EOU West Steam 00 31 00 Attachment 2 - Piezo Borings and Lab results.pdf
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- Solicitation number
- S-580100-00015853
- Issued by
- Umatilla County, Oregon
About this file
This document is a geotechnical investigation report containing piezo boring logs and laboratory test results for the Eastern Oregon University (EOU) West Steam Tunnel System Improvements project in La Grande, Oregon. The report documents two boreholes (B-1 and B-2) drilled on July 18, 2022, by Western States Soil Conservation, Inc., using mud rotary boring methods with a 4 7/8-inch diameter boring bit. Both boreholes were completed to depths of approximately 25 feet and included the installation of 2-inch Schedule 40 PVC well casing with 0.020-inch slot width screens set at 25.0 feet and 24.5 feet respectively, topped with flush-mount monuments and concrete surface seals. The boring logs identified subsurface soil conditions consisting of fill materials near the surface transitioning to very dense gravels with silt and sand at depth, with moisture content percentages ranging from 7 to 18 percent.
Laboratory analysis of samples from both boreholes included grain-size testing and Atterberg limits determinations. Boring B-1 samples from 7.5 feet and 20.0 feet depths showed P200 values of 11 percent and 15 percent respectively, while Boring B-2 samples from 10.0 feet and 20.0 feet depths exhibited P200 values of 20 percent and 9 percent respectively. The grain-size analysis indicated that soils at both locations consisted primarily of gravel and sand with varying percentages of silt and clay components. This subsurface investigation provides critical geotechnical data to support the design and construction planning for the steam tunnel system improvements, including the selective demolition, trenching, backfill, and new distribution piping and vault installation planned for the project.
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Text version
ehedberg Callout Piezometer B-1 ehedberg Callout Piezometer B-2 ehedberg Ellipse ehedberg Callout Approx.
Sump Pit ehedberg Text Box G Avenue ehedberg Text Box 8th Street ehedberg Text Box 7th Street ehedberg Ellipse ehedberg Ellipse
Flush-mount monument with 1 foot of concrete surface seal
2-inch Schedule 40 PVC well casing
Bentonite chips
12/20 filter pack sand
2-inch Schedule 40 PVC screen, 0.0.20-inch slot width
Driller Comment:
Change out of gravel at 11.5 feet.
Rig chatter at 17.5 feet.
P200 = 11%
Well #011-2161151 set at 25.0 feet
Surface elevation was not measured at the time of exploration.
11.5
17.5
25.3
.9 f e e t o n
/1
/2
SIEV
P200
Very dense, brown, silty GRAVEL with sand (GM), trace organics; moist, gravel is subrounded to subangular, weak to moderate cementation.
without organics at 7.5 feet
Very stiff, brown with orange and gray mottled, sandy SILT (ML); moist, sand is fine.
Very dense, brown-gray GRAVEL with silt and sand (GP-GM); moist, gravel is subrounded to subangular.
Exploration completed at a depth of
25.3 feet.
Hammer efficiency factor is 77.5 percent.
INSTALLATION AND
COMMENTS
MOISTURE CONTENT %
CORE REC%RQD%
BLOW COUNT
BORING B-1
COMPLETED: 07/18/22
FIGURE A-1
BORING BIT DIAMETER: 4 7/8 inches
LA GRANDE, OR
EOU-4-02
EOU STEAM TUNNEL SYSTEM IMPROVEMENTS
MATERIAL DESCRIPTION
T
ES
T
IN
G
DEPTH
FEET
LOGGED BY: H. Herinckx
SEPTEMBER 2022
BORING METHOD: mud rotary (see document text)
DRILLED BY: Western States Soil Conservation, Inc.
G R A
PH
IC
L O
G
SA
M
PL
E
EL
EV
A T
IO
N
D
EP
T H
B O
R
IN
G L
O G
N
V
P
ER
P A
G E
E O
U -4
-0
-B
_2 .G
P J
G D
I_ N
V
.G D
T
P R
IN
T
D A
T E:
/2
/2
:K
T
23-46-50/4"
11-50/4"
50/5"
50/3"
0 50 100
0 50 100
0.0
2.5
5.0
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0
27.5
30.0
Flush-mount monument with 1 foot of concrete surface seal
2-inch Schedule 40 PVC well casing
Bentonite chips
12/20 filter pack sand
P200 = 15%
2-inch Schedule 40 PVC screen, 0.0.20-inch slot width
P200 = 9%
Well #011-2161188 set at 24.5 feet
Hole caved approximately 0.5 foot after flushing out.
