DSHW-2024-005722

1761 Bluff Ridge Dr. Suite 105, Syracuse UT 84075 * 801-918-5107

March 6, 2024

Bryan Watt, Environmental Scientist
State of Utah Department of Environmental Quality
Division of Waste Management and Radiation Control
195 North 1950 West
Salt Lake City, Utah 84116

Re: D/W Bluebench Landfill Facility – Class IVa Disposal Cell Waste Placement Approval

Dear Mr. Watt,

This correspondence represents the efforts made by the referenced Landfill Facility to
demonstrate compliance with UAC R315-303-3 Standards of Design (Rule). As in previous
Class IVa disposal cells, the operator of the landfill will continue to minimize liquids
admitted to active areas as outlined in the Rule. An exemption from a leachate collections
system is being requested as the cell is being proposed without the installation of liners,
which is consistent with previous onsite Class IV disposal cells. The site is located in a very
arid and dry climate, and historically the leachate generation (even in the much larger lined
MSW disposal cells) has been very minimal.

The liner design proposed for this disposal cell is an equivalent design using existing in-situ
soils beneath the proposed disposal cell. Four samples of the onsite clay were sampled by a
representative of SWTI and delivered to GeoStrata’s Bluffdale accredited laboratory for
testing. An exploration map showing the locations of where the samples were taken is
provided in Appendix A.

The laboratory testing program conducted by GeoStrata was designed to identify the
engineering characteristics of onsite earthen materials beneath the proposed landfill cell
footprint. The laboratory tests conducted for this program included the following:

Grain Size Distribution Analysis (ASTM D422)
Material Passing the 200 Sieve (ASTM D422)
Hydraulic Conductivity of Porous Material (ASTM D5856)

Laboratory results are presented in Appendix B with a summary table provided below.

1761 Bluff Ridge Dr. Suite 105, Syracuse UT 84075 * 801-918-5107

Sample Sample
Depth
(ft)
Passing
No. 200
Sieve
(%)
Dry
Density
(pcf)
Moisture
Content
(%)
Liquid
Limit
(%)
Plastic
Index
(%)
Hydraulic
Conductivity
(cm/sec)
TP-1 0-4 81.4 105.6 12.9 49 19 5.99X10-7
TP-2 0-4 88.3 106.3 16.9 54 26 7.55X10-8
TP-3 0-4 80.3 99.0 19.1 49 21 9.11X10-9
TP-4 0-4 82.0 108.4 13.5 49 21 6.60X10-8

The following interpretation of the testing results was provided by GeoStrata. “The native
soils as sampled have between 80.3 and 88.3 percent fines, so the soils are made up of soil
particles that classify as silt or clay. The Atterberg test results, liquid limit, and plasticity
index, indicate that on-site fine-grained soils are plastic soils with liquid limits above 40
percent moisture content. The results of the liquid limit and plasticity index numbers are
similar with values between 49 and 54 percent of the liquid limit and 19 and 26 percent for
the plasticity index. The plotted points of the Atterberg limit tests are very close to the A-
Line and from this the soil is likely to exhibit properties of both Silts and Lean Clays or in
the case of the TP-2 sample a Fat Clay, but all samples tested are close to the 50 percent area.
The samples were tested for natural densities and moisture contents, so the samples could be
remolded into the testing apparatus for obtaining hydraulic conductivity tests. The results of
the hydraulic conductivity tests show that water moves very slowly through the saturated
samples. The results in the table are provided in centimeters per second and the results range
from 0.0003 to 0.02 inches per day.”

Based on the laboratory testing results, waste characterization of construction debris, and the
arid conditions at the site, it is our opinion that existing soils are suitable as an equivalent
design. As such, the Landfill Facility is requesting approval for an equivalent design.

At closure, the Landfill Facility will use either the standard design outlined in the Rule or the
approved alternative final cover design. The Landfill Facility will continue to monitor gas
quarterly as per the Rule. Design drawings have been attached in Appendix C. At this time,
the groundwater network and program will remain the same.

We are requesting the Division of Waste Management and Radiation Control to review the
information provided and grant approval for use of this disposal cell with equivalent design
to begin accepting and disposing Class IV waste. We appreciate all your efforts on this
matter.

