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MD - 0187

Miscellaneous
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MD - 0187 Owner Brian Speer
Application Status Program Manager Review
Program Solid Waste SLVSWMF is submitting the semi-annual
groundwater monitoring report for the
SLVSWMF Landfill, for the Fall 2024
period.
Created By Amit Nair, 2/25/2025, 3:48 PM Last Modified By Amit Nair, 2/25/2025, 3:50 PM
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Dear Amit Nair,
The purpose of this email is to inform you that the Division of Waste Management and Radiation
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Dear Brian Speer,
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3/10/25, 11:09 AM MD - 0187 ~ Salesforce - Unlimited Edition
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The purpose of this email is to notify you that Amit Nair has submitted a miscellaneous document for
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Please review the document and assign it to the appropriate staff member.
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25000032.001A/SLC25R177370 Page i of iii February 20, 2025
© 2025 Kleinfelder www.kleinfelder.com
SEMIANNUAL
GROUNDWATER MONITORING REPORT
FALL 2024
ACTIVE LANDFILL AREA
SALT LAKE VALLEY SOLID WASTE MANAGEMENT FACILITY
SALT LAKE CITY, UTAH

KLEINFELDER PROJECT NO. 25000032.001A

FEBRUARY 20, 2025

Copyright 2025 Kleinfelder
All Rights Reserved

ONLY THE CLIENT OR ITS DESIGNATED REPRESENTATIVES MAY USE THIS DOCUMENT AND ONLY FOR THE SPECIFIC PROJECT FOR WHICH THIS
REPORT WAS PREPARED.
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A Report Prepared for:
Salt Lake Valley Solid Waste Management Facility
6030 South California Avenue
Salt Lake City, UT 84104
SEMIANNUAL
GROUNDWATER MONITORING REPORT
FALL 2024
ACTIVE LANDFILL AREA
SALT LAKE VALLEY SOLID WASTE MANAGEMENT FACILITY
SALT LAKE CITY, UTAH
Prepared by:
_______________________________________
Daniel Salas
Staff Professional
Reviewed by:
_______________________________________
Dylan Pike, P.G.
Project Manager
Mike Gronseth P.E., P.G.
Principal Professional
KLEINFELDER
849 West Levoy Drive, Suite 200
Salt Lake City, Utah 84123
Phone: [phone]
February 20, 2025
Kleinfelder File No: 25000032.001A
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TABLE OF CONTENTS
SECTION ......................................................................................................................................... PAGE
1 INTRODUCTION AND BACKGROUND ........................................................................................ 1
1.1 INTRODUCTION ................................................................................................................... 1
1.2 BACKGROUND ..................................................................................................................... 1
2 GROUNDWATER ASSESSMENT ................................................................................................. 4
2.1 GROUNDWATER LEVEL MEASUREMENTS, ELEVATIONS, AND GRADIENT ......................... 4
2.2 GROUNDWATER SAMPLING AND ANALYSIS ....................................................................... 5
2.3 GROUNDWATER ANALYTICAL RESULTS .............................................................................. 5
2.3.1 Metals .................................................................................................................... 5
2.3.2 Other Compounds ................................................................................................. 7
2.3.3 Organic Compounds .............................................................................................. 7
2.3.4 Statistical Analysis Background..............................................................................8
2.3.5 Fall 2024 Statistical Analysis Results......................................................................9
2.3.6 Quality Control ..................................................................................................... 10
3 CONCLUSIONS ....................................................................................................................... 13
4 LIMITATIONS ......................................................................................................................... 14
5 REFERENCES .......................................................................................................................... 15
TABLES
1 Groundwater Gauging Data, Fall 2024
2 Groundwater Sample ID Log, Fall 2024
3 Laboratory Analytes for Groundwater Monitoring
4 Summary of Laboratory Analytical Results, November 2019 through October 2024
5 Comparison of Absolute Concentrations, Normalized Concentrations (Zi), and CUSUM Values (Si),
For Downgradient Monitoring Wells, Fall 2024
6 Summary of Quality Control Results, Fall 2024
FIGURES
1 Site Vicinity Map
2 Fall 2024 Groundwater Elevations and Potentiometric Surface Map
APPENDICES
A Field Data Sheets
B Laboratory Analytical Reports
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1 INTRODUCTION AND BACKGROUND
1.1 INTRODUCTION
The Active Landfill area of the Salt Lake Valley Solid Waste Management Facility (SLVSWMF) is located at
6030 West California Avenue in Salt Lake City, Utah (Figure 1). Groundwater monitoring at the
Active Landfill has been conducted semiannually since 1993 and summarized in semiannual reports
submitted to the Utah Division of Waste Management and Radiation Control (DWMRC) and the
Salt Lake County Health Department (SLCHD).
The Fall 2024 groundwater monitoring activities were conducted from October 23 through
October 29, 2024. Monitoring activities included measuring depth to groundwater, sample collection,
and laboratory analysis of groundwater samples collected from ten (10) groundwater monitoring wells
(MW-1A through MW-7A, MW-8B, MW-9A and well F). The Fall 2024 groundwater monitoring event
was conducted in accordance with Kleinfelder’s Groundwater Monitoring Plan (SLC23R151837) dated
March 24, 2023 (Kleinfelder, 2023).
1.2 BACKGROUND
The initial background water quality for metals was established at the Active Landfill area from
December 1993 to August 1994 for the groundwater monitoring wells
MW-1A, MW-2A, MW-3A, MW-4A, MW-6A, and MW-7A. The monitoring wells
(MW-1A through MW-7A) were sampled eight (8) times during that monitoring period, twice for each
quarter. This background data was used to construct the initial combined Shewhart-CUSUM
(cumulative sum) control charts for intra-well detection monitoring of several analytes in each
groundwater monitoring well over time.
In October 1994, the SLVSWMF began semiannual groundwater monitoring at the Active Landfill. During
the Fall 1994 through Spring 1996 monitoring events, concentrations of several analytes increased
relative to the established background conditions. The increases were most pronounced in upgradient
groundwater monitoring well MW-1A (e.g., arsenic, calcium, iron, magnesium, manganese, potassium,
sodium, alkalinity, bicarbonate, chloride, sulfate, total dissolved solids [TDS], and total organic carbon
[TOC]). Some increases in analyte concentration were also noted in downgradient groundwater
monitoring wells. Several of the analytes with increased concentrations occur naturally at relatively high
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concentrations in shallow groundwater in the Salt Lake Valley
(e.g., calcium, magnesium, potassium, sodium, chloride, and TDS). At the time of the sampling event, the
downgradient groundwater monitoring wells with increased analyte concentrations were too far
(based on the age of waste and groundwater gradient) from buried refuse to have been impacted by the
Active Landfill. Therefore, the analyte concentration increases appeared to represent natural variations
in water quality that were not evident during the initial background monitoring period.
Groundwater monitoring well MW-5A was installed during the Fall of 1995. From Fall 1995 through
Spring 1997, eight groundwater samples were collected from MW-5A. The data from these eight (8)
samples were used to establish the background groundwater conditions for MW-5A.
Groundwater monitoring well F was temporarily added to the monitoring program in Spring 1997 in
response to a request from SLCHD. This groundwater monitoring well is not considered part of the
established monitoring network because it is an interior well and will be abandoned and covered with
waste in the future. Consequentially, groundwater monitoring well F is not included in the statistical
analysis used for wells included in the monitoring network or for calculating the groundwater gradient,
as requested by the SLCHD in a memorandum dated October 5, 2007.
By Fall 2004, no indication of Landfill leakage was apparent when comparing reported concentrations in
upgradient and downgradient groundwater monitoring wells; however, the observed natural changes in
groundwater were substantial enough that the statistical control limits no longer adequately
represented non-impacted groundwater. In the Fall 2004 groundwater report, the SLVSWMF
recommended updating and adjusting the statistical limits for the Landfill to better reflect local
upgradient groundwater conditions. The statistical control limits were revised in accordance with
American Society for Testing and Materials (ASTM) D 6312-98, Standard Guide for Developing
Appropriate Statistical Approaches for Groundwater Detection Monitoring Programs.

