00_31_32-1_3_A_1_k_20170718 Inclinometer Readings.pdf

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Upper Brownsville Levee
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191BWC25R0010
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This document is a technical memorandum from Arcadis U.S., Inc. to the International Boundary and Water Commission (IBWC) detailing July 2017 inclinometer readings for the Remediation Design of Levee Floodplain Failure within the Upper Brownsville Levee Reach Lower Rio Grande Flood Control Project. The report presents findings from slope inclinometer measurements at multiple monitoring points (ARC-1 through ARC-4 and existing inclinometers I-32, I-33, and I-34), tracking ground movement and surface tension cracks along the levee.

The technical memo includes incremental and cumulative displacement plots showing slight progressive movement towards the Rio Grande, particularly for inclinometers ARC-1 and ARC-2, with displacements ranging from 0.12 to 0.13 inches. The investigation noted several surface changes, including removed and reinstalled measurement pins and erosion of surface tension cracks. The report concludes that while movement is detectable, it is progressing at a slow rate, and this information will be used to finalize the Draft Geotechnical Assessment Report for the project.

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Arcadis U.S., Inc.

10352 Plaza Americana Drive

Baton Rouge

Louisiana 70816

Tel 225 292 1004

Fax 225 218 9677

Page:

1/4

MEMO

To:

Edgar Iniguez Contracting Officer Representative

IBWC

Copies:

Padinare Unnikrishna (USIBWC) Armando Flores (Arcadis)

From:

Kirk Lowery, P.E.

Date: Arcadis Project No.:

July 18, 2017 LA003315.0000

Subject:

July 2017 Final Summary Report of Inclinometer Readings Remediation Design of Levee Floodplain Failure within the Upper Brownsville Levee Reach Lower Rio Grande Flood Control Project – IBM15D0001 – IBM15T0015

1. Introduction

Arcadis U.S., Inc. (Arcadis), is pleased to submit this summary technical memorandum including data charts of the slope inclinometer readings at the IBWC site. The baseline readings for the new inclinometers, ARC- 1, ARC-2, ARC-3 and ARC-4, were taken in June 2016 and the eleventh set of readings were measured on July 12, 2017. Under the current scope of work, this month will be the last measurement to be taken for these inclinometers.

Exact readings for the existing inclinometers, I-32, I-33 and I-34, were not made when Arcadis visited the site July 12, 2017. However, the probe was placed in the inclinometer casings and the depth at which it would not pass was recorded. Arcadis measured the depth range in which the inclinometer probe could not pass through the constricted area of the pipe and are as follows:

I-32 (Top of the Levee): Depth Range: 32 feet

I-33 (Toe of the Levee): Depth Range: 38 feet

I-34 (Below Toe of Levee): Depth Range: 30 feet to 31 feet

In this month’s visit to the IBWC site, several pins that were installed on June 14, 2017 on top of the levee near inclinometer ARC-1 and south of the existing retaining wall have been removed or disturbed due to the traffic on the levee roadway. In addition, recent rainfall has started to erode the surface tension cracks and they are becoming less apparent. All the pins that were removed, were set back to their original locations

2/4

MEMO

to take this month’s measurements. Over the last month, the tension cracks appear to have not changed except for the cracks that are located between the pins 18B and 19B. For those pins, there was a slight increase in width of 0.5 inch. The locations of the cracks and the pins are shown in Attachment B while Attachment C presents photos of the tension cracks.

Table 1 summarizes the pin flags location along the cracks.

Table 1. Pin Flag Locations

Pin Flag No. Pin Location Remarks

1B and 2B 3.33' south of inclinometer ARC-1.

8.5" between the two pin flags.

No Change

3B and 4B 11.25" south of inclinometer ARC-1.

9.5" between the two pin flags.

No Change

5B GPS coordinates N25.898212o, W- 97.496628o

6B and 7B 7' south of 5B.

9.0" between the two pin flags.

Pin 6B was removed

8B and 9B 16' south of 5B.

9.75" between the two pin flags. Pins were removed

10B 24' south of 5B. -

11B GPS coordinates N25.897973o, W- 97.496493o

12B and 13B 12' south of 11B.