Sincerely,
Solid Waste Training Institute

Chet Hovey, PE
Director

APPENDIX A

Site Map

Copyright, 2024
Advanced Enviromental Engineering
Blue Bench Landfill
Duchesne, UT
Project Number: 1796-002
Plate
A-1
Exploration Location Map
Approximate Test Pit Locations
Approximate Site Boundary
Legend

APPENDIX B

Laboratory Results
TP-1 TESTS
Project:
Project Number:Initial Final
Soil Classification:2.65 2.65
Sample Location:383.3 383.3
Test Date:7.0 7.0
Permeant Liquid:6.4 6.4
38.8 38.8
273.0 273.0
14.0 38.6
107.5 107.5
69 190
Recorded Time Elapsed Time
(sec)k (cm/sec)Temp
(°C)
Viscocity
Ratio, Rf
k20
(cm/sec)
9:12:00 960 7.6E-07 24.5 0.889 6.79E-07
9:29:00 1020 6.9E-07 24.5 0.889 6.14E-07
9:53:00 1440 6.2E-07 24.5 0.889 5.53E-07
10:37:00 2640 6.2E-07 24.5 0.889 5.53E-07
Average k20 5.99E-07 cm/sec
PROJECT NO.: 1796-002 Sample No.
217269
Sample Area (cm2):
Volume (cm3):
Water Content (%):
Dry Unit Weight, γd (pcf):
Saturation (%):
TP-1 @ 0-4'Mass (g):
1/16/2024 Sample Length (cm):
Water Diameter (cm):
SILT with sand Gs:
Hydraulic Conductivity of Saturated Pourous Materials
Using a Flexible Wall Permeameter
ASTM D5856, Method D
Blue Bench Landfill
1796-002
Copyright GeoStrata , 2024
4.00E-07
4.50E-07
5.00E-07
5.50E-07
6.00E-07
6.50E-07
7.00E-07
7.50E-07
8.00E-07
9:07:12 9:21:36 9:36:00 9:50:24 10:04:48 10:19:12 10:33:36 10:48:00
k20

(c
m
/
s
e
c
)
Time (min)
Plate
B-1
Client:Lab #:
Job #:Date:
Project:Tested By:
Diameter of Soil (in)2.000
Pan Weight:106.7
Height of Soil (in)0.880
Moisture-Density
Wet Weight:
Dry Weight:
193.2
183.3
Material Type:
Sample Location:
AE2
1796-002
Blue Bench Landfill
TP-1 @ 0-4
SILT with sand
217269
Wet Density (pcf)119.2
Moisture Content (%)12.9
Dry Density (pcf)105.6
Plate
B-2
Client:AE2 Lab #217269
Job Number 1796-002 Date Sampled:
Project Blue Bench Landfill Sampled By:Client
Sample Location:TP-1 @ 0-4 Date Received:
Material Type:SILT with sand Received By:
Specimen Preparation:
Liquid Limit Method:
Liquid Limit Plasticity Index
49 19
Atterberg Limits - ASTM 4318
0
10
20
30
40
50
60
0 20 40 60 80 100
Pl
a
s
t
i
c
i
t
y

I
n
d
e
x

(
%
)
Liquid Limit (%)
Plate
B-3
Client Name:Lab #217269
Job Number:Date Sampled:
Project:Sampled By:Client
Sample Location:Date Received:
Material Type:Received By:LAB
AASHTO T 11 ASTM D1140
Wt. Ret.% Ret Cumulativ
e % Ret.% Pass Target Pass/ Fail
#200 102.7 18.61 18.6 81.4
Total - #200 449.2 81.39 100.0 0.0
Total 551.9 100.00
Split Moisture Pan #:
Wet Weight:1156.5 728
Dry Weight:1061.5 653.3 Dry Weight After Wash:612.3
Weight of Water:94.95663 74.7 Weight -#200 Washed:449.243368
Pan Weight:509.6 219.1
Water Content:17.2%17.2%
Weight of Dry Soil 551.9 434.2
1796-002
Blue Bench Landfill
TP-1 @ 0-4
SILT with sand
Percentage of Soil Finer than #200 Sieve
AE2
Plate
B-4
TP-2 TESTS
Project:
Project Number:Initial Final
Soil Classification:2.65 2.65
Sample No.:397.9 397.9
Test Date:6.5 6.5
Permeant Liquid:6.4 6.4
33.3 33.3
217.0 217.0
14.0 37.9
120.4 120.4
99 269
Recorded Time Elapsed Time
(sec)k (cm/sec)Temp
(°C)
Viscocity
Ratio, Rf
k20
(cm/sec)
12:18:00 3300 7.7E-08 21 0.976 7.52E-08
12:48:00 1800 7.8E-08 21 0.976 7.65E-08
13:47:00 3540 7.8E-08 21 0.976 7.62E-08
14:30:00 2580 7.6E-08 21 0.976 7.39E-08
Average k20 7.55E-08 cm/sec
PROJECT NO.: 1796-002 Sample No.
217270
Sample Area (cm2):
Volume (cm3):
Water Content (%):
Dry Unit Weight, γd (pcf):
Saturation (%):
TP-2 @ 0-4'Mass (g):
1/26/2024 Sample Length (cm):
Water Diameter (cm):
Fat CLAY Gs:
Hydraulic Conductivity of Saturated Pourous Materials
Using a Flexible Wall Permeameter
ASTM D5856, Method D
Blue Bench Landfill
1796-002
Copyright GeoStrata , 2024
6.00E-08
6.50E-08
7.00E-08
7.50E-08
8.00E-08
8.50E-08
9.00E-08
12:00:00 12:28:48 12:57:36 13:26:24 13:55:12 14:24:00 14:52:48
k20

