W912PL19R0011_Amendment0001_Part5.pdf

Preliminary Geotechnical Report

AJO-CAG IFT Geotech Report (12-17-2014).docx

APPENDIX B -

GEOPHYSICAL SURVEY

B-1 AJO-CAG IFT Geotech Report (12-17-2014).docx

APPENDIX B – GEOPHYSICAL SURVEY

B.1 General

This appendix summarizes the results of the geophysical investigation performed at the proposed Integrated Fixed Tower (IFT) sites and at one access road river wash crossing location south of IFT CAG-0432. The geophysical investigation was completed between April 4 and April 9, 2014. The geophysical investigation consisted of seismic refraction surveys and electrical resistivity soundings. More details regarding the geophysical investigation are provided below.

B.2 Seismic Refraction Surveys

A total of 3,740 feet of seismic refraction data were collected along 17 survey lines. One seismic refraction survey was completed at each of the 16 proposed IFT sites, and an additional refraction survey was completed south of IFT CAG-0432 along an access road river wash crossing.

The seismic refraction method is based on the principle that seismic waves travel through different subsurface geologic conditions at different velocities. In order to resolve a subsurface layer boundary using the seismic refraction method, a density or velocity change must occur at that layer boundary. Seismic refraction surveying involves measuring the time required for a seismic pressure-wave (p-wave) to travel from a source point (shotpoint) to a series of co-linear sensors (geophones). These arrival times are plotted on time-distance graphs and interpreted using the generalized reciprocal method. The results provide a simplified two-dimensional picture of subsurface conditions and show the interpreted distribution of p-wave velocity as a function of depth along a profile.

The interpretation of seismic refraction data depends on a number of assumptions including:

The subsurface is composed of a series of discrete homogeneous layers, which may vary laterally in seismic velocity;

The boundaries between these layers consist of a significant seismic velocity contrast and are laterally continuous enough to be individually resolved;

B-2 AJO-CAG IFT Geotech Report (12-17-2014).docx

The thicknesses of these layers are great enough to critically refract seismic source energy to produce a detectable refracted wave arrival at the surface;

The seismic velocity of successive layers increases with depth.

In reality, all the assumptions above are unlikely to be completely fulfilled, and the extent to which each assumption is valid varies greatly from site to site. Consequently, the interpreted seismic refraction profiles typically show a simplified bulk average subsurface p-wave velocity distribution. The degree of simplification depends on the extent the above assumptions are violated at the site.

The seismic refraction data were collected using a Geometrics S12 seismograph with 12 geophones. Geophones were linearly spaced at 20-foot intervals and were in line with the source. Pressure-waves were produced by striking a ground plate with a sledgehammer. The p-wave source was nominally placed at the center of each line, at each end, and offset approximately 110 feet beyond each end, yielding a maximum source-receiver distance of about

330 feet. With this configuration, the maximum seismic refraction exploration depth was on the order of approximately 100 feet.

Seismic refraction travel times were plotted on time-distance graphs and interpreted using time-term methods (the generalized reciprocal method). The resulting seismic refraction models represent the rock and soil depths and velocities, which would account for the measured travel times. Velocity profiles of the seismic refraction measurements are presented on Figures B-1 through B-17.

B.3 Electrical Resistivity Soundings

The electrical resistivity method involves the measurement of the apparent resistivity of subsurface geologic layers. The apparent resistivity is a type of average of different resistivities in the measurement zone. An electrical current is introduced into the ground with a pair of electrodes, and the resulting potential difference is measured at the surface with a second pair of electrodes. The apparent resistivity is calculated from the measured ground resistance

(calculated for the induced current and measured potential difference) and geometrical relationships of the electrodes.

The electrical resistivity soundings were collected using four electrodes (two current electrodes and two potential electrodes) configured in a Wenner array. Five Wenner arrays were performed

B-3 AJO-CAG IFT Geotech Report (12-17-2014).docx at each of the 16 proposed IFT sites for a total of 80 soundings. Each sounding consisted of four measurements with electrode (pin) spacings of 5, 10, 15, and 20 feet. An L and R

Instruments Mini-Res resistivity meter was used to collect the resistivity measurements. The calculated apparent resistivity for each sounding is summarized in Table B-1.