11.0" between the two pin flags. Pins were removed

14B and 15B 42' south of 11B.

10.5" between the two pin flags.

Pins were removed

16B 57' south of 11B. -

17B 6' west of 14B and 15B. -

18B and 19B 10.5' south of 17B.

12.25" between the two pin flags. 0.5 inch increase

20B 21' south of 17B.

21B -

3/4

MEMO

GPS coordinates N25.897669o, W- 97.496309o

22B and 23B 18' south of 21B.

9.75" between the two pin flags.

Pins were removed

24B and 25B 54' south of 21B.

10.0" between the two pin flags.

Pin 24B was removed

26B 72' south of 21B. -

The readings for each inclinometer are reflected in the graphical displays provided in Attachment A.

Attachment A includes both incremental and cumulative displacement plots. Attachment B shows the inclinometer locations on a Google Map.

The incremental displacement plot compares the mean deviation data to the baseline survey file. This plot reveals the exact depth where displacements are actually occurring. The cumulative displacement is the sum of the displacements from the base of the borehole. This plot shows the change in the position of the casing from the first set of readings.

The A-axis charts in the displacement plots show displacements in the plane perpendicular to the levee while the B-axis charts show displacements in the plane parallel with the levee. A positive reading in the A-axis chart indicates displacement to the west heading toward the Rio Grande, and a positive reading in the B-axis chart indicates displacement to the north heading toward the Gateway Bridge.

2. Digitilt AT Inclinometer

Digitilt AT system was used to survey the inclinometers. The system components include an inclinometer probe, control cable, a Bluetooth reel and the Digitilt Reader app for certified Android-based tablet computer.

The equipment is shown in Figure 1.

Figure 1: Digitilt AT System Components.

4/4

MEMO

3. July 2017 Inclinometers Assessment

The depth of the casing restriction for the USACE installed inclinometers, I-32, I-33 and I-34 appears to be the same depth as the previous readings.

Data collected on July 12, 2017 followed the same trend as the baseline reading measured in June 2016.

The monthly displacement plots recorded between July 2016 through July 2017 are presented in Attachment A. Data comparisons for each inclinometer are described below:

Inclinometer ARC-1: The base readings for inclinometer ARC-1 were collected on June 22, 2016. The ARC- 1 cumulative plot in the A-Axis direction shows a slight progressive movement starting at depths between 28 and 30 feet. This depth corresponds with the interpreted Alluvium/Pleistocene interface presented in Figure 2 of Arcadis’ December 2, 2016 Draft Geotechnical Assessment Report. Comparing the measurements taken in July 2016 to July 2017, the displacement is 0.12 inches towards the Rio Grande (A- Axis) at a depth of 28 feet. The displacement parallel to the levee does not show any sign of movement in this month’s readings.

Inclinometer Arc-2: The base readings for inclinometer ARC-2 were collected on June 17, 2016. The ARC- 2 cumulative displacement plot in the A-Axis direction shows a slight displacement between the depths of 38 feet to 40 feet. This depth corresponds with the interpreted Alluvium/Pleistocene interface presented in Figure 2 of Arcadis’ December 2, 2016 Draft Geotechnical Assessment Report. Comparing the measurements taken in July 2016 to July 2017, the displacement is 0.13 inches towards the Rio Grande (A- Axis) at a depth of 38 feet. The displacement parallel to the levee does not show any sign of movement in this month’s readings.

Inclinometer ARC-3: The base readings for inclinometer ARC-3 were collected on June 17, 2016. The ARC- 3 cumulative and incremental displacement does not show any sign of movement on the plane perpendicular to the levee nor on the plane parallel to the levee.

Inclinometer ARC-4: The base readings for inclinometer ARC-4 were collected on June 22, 2016. The ARC- 4 cumulative and incremental displacement does not show any sign of movement on the plane perpendicular to the levee nor on the plane parallel to the levee.

After critically reviewing the cumulative displacement plots, the graphical displays in Attachment A shows that in each month there is an increase in movement towards the Rio Grande (A-Axis direction) for the inclinometers ARC-1 and ARC-2. The displacement for these inclinometers are progressive but moving at a slow rate. This information will be summarized and used to finalize the Draft Geotechnical Assessment Report.