(c
m
/
s
e
c
)
Time (min)
Plate
B-5
Client:Lab #:
Job #:Date:
Project:Tested By:
Diameter of Soil (in)1.348
Pan Weight:96.6
Height of Soil (in)0.610
Moisture-Density
Wet Weight:
Dry Weight:
125
120.9
Material Type:
Sample Location:
AE2
1796-002
Blue Bench Landfill
TP-2 @ 0-4
Fat CLAY
217270
Wet Density (pcf)124.2
Moisture Content (%)16.9
Dry Density (pcf)106.3
Plate
B-6
Client:AE2 Lab #217270
Job Number 1796-002 Date Sampled:
Project Blue Bench Landfill Sampled By:Client
Sample Location:TP-2 @ 0-4 Date Received:
Material Type:Fat CLAY Received By:
Specimen Preparation:
Liquid Limit Method:
Liquid Limit Plasticity Index
54 26
Atterberg Limits - ASTM 4318
0
10
20
30
40
50
60
0 20 40 60 80 100
Pl
a
s
t
i
c
i
t
y

I
n
d
e
x

(
%
)
Liquid Limit (%)
Plate
B-7
Client Name:Lab #217270
Job Number:Date Sampled:
Project:Sampled By:Client
Sample Location:Date Received:
Material Type:Received By:LAB
AASHTO T 11 ASTM D1140
Wt. Ret.% Ret Cumulativ
e % Ret.% Pass Target Pass/ Fail
#200 70.0 11.68 11.7 88.3
Total - #200 529.6 88.32 100.0 0.0
Total 599.6 100.00
Split Moisture Pan #:
Wet Weight:1236.1 705.7
Dry Weight:1114.1 611.1 Dry Weight After Wash:584.5
Weight of Water:122.0296 94.6 Weight -#200 Washed:529.5703969
Pan Weight:514.5 146.3
Water Content:20.4%20.4%
Weight of Dry Soil 599.6 464.8
1796-002
Blue Bench Landfill
TP-2 @ 0-4
Fat CLAY
Percentage of Soil Finer than #200 Sieve
AE2
Plate
B-8
TP-3 TESTS
Project:
Project Number:Initial Final
Soil Classification:2.65 2.65
Sample No.:334.4 334.4
Test Date:5.6 5.6
Permeant Liquid:6.1 6.1
24.7 24.7
138.8 138.8
14.0 65.4
127.4 127.4
125 582
Recorded Time Elapsed Time
(sec)k (cm/sec)Temp
(°C)
Viscocity
Ratio, Rf
k20
(cm/sec)
2/2/24 8:06 AM 62880 9.1E-09 20 1.000 9.11E-09
2/2/24 3:05 PM 25140 8.9E-09 20 1.000 8.92E-09
2/5/24 7:57 AM 233520 9.1E-09 20 1.000 9.08E-09
2/5/24 3:25 PM 26880 9.3E-09 20 1.000 9.32E-09
Average k20 9.11E-09 cm/sec
PROJECT NO.: 1796-002 Sample No.
217271
Sample Area (cm2):
Volume (cm3):
Water Content (%):
Dry Unit Weight, γd (pcf):
Saturation (%):
TP-3 @ 0-4'Mass (g):
1/23/2024 Sample Length (cm):
Water Diameter (cm):
SILT with sand Gs:
Hydraulic Conductivity of Saturated Pourous Materials
Using a Flexible Wall Permeameter
ASTM D5856, Method D
Blue Bench Landfill
1796-002
Copyright GeoStrata , 2024
8.00E-09
8.50E-09
9.00E-09
9.50E-09
1.00E-08
2/2/24 0:00 2/2/24 12:00 2/3/24 0:00 2/3/24 12:00 2/4/24 0:00 2/4/24 12:00 2/5/24 0:00 2/5/24 12:00 2/6/24 0:00
k20

