14, 2013, for the 32-year period.
Table 6 presents a comparison of 32-year monthly average temperatures to the January -
December 2024 monthly average temperature data. In general, a small amount of month-to-
month variation from the 32-year mean was observed. The biggest deviations came in February,
June, and October 2024, which were 2.6, 3.0, and 2.7 degrees warmer than the 32-year mean,
respectively.
Pan Evaporation
Pan evaporation data for the most recent year were compared to 29 years of valid on-site
evaporation data. The 29-year (1999, 2000 and 2004 not included) mean evaporation was
1340.98 mm (52.79 inches), while the evaporation for the most recent year (January-December
2024) was 1293.8 mm (50.94 inches), which is 1.85 inches below the long-term average.
Precipitation
On-site monthly total precipitation data collected during the most recent data year were
compared to the 32-year on-site average monthly values. Clive precipitation data for November
2002 through April 2003 were not usable and, therefore, were not included as part of the mean
average precipitation. Totaled monthly precipitation data recorded during the most recent year
(2024) was 185.17 mm (7.29 inches) which is below the 32-year average of 216.85 mm (8.54
inches).
Solar Radiation
On-site solar radiation data collected during the most recent data year were compared to the 32-
year on-site values. The mean daily solar radiation of 5121 W/m2/day measured during the most
recent data year is higher (1.03%) than the 32-year average value of 4987 W/m2/day.
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EnergySolutions' 2024 Annual Meteorological Report.
Table 6. 2024 and Clive 32-year average meteorological data.
2024 32-Year ***30-Year 2024 32-Year 2024 &32-Year Average Average Average *2024 Pan Average Average Average Daily Average
Month Monthly Monthly Evaporation Pan Precipitation Precipitation Solar Daily Solar
Temperature Temperature (inches) Evaporation (inches) (inches) Radiation Radiation
(QC) (QC) (inches) (W/m2) (W/m2)
Januarv -1.3 -2.4 0.49 0.75 2153
February 2.8 0.2 1.45 0.71 2939
March 5.2 5.4 1.66 0.97 4366
April 10.1 9.4 **1.44 **3.35 1.48 1.16 6222
May 13.7 15.2 7.33 7.43 0.35 1.09 7550
June 24.5 • 21.5 10.97 10.04 0.02 0.62 8174
July 27.1 26.8 11.87 12.40 0.08 0.27 8126
August 25.2 24.9 10.29 10.72 0.68 0.42 7053
September 20.1 18.5 6.76 6.66 0.08 0.60 5781
October 12.7 10.0 **2.27 **2.21 0.32 0.75 4275
November 0.7 2.4 0.43 0.47 2712
December -0.9 -2.7 0.25 0.60 2100
Annual
Average 11.7 10.8 50.94 52.86 7.29 8.54 5121
* Measured between April 23 to October 15, 2024.
** Data is only collected for part of April and October, because oflow temperatures.
*** Annual average is based on approximately 30-years of climatological data; see 'Issues' below
& Annual average is based on 30 years of annual precipitation totals, excluding 2002 and 2003 annual totals
CONCLUSIONS:
This annual and 32-year summary report summarizes the meteorological data collected at the
EnergySolutions monitoring station located at Clive, Utah during the 12-month period from
January 1, 2024, to December 31, 2024, and during the 32-year period from January 1, 1993,
through December 31, 2024. A summary of the annual 2024 meteorological data was prepared to
compare these data against the meteorological assumptions that were made in the original
infiltration and unsaturated zone modeling. A discussion of this data comparison is presented
here.
For infiltration modeling purposes, the approximate long-term mean monthly temperatures from
Dugway were assumed to be representative of the temperature at the Clive site. Temperature data
for input for the HELP model are summarized in Table 7. The monthly temperature in 2024 at
Clive is warmer than the HELP Model input value which indicates that 2024 was 1.3 degrees
Fahrenheit warmer than the 100-year data used in the HELP model. Comparisons of the 32-year
monthly averages with the HELP model data indicated slightly cooler conditions (0.3 degrees
Fahrenheit).
11
2191
3286
4629
5921
7076
7938
7812
6882
5626
3963
2591
1935
4987
EnergySolutions' 2024 Annual Meteorological Report.