ATTACHMENTS:

A – Inclinometer Plots B – Inclinometer and Levee Cracking Location Map C – Photos of Surface Tension Cracks

ATTACHMENT A

INCLINOMETER PLOTS

IBWC Arc-1 A - Axis

6/22/2016 11:22:30 AM 7/25/2016 3:17:20 PM

8/25/2016 1:34:40 PM 9/22/2016 1:35:22 PM

10/27/2016 2:18:50 PM 11/14/2016 1:34:00 PM

12/22/2016 3:53:53 PM 2/8/2017 9:25:00 AM

3/17/2017 12:20:09 PM 4/10/2017 3:12:10 PM

5/9/2017 2:13:46 PM 6/14/2017 12:51:51 PM

7/12/2017 9:22:17 AM

D ep th in

F ee t

Incremental Displacement (in) -2 -1 0 1 2

IBWC Arc-1 B - Axis

6/22/2016 11:22:30 AM 7/25/2016 3:17:20 PM

8/25/2016 1:34:40 PM 9/22/2016 1:35:22 PM

10/27/2016 2:18:50 PM 11/14/2016 1:34:00 PM

12/22/2016 3:53:53 PM 2/8/2017 9:25:00 AM

3/17/2017 12:20:09 PM 4/10/2017 3:12:10 PM

5/9/2017 2:13:46 PM 6/14/2017 12:51:51 PM

7/12/2017 9:22:17 AM

D ep th in

F ee t

Incremental Displacement (in) -2 -1 0 1 2

IBWC Arc-1 A - Axis

6/22/2016 11:22:30 AM 7/25/2016 3:17:20 PM

8/25/2016 1:34:40 PM 9/22/2016 1:35:22 PM

10/27/2016 2:18:50 PM 11/14/2016 1:34:00 PM

12/22/2016 3:53:53 PM 2/8/2017 9:25:00 AM

3/17/2017 12:20:09 PM 4/10/2017 3:12:10 PM

5/9/2017 2:13:46 PM 6/14/2017 12:51:51 PM

7/12/2017 9:22:17 AM

D ep th in

F ee t

Cumulative Displacement (in) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2

IBWC Arc-1 B - Axis

6/22/2016 11:22:30 AM 7/25/2016 3:17:20 PM

8/25/2016 1:34:40 PM 9/22/2016 1:35:22 PM

10/27/2016 2:18:50 PM 11/14/2016 1:34:00 PM

12/22/2016 3:53:53 PM 2/8/2017 9:25:00 AM

3/17/2017 12:20:09 PM 4/10/2017 3:12:10 PM

5/9/2017 2:13:46 PM 6/14/2017 12:51:51 PM

7/12/2017 9:22:17 AM

D ep th in

F ee t

Cumulative Displacement (in) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2