Table B1 - RESISTIVITY RESULTS

IFT SITE #

SOUNDING

ID

MEASURED RESISTANCE (ohm) APPARENT RESISTIVITY (ohm-cm)

5-ft 10-ft 15-ft 20-ft 5-ft 10-ft 15-ft 20-ft

AJO-446

W1 28.4 17.6 14.1 12.9 27,200 33,700 40,500 49,400

W2 34.3 18.0 13.8 12.0 32,800 34,500 39,600 46,000

W3 57.5 22.4 14.5 5.3 55,100 42,900 41,700 20,300

W4 50.0 48.6 29.1 17.5 47,900 93,100 83,600 67,000

W5 76.9 30.6 20.1 10.2 73,600 58,600 57,700 39,100

AJO-448

W1 1.0 0.5 0.3 0.2 900 1,000 900 800

W2 0.8 0.4 0.3 0.2 800 800 800 800

W3 0.9 0.6 0.4 0.3 900 1,100 1,100 1,100

W4 0.9 0.5 0.3 0.2 900 900 800 800

W5 0.5 0.2 0.2 0.1 500 500 500 500

AJO-450

W1 29.4 14.5 9.1 8.5 28,200 27,800 26,100 32,600

W2 35.3 19.4 11.1 9.1 33,800 37,200 31,900 34,900

W3 53.7 17.8 11.4 8.2 51,400 34,100 32,700 31,400

W4 23.7 17.7 13.6 9.4 22,700 33,900 39,100 36,000

W5 62.1 22.5 13.9 10.4 59,500 43,100 39,900 39,800

AJO-452

W1 7.4 4.6 3.4 2.4 7,100 8,800 9,800 9,200

W2 4.0 2.4 2.0 1.7 3,800 4,600 5,700 6,500

W3 3.5 2.5 2.0 1.7 3,400 4,800 5,700 6,500

W4 8.3 4.2 3.3 2.6 7,900 8,000 9,500 10,000

W5 14.5 8.7 5.8 4.2 13,900 16,700 16,700 16,100

AJO-454

W1 33.0 10.9 5.2 2.8 31,600 20,900 14,900 10,700

W2 17.6 5.4 2.4 1.5 16,900 10,300 6,900 5,700

W3 25.6 7.2 2.8 1.5 24,500 13,800 8,000 5,700

W4 19.7 7.0 2.3 1.3 18,900 13,400 6,600 5,000

W5 24.7 5.8 2.1 1.2 23,700 11,100 6,000 4,600

AJO-458

W1 16.1 7.7 4.0 2.9 15,400 14,800 11,400 11,000

W2 14.8 7.1 3.8 3.4 14,200 13,600 11,000 12,900

W3 16.6 6.6 5.5 4.2 15,900 12,600 15,800 16,100

W4 17.1 7.0 4.9 3.6 16,400 13,400 14,000 13,900

W5 23.8 11.9 7.2 4.8 22,800 22,800 20,800 18,300

B-4 AJO-CAG IFT Geotech Report (12-17-2014).docx

IFT SITE #

SOUNDING

ID

MEASURED RESISTANCE (ohm) APPARENT RESISTIVITY (ohm-cm)

