DERR-2024-010638

Stantec Consulting Services Inc.
2890 East Cottonwood Parkway
Suite 300
Salt Lake City UT 84121-7283
September 10, 2024
Project/File: 203723606/CPL Site Characterization
David Bird
DERR – VCP Group
[e-mail]
Greetings David,
Reference: Additional Off-Site GW Characterization Sampling – CPL VCP
WORK PLAN – ADDITIONAL OFF-SITE GROUNDWATER CHARACTERIZATION
INTRODUCTION
Site Characterization activities in December 2023 and January 2024 included the sampling and analysis
of the shallow Groundwater within the CPL from existing wells, sampling and analysis of the soil vapor
within the CPL, sampling and analysis of the surface water and sediment within the Lee Drain, located to
the south of the CPL, sampling and analysis of eight new offsite well locations, and the sampling of three
new well locations within the CPL, two of which were at depths approximately 40 feet below surface.
These two new locations (MW-47d and MW-48d) were installed to collect GW samples within the deeper
GW beneath the CPL. A third location was a shallow well (MW-46) along the downgradient western
perimeter to satisfy DERR’s request to provide additional GW data along the downgradient southwest
boundary. Groundwater elevation data was collected from all the sampled wells, and an updated
groundwater potentiometric map was developed. The attached proposed additional off site sampling
location map shows the updated December 2023 groundwater contours.
The 2023 new offsite wells were primarily located further downgradient in a northwesterly direction, with
three additional wells: one well located approximately 350 feet to the north (MW-39) and a second
additional well located 1,600 feet to the west (MW-42p), with a third additional well located 350 feet to the
southeast of the CPL (MW-38). DERR was provided with the preliminary data including the new updated
2023 GW potentiometric groundwater contour map. Based on subsequent discussions with DERR on the
results of the data and GW gradients, it was determined that additional offsite data to address data gaps
offsite and downgradient from the CPL boundary was necessary. This was necessary to address the
current radial potentiometric contours at the CPL. Collection of these data would be necessary to identify
the extents or limits on the impacts to the groundwater along the boundary in the downgradient directions.
DERR requested concentrations exceeding the project screening levels (PSLs) be identified along the
boundary where the groundwater gradients are moving away from the CPL or in a downgradient direction.
The December 2023 GW contours show mounding of higher groundwater levels in the central area of the
CPL, resulting in a more pronounced radial gradient compared to historical potentiometric contour
mapping indicating the gradient direction to be primarily to the northwest. The reasons for this more radial
gradient of GW are not fully understood at this time. Conditions which are understood include the nature
September 10, 2024
David Bird
Page 2 of 5
Reference: Additional Off-Site Site Characterization Sampling

of the past landfilling operations; and the former waste trench depressions throughout the CPL
topography, which captured and retained the stormwater runoff within the multiple shallow trench cells
thus avoiding any runoff water leaving the site. Past operations managed and discharged the run on and
run off surface water. Since operations have ceased, the water does not discharge offsite. The very loose
nature of the waste within the trenches over top of lower permeable native soils retains water onsite
during the wet months of the year. Another factor more recent is the discontinuation of the water
conveyance through the Ridgeland Canal, which was relocated in the past, from the eastern extent of the
landfill trenches to the current location along the western boundary of 4800 West, east of the CPL. During
seasonal use of the Ridgeland Canal for conveyance of irrigation water, the onsite GW monitoring wells
indicated higher GW elevations when compared to those further west and within the former landfill. This
could indicate a recharge to the eastern area of the CPL resulting in a less predominate mounding effect
compared to the more recently observed lower and easterly gradients along the east during a wetter
seasonal time of the year combined with the higher precipitation cycle during the past several years.
EAST AREA
Regarding the easterly groundwater direction in the eastern portion of the CPL, there does not appear to
be impacts along the boundary in the northeast area nor the east area other than a low detection of
hexavalent chromium along the Ridgeland Canal and low PFAS concentrations below the MCLs. This is
attributed to the buffering of the farmland area which did not include any landfill operations between the
CPL and the sites eastern boundary.