IBWC Arc-2 A - Axis

6/17/2016 6:27:13 PM 7/25/2016 3:57:11 PM

8/25/2016 2:02:22 PM 9/22/2016 2:05:40 PM

10/27/2016 2:44:45 PM 11/14/2016 1:57:25 PM

12/22/2016 4:18:54 PM 2/8/2017 9:52:21 AM

3/17/2017 11:58:39 AM 4/10/2017 2:47:48 PM

5/9/2017 1:53:54 PM 6/14/2017 1:13:37 PM

7/12/2017 8:38:59 AM

D ep th in

F ee t

Incremental Displacement (in) -2 -1 0 1 2

IBWC Arc-2 B - Axis

6/17/2016 6:27:13 PM 7/25/2016 3:57:11 PM

8/25/2016 2:02:22 PM 9/22/2016 2:05:40 PM

10/27/2016 2:44:45 PM 11/14/2016 1:57:25 PM

12/22/2016 4:18:54 PM 2/8/2017 9:52:21 AM

3/17/2017 11:58:39 AM 4/10/2017 2:47:48 PM

5/9/2017 1:53:54 PM 6/14/2017 1:13:37 PM

7/12/2017 8:38:59 AM

D ep th in

F ee t

IBWC Arc-2 A - Axis

6/17/2016 6:27:13 PM 7/25/2016 3:57:11 PM

8/25/2016 2:02:22 PM 9/22/2016 2:05:40 PM

10/27/2016 2:44:45 PM 11/14/2016 1:57:25 PM

12/22/2016 4:18:54 PM 2/8/2017 9:52:21 AM

3/17/2017 11:58:39 AM 4/10/2017 2:47:48 PM

5/9/2017 1:53:54 PM 6/14/2017 1:13:37 PM

7/12/2017 8:38:59 AM

D ep th in

F ee t

Cumulative Displacement (in) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2

IBWC Arc-2 B - Axis

6/17/2016 6:27:13 PM 7/25/2016 3:57:11 PM

8/25/2016 2:02:22 PM 9/22/2016 2:05:40 PM

10/27/2016 2:44:45 PM 11/14/2016 1:57:25 PM

12/22/2016 4:18:54 PM 2/8/2017 9:52:21 AM

3/17/2017 11:58:39 AM 4/10/2017 2:47:48 PM

5/9/2017 1:53:54 PM 6/14/2017 1:13:37 PM

7/12/2017 8:38:59 AM

D ep th in

F ee t

IBWC Arc-3 A - Axis

6/17/2016 7:05:22 PM 7/25/2016 4:28:56 PM

8/25/2016 2:41:46 PM 9/22/2016 2:36:13 PM

10/27/2016 3:17:17 PM 11/14/2016 2:27:09 PM

12/22/2016 4:38:15 PM 2/8/2017 10:12:24 AM

3/17/2017 11:40:50 AM 4/10/2017 2:26:29 PM

5/9/2017 1:36:04 PM 6/15/2017 3:53:45 PM

7/12/2017 8:22:33 AM

D ep th in

F ee t

Incremental Displacement (in) -2 -1 0 1 2

IBWC Arc-3 B - Axis

6/17/2016 7:05:22 PM 7/25/2016 4:28:56 PM

8/25/2016 2:41:46 PM 9/22/2016 2:36:13 PM

10/27/2016 3:17:17 PM 11/14/2016 2:27:09 PM

12/22/2016 4:38:15 PM 2/8/2017 10:12:24 AM

3/17/2017 11:40:50 AM 4/10/2017 2:26:29 PM

5/9/2017 1:36:04 PM 6/15/2017 3:53:45 PM

7/12/2017 8:22:33 AM

D ep th in

F ee t

IBWC Arc-3 A - Axis

6/17/2016 7:05:22 PM 7/25/2016 4:28:56 PM

8/25/2016 2:41:46 PM 9/22/2016 2:36:13 PM

10/27/2016 3:17:17 PM 11/14/2016 2:27:09 PM

12/22/2016 4:38:15 PM 2/8/2017 10:12:24 AM

3/17/2017 11:40:50 AM 4/10/2017 2:26:29 PM

5/9/2017 1:36:04 PM 6/15/2017 3:53:45 PM

7/12/2017 8:22:33 AM

D ep th in

F ee t

Cumulative Displacement (in) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2