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The background dataset for groundwater monitoring wells MW-11A, MW-12A, and MW-13A was
initially established between March 2010 and February 2011 and was updated during the Spring 2016
report to better reflect natural variability of the detected analytes in the groundwater. In accordance
with the 2023 Groundwater Monitoring Plan, MW-11, MW-12, and MW-13 were not included in the Fall
2024 groundwater monitoring event because the nearby leachate pond has not been used to store
leachate (Kleinfelder, 2023). Groundwater monitoring wells MW-11A through MW-13A will be
reincorporated into the groundwater monitoring well network following closure of the Active Landfill
and prior to use of the leachate pond.
Monitoring well MW-8A was abandoned in March 2023 in advance of the Module 8 construction
activities. Monitoring wells MW-8B and MW-9A were subsequently installed to assess and monitor
groundwater down-gradient of the Active Landfill.
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2 GROUNDWATER ASSESSMENT
2.1 GROUNDWATER LEVEL MEASUREMENTS, ELEVATIONS, AND GRADIENT
Depth to water measurements were recorded for the ten (10) established groundwater monitoring wells
(MW-1A through MW-7A, MW-8B, MW-9A, and F) for groundwater elevation contour calculations on
October 23, 2024, following the protocol established in the Groundwater Monitoring Plan
(Kleinfelder, 2023). The depth to groundwater measurements are presented on the Groundwater
Gauging Sheet in Appendix A. Groundwater monitoring well locations and corresponding groundwater
elevations are shown on Figure 2.
Groundwater elevations were calculated by subtracting the depth to water from the surveyed
groundwater monitoring well casing elevations and recorded in feet above mean sea level (amsl).
Groundwater gauging data and groundwater elevations for the monitoring wells are presented in Table
1. The depth to water and the corresponding groundwater elevations from groundwater monitoring well
F was not included in gradient calculations due to the difference in groundwater elevations of the
surrounding wells.
During the Fall 2024 monitoring event, groundwater elevations in the in-network groundwater
monitoring wells ranged from 4216.23 feet amsl in groundwater monitoring well MW-9A to 4224.34
feet amsl in groundwater monitoring well MW-3A. The general groundwater gradient at the Landfill is
approximately 0.0015 ft/ft which is similar to past observations. The Fall 2024 groundwater
potentiometric surface contour map, provided in Figure 2, depicts groundwater flow direction generally
to the west/southwest across the main portion of the Landfill.

Based on the groundwater flow direction calculated from the measured groundwater elevations,
groundwater monitoring wells MW-2A and MW-3A are up-gradient, MW-1A, MW-4A, MW-5A, MW-6A,
are cross-gradient, and MW-7A, MW-8B, and MW-9A are down-gradient of the Landfill. Groundwater
monitoring well F is an internal well and is neither an up- nor down-gradient well.