Northeast Area
The proposed location of MW-52P is located along the northern boundary and 350 feet to the north of the
eastern extent of the landfill cells along the northern boundary. The location is proposed to capture any
movement of groundwater from the landfill in a northern or northeast direction from the former areas of
waste cells. The GW will be sampled for PRIORITY POLLUTANT 13 metals, 8260 VOCs, 1,4 dioxane
(8270 SIM), 8270 SVOCs, DRO and PFAS. In the north central area of the CPL there are impacts on the
northern boundary, as indicated in MW-5. Due to the radial gradient of the mounding in landfill areas to
the north, there is a data gap offsite to the north. Proposed wells, MW-52P (discussed above) and MW-
53P, further to the west are proposed to provide data to address this off-site data gap to the north. MW-
53P is discussed below in the Northwest Area section.
Southeast Area
The impacts to the southeast perimeter area, although lower than compared to the western boundaries
shown elevated levels of arsenic, a single detection of hexavalent chromium, elevated DRO and PFAS
over the MCLs. The existing GW monitoring wells 150 feet off site to the south (PZ-05 through PZ-08) do
not show impacts from the CPL. The Lee Drain is a regional drainage channel and is located between the
CPL and the offsite wells PZ-05 through PZ-08. PZ-09 was previously located southwest of the CPL and
was destroyed during recent redevelopment and was not sampled. The new proposed off-site MW-49P is
proposed for monitoring this area to the southwest of the CPL. Access to the area of the former PZ-09
was difficult and not obtained. More information regarding the proposed GW monitoring off site in the
southwest area is discussed in more detail below.
September 10, 2024
David Bird
Page 3 of 5
Reference: Additional Off-Site Site Characterization Sampling

WEST AREA
This leaves the area to the southwest and northwest for consideration.
Southwest Area
Due to the loss of PZ-09 during redevelopment activities, combined with a number of the highest
concentrations of GW impacts along the southwest area, additional data are necessary on the off-site
areas to the southwest. Proposed well MW-49P will provide data to address this off-site data gap. MW-
49P is proposed for location on UDOT’s parcel associated with the Mountain View Corridor and California
interchange. An encroachment permit and bond were obtained to access this location.
The 2023 new MW-42P located 1,600 feet west of the southwest area of the CPL did not show impacts to
the groundwater. A new proposed MW-50P is proposed six hundred feet downgradient form the CPL to
determine the level and extent of impacts closer to the elevated levels along the CPL downgradient
boundary. Both MW-49P and MW-50P will include analysis for PRIORITY POLLUTANT 13 metals, 8260
VOCs, DRO, GRO, 8270 SVOCs, 1,4-dioxane SIM 8270, and PFAS.
Northwest Area
To address the areas to the northwest, MW-53P is located between the 2023 new well CPL MW-39 and
the new proposed well MW-52P, located further east. Although MW-39 did not show any significant
impacts to the GW (low 1,4 dioxane); and similarly with MW-41 further west off the northwest corner of
the CPL, the analytes proposed in the new well MW-53P will include PRIORITY POLLUTANT 13 metals,
hexavalent chromium, nickel, 8260 VOCs, DRO, GRO1,4-dioxane SIM 8270, 8270 SVOCs and PFAS.
This will address the elevated levels along the northwest boundary in wells MW-2, MW-5, and MW-6.
Recent monitoring of new wells within the off-site areas further west in MW-43 and MW-44 (1,600 feet)
and northwest in MW-40 and MW-45 (3,400 feet) downgradient, do not exhibit GW impacts. Therefore, it
is necessary to locate the level and extent of the boundary impacts seen along the CPL western
boundary between the boundary and these further downgradient wells showing non-detection of
contamination. It is proposed to collect GW samples for analysis in the proposed locations of MW-51P to
identify the extent of the downgradient impacts to the west areas of the CPL. The analytes proposed in
the new well MW-51P will include PRIORITY POLLUTANT 13 metals, hexavalent chromium, nickel, 8260
VOCs, DRO, GRO, 1,4-dioxane SIM 8270, 8270 SVOCs, and PFAS.