5-ft 10-ft 15-ft 20-ft 5-ft 10-ft 15-ft 20-ft

AJO-460

W1 12.3 5.1 2.9 1.9 11,800 9,800 8,300 7,300

W2 14.2 4.5 3.1 2.0 13,600 8,600 8,900 7,700

W3 12.4 5.5 3.4 2.2 11,900 10,500 9,800 8,400

W4 10.5 3.9 2.6 1.8 10,100 7,500 7,500 6,900

W5 11.8 4.1 3.2 2.1 11,300 7,900 9,200 8,000

AJO-462

W1 10.4 3.8 2.5 2.0 10,000 7,300 7,200 7,700

W2 9.8 3.5 2.3 1.9 9,400 6,700 6,600 7,300

W3 11.2 4.1 2.6 2.1 10,700 7,900 7,500 8,000

W4 10.9 3.6 2.6 2.3 10,400 6,900 7,500 8,800

W5 14.4 4.8 2.6 2.0 13,800 9,200 7,500 7,700

CAG-0430

W1 30.4 10.4 5.2 4.0 29,100 19,900 14,900 15,300

W2 53.4 15.3 8.2 5.5 51,100 29,300 23,600 21,100

W3 25.1 7.1 3.5 2.7 24,000 13,600 10,100 10,300

W4 36.2 11.5 4.9 2.9 34,700 22,000 14,100 11,100

W5 32.2 11.1 4.9 3.1 30,800 21,300 14,100 11,900

CAG-0432

W1 2.7 2.2 1.8 1.7 2,600 4,200 5,200 6,500

W2 6.8 5.0 3.5 3.1 6,500 9,600 10,100 11,900

W3 1.0 1.0 1.1 6.2 1,000 1,900 3,100 23,700

W4 5.2 2.6 2.3 1.4 5,000 5,000 6,600 5,400

W5 6.5 3.4 2.3 1.7 6,200 6,500 6,600 6,500

CAG-0434

W1 32.3 12.0 6.3 5.7 30,900 23,000 18,100 21,800

W2 18.4 11.1 6.3 3.8 17,600 21,300 18,100 14,600

W3 14.7 7.0 5.0 5.0 14,100 13,400 14,400 19,200

W4 14.1 5.5 5.1 3.0 13,500 10,500 14,700 11,500

W5 24.6 10.8 6.1 5.3 23,600 20,700 17,500 20,300

CAG-0436

W1 12.3 6.7 4.4 3.3 11,800 12,800 12,600 12,600

W2 10.3 6.8 4.3 2.8 9,900 13,000 12,400 10,700

W3 14.7 7.1 4.6 3.4 14,100 13,600 13,200 13,000

W4 10.6 6.3 3.4 2.7 10,200 12,100 9,800 10,300

W5 8.4 5.0 3.7 2.7 8,000 9,600 10,600 10,300

CAG-0438

W1 16.3 6.3 4.0 2.2 15,600 12,100 11,500 8,400

W2 8.7 4.3 3.8 2.7 8,300 8,200 10,900 10,300

W3 9.9 4.9 2.9 2.2 9,500 9,400 8,300 8,400

W4 10.9 4.9 2.7 1.7 10,400 9,400 7,800 6,500

W5 8.4 4.2 3.0 2.4 8,000 8,000 8,600 9,200

B-5 AJO-CAG IFT Geotech Report (12-17-2014).docx

IFT SITE #

SOUNDING

ID

MEASURED RESISTANCE (ohm) APPARENT RESISTIVITY (ohm-cm)

5-ft 10-ft 15-ft 20-ft 5-ft 10-ft 15-ft 20-ft

CAG-0440

W1 13.4 7.8 5.6 3.7 12,800 14,900 16,100 14,200

W2 21.4 10.9 6.3 4.1 20,500 20,900 18,100 15,700

W3 18.6 7.7 4.6 3.2 17,800 14,700 13,200 12,300

W4 30.2 21.5 6.0 3.8 28,900 41,200 17,200 14,600

W5 17.9 7.8 4.9 3.5 17,100 14,900 14,100 13,400

CAG-0442

W1 12.7 2.7 1.6 1.3 12,200 5,200 4,600 5,000

W2 7.2 2.7 1.7 1.6 6,900 5,200 4,900 6,100

W3 5.4 2.4 1.5 1.1 5,200 4,600 4,300 4,200

W4 8.3 2.0 1.2 0.8 7,900 3,800 3,400 3,100

W5 5.8 4.3 2.1 1.4 5,600 8,200 6,000 5,400

CAG-0444

W1 24.8 8.4 2.2 2.0 23,700 16,100 6,300 7,700

W2 27.4 8.0 4.9 2.5 26,200 15,300 14,100 9,600

W3 31.3 9.0 6.5 5.8 30,000 17,200 18,700 22,200

W4 32.0 8.8 5.9 2.4 30,600 16,900 16,900 9,200

W5 28.3 7.6 4.1 3.7 27,100 14,600 11,800 14,200

B.4 Surveyed Locations of Geophysical Surveys

The latitude and longitude of the geophysical surveys were measured using a handheld global positioning system (GPS; Garmin – Montana 650t). The survey coordinates for the seismic refraction line end points are tabulated in Table B-2, and the survey coordinates for the center of the Wenner array electrical resistivity soundings are tabulated in Table B-3.