Groundwater elevation recorded at monitoring well MW-4A during the Fall 2024 monitoring event was
not consistent with past monitoring events and was therefore not included in the groundwater surface
contour calculations.
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2.2 GROUNDWATER SAMPLING AND ANALYSIS
Groundwater samples were collected from the ten (10) groundwater monitoring wells
(MW-1A through MW-7A, MW-8B, MW-9A, and F) from October 24, 2024, through October 29, 2024.
Groundwater monitoring wells MW-1A, MW-3A, MW-6A, MW-7A, MW-8B, and MW-9A were sampled
using low-flow sampling techniques in general accordance with United States Environmental Protection
Agency (EPA) procedures (EPA, 2017) and the Groundwater Monitoring Plan (Kleinfelder, 2023). Due to
low groundwater recharge rates, monitoring wells F, MW-2A, MW-4A, and MW-5A were bailed dry and
sampled with a bailer, in accordance with the Groundwater Monitoring Plan (Kleinfelder, 2023). Water
quality parameters measured during purging are included on the Field Data Sheets in Appendix A. The
sample identification numbers, and time of collection are shown on Table 2.
The groundwater samples were labeled, immediately placed on ice within a laboratory provided cooler
after sampling and submitted to Pace Analytical National Center for Testing and Innovation (Pace) in Mt.
Juliet, Tennessee, under chain-of-custody documentation for analysis of the metals and other
compounds listed in Table 3, as required by Utah Administrative Code (UAC) Regulation 315-308 and
SLCHD Health Regulation #1.
2.3 GROUNDWATER ANALYTICAL RESULTS
The groundwater samples were analyzed for dissolved concentrations of metals, inorganic compounds,
and organic compounds. Analytical results for the Fall 2024 groundwater samples are summarized in
Table 4, along with analytical data collected at the Active Landfill since 2019. Historical analytical results
prior to 2019 are available in previous reports or upon request. The Solid Waste Groundwater Quality
Protection Standards (SWGQPS) for each analyte, where established, are provided in Table 4 for
comparison. Copies of the laboratory reports for the Active Landfill results are included in Appendix B.
2.3.1 Metals
Laboratory analytical results indicate that nickel was reported in downgradient monitoring well MW-9A
at a concentration of 0.1900 milligrams per liter (mg/L), exceeding its SWGQPS of 0.1 mg/L. There were
no other reported concentrations of metals above their respective SWGQPS during this monitoring
event.

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Concentrations of antimony, arsenic, barium, cadmium, chromium, cobalt, copper, selenium, thallium
and vanadium were reported above their method detection limit (MDL) and below their respective
SWGQPS in one or more of the groundwater monitoring wells sampled during the Fall 2024 monitoring
event. Analytes with an established SWGQPS that had concentrations reported above the MDL, but
below their respective SWGQPS include:

Antimony in all monitoring wells sampled;
arsenic in MW-1A;
barium in all monitoring wells sampled;
chromium in MW-7A;
cobalt in MW-9A;
copper in MW-7A and MW-9A;
selenium in MW-3A.
thallium in MW-9A;
and vanadium in MW-9A.

The RDL exceeds the SWGQPS for the following analytes:

antimony in MW-6A;
beryllium in wells MW-2A, MW-3A, MW-5A, MW-6A, MW-8B, and F;
cadmium in well MW-3A and MW-6A;
lead in monitoring wells MW-3A and MW-6A;
thallium in wells MW-2A, MW-3A, MW-5A, MW-6A, MW-8B, and F.

For each sample where the RDL exceeded the SWGQPS for antimony, beryllium, cadmium, lead, and
thallium, Kleinfelder compared the SWGQPS to the laboratory MDL. In each case, the MDL was below
the SWGQPS. Kleinfelder personnel have requested Pace to minimize dilutions to lower RDLs, however,
due to matrix interference from naturally elevated salinity in the groundwater, Pace must perform some
dilutions to preserve the calibration of analytical equipment in the laboratory.

Statistical trends are discussed in Section 2.3.5.
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2.3.2 Other Compounds
Highly soluble minerals and other compounds without an established SWGQPS are included in the
groundwater analysis to provide additional indications of mineral transport from the Active Landfill to
groundwater. Included in this section are the following analytes:
alkalinity;
bicarbonate;
carbonate;
sulfate;
chloride;
calcium;
potassium;
sodium;
magnesium;
TOC;
ammonia as nitrogen;
nitrate;
nitrite;
phenols;
TDS; and
chemical oxygen demand (COD).
Concentrations of other compounds were generally similar to concentrations reported in previous
monitoring events. Further statistical analysis as required by UAC Regulation 315-308 is discussed in
Section 2.3.5.
2.3.3 Organic Compounds
Laboratory analytical results indicate there were no concentrations of volatile organic compounds
(VOCs) reported above their respective RDLs in the groundwater samples collected during the Fall 2024
sampling event.
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2.3.4 Statistical Analysis Background
Due to the observed significant spatial variations in local groundwater quality, the SLVSWMF uses
intra-well comparisons to monitor for potential impacts to groundwater. Analyte concentration trends
are evaluated numerically—first ‘standardized’, then evaluated using the Shewhart-CUSUM approach to
calculate the cumulative sum as described in ASTM D6312-17 and the 2023 Groundwater Monitoring
Plan.
The standardized concentration (Zi) is calculated for each analyte in individual wells as follows:
Zi = (Xi-m)/S
Where Xi equals the measured parameter concentration for the sampling period; m equals the mean
concentration of that parameter over time, excluding anomalous values; and S equals the standard
deviation of that parameter in the well during the background sampling period. Thus, the purpose of the
Zi is to measure how a given parameter concentration compares with the mean “background”
concentration for that parameter. Anomalous values are Zi exceedances in one sampling event that
were not confirmed in the following sampling event and are therefore excluded in future cumulative
sum and background mean calculations.
The cumulative sum (Si) is calculated for each analyte in individual wells as follows:
Si = max {0, (Zi-1 + Si-1)}
Where Si is equal to the maximum value (max) of either zero or the sum of the Zi minus 1 and the
cumulative sum from the previous sampling period (Si-1). The Si tracks increases in analyte
concentrations by increasing in value when the Zi is greater than one standard deviation above the
mean. Thus, the purpose of the Si is to identify small and persistent increases in concentrations that
otherwise, would not appear significant based on results of individual sampling events.