Surface Water
The sampling and analysis of the surface water in all the Lee Drain locations (SW-07, SW-09, and SW-
10) has shown low but consistent levels of PFAS compounds over their PSLs. This includes the farthest
upgradient location (SW-07) located southeast of the California Ave. and 4800 West intersection. The
recent GW contours show a downgradient direction from the CPL to SW-07. Therefore, it is proposed to
collect a SW sample (SW-12P) farther upgradient along the Lee Drain approximately 1,200 feet from SW-
07. The upgradient reaches of the Lee Drain include a large area of industrial operations. The water will
be sampled and analyzed for EPA PRIORITY POLLUTANT 13 metals, hexavalent chromium, nickel,
September 10, 2024
David Bird
Page 4 of 5
Reference: Additional Off-Site Site Characterization Sampling

gasoline range organics (GRO) and diesel range organics (DRO), total recoverable petroleum
hydrocarbons (TRPH), volatile organic Compounds (VOCs), semi-volatile organic compounds (SVOCs)
and PFAS compounds. The analytes include those same compounds and methods collected in the 2023
characterization sampling and analysis for SW-7, SW-9, SW-10. The locations of SW-8 and SW-11 were
not sampled in 2023 due to the Ridgeland Canal being dry.
Methane Monitoring
It is also proposed to include field air monitoring of the perimeter of the landfill for explosive levels of
methane gas. This will be conducted by walking the perimeter with a handheld gas meter. The soil gas
methane gas level in SV-4 in December 2023 was previously measured by the laboratory to be at 13% of
the lower explosive limit. Methane gas levels between 5% and 17% will support ignition and are
considered highly flammable. The other soil vapor wells did not report to be within the 5% to 17% of the
methane explosive limits. The 13% level was measured from within a soil gas vapor probe greater than 5
ft below the ground surface. The probe tubing is sealed and within a secured locked well head cover.
There has not been any detection of explosive methane levels at the surface during measurements of the
soil vapor probes.
In summary it is proposed to install five new shallow GW monitoring wells (MW-49P through MW-53P)
and collect one new location for SW from within the Lee Drain (SW-12P) and collect surface
measurement of methane gas around the perimeter of the landfill. Additionally, an entire well network of
depth to groundwater levels will be collected to develop the groundwater potentiometric contours for the
month of September. All proposed well locations will be surveyed for elevations and be cleared for utilities
through notification to Bluestakes and by subcontracted ground penetrating radar investigations prior to
drilling.
QUALITY ASSURANCE QUALITY CONTROL
This additional site characterization sampling and analysis identified in this work plan will follow the
pertinent and relevant sampling and analysis procedures and methods as provided to DERR in the
Supplemental Characterization of Groundwater, Surface Water, Sediment, Soil, Soil Vapor – Sampling
and Analysis Plan for the Former Cannon Pioneer Landfill, dated December 5, 2023, and the Quality
Assurance Project Plan for Remedial Investigation Design and Action at the Cannon Pioneer Landfill,
dated May 9, 2023.

Thank you,
STANTEC CONSULTING SERVICES INC.

September 10, 2024
David Bird
Page 5 of 5
Reference: Additional Off-Site Site Characterization Sampling

David K. Cline P.E.
Senior Environmental Engineer
Phone: Direct [phone]
[e-mail]

Attachment: Figure 2a Proposed Sample Location Map July 2024 exceedances.