(c
m
/
s
e
c
)
Time (min)
Plate
B-9
Client:Lab #:
Job #:Date:
Project:Tested By:
Diameter of Soil (in)1.035
Pan Weight:94.1
Height of Soil (in)0.645
Moisture-Density
Wet Weight:
Dry Weight:
110.9
108.2
Material Type:
Sample Location:
AE2
1796-002
Blue Bench Landfill
TP-3 @ 0-4
SILT with sand
217271
Wet Density (pcf)118.0
Moisture Content (%)19.1
Dry Density (pcf)99.0
Plate
B-10
Client:AE2 Lab #217271
Job Number 1796-002 Date Sampled:
Project Blue Bench Landfill Sampled By:Client
Sample Location:TP-3 @ 0-4 Date Received:
Material Type:SILT with sand Received By:
Specimen Preparation:
Liquid Limit Method:
Liquid Limit Plasticity Index
49 21
Atterberg Limits - ASTM 4318
0
10
20
30
40
50
60
0 20 40 60 80 100
Pl
a
s
t
i
c
i
t
y

I
n
d
e
x

(
%
)
Liquid Limit (%)
Plate
B-11
Client Name:Lab #217271
Job Number:Date Sampled:
Project:Sampled By:Client
Sample Location:Date Received:
Material Type:Received By:LAB
AASHTO T 11 ASTM D1140
Wt. Ret.% Ret Cumulativ
e % Ret.% Pass Target Pass/ Fail
#200 162.2 19.70 19.7 80.3
Total - #200 661.3 80.30 100.0 0.0
Total 823.5 100.00
Split Moisture Pan #:
Wet Weight:1511.4 620.2
Dry Weight:1342.7 539.7 Dry Weight After Wash:681.4
Weight of Water:168.7201 80.5 Weight -#200 Washed:661.2798902
Pan Weight:519.2 146.8
Water Content:20.5%20.5%
Weight of Dry Soil 823.5 392.9
1796-002
Blue Bench Landfill
TP-3 @ 0-4
SILT with sand
Percentage of Soil Finer than #200 Sieve
AE2
Plate
B-12
TP-4 TESTS
Project:
Project Number:Initial Final
Soil Classification:2.65 2.65
Sample No.:395.6 395.6
Test Date:6.5 6.5
Permeant Liquid:6.4 6.4
32.9 32.9
213.4 213.4
14.0 38.0
120.4 120.4
99 270
Recorded Time Elapsed Time
(sec)k (cm/sec)Temp
(°C)
Viscocity
Ratio, Rf
k20
(cm/sec)
14:55:00 1680 6.5E-08 20 1.000 6.54E-08
15:26:00 1860 6.8E-08 20 1.000 6.77E-08
15:54:00 1680 6.3E-08 20 1.000 6.34E-08
16:28:00 2040 6.8E-08 20 1.000 6.77E-08
Average k20 6.60E-08 cm/sec
PROJECT NO.: 1796-002 Sample No.
217272
Sample Area (cm2):
Volume (cm3):
Water Content (%):
Dry Unit Weight, γd (pcf):
Saturation (%):
TP-4 @ 0-4'Mass (g):
1/22/2024 Sample Length (cm):
Water Diameter (cm):
Lean CLAY with sand Gs:
Hydraulic Conductivity of Saturated Pourous Materials
Using a Flexible Wall Permeameter
ASTM D5856, Method D
Blue Bench Landfill
1796-002
Copyright GeoStrata , 2024
5.00E-08
5.50E-08
6.00E-08
6.50E-08
7.00E-08
7.50E-08
8.00E-08
14:38:24 14:52:48 15:07:12 15:21:36 15:36:00 15:50:24 16:04:48 16:19:12 16:33:36
k20