B-6 AJO-CAG IFT Geotech Report (12-17-2014).docx

Table B2 - SEISMIC REFRACTION SURVEYS

HANDHELD GPS SURVEYED COORDINATES

IFT SITE # LATITUDE LONGITUDE

AJO-446 31.76691497 -112.257912

31.76748603 -112.258157

AJO-448 31.77229296 -112.41949

31.77177203 -112.419795

AJO-450 31.80880303 -112.541764

31.80823004 -112.541919

AJO-452 31.926954 -112.575068

31.92700597 -112.574361

AJO-454 31.97163097 -112.582646

31.97144698 -112.582002

AJO-458 32.11821 -112.633577

32.11798604 -112.634238

AJO-460 32.15720404 -112.693571

32.157269 -112.692867

AJO-462 32.05292302 -112.6136

CAG-0430 31.57310802 -111.684898

31.57268104 -111.685364

CAG-0432 31.584007 -111.77085

31.58340996 -111.770718

CAG-0434 31.61819302 -111.839311

31.61822403 -111.838631

CAG-0436 31.65771503 -111.911916

31.65718102 -111.912288

CAG-0438 31.65106902 -111.990151

31.650907 -111.990855

CAG-0440 31.67304201 -112.049681

31.67327603 -112.049026

CAG-0442 31.73479702 -112.114571

31.73532399 -112.114897

CAG-0444

31.62075704 -111.904567

31.62046703 -111.905176

32.05231399 -112.613567

Vamori Wash 31.55874797 -111.782818

Crossing 31.55853599 -111.782183

B-7 AJO-CAG IFT Geotech Report (12-17-2014).docx

Table B3 - WENNER ARRAY ELECTRICAL RESISTIVITY SOUNDINGS

HANDHELD GPS SURVEYED COORDINATES

TOWER # SOUNDING ID LATITUDE LONGITUDE

AJO-446

W1 31.76723298 -112.258132

W2 31.76711303 -112.25802

W3 31.76728 -112.257936

W4 31.76744596 -112.258205

W5 31.76736499 -112.258353

AJO-448

W1 31.77205198 -112.419691

W2 31.77188401 -112.419473

W3 31.77203103 -112.419814

W4 31.772256 -112.419687

W5 31.772155 -112.419429

AJO-450

W1 31.80857797 -112.54168

W2 31.80833397 -112.541598

W3 31.808324 -112.541803

W4 31.80854998 -112.541778

W5 31.80859197 -112.541928

AJO-452

W1 31.92714301 -112.574866

W2 31.92713899 -112.574546

W3 31.92687797 -112.574597

W4 31.92700404 -112.574755

W5 31.92689097 -112.574832

AJO-454

W1 31.97137004 -112.582375

W2 31.971393 -112.582015

W3 31.97163398 -112.582134

W4 31.97146299 -112.582271

W5 31.97166299 -112.582418

AJO-458

W1 32.11816398 -112.634122

W2 32.11822903 -112.633841

W3 32.11802501 -112.633775

W4 32.11793298 -112.634032

W5 32.11804898 -112.63398

B-8 AJO-CAG IFT Geotech Report (12-17-2014).docx

TOWER # SOUNDING ID LATITUDE LONGITUDE

AJO-460

W1 32.15743303 -112.693059

W2 32.157441 -112.693364

W3 32.15719197 -112.693282

W4 32.15717998 -112.692968

W5 32.15731803 -112.693168

AJO-462

W1 32.05260803 -112.613641

W2 32.05260602 -112.613879

W3 32.05249697 -112.613688

W4 32.05256201 -112.613401

W5 32.05276603 -112.613511

CAG-0430

W1 31.573091 -111.685112

W2 31.57306401 -111.685396

W3 31.57284197 -111.685261

W4 31.57289604 -111.685021

W5 31.57292697 -111.685253

CAG-0432

W1 31.583561 -111.770722

W2 31.58340996 -111.770876

W3 31.58349998 -111.770569

W4 31.58374901 -111.770962

W5 31.58372504 -111.770778

CAG-0434

W1 31.61820098 -111.839014

W2 31.61798196 -111.839156

W3 31.61805304 -111.838893

W4 31.61829896 -111.838818

W5 31.61828798 -111.839173

CAG-0436

W1 31.65748696 -111.91208

W2 31.65768502 -111.912115

W3 31.65735201 -111.911825

W4 31.65734103 -111.912093

W5 31.65749501 -111.912242

B-9 AJO-CAG IFT Geotech Report (12-17-2014).docx

TOWER # SOUNDING ID LATITUDE LONGITUDE

CAG-0438

W1 31.65102602 -111.990359

W2 31.65113297 -111.990511

W3 31.65094597 -111.990539

W4 31.65079996 -111.990406

W5 31.65088101 -111.990212

CAG-0440

W1 31.67309901 -112.049573

W2 31.673041 -112.049445

W3 31.67328198 -112.049285

W4 31.67314704 -112.04922

W5 31.67330797 -112.049594

CAG-0442

W1 31.73494597 -112.114695

W2 31.735081 -112.114532

W3 31.735138 -112.11476

W4 31.73503599 -112.114965

W5 31.73483499 -112.114821

CAG-0444

W1 31.620692 -111.904711

W2 31.62050701 -111.904715

W3 31.62056099 -111.904892

W4 31.62072401 -111.905009

W5 31.62084103 -111.904857

2,500

5,880 6,900

6,450 8,330

8,630

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-446

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHEASTNORTHWEST

APPROXIMATE DEPTH

OF EXPLORATION

Figure B-1. Tower AJO-446 - Seismic Refraction Profile