CPL VCP Well Group Summary with Proposed 2024 GW sampling locations

cc: Bill Rees - DERR
Luke Rothey – PRI
Loyal Hume – KMC
Mary Cunningham – PRI
Ryan Wallace - KMC

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JANUARY 2024 GROUNDWATER
ELEVATION CONTOURS, FEET
ABOVE MEAN SEA LEVEL (AMSL)
JANUARY 2024 INFERRED
GROUNDWATER ELEVATION
CONTOURS, FEET AMSL
PROJECT SCREEING LEVELS (PSL)
(FOR COMPOUNDS EXCEEDING PSLs)
PFOS = 4 ng/L
PFOA = 4 ng/L
ARSENIC (As) = 10 mg/L
HEXAVALENT CHROMIUM (Cr6) = 0.035 mg/L
NICKEL (Ni) = 390 mg/L
DIESEL RANGE ORGANICS (DRO) = 1000 mg/L
GASOLINE RANGE ORGANICS (GRO) = 1000 mg/L
1,4 DIOXANE = 0.46 mg/L
BENZENE = 5 mg/L
ETHYLBENZENE = 700 mg/L
VINYL CHLORIDE (VC) = 2 mg/L
N-NITROSODIPHENYLAMINE = 12 mg/L
BIS(2-ETHYLHEXYL)PHTHALATE = 6 mg/L
NOTES:
ND = NON-DETECT
mg/L = Micrograms per liter
ng/L = Nanograms per liter
J =
PFOS: 23 ng/L
PFOA: 8 ng/L
PFOS: ND
PFOA: ND
PFOS: ND
PFOA: ND
PFOS: ND
PFOA: ND
PFOS: ND
PFOA: ND
As: 133 mg/L
PFOS: 39 ng/L
PFOA: 176 ng/L
1,4-Dioxane: 68 mg/L
DRO: 5050 mg/L
As: 42 mg/L
PFOS: 11 ng/L
PFOA: 5 ng/L
DRY
PFOS: ND
PFOA: 1 ng/L
As: 68 mg/L
PFOS: 2 ng/L
PFOA: 3 ng/L
PFOS: ND
PFOA: 13 ng/L
As: 23 mg/L
PFOS: 41 ng/L
PFOA: 137 ng/L
1,4-Dioxane: 174 mg/L
DRO: 1370 mg/L
As: 730 mg/L
PFOS: 51 ng/L
PFOA: 281 ng/L
1,4-Dioxane: 51 mg/L
As: 38 mg/L
PFOS: 28 ng/L
PFOA: 109 ng/L
1,4-Dioxane: 32 mg/L
As: 17 mg/L
PFOS: 32 ng/L
PFOA: 124 ng/L
1,4-Dioxane: 38 mg/L
VC: 6 mg/L
PFOS: 36 ng/L
PFOA: 417 ng/L
1,4-Dioxane: 40 mg/L
Cr6: 1 mg/L
DRO: 1510 mg/L
Benzene: 7 mg/L
1,4-Dioxane: 39 mg/L
As: 194 mg/L
PFOS: 446 ng/L
PFOA: 505 ng/L
DRO: 5460 mg/L
GRO: 3640 mg/L
1,4-Dioxane: 256 mg/L
Ethylbenzene: 1490 mg/L
N-Nitrosodiphenylamine: 40 mg/L
Bis(2-Ethylhexyl)Phthalate: 11 mg/L
PFOS: 103 ng/L
PFOA: 371 ng/L
1,4-Dioxane: 29 mg/L
DRO: 2680 mg/L
As: 366 mg/L
PFOS: 15 ng/L
PFOA: 5 ng/L
PFOS: 194 ng/L
PFOA: 158 ng/L
1,4-Dioxane: 37 mg/L
DRO: 1790 mg/L
As: 145 mg/L
PFOS: 35 ng/L
PFOA: 49 ng/L
1,4-Dioxane: 5 mg/L
PFOS: 178 ng/L
PFOA: 592 ng/L
1,4-Dioxane: 46 mg/L
DRO: 4150 mg/L
As: 543 mg/L
PFOS: ND
PFOA: ND
PFOS: ND
PFOA: ND
PFOS: ND
PFOA: 1 ng/L
PFOS: ND
PFOA: ND
As: 12 mg/L
PFOS: ND
PFOA: ND
1,4-Dioxane: 5 mg/L
PFOS: 307 ng/L
PFOA: 192 ng/L
DRO: 2330 mg/L
1,4-Dioxane: 44 mg/L
VC: 8 mg/L
As: 154 mg/L