IBWC Arc-3 B - Axis

6/17/2016 7:05:22 PM 7/25/2016 4:28:56 PM

8/25/2016 2:41:46 PM 9/22/2016 2:36:13 PM

10/27/2016 3:17:17 PM 11/14/2016 2:27:09 PM

12/22/2016 4:38:15 PM 2/8/2017 10:12:24 AM

3/17/2017 11:40:50 AM 4/10/2017 2:26:29 PM

5/9/2017 1:36:04 PM 6/15/2017 3:53:45 PM

7/12/2017 8:22:33 AM

D ep th in

F ee t

IBWC Arc-4 A - Axis

6/22/2016 10:48:04 AM 7/25/2016 5:08:42 PM

8/25/2016 3:15:23 PM 9/22/2016 3:09:20 PM

10/27/2016 3:58:37 PM 11/14/2016 3:00:46 PM

12/22/2016 5:00:01 PM 2/8/2017 10:34:24 AM

3/17/2017 11:22:03 AM 4/10/2017 2:04:56 PM

5/9/2017 1:18:23 PM 6/14/2017 1:48:14 PM

7/12/2017 8:06:31 AM

D ep th in

F ee t

Incremental Displacement (in) -2 -1 0 1 2

IBWC Arc-4 B - Axis

6/22/2016 10:48:04 AM 7/25/2016 5:08:42 PM

8/25/2016 3:15:23 PM 9/22/2016 3:09:20 PM

10/27/2016 3:58:37 PM 11/14/2016 3:00:46 PM

12/22/2016 5:00:01 PM 2/8/2017 10:34:24 AM

3/17/2017 11:22:03 AM 4/10/2017 2:04:56 PM

5/9/2017 1:18:23 PM 6/14/2017 1:48:14 PM

7/12/2017 8:06:31 AM

D ep th in

F ee t

IBWC Arc-4 A - Axis

6/22/2016 10:48:04 AM 7/25/2016 5:08:42 PM

8/25/2016 3:15:23 PM 9/22/2016 3:09:20 PM

10/27/2016 3:58:37 PM 11/14/2016 3:00:46 PM

12/22/2016 5:00:01 PM 2/8/2017 10:34:24 AM

3/17/2017 11:22:03 AM 4/10/2017 2:04:56 PM

5/9/2017 1:18:23 PM 6/14/2017 1:48:14 PM

7/12/2017 8:06:31 AM

D ep th in

F ee t

Cumulative Displacement (in) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2

IBWC Arc-4 B - Axis

6/22/2016 10:48:04 AM 7/25/2016 5:08:42 PM

8/25/2016 3:15:23 PM 9/22/2016 3:09:20 PM

10/27/2016 3:58:37 PM 11/14/2016 3:00:46 PM

12/22/2016 5:00:01 PM 2/8/2017 10:34:24 AM

3/17/2017 11:22:03 AM 4/10/2017 2:04:56 PM

5/9/2017 1:18:23 PM 6/14/2017 1:48:14 PM

7/12/2017 8:06:31 AM

D ep th in

F ee t

ATTACHMENT B

INCLINOMETER AND LEVEE CRACKING LOCATION MAP

Concrete Pad

(2'x2'x4")

Arc-1 (B-1)

I-32

I-33

I-34

Arc-2 (B-2)

Arc-3 (B-3)

Arc-4 (B-4)

Pin #2B

Pin #1B

Pin #4B

Pin #3B

Pin #5B

Pin #6B

Pin #7B

Pin #8B

Pin #9B

Pin #10B

Pin #11B

Pin #12B

Pin #14B

Pin #13B

Pin #16B

Pin #15B

Pin #17B

Pin #19B

Pin #20B

Pin #18B

Pin #21B

Pin #23B

Pin #22B

Pin #25B

Pin #24B

Pin #26B

REMEDIATION DESIGN OF LEVEE FLOODPLAIN FAILURE

WITHIN THE UPPER BROWNSVILLE LEVEE REACH

LOWER RIO GRANDE FLOOD CONTROL PROJECT

INCLINOMETER & LEVEE CRACKING LOCATION

ATTACHMENT

B

IBWC

SUMMARY REPORT OF INCLINOMETER READINGS

ATTACHMENT C

PHOTOS OF SURFACE TENSION CRACKS

C-1

Photo 1 - Looking North - Surface Tension Crack of Pin Flags 1B through 4B.

Photo 2 - Looking North - Surface Tension Crack of Pin Flags 5B through 10B.

C-2

Photo 3 - Looking South - Surface Tension Crack of Pin Flags 11B through 20B.

Photo 4 - Looking South - Surface Tension Crack of Pin Flags 21B through 26B.

TM_Inclinometer Readings_IBWC Project_July 2017.pdf
IBWC_Attachment A_July 2017.pdf
Arc-1_Inc
Arc-1_Cum
Arc-2_Inc
Arc-2_Cum
Arc-3_Inc
Arc-3_Cum
Arc-4_Inc
Arc-4_Cum

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