(c
m
/
s
e
c
)
Time (min)
Plate
B-13
Client:Lab #:
Job #:Date:
Project:Tested By:
Diameter of Soil (in)1.498
Pan Weight:92.8
Height of Soil (in)0.413
Moisture-Density
Wet Weight:
Dry Weight:
116.3
113.5
Material Type:
Sample Location:
AE2
1796-002
Blue Bench Landfill
TP-4 @ 0-4
217272
Wet Density (pcf)123.1
Moisture Content (%)13.5
Dry Density (pcf)108.4
Plate
B-14
Client:AE2 Lab #217271
Job Number 1796-002 Date Sampled:
Project Blue Bench Landfill Sampled By:Client
Sample Location:TP-4 @ 0-4 Date Received:
Material Type:Lean CLAY with sand Received By:
Specimen Preparation:
Liquid Limit Method:
Liquid Limit Plasticity Index
49 21
Atterberg Limits - ASTM 4318
0
10
20
30
40
50
60
0 20 40 60 80 100
Pl
a
s
t
i
c
i
t
y

I
n
d
e
x

(
%
)
Liquid Limit (%)
Plate
B-15
Client Name:Lab # 217272
Job Number:Date Sampled:
Project:Sampled By: Client
Sample Location:Date Received:
Material Type:Received By: LAB
AASHTO T 11 ASTM D1140
Wt. Ret. % Ret
Cumulative
% Ret.% Pass Target Pass/ Fail
#200 153.1 17.95 18.0 82.0
Total - #200 699.8 82.05 100.0 0.0
Total 852.9 100.00
Split Moisture Pan #:
Wet Weight: 1529.5 719.5
Dry Weight: 1370.0 629.2 Dry Weight After Wash: 670.2
Weight of Water: 159.5458 90.3 Weight -#200 Washed: 699.754241
Pan Weight: 517.1 146.5
Water Content: 18.7% 18.7%
Weight of Dry Soil 852.9 482.7
TP-4 @ 0-4
Lean CLAY with sand
Percentage of Soil Finer than #200 Sieve
AE2
1796-002
Blue Bench Landfill
Plate
B-16

APPENDIX C

Design Drawings
8+25
2+00
3+00
4+00
5+00
6+00
7+00
8+00
-
3
:
1
-
5
.
0
%
-3:1
6120
6100
6140
6150
6150
6140
6130
6110
61
2
0
61
3
0
61
2
0
61
3
0
61
4
0
61
5
0
-5.0%
-3
:
1
6120
6110
6110
6130
CROSS-SECTION A
6100
6125
6150
6100
0+00 1+00 2+00 3+00 4+00 5+00 6+00
CROSS-SECTION B
6100
6125
6150
6100
0+00 1+00 2+00 3+00 4+00 5+00 6+00
RE
V
I
S
I
O
N
DA
T
E
DESIGNED:
DRAWN:
CHECKED:
DATE:
TL
CH
6/15/23
NO
.
0 1/2
DRAWING IS NOT TO SCALE IF BAR
DOES NOT MEASURE 1 INCH
1
CH
BL
U
E
B
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C
H

L
A
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F
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L

-

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T

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B
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S
N
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,

U
T
C&D
4020040
HORIZ: 1" = 40'
LEGEND
EXISTING (2020)
C&D FINAL COVER
OLD MAINTENANCE
FACILITY
6150
6155
6150
6155
FI
L
E

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3
.
d
w
g
A A
B B
20'
30'
3:1
3:1
30' RD. (3% CROSS-SLOPE)
5%
5%
GRADE BREAK (6150 FT.)
EXISTING
FENCELINE
PROPOSED UNLINED CLASS IVa DISPOSAL AREA
(NOT FOR CLASS I DISPOSAL)
570.0'
440.0'
PROPOSED UNLINED
CLASS IVa DISPOSAL AREA
EXISTING
CLOSED C&D
DISPOSAL AREA
EXISTING MSW
DISPOSAL AREA
(OPEN & CLOSED)
NEW MAINTENANCE FACILITY
NEW 30 FT. PERIMETER RD.
EA
S
T

A
C
C
E
S
S

R
D
.
VICINITY MAP
NO SCALE
EXISTING TOPOGRAPHY (2020)
C&D FINAL COVER
GRADE BREAK (6150 FT.)
B
B
3:1
3:1
CLASS IVa WASTE
CLASS IVa WASTE
PL
O
T

D
A
T
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:

3/
6
/
2
4