Ni: 569 mg/L
PFOS: ND
PFOA: ND
1,4-Dioxane: 2 mg/L
PFOS: 362 ng/L
PFOA: 235 ng/L
1,4-Dioxane: 59 mg/L
As: 313 mg/L
Cr6: 0.3 mg/L
PFOS: 74 ng/L
PFOA: 72 ng/L
1,4-Dioxane: 14 mg/L
As: 16 mg/L
Cr6: 2 mg/L
PFOS: 54 ng/L
PFOA: 113 ng/L
1,4-Dioxane: 58 mg/L
PFOS: 164 ng/L
PFOA: 160 ng/L
1,4-Dioxane: 74 mg/L
DRO: 1080 mg/L
As: 28 mg/L
As: 101 mg/L
PFOS: 402 ng/L
PFOA: 176 ng/L
1,4-Dioxane: 14 mg/L
DRO: 1600 mg/L
As: 358 mg/L
PFOS: ND
PFOA: ND
As: 10 mg/L
PFOS: 1 ng/L
PFOA: 14 ng/L
1,4-Dioxane: 5 mg/L
As: 152 mg/L
PFOS: 6 ng/L
PFOA: 49 ng/L
1,4-Dioxane: 9 mg/L
As: 58 mg/L
DRY
As: 22 mg/L
Cr6: 0.215J mg/L
PFOS: 3 ng/L
PFOA: 4 ng/L
As: 28 mg/L
PFOS: 1 ng/L
PFOA: 5 ng/L
As: 22 mg/L
Cr6: 3 mg/L
The identification of the analyte is acceptable;
the reported value is an estimate
Areas of higher concentrations
SURFACE WATER
SAMPLE LOCATIONS
CPL-SW11
SEDIMENT SAMPLE
LOCATIONS
CPL-SE11
Proposed 2024 Groundwater Monitoring Wells
Proposed 2024 Surface Water Sampling
P-SW12
P-51
P-50
P-49
P-52P-53
SUB-AREA TOTAL 42 WELLS PSL (ug/L)
Southeast Perimeter 4-WELLS MW 21 MW 22 MW 23 MW 27
AS 10 23 42 730 22
Cr6 0.035 <0.15 <0.15 <0.15 3.2
1,4 dioxane SIM 0.46 <0.597 68 174 <0.597
DRO 1000 <24.7 5050 1370 <24.7
PFOS 4 ND 39 41 1
PFOA 4 13 176 137 5
Southeast (150 feet south)4-WELLS MW 38 P5 P6 P7
1,4 dioxane SIM 0.46 68 6 133 25
DRO 1000 171 NA NA 77
PFOS 4 ND 2 ND ND
PFOA 4 1 3 ND ND
Northeast Perimeter 3-WELLS MW 28 MW 29 MW 30
AS 10 28 22 10
Cr6 0.035 <0.15 0.2 <0.15
PFOS 4 3 NA ND
PFOA 4 4 NA ND
Northeast Interior 3-WELLS MW 26 MW 36 MW 37
AS 10 152 58 358
1,4 dioxane SIM 0.46 5 9 14
DRO 1000 <24.7 364 1600
PFOS 4 1 6 402
PFOA 4 14 49 176
Northeast (350 feet north)1-WELLS MW 52P
Priority Pollutant 13 Metals MCL √
VOCs (8260)MCL/RSL/ISL √
1,4 dioxane SIM (8270)0.46 √
DRO 1000 √
SVOCs (8270)MCL/RSL/ISL √
PFOS 4 √
PFOA 4 √
Southwest Perimeter 7-WELLS MW 8E MW 9E MW 24 MW 25 MW 34 MW 46 MW 47D
AS 10 543 622 38 52 17 366 4.26
Cr6 0.035 <0.15 <0.15 <0.15 0.22 <0.15 <0.15 <0.15
1,4 dioxane SIM 0.46 46 55 51 256 32 29 5
DRO 1000 4150 3190 599 5460 472 2680 931
GRO 1000 147 36 <31.4 3640 <31.4 59 39
ethybenzene 700 1.25 <0.137 0.396 1490 <0.137 <0.137 <0.137
N-Nitrosodiphenylanine 12 4.6 <2.37 <23.7 40 <2.37 <0.261 <0.261