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In accordance with the ASTM D6312-17 guidance, for background datasets with less than 13 samples,
the Zi and Si control limits are established as 4.5 and 5 standard deviations above the background mean
concentration respectively. For background data sets with greater than 13 samples, the Zi and Si control
limits are established as 4 standard deviations above the background mean concentration.
Following each groundwater monitoring event, laboratory analytical results are evaluated for
‘statistically significant’ increases by: (1) comparing Zi and Si against control limits (See Table 5) for each
analyte detected more than 25 percent of the time during the background period; or (2) comparing the
absolute concentration to a non-parametric prediction limit (NPL) calculated based on the maximum
concentration from the first eight (8) sampling events for the analytes that were detected less than 25
percent in the background dataset.
A statistically significant increase (SSI) is declared for an analyte if a control limit or NPL is exceeded in
two consecutive monitoring events. A summary of the Shewart-CUSUM analysis for cross- and
down-gradient wells is included on Table 5. Shewart-CUSUM analysis was not performed on the
up-gradient wells.
2.3.5 Fall 2024 Statistical Analysis Results
No absolute analyte concentrations exceeded their respective NPL for the low detection rate wells
(analytes detected in less than 25% of background samples).
Of the analytes detected at a frequency greater than 25% in the background dataset, nitrate in sample
MW-9A exceeded the Zi and the Si control limits of 4 standard deviations during this monitoring event.
This is the first control limit exceedance for nitrate in MW-9A, Kleinfelder will reevaluate the nitrate
concentration in MW-9A following the Spring 2025 groundwater monitoring event.

There were no other exceedances of Zi or Si control limits during this monitoring event.

During the Spring 2024 groundwater monitoring event, COD in sample MW-8B exceeded the Zi control
limit of 4 standard deviations. Statistical analysis results indicate that COD in sample MW-8B did not
exceed the Zi or Zi control limits during the Fall 2024 groundwater monitoring event, and therefore does
not qualify as an SSI. Additionally, since the COD concentration reported in the MW-8B sample collected
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during the Spring 2024 monitoring event was not confirmed during the Fall 2024 monitoring event, the
Spring 2024 concentration will be considered anomalous and excluded from inclusion in future
statistical calculations.

2.3.6 Quality Control
The laboratory provided data for method blanks, surrogate compound recoveries, and laboratory-
prepared matrix spike/matrix spike duplicates (MS/MSD) along with their data packets. Qualifiers are
noted in the lab reports in Appendix B and in Table 4.
The following presents a summary of the Quality Control (QC) evaluation for various samples:
J Qualifiers, indicating an estimated value, were reported in the samples and analytes listed
below:

- MW-1A: total phenol, antimony, copper, iron, and potassium.
- MW-2A: antimony, arsenic, cadmium, and nickel.
- MW-3A: antimony, arsenic, and nitrite.
- MW-4A: antimony, arsenic, copper, sulfate, and TOC.
- MW-5A: antimony, TOC.
- MW-6A: TOC.
- MW-7A: antimony, arsenic, chromium, cobalt, nickel, zinc, and TOC.
- MW-8B: antimony, arsenic, and TOC.
- MW-9A: antimony, arsenic, cadmium, thallium and vanadium.
- F: antimony, arsenic, cobalt, nickel and selenium.
- DUP-1: arsenic, cadmium, thallium, vanadium, and TOC.

J3 Qualifiers, indicating the associated batch QC was outside the established range for precision,
were reported for ethylene dibromide in samples MW-3A, MW-6A, and MW-8B.
J4 Qualifiers, indicating the associated batch QC was outside the established range for accuracy,
were reported in the samples and analytes listed below:

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- MW-1A: styrene and trans-1,3-dichloropropene.
- MW-3A: iodomethane.
- MW-6A: iodomethane.
- MW-7A: 1,4-dichlorobenzene, and chloromethane.
- MW-8B: iodomethane.
- MW-9A: 1,4-dichlorobenzene and chloromethane.
- DUP-1: 1,4-dichlorobenzene, and chloromethane.
- TRIP BLANK 2: 1,4-dichlorobenzene, and chloromethane.

J6 Qualifiers, indicating the associated the sample matric interfered with the ability to make any
accurate determination, leading to low spike values, were reported for total phenol and nitrate
in sample MW-8B.
B Qualifiers, indicating that the analyte was found in the associated blank and the reported
concentration is possibly high, were reported in the samples and analytes listed below:

- MW-1A: TOC.
- MW-2A: antimony.
- MW-4A: antimony and copper.
- MW-5A: antimony.

V Qualifiers, indicating the sample concentration is too high to evaluate accurate spike
recoveries, were reported for calcium, magnesium, sodium and sulfate in sample MW-8B.
The surrogate compound recoveries are located on each VOC analysis report. Surrogate compounds are
substances intentionally added by the laboratory to determine analytical system stability and any
possible sample matrix effects. Surrogate compounds are chosen for their rareness in the environment
and their similarity to the target analytes. For the VOC analysis, three surrogates are utilized to assess
whether the data is considered acceptable. The surrogate compound recoveries were generally reported
within the laboratory control limits.

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One field duplicate sample (DUP-1) was collected from groundwater monitoring well MW-9A and
submitted to the laboratory during this sampling event to assess data quality. The EPA quality assurance
guidelines establish that the range of quality in precision (the relative percent difference or RPD)
between two measurements does not exceed 20% for aqueous samples (EPA, 2002). The RPD calculated
for ammonia as nitrogen was 26.77%, exceeding the EPA guidelines. RPD values calculated for DUP-1
and the parent sample MW-9A generally did not exceed the EPA guidelines, therefore, the data is
considered sufficiently precise. The results of the RPD evaluation are included in Table 6.