1,000

1,330 1,370 1,360 1,330

2,580

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-448

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHWESTNORTHEAST

APPROXIMATE DEPTH

Figure B-2. Tower AJO-448 - Seismic Refraction Profile

4,990 5,780

4,590 5,210

5,820

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-450

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHWESTNORTHEAST

APPROXIMATE DEPTH

Figure B-3. Tower AJO-450 - Seismic Refraction Profile

1,100

2,540 2,800 2,600 2,370

4,490

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-452

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

EASTWEST

APPROXIMATE DEPTH

Figure B-4. Tower AJO-452 - Seismic Refraction Profile

1,200

2,450 2,570

2,660 1,960

3,140

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-454

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHEASTNORTHWEST

APPROXIMATE DEPTH

Figure B-5. Tower AJO-454 - Seismic Refraction Profile

1,250

3,390 3,500 3,340 3,360

5,310

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-458

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

NORTHEASTSOUTHWEST

APPROXIMATE DEPTH

Figure B-6. Tower AJO-458 - Seismic Refraction Profile

1,150

2,860 3,000

2,410 2,800

4,070

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-460

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

WESTEAST

APPROXIMATE DEPTH

Figure B-7. Tower AJO-460 - Seismic Refraction Profile

3,190 3,320 3,470 3,300

4,490

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER AJO-462

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHNORTH

APPROXIMATE DEPTH

Figure B-8 Tower AJO-462 - Seismic Refraction Profile

1,250

3,200 3,000 3,150 3,450

7,340

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-430

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHWESTNORTHEAST

APPROXIMATE DEPTH

Figure B-9. Tower CAG-430 - Seismic Refraction Profile

1,450

2,020 2,060

2,010 2,060

2,470

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-432

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHNORTH

APPROXIMATE DEPTH

Figure B-10. Tower CAG-432 - Seismic Refraction Profile

2,390 2,460 2,140 2,490

4,440

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-434

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

EASTWEST

APPROXIMATE DEPTH

Figure B-11. Tower CAG-434 - Seismic Refraction Profile

2,570 2,450 2,400 2,550

3,910

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-436

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHWESTNORTHEAST

APPROXIMATE DEPTH

Figure B-12. Tower CAG-436 - Seismic Refraction Profile

2,330 2,260 2,150 2,270

3,380

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-438

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

WESTEAST

APPROXIMATE DEPTH

Figure B-13. Tower CAG-438 - Seismic Refraction Profile

2,000 2,240 2,110 2,180

3,530

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-440

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

NORTHEASTSOUTHWEST

APPROXIMATE DEPTH

Figure B-14. Tower CAG-440 - Seismic Refraction Profile

1,950 2,090 2,370 2,070

2,890

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-442

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

NORTHWESTSOUTHEAST

APPROXIMATE DEPTH

Figure B-15. Tower CAG-442 - Seismic Refraction Profile

1,050

4,060 4,460 4,300 4,820

11,030

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

TOWER CAG-444

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHWESTNORTHEAST

APPROXIMATE DEPTH

Figure B-16. Tower CAG-444 - Seismic Refraction Profile

2,180 1,880 2,010 2,220

4,930

0 20 40 60 80 100 120 140 160 180 200 220 DISTANCE (feet)

E

LE

V A

TI

O

N (f ee t a bo ve

M S

L)

ACCESS ROAD RIVER WASH CROSSING

2,000

4,000

Seismic refraction pressure-wave interface shown in black, annotated with pressure-wave velocity in feet per second

LEGEND

HORIZONTAL AND VERTICAL SCALE: 1" = 30'

NO VERTICAL EXAGGERATION

SOUTHEASTNORTHWEST

APPROXIMATE DEPTH

Figure B-17. Access Road River Wash Crossing (South of Tower CAG-432) - Seismic Refraction Profile