Bis(2-Ethylhexyl)Phtaalate 6 <0.895 <0.895 <0.895 11 <0.895 <0.895 <0.895
PFOS 4 178 49 51 446 28 103 35
PFOA 4 592 354 281 505 109 371 49
Southwest Interior 3-WELLS MW 33 MW 35 MW 48D
AS 10 4.12 194 3.27
Cr6 0.035 1.3 <0.15 <0.15
1,4 dioxane SIM 0.46 40 39 38
benzene 5 0.245 6.7 0.755
VC 2 <0.234 0.922 6
DRO 1000 554 1510 931
PFOS 4 36 51 32
PFOA 4 477 214 124
Southwest (150 feet south)1-WELLS P8
AS MCL 16
1,4 dioxane SIM 0.46 <0.597
DRO 1000 33
GRO 1000 <31.4
PFOS 4 ND
PFOA 4 ND
Southwest (350 feet southwest)1-WELLS MW 49P
Priority Pollutant 13 Metals MCL √
VOCs (8260)MCL/RSL/ISL √
1,4 dioxane SIM (8270)0.46 √
DRO 1000 √
GRO 1000 √
SVOCs (8270)MCL/RSL/ISL √
PFOS 4 √
PFOA 4 √
Southwest 600 feet west 1-WELLS MW 50P
Priority Pollutant 13 Metals MCL √
VOCs (8260)MCL/RSL/ISL √
1,4 dioxane SIM (8270)0.46 √
DRO 1000 √
GRO 1000 √
SVOCs (8270)MCL/RSL/ISL √
PFOS 4 √
PFOA 4 √
Southwest 1600 feet west 1-WELLS MW 42P
PFOS 4 ND
PFOA 4 ND
Northwest Perimeter 4-WELLS MW 2 MW 5 MW 6 MW 7E MW 31
AS 10 101 28 16 154 145
Cr6 0.035 <0.15 <0.15 2.4 <0.15 <0.15
Ni 390 89 63 44 569 99
1,4 dioxane SIM 0.46 58 74 14 44 37
VC 2 1.5 <0.234 <0.234 8 0.243
DRO 1000 726 1080 168 2330 1790
PFOS 4 54 164 74 307 194
PFOA 4 113 160 72 192 158
Northwest Interior 1-WELLS MW 32
AS 10 313
Cr6 0.035 0.33
1,4 dioxane SIM 0.46 14
PFOS 4 362
PFOA 4 235
Northwest (350 feet north)2-WELLS MW 39 MW 41
1,4 dioxane SIM 0.46 2 5
PFOS 4 ND ND
PFOA 4 ND ND
Northwest (350 feet west)1-WELLS MW 51P
Priority Pollutant 13 Metals MCL √
Cr6 0.035 √
Ni 390 √
VOC 8260 MCL/RSL/ISL √
1,4 dioxane SIM 8270 0.46 √
DRO 1000 √
GRO 1000 √
SVOCs (8270)MCL/RSL/ISL √
PFOS 4 √
PFOA 4 √
Northwest (350 feet north)1-WELLS MW 53P
Priority Pollutant 13 Metals MCL √
Cr6 0.035 √
Ni 390 √
1,4 dioxane SIM 8270 0.46 √
VOC 8260 MCL/RSL/ISL √
DRO 1000 √
GRO 1000 √
SVOCs (8270)MCL/RSL/ISL √
PFOS 4 √
PFOA 4 √
Northwest (1600 feet west)2-WELLS MW 43 MW 44
PFOS 4 ND ND
PFOA 4 ND ND
Northwest (3400 feet north)2-WELLS MW 40 MW 45
PFOS 4 ND ND
PFOA 4 ND 1
ND (non detect); NA (not analyzed)
Where no detections were over the Project Screening Level (PSL) for the well grouping, no results are
shown.
√ indicates Proposed analyte list for the new proposed off site well
NOTES
Study Area - Detections
Well LocationsAREA
NO
R
T
H
W
E
S
T
SO
U
T
H
W
E
S
T
EA
S
T