MS/MSDs were performed by Pace for every group of delivered samples. Additionally, a field MS/MSD
was collected at monitoring well MW-8B. Results of the MS/MSD analyses were generally within the
recommended limits. The complete MS/MSD results are available in the lab reports presented in
Appendix B.

Laboratory-supplied trip blanks accompanied the samples for the groundwater samples collected from
the Active Landfill area during the Fall 2024 groundwater monitoring event. The trip blanks were
analyzed by Pace for the complete list of VOCs. No VOCs were reported above the laboratory MDL in the
trip blanks submitted for analysis, indicating that cross contamination during sample storage and
transportation is unlikely.
Qualifiers reported by the laboratory for the samples analyzed are included in the laboratory analytical
report in Appendix B. The analytical data presented in this report meets Pace quality control
requirements and is suitable for the intended use with the above-mentioned qualifiers.
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3 CONCLUSIONS
The Fall 2024 groundwater monitoring event was conducted from October 23, 2024, to
October 29, 2024, in accordance with SLVSWMF’s Groundwater Monitoring Plan (dated April 6, 2023).
The groundwater elevations in the groundwater monitoring wells ranged from 4216.23 feet amsl at
monitoring well MW-9A to 4224.34 feet amsl at monitoring well MW-3A. The average calculated
groundwater gradient under the Active Landfill is 0.0015 ft/ft. Based on the calculated potentiometric
surface, groundwater generally flows to the west/southwest underneath the Active landfill.
Laboratory analytical results from the collected groundwater samples indicate that sample MW-9A
contained nickel at a concentration of 0.1900 mg/L, exceeding the established SWGQPS of 0.1 mg/L.
No other analytes were reported at concentrations exceeding their respective SWGQPS during the Fall
2024 groundwater monitoring event. Kleinfelder will continue to monitor nickel concentrations in
MW-9A following the Spring 2025 groundwater monitoring event.
No SSIs were declared based on the results of the Fall 2024 groundwater statistical evaluation.
Kleinfelder also compared the results of the Fall 2024 Semiannual Leachate Monitoring Report – Active
Landfill Area conducted during the Fall 2024 period (Document #SLC24R175245) to the analytical results
reported for the Active Landfill in the Fall 2024 period. Groundwater quality was generally similar across
the groundwater monitoring well network and based on the analytical data and analysis, no indication
of leakage from the Active Landfill was evident.
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4 LIMITATIONS
This work was performed in a manner consistent with that level of care and skill ordinarily exercised by
other members of Kleinfelder’s profession practicing in the same locality, under similar conditions and at
the date the services are provided. Our conclusions, opinions and recommendations are based on a
limited number of observations and data. It is possible that conditions could vary between or beyond
the data evaluated. Kleinfelder makes no other representation, guarantee or warranty, express or
implied, regarding the services, communication (oral or written), report, opinion, or instrument of
service provided.