Surface elevation was not measured at the time of exploration.
4.5
7.0
15.0
25.4
.6 f e e t o n
/1
/2
P200
P200
Soft to medium stiff, dark brown SILT with sand (ML), trace gravel and organics; moist, sand is fine to medium, gravel is angular - FILL.
Medium dense, dark brown, silty GRAVEL (GM), minor sand; moist, gravel is subangular - FILL.
Very dense, brown with yellow mottled, silty GRAVEL with sand (GM); moist, gravel is subrounded to subangular, sand is fine to coarse, weak to moderate cementation.
gray-brown at 10.0 feet
Very dense, brown-gray GRAVEL with silt and sand (GP-GM); moist, gravel is subrounded to subangular.
Exploration completed at a depth of
25.4 feet.
Hammer efficiency factor is 77.5 percent.
INSTALLATION AND
COMMENTS
MOISTURE CONTENT %
CORE REC%RQD%
BLOW COUNT
BORING B-2
COMPLETED: 07/18/22
FIGURE A-2
BORING BIT DIAMETER: 4 7/8 inches
LA GRANDE, OR
EOU-4-02
EOU STEAM TUNNEL SYSTEM IMPROVEMENTS
MATERIAL DESCRIPTION
T
ES
T
IN
G
DEPTH
FEET
LOGGED BY: H. Herinckx
SEPTEMBER 2022
BORING METHOD: mud rotary (see document text)
DRILLED BY: Western States Soil Conservation, Inc.
G R A
PH
IC
L O
G
SA
M
PL
E
EL
EV
A T
IO
N
D
EP
T H
B O
R
IN
G L
O G
N
V
P
ER
P A
G E
E O
U -4
-0
-B
_2 .G
P J
G D
I_ N
V
.G
IN
T
D A
T E:
/2
/2
:K
T
21-50/5"
46-50/1"
50/3"
50/5"
0 50 100
0 50 100
0.0
2.5
5.0
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0
27.5
30.0
0.0010.010.11101001,000
COARSE
FINES
BOULDERS
D10
COARSE
GRAIN SIZE IN MILLIMETERS
P E R
C E N
T F
IN
E R
B Y
W E
IG
H T
SAND
(PERCENT)
7.5
SILT
D60
3/4" 40
MEDIUM
GRAVEL
(PERCENT)
FINE
4 10 20
D30
MOISTURE CONTENT
(PERCENT)
D5
SAMPLE DEPTH
(FEET)
U.S. STANDARD SIEVE NUMBERS
3"
FINE
COBBLES
CLAY
(PERCENT)
D50
3/8"
CLAY
EXPLORATION
NUMBER
1 1/2"
SILT
(PERCENT)
KEY
GRAIN-SIZE TEST RESULTS
100 200
SANDGRAVEL
18 4.72 2.71 0.71B-1
FIGURE
EOU STEAM TUNNEL SYSTEM IMPROVEMENTS
LA GRANDE, OR
EOU-4-02
AUGUST 2022
_GRAIN SIZE NO P200 EOU-4-02-B1_2.GPJ GEODESIGN.GDT PRINT DATE: 8/25/22:
B-1 7.5 18 40 48 12
B-1 20.0 20 11
B-2 10.0 20 15
B-2 20.0 18 9
GRAVEL
(PERCENT)
SAMPLE
DEPTH
(FEET)
SUMMARY OF LABORATORY DATA
ELEVATION
(FEET)
P200
(PERCENT)
SIEVE
PLASTIC
LIMIT
PLASTICITY
INDEX
ATTERBERG LIMITS
MOISTURE
CONTENT
(PERCENT)
SAMPLE INFORMATION
EXPLORATION
NUMBER
SAND
(PERCENT)
DRY
DENSITY
(PCF)
LIQUID
LIMIT
EOU-4-02
AUGUST 2022
EOU STEAM TUNNEL SYSTEM IMPROVEMENTS
LA GRANDE, OR
FIGURE
L A
B S
U M
M A
R Y
G D
I- N
V
E O
U -4
-0
-B
.G P J
G D
I_ N
V
.G
IN
T
D A
T E
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