Table 7. HELP Model Input and Actual Temperature Measurement Comparison in Degrees
Fahrenheit
Dugway Clive Clive HELP · Difference Difference
Month Average Average 32-Year Model Between Between 32-
2024 Monthly Monthly Average Input 2024 Temp. Year Temp. and
Temp. Temp. Monthly Value and HELP HELP Input
2024 2024 Temo. Inout Values Values
January 31.0 29.7 27.7 27 2.7 0.7
February 37.1 37.0 32.4 34 3.0 -1.6
March 42.2 41.4 41.7 40 1.4 1.7
April 53.S 50.2 49.0 so 0.2 -1.0
tay 58.0 56.7 59.3 60 -3.3 -0.7
June 77.0 76.1 70.6 69 7.1 1.6
July 81.8 80.8 80.2 78 2.8 2.2
August 78.0 77.4 76.9 76 1.4 0.9
September 68.7 68.2 65.4 65 3.2 0.4
October 56.6 54.9 50.0 53 1.9 -3.0
ovember 35.6 33.3 36.3 39 -5.7 -2.7
December 32.7 30.4 27.2 29 1.4 -1.8
Annual Averaqe 54.3 53.0 51.4 51.7 1.3 -0.3
The base case for the HELP model input for annual precipitation was 201 .17 millimeters (mm)
(7.92 inches). The total precipitation for the Clive 2024 reporting year was 185.17 mm (7.29
inches) while the 32-year precipitation average for the Clive facility was 216.85 mm (8.54
inches). Comparing the 2024 precipitation totals to the base case, 2024 was dryer than the
historical average used for modeling purposes while the Clive site 32-year average was wetter.
EnergySolutions Ground Water Quality Discharge Permit requires wind speed and direction and
pan evaporation measurements to be made annually. Reported wind directions represent the
directions from which the wind is blowing. For the J.anuary through December 2024 period, the
highest percentage of winds were found in the south-southwest (12.6%), with the second most
frequent direction being the east-northeast (11 .9%). Wind speed records show 1.2% calm winds
with an annual average speed of 3.2 meters per second (m/s) or 7.2 miles per hour. Calms are
defined as wind speeds less than 0.5 mis.
The amount of pan evaporation measured for the year 2024 was 1293.8 mm (50.94 inches),
bringing the 30-year annual average (1999, 2000 and 2004 not included) at the Clive facility to
1340.948 mm (52.79 inches).
The mean daily solar radiation of 5121 W /m2/day measured during the most recent data year is
higher (1.03%) than the 32-year average value of 4987 W/m2/day.
Given the agreement between the on-site meteorological data and the long-term off-site data, it is
reasonable that the meteorological assumptions made during the original infiltration and
unsaturated zone modeling are representative of the actual conditions at the site.
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EnergySolutions' 2024 Annual Meteorological Report.
COMPLIANCE STATUS:
No compliance issues were discovered during this inspection.
ISSUES:
Upon initial submission, monthly averages from the long-term pan evaporation data provided in
Figure 4.2 of Trinity Consultants' report did not provide specific values. After discussion with
Energy Solutions' Mathew Schon, a revised Figure 4.2 was submitted to the Division and has
been attached to this report (DRC-2025-001606) (see Appendix A). There were no other issues
identified in the review of Energy Solutions and Trinity Consultants' 2024 Annual
Meteorological Report for Energy Solutions' Clive facility.
SIGNATURE:
-
Andre geologist
LLR ction
Utah Di vision of Waste Management and Radiation Control
Reviewed and Approved By:
Bailey Anderson, Hydrogeologist
LLR W Section
Utah Division of Waste Management and Radiation Control
&,um~~ager
LLR W Section
Utah Division of Waste Management and Radiation Control
13
5/21/2025
Date
5/21/2025
Date
EnergySolutions' 2024 Annual Meteorological Report.
APPENDIX A:
Revised Figure 4.2 for Monthly Mean Pan
Evaporation
Submitted: May 15, 2025
14
EnergySolutions' 2024 Annual Meteorological Report.
14.00
u;-12.00
Q)
"fi 10.00
C:
-; 8.00
0 i 6.00 ...
0 g-4.00
> w 2.00
0.00
--
--
Monthly Mean Evaporation 1993 -2024
(Clive)
12.40 -10.72 10.04 ---
7.43 --~6~06 r----,---
3.35 --r------
r--2.21 ------
0.00 0.00 0.73 I I n
15
0.12 0.00