This report may be used only by the Client and the registered design professional in responsible charge
and only for the purposes stated for this specific engagement within a reasonable time from its
issuance, but in no event later than two years from the date of the report.
The work performed was based on project information provided by Client. If Client does not retain
Kleinfelder to review any plans and specifications, including any revisions or modifications to the plans
and specifications, Kleinfelder assumes no responsibility for the suitability of our recommendations. In
addition, if there are any changes in the field to the plans and specifications, Client must obtain written
approval from Kleinfelder’s engineer that such changes do not affect our recommendations. Failure to
do so will vitiate Kleinfelder’s recommendations.
Land or facility use, on- and off-site conditions, regulations, or other factors may change over time, and
additional work may be required with the passage of time. Any party other than the client who wished
to use this report shall notify Kleinfelder of such intended use. Based on the intended use of the report,
Kleinfelder may require that additional work be performed and that an updated report be issued. Any
unauthorized use of this document will release Kleinfelder from any liability resulting from the use of
this report by any unauthorized party and client agrees to defend, indemnify, and hold harmless
Kleinfelder from any claim or liability associated with such unauthorized use or non-compliance.
24000052.001A/SLC25R177370 Page 15 of 15 February 20, 2025
© 2025 Kleinfelder www.kleinfelder.com
5 REFERENCES
American Society for Testing and Materials, 1998. Standard Guide for Developing Appropriate Statistical
Approaches for Groundwater Detection Monitoring Programs at Waste Disposal Facilities
(D6312-98), 1998.
American Society for Testing and Materials, 2017. Standard Guide for Developing Appropriate Statistical
Approaches for Groundwater Detection Monitoring Programs at Waste Disposal Facilities
(D6312-17), 2017.
EPA, 2002. EPA Guidance on Preparing a Quality Assurance Project Plan, QA/G-5, EPA/240/R-02/009,
December 2002.
EPA, 2017. Low-Stress (low flow) Purging and Sampling Procedure for the Collection of Groundwater
Samples from Monitoring Wells, Environmental Protection Agency, September 2017.
Kleinfelder, 2023. Groundwater Monitoring Plan, Salt Lake Valley Solid Waste Management Facility, Salt
Lake County, Utah, Kleinfelder Document: SLC23R151837, dated March 24, 2023.
MW 1A 4230.91
8.73 4222.18
MW 2A 4231.66 8.19 4223.47
MW 3A 4233.86
9.52 4224.34
MW 4A 4229.30 8.22 4221.08
MW 5A 4229.28
6.62 4222.66
MW 6A 4228.48 6.77 4221.71
MW 7A 4225.21
4.57 4220.64
MW 8B 4226.45 7.58 4218.87
MW 9A 4230.69
14.46 4216.23
F 4231.32
13.88 4217.44
Notes
TOC = top of casing
ft = feet
amsl = above mean sea level (vertical datum: NAVD88)
*
Active Landfill Area
TABLE 1
Groundwater Elevation Data
Salt Lake Valley Solid Waste Management Facility
Fall 2024
Well ID
TOC Elevation
(ft amsl)*
Depth to
Groundater (ft
below TOC)
Groundwater Elevation
(ft amsl)
= elevations use NAD83/NAVD88 horizontal and vertical datums In
Utah State Plane, Central Zone, US Survey Feet
25000032.001A/SLC25R177370
© 2025 Kleinfelder
Page 1 of 1 February 20, 2025
MW 1A MW 1A 10/29/2024 08:50:00
MW 2A MW 2A 10/24/2024 10:00:00
MW 3A MW 3A 10/28/2024 12:44:00
MW 4A MW 4A 10/24/2024 09:10:00
MW 5A MW 5A 10/24/2024 08:00:00
MW 6A MW 6A 10/28/2024 10:56:00
MW 7A MW 7A 10/25/2024 11:45:00
MW 8B MW 8B 10/28/2024 08:39:00
MW 9A MW 9A 10/25/2024 09:03:00
MW 9A DUP 1 10/25/2024 07:00:00
F F 10/24/2024 11:40:00
Date Sample
Collected
Time Sample
Collected
Table 2
Salt Lake Valley Solid Waste Management Facility
Groundwater Sample ID Summary
Active Landfill Area
Fall 2024
Well ID Field Sample ID
DUP 1 = Duplicate sample collected from groundwater monitoring well
MW 9A
25000032.001A/SLC25R177370
© 2025 Kleinfelder
Page 1 of 1 February 20, 2025
Alkalinity as CaCO3
Bicarbonate as CaCO3
Carbonate as CaCO3
Sulfate
Chloride
Calcium
Potassium
Sodium
Magnesium
Antimony (Dissolved)
Arsenic (Dissolved)
Barium (Dissolved)
Beryllium (Dissolved)
Cadmium (Dissolved)
Chromium (Dissolved)
Cobalt (Dissolved)
Copper (Dissolved)
Iron (Dissolved)
Lead (Dissolved)
Manganese (Dissolved)
Mercury (Dissolved)
Nickel (Dissolved)
Selenium (Dissolved)
Silver (Dissolved)
Thallium (Dissolved)
Vanadium (Dissolved)
Zinc (Dissolved)
Total Organic Carbon (TOC)
Ammonia as N
Nitrate as N
Nitrite as N
Phenols
Total Dissolved Solids (TDS)
Chemical Oxygen Demand (COD) (Active Landfill Only)
Turbidity
Active Landfill: Volatile Organics (EPA 8260 and EPA 504 for EDB & DBCP)
Wildlife Landfill:Volatile Organics (EPA 8260)
Pre 82 Landfill:Volatile Organics (EPA 8260)
Organics
Table 3
Laboratory Analytes for Groundwater Monitoring
Salt Lake Valley Solid Waste Management Facility
General Minerals
Dissolved Metals
Other
Active Landfill Area
25000032.001A/SLC25R177370
© 2025 Kleinfelder
Page 1 of 1 February 20, 2025
MW 4A MW 5A MW 6A MW 7A MW 8B MW 9A SWGQPS
Antimony Conc. 0.000384 0.00358 < 0.0400 0.000321 0.00263 0.000491 0.006
