Amendment 0002 LD7OD_B-302.pdf
PDF 252 KB Posted
- Attached to
- Lock & Dam 7 Outdraft Modification
- Solicitation number
- W912ES25BA001
About this file
This document is a geotechnical boring log for the Lock & Dam 7 Outdraft Modification project, prepared by the U.S. Army Corps of Engineers St. Paul District. The file contains detailed geological survey information for five separate boring locations (24-50M through 24-54M) along the Mississippi River, conducted on October 8-9, 2024. Each boring log provides precise elevation data, water depth measurements, and soil composition details, including stratification of soil layers such as poorly graded sand, silty clay, and saturated tan sediments.
The technical documentation includes specific methodological notes about sample collection, including use of a floating plant, 4-inch pipe casing stabilization, Standard Penetration Test (SPT) procedures with a 140# hammer, and sample collection techniques. The borings were performed to assess ground conditions for the proposed lock and dam modification, with elevations referenced to Pool 7 Gauge and using NAD 83 (2011) coordinate system. The solicitation (W912ES25BA001) is set aside 100% for small businesses, with an estimated contract value between $5-10 million under NAICS code 237990.
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Text version
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NOTES:
SPT
AIR0' TO 1.5'
WATER1.5' TO 10.5'
24-51M
08 OCT 2024
10D MC LL PL
W.S. 638.5
625.5
629.5
DECK 640.0
H2O
SP
SHELLS, SATURATED, TAN
(SP) POORLY GRADED SAND, LOOSE, TRACE 10.5' TO 14.5'
1. BORING OBTAINED FROM A FLOATING PLANT
ALCONOX WASH AND RIVER RINSE BETWEEN SAMPLES
2. HOLE STABILIZED WITH 4-INCH PIPE CASING TO EL. 627.5
3. SPT = 140# HAMMER, 30 INCH DROP, USING CATHEAD
4. ELEVATION DETERMINED FROM POOL 7 GAUGE
5. PULLED CASING AT END OF BORING, ALLOWED HOLE TO COLLAPSE
NOTES:
WH
SPT
AIR0' TO 1.5'
WATER1.5' TO 14.2'
24-50M
08 OCT 2024
10D MC LL PL
622.0
625.8
DECK 640.0
W.S. 638.5
H2O
SP SATURATED, TAN
(SP) POORLY GRADED SAND, VERY LOOSE, 14.2' TO 18'
1. BORING OBTAINED FROM A FLOATING PLANT
DRILLING MUD USED BELOW
2. HOLE STABILIZED WITH 4-INCH PIPE CASING TO EL. 625.5
3. SPT = 140# HAMMER, 30 INCH DROP, USING CATHEAD
4. ELEVATION DETERMINED FROM POOL 7 GAUGE
5. PULLED CASING AT END OF BORING, ALLOWED HOLE TO COLLAPSE
NOTES:
WH
SPT
AIR0' TO 1.5'
WATER1.5' TO 10.2'
SATURATED, TAN
(SP) POORLY GRADED SAND, V. LOOSE, 10.2' TO 14.0'
DECK 640.0
24-52M
08 OCT 2024
10D MC LL PL
626.0
629.8
W.S. 638.5
H2O
SP
1. BORING OBTAINED FROM A FLOATING PLANT
ALCONOX WASH AND RIVER RINSE BETWEEN SAMPLES
2. HOLE STABILIZED WITH 4-INCH PIPE CASING TO EL. 628.0
3. SPT = 140# HAMMER, 30 INCH DROP, USING CATHEAD
4. ELEVATION DETERMINED FROM POOL 7 GAUGE
5. PULLED CASING AT END OF BORING, ALLOWED HOLE TO COLLAPSE
NOTES:
SPT
AIR0' TO 1.5'
WATER1.5' TO 9.0'
ORGANIC
(CH) SILTY CLAY, V. SOFT, WET, DK. GRAY, SL. 9.0' TO 10.9'
DECK 632.2
24-53M
09 OCT 2024
10D MC LL PL
W.S. 630.7
621.3
623.2
H2O
CH
1. BORING OBTAINED FROM A FLOATING PLANT
2. ALCONOX WASH AND RIVER RINSE BETWEEN SAMPLES
3. SAMPLE TAKENS BY PUSHING STAINLESS SPLIT SPOON
4. ELEVATION DETERMINED FROM POOL 7 TW GAUGE
5. SAMPLE HOLE ALLOWED TO COLLAPSE
NOTES:
SPT
AIR0' TO 1.5'
WATER1.5' TO 8.1'
GRAY, V. SOFT-SOFT
(CH) SILTY CLAY, OCC. SAND LENS, WET, DK. 8.1' TO 11.7'
24-54M
09 OCT 2024
10D MC LL PL
W.S. 630.7
619.3
624.1
620.5
SP
SATURATED, TAN
(SP) POORLY GRADED SAND, LOOSE, 11.7' TO 12.9'
H2O
CH
DECK 632.2
1. BORING OBTAINED FROM A FLOATING PLANT
ALCONOX WASH AND RIVER RINSE BETWEEN SAMPLES
2. HOLE STABILIZED WITH 4-INCH PIPE CASING TO EL. 622.2
3. STAINLESS SAMPLER USED WITH CATHEAD DRIVEN HAMMER
4. ELEVATION DETERMINED FROM POOL 7 TW GAUGE
5. PULLED CASING AT END OF BORING, ALLOWED HOLE TO COLLAPSE
®of Engineers
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