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.005 0.100 0.005 0.005 0.030 0.030
Arsenic Conc. 0.000311 < 0.0100 < 0.0200 0.00144 0.00263 0.000491 0.02
Arsenic*Zi ND25 ND25 ND25 1.923 1.357 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.0050 0.0050 0.0050 4 4 0.0150
Barium Conc. 0.0679 0.082 0.0632 0.158 0.00263 0.000491 2
Zi 1.05 0.707 0.198 0.07 0.725 0.410
Si 0.00 0.00 0.00 0.73 0.42 0.00
Limit* 4 4 4 4 4 4
Beryllium Conc. < 0.00200 < 0.0100 < 0.0200 < 0.00200 0.00263 0.000491 0.004
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.005 0.005 0.005 0.005 0.0150 0.0150
Cadmium Conc. < 0.00100 < 0.00500 < 0.0100 < 0.00100 0.00263 0.000491 0.005
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.0110 0.0100 0.0100 0.0100 0.0100 0.0100
Calcium Conc. 151 517 332 664 0.00263 0.000491 NA
(undissolved)Zi 1.20 1.16 1.47 0.24 1.002 0.279
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
Chromium Conc. < 0.00200 < 0.0100 < 0.0200 0.00104 0.00263 0.000491 0.1
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.0400 0.0300 0.0400 0.0700 0.0150 0.0150
ANALYTE
METALS
Comparison of Absolute Concentrations, Normalized Concentrations (Z i ), and
Table 5
Salt Lake Valley Solid Waste Management Facility
Active Landfill Area
Fall 2024
CUSUM Values (S i ) For Downgradient Groundwater Monitoring Wells
24000052.001A/SLC25R177370
© 2025 Kleinfelder
Page 1 of 5 February 20, 2025
MW 4A MW 5A MW 6A MW 7A MW 8B MW 9A SWGQPS
ANALYTE
Comparison of Absolute Concentrations, Normalized Concentrations (Z i ), and
Table 5
Salt Lake Valley Solid Waste Management Facility
Active Landfill Area
Fall 2024
CUSUM Values (S i ) For Downgradient Groundwater Monitoring Wells
Cobalt Conc. < 0.00200 < 0.0100 < 0.0200 0.000188 0.00263 0.000491 2
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.010 0.010 0.020 0.030 0.0150 0.0150
Copper Conc. 0.000987 < 0.0250 0.0155 0.0252 0.00263 0.000491 1.3
Zi 1.348 0.381 1.803 1.845 ND25 ND25
Si 0.00 0.00 0.80 2.39 0.00 0.00
Limit* 4 4 4 4 0.0375 0.0375
Iron Conc. 1.02 < 0.500 < 1.00 < 0.100 0.00263 0.000491 NA
Zi 0.5617 0.25 0.617 0.558 ND25 ND25
Si 0.00 0.00 0.000 0.00 0.00 0.00
Limit* 4 4 4 4 0.750 0.750
Lead Conc. < 0.00200 < 0.0100 < 0.0200 < 0.00200 0.00263 0.000491 0.015
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.00500 0.0500 0.00700 0.00700 0.0150 0.0150
Magnesium Conc. 52.4 156 99.4 213 0.00263 0.000491 NA
(undissolved)Zi 1.25 1.10 1.58 0.35 1.500 0.371
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
Manganese Conc. 0.156 0.327 0.398 0.908 0.00263 0.000491 NA
Zi 1.09 0.638 1.16 0.32 0.80 0.30
Si 0.00 0.00 0.00 3.36 0.33 0.00
Limit* 4 4 4 4 4 4
Mercury Conc. < 0.000200 < 0.000200 < 0.000200 < 0.000200 0.00263 0.000491 0.002
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.00100 0.00100 0.00100 0.00100 0.0002 0.0002
Nickel Conc. < 0.00200 < 0.0100 < 0.0200 0.00119 0.00263 0.000491 0.1
Zi 0.898 0.720 0.737 0.831 0.722 3.216
Si 0.00 0.00 0.00 0.00 0.00 2.22
Limit* 4 4 4 4 4 4
Potassium Conc. 25.8 44.9 35 49.3 0.00263 0.000491 NA
(undissolved)Zi 1.27 1.26 1.29 0.27 1.494 0.468
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
24000052.001A/SLC25R177370
© 2025 Kleinfelder
Page 2 of 5 February 20, 2025
MW 4A MW 5A MW 6A MW 7A MW 8B MW 9A SWGQPS
ANALYTE
Comparison of Absolute Concentrations, Normalized Concentrations (Z i ), and
Table 5
Salt Lake Valley Solid Waste Management Facility
Active Landfill Area
Fall 2024
CUSUM Values (S i ) For Downgradient Groundwater Monitoring Wells
Selenium Conc. < 0.00200 < 0.0100 < 0.0200 < 0.00200 0.00263 0.000491 0.05
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.005 0.005 0.005 0.005 0.0175 0.015
Silver Conc. < 0.00200 < 0.0100 < 0.0200 < 0.00200 0.00263 0.000491 0.1
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.020 0.010 0.030 0.010 0.0150 0.0150
Sodium Conc. 1240 2810 2100 2970 0.00263 0.000491 NA
(undissolved)Zi 1.30 1.28 1.52 0.07 1.322 0.207
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
Thallium Conc. < 0.00200 < 0.0100 < 0.0200 < 0.00200 0.00263 0.000491 0.0020
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.00500 0.500 0.00500 0.00500 0.015 0.015
Vanadium Conc. < 0.00500 < 0.0250 < 0.0500 < 0.00500 0.00263 0.000491 0.3
Zi 0.498 ND25 0.497 0.480 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 0.0190 4 4 0.0375 0.0375
Zinc Conc. < 0.0250 < 0.125 < 0.250 0.00794 0.00263 0.000491 5
Zi 0.493 0.466 0.485 0.322 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 0.1875 0.1875
Alkalinity Conc. 174 135 146 121 0.00263 0.000491 NA
Zi 0.411 1.440 1.038 0.24 1.069 1.285
Si 0.00 0.92 0.04 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
Ammonia Conc. 0.581 1.09 1.17 1.69 0.00263 0.000491 NA
Zi 0.86 0.072 0.95 0.65 1.366 0.669
Si 0.00 0.00 0.00 0.00 2.44 0.00
Limit* 4 4 4 4 4 4
Bicarbonate Conc. 174 135 146 121 0.00263 0.000491 NA
Zi 0.400 1.359 1.019 0.25 1.069 1.285
Si 0.00 0.75 0.02 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
OTHER COMPOUNDS
24000052.001A/SLC25R177370
© 2025 Kleinfelder
Page 3 of 5 February 20, 2025
MW 4A MW 5A MW 6A MW 7A MW 8B MW 9A SWGQPS
ANALYTE
Comparison of Absolute Concentrations, Normalized Concentrations (Z i ), and
Table 5
Salt Lake Valley Solid Waste Management Facility
Active Landfill Area
Fall 2024
CUSUM Values (S i ) For Downgradient Groundwater Monitoring Wells
Carbonate Conc. < 20.0 < 20.0 < 20.0 < 20.0 0.00263 0.000491 NA
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 10 10 10 10 20 20
Chloride Conc. 10.4 5900 3960 6370 0.00263 0.000491 NA
Zi 3.41 0.480 1.60 0.38 0.041 0.974
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
COD Conc. 58.2 168 < 100 269 0.00263 0.000491 NA
Zi 0.232 0.28 0.534 0.761 1.292 0.390
Si 0.00 0.00 0.00 2.34 0.00 0.00
Limit* 4 4 4 4 4 4
Nitrate Conc. < 0.500 < 1.00 < 1.00 < 1.00 0.00263 0.000491 NA
Zi 0.639 0.775 0.548 0.472 0.906 6.108
Si 0.00 0.00 0.00 0.00 0.00 6.24
Limit* 4 4 4 4 4 4
Nitrite Conc. < 0.500 < 1.00 < 1.00 < 1.00 0.00263 0.000491 NA
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.010 0.020 0.010 0.010 1.5 1.0
Phenols Conc. < 0.0400 < 0.0400 < 0.0400 < 0.0400 0.00263 0.000491 NA
Zi ND25 ND25 ND25 ND25 ND25 ND25
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 0.050 0.050 0.050 0.050 0.094 0.040
Sulfate Conc. 4.79 368 251 314 0.00263 0.000491 NA
Zi 6.028 0.173 1.50 0.23 0.784 1.813
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
TDS Conc. 3640 9180 8440 12900 0.00263 0.000491 NA
Zi 1.45 1.58 1.12 0.72 0.754 0.040
Si 0.00 0.00 0.00 0.00 0.00 0.00
Limit* 4 4 4 4 4 4
TOC Conc. 0.981 0.346 0.921 0.606 0.00263 0.000491 NA
Zi 0.320 2.303 ND25 1.1 1.346 0.557
Si 0.00 0.00 0.00 0.0 0.00 0.00
Limit* 4 4 1 4 4 4
24000052.001A/SLC25R177370
© 2025 Kleinfelder
Page 4 of 5
February 20, 2025
MW 4A MW 5A MW 6A MW 7A MW 8B MW 9A SWGQPS
ANALYTE
Comparison of Absolute Concentrations, Normalized Concentrations (Z i ), and
Table 5
Salt Lake Valley Solid Waste Management Facility
Active Landfill Area
Fall 2024
CUSUM Values (S i ) For Downgradient Groundwater Monitoring Wells
Notes
Conc. = Absolute concentration (in milligrams per liter)
SWGQPS = Solid Waste Groundwater Quality Protection Standards
ND25 = Analyte reported in fewer than 25% of historical samples
NA = Not applicable, no SWGQPS established for this constituent
BLUE = Indicates parameter exceeded control limit for Zi or Si
COD = Chemical oxygen demand
TDS = Total dissolved solids
TOC = Total organic carbon
* = Limits are based on detection. If the analyte is ND25 the limit is set at the highest concentration reported in
24000052.001A/SLC25R177370
© 2025 Kleinfelder
Page 5 of 5 February 20, 2025
MW 9A DUP 1
Antimony 0.0 < 0.00400 NA
Arsenic 0.00181 0.00169 6.86
Barium 0.0589 0.0596 1.18
Beryllium < 0.00200 < 0.00200 NA
Cadmium 0.000129 0.00013 0.77
Calcium 442 423 4.39
Chromium < 0.00200 < 0.00200 NA
Cobalt 0.00286 0.00317 10.28
Copper 0.02640 0.02880 8.70
Iron < 0.100 < 0.100 NA
Lead < 0.00200 < 0.00200 NA
Magnesium 194 190 2.08
Manganese 0.572 0.568 0.70
Mercury < 0.000200 < 0.000200 NA
Nickel 0.1900 0.1920 1.05
Potassium 66.7 64.9 2.74
Selenium < 0.00200 < 0.00200 NA
Silver < 0.00200 < 0.00200 NA
Sodium 3,240 3,060 5.71
Thallium 0.000151 0.000171 12.42
Vanadium 0.00070 0.00059 17.87
Zinc < 0.0250 < 0.0250 NA
Alkalinity 306 310 1.30
Ammonia 0.36 0.28 26.77
Bicarbonate 306 310 1.30
Carbonate < 20.0 < 20.0 NA
Chloride 5,680 5,640 0.71
COD 229 208 9.6
Nitrate 3.38 2.99 12.24
Nitrite < 1.00 < 1.00 NA
Phenolics < 0.0400 < 0.0400 NA
Sulfate 550 471 15.48
TDS 11,400 11,300 0.88
TOC 3.14 2.97 5.56
VOCs All <RDL All <RDL NA
Notes
RDL = Reporting Detection Limit
NA
< = Indicates the concentration is less than the RDL
Bold = RPD exceeds the EPA guideline of 20%
TDS = total dissolved solids
TOC = total organic carbon
VOCs = volatile organic compounds
Active Duplicate
Well MW 9A
Table 6
Summary of Quality Control Results
Salt Lake Valley Solid Waste Management Facility
Active Landfill Area
Fall 2024
Analyte
= RPD not calculated for this parameter because
one or both samples were less than the RDL
INORGANIC PARAMETERS (mg/L)
Relative Percent
Difference (RPD)
ORGANIC PARAMETERS (mg/L)
DISSOLVED METALS (mg/L)
24000052.001A/SLC25R177370
© 2025 Kleinfelder
Page 1 of 1 February 20, 2025
0 1 2
SCALE IN MILES£Aerial: ESRI World Street Map.
The information included on this graphic representation has been compiled from a variety of
sources and is subject to change without notice. Kleinfelder makes no representations or
warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of
such information. This document is not intended for use as a land survey product nor is it
designed or intended as a construction design document. The use or misuse of the information
contained on this graphic representation is at the sole risk of the party using or misusing the information.
SITE VICINITY MAP
SALT LAKE VALLEY
SOLID WASTE MANAGEMENT FACILITY
ACTIVE LANDFILL
SALT LAKE COUNTY, UTAH
PROJECT NO.
FILE NAME:
FIGURE
1
DRAWN:
CHECKED BY:
DRAWN BY:
20180434
SEP 2017
DP
KFH
Fig1_Active_Spring17.mxd
Salt Lake Valley Solid
Waste Management Facility
24000052PROJECT NO
DRAWN
DRAWN BY
CHECKED BY
25000032
SEP 2017
KFH
DP
24000052.001A/SLC25R177370 February 20, 2025
© 2025 Kleinfelder www.kleinfelder.com
APPENDIX A

FIELD DATA SHEETS

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24000052.001A/SLC25R177370 February 20, 2025
© 2025 Kleinfelder www.kleinfelder.com
APPENDIX B
LABORATORY ANALYTICAL REPORTS