Geology.pdf

PDF 4 MB Posted Sep 21, 2023

Attached to: Arkansas Valley Conduit (AVC) Injection Site
Solicitation number: 140R6023R0013
Issued by: Department of the Interior Bureau of Reclamation

About this file

Written by GovTribe AI · Dec 21, 2023

This document summarizes geotechnical exploration logs for a proposed Arkansas Valley Conduit injection site. The logs document soil borings and monitoring well installations conducted by the Bureau of Reclamation at six locations along Highway 96 near Avondale, Colorado between February and March 2023. The borings encountered native alluvial soils including clays, silts, sands and gravels to depths between 9-42 feet below ground surface. One boring was extended to 53 feet and cored through Cretaceous Pierre Shale bedrock. Logs document soil stratigraphy and properties, depth to groundwater, standard penetration testing results, and laboratory soil classification data. Monitoring wells were installed at five locations to specified design standards for future geotechnical monitoring.

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38°16'30" 38°16'20" 38°16'10" 38°16' 38°15'50" 38°15'40" 38°15'30" 38°15'20"

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38°16'5" 38°16'4" 38°16'3" 38°16'2" 38°16'1" 38°16' 38°15'59" 38°15'58"

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State Hwy 96

State Hwy 96 4545

ISDH-23-1ISDH-23-1A

ISDH-23-2

ISDH-23-3

ISDH-23-4

ISDH-23-5

ISDH-23-6

ISTP-23-1

ISTP-23-2

ISTP-23-3

ISTP-23-4

ISTP-23-5

ISTP-23-6

ISTP-23-7

ISTP-23-8

ISTP-23-9

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-104°22'58"-104°22'59"-104°23'-104°23'1"-104°23'2"-104°23'3"-104°23'4"-104°23'5"-104°23'6"

FRYINGPAN-ARKANSAS PROJECT,

ARKANSAS VALLEY CONDUIT

Chemical Injection Site - Surface Geology

USBR - MB GIS & MB GEOLOGY

North American Datum 1983 (2011) Scale = 1:1,300 1 inch = 108.33 feet

0 30 60 90 12015 US Feet

Field survey data points and geologic mapping from USBR with NAIP imagery. DEM generated vertical contour profile by MB GIS.

Legend

AVC Chemical Injection Site 2023

10 ft Drill Hole

30 ft Drill Hole

Bedrock +10 ft Drill Hole

Test Pit

Contours - US Feet

Artificial Fill (af)

Quaternary

Alluvium (Qal)

Map 4A: 2023 AVC Chemical Injection Site explorations.

St at e H w y

St at e

H w y

H -2

3- 1A

H -2

-2 3-

-2

-2 3-

4 IS

-2 3-

-2

-2 3-

38°16'4" 38°16'3" 38°16'2" 38°16'1" 38°16' 38°15'59" 38°15'58" 38°15'57"

38°16'5" 38°16'4" 38°16'3" 38°16'2" 38°16'1" 38°16' 38°15'59" 38°15'58"

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State Hwy 96

State Hwy 96 4545

ISDH-23-1ISDH-23-1A

ISDH-23-2

ISDH-23-3

ISDH-23-4

ISDH-23-5

ISDH-23-6

ISTP-23-1

ISTP-23-2

ISTP-23-3

ISTP-23-4

ISTP-23-5

ISTP-23-6

ISTP-23-7

ISTP-23-8

ISTP-23-9

°1 6'

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-104°22'58"-104°22'59"-104°23'-104°23'1"-104°23'2"-104°23'3"-104°23'4"-104°23'5"-104°23'6"

FRYINGPAN-ARKANSAS PROJECT,

ARKANSAS VALLEY CONDUIT

Chemical Injection Site - Surface Geology

USBR - MB GIS & MB GEOLOGY

North American Datum 1983 (2011) Scale = 1:1,300 1 inch = 108.33 feet

0 30 60 90 12015 US Feet

Field survey data points and geologic mapping from USBR with NAIP imagery. DEM generated vertical contour profile by MB GIS.

Legend

AVC Chemical Injection Site 2023

10 ft Drill Hole

30 ft Drill Hole

Bedrock +10 ft Drill Hole

Test Pit

Contours - US Feet

Artificial Fill (af)

Quaternary

Alluvium (Qal)

Map 5A: 2023 AVC Chemical Injection Site explorations.

38°19' 38°18' 38°17' 38°16' 38°15' 38°14' 38°13'

38°20' 38°19' 38°18' 38°17' 38°16' 38°15' 38°14' 38°13'

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B o o n e R e a ch

S u rf a ce G e o lo g y

M B

B G

G Y

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D a ta se t, D

E le va ti o n

P ro g ra m , G eo g ra p h ic

N a m es

In fo rm a ti o n Sy st em

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C o ve r

D a ta b a se

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B o on e Re ac h f t D ril l H ol e

(3 f t D ril l H ol e

(1 3) f t D ril l H ol e

Te st

P it

Q ua te rn ar y

Al lu vi um

Q al

Co llu vi um

Q c)

Al lu vi al

T er ra ce

Q at

Cr et ac eo us

Pi er re S ha le

Sh al e

Pi er re S ha le

Li m es to ne

Pi er re S ha le

D ia ge ne si s an d

Co nc re tio ns

M ap

B oo ne R ea ch a lig nm en t ex pl or at io

R ai lw ay

Co m pa ny

St at e H w y

St at e

H w y

37th Ln

St at e H w y

36th Ln

St at e H w y

St at e

H w y

D H

-2 2-

-2

H -2

-2

D H

-2 2-

38°16'30" 38°16'25" 38°16'20" 38°16'15"

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C T, A R

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B o o n e R e a ch

S u rf a ce G e o lo g y

M B

B G

G Y

N or th A m er ic an

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S Fe et

Fi el d s u rv ey d a ta p o in ts a n d g eo lo g ic m a p p in g f ro m U

R w it h N

im a g er y.

g en er a te d v er ti ca l c o nt o u r p ro fi le b y M

B G

Le ge nd

B o on e Re ac h f t D ril l H ol e f t D ril l H ol e f t D ril l H ol e

Te st

P it

Co nt ou rs

S Fe et

Ar tif ic ia l F ill af

Q ua te rn ar y

Al lu vi um

Q al

M ap

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B oo ne

R ea ch a lig nm en t s ur fa ce g eo lo gy

Qal

0.0 to 42.3 ft.

QUATERNARY ALLUVIUM (Qal):

0.0 to 5.5 ft. LEAN CLAY CL: Approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine sand, subangular to subrounded; maximum size fine sand; moist; brown; hard; strong HCl reaction;

contained microcrystalline gypsum and roots.

5.5 to 10.3 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 85% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 15% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; hard; strong HCl reaction.

Lab Test Data: 8.6 to 10.1 ft. 96.0% fines, 4.0% sand, LL=39.0, PI=23.0, MC=7.0%, Lab Classification = Lean Clay CL.

10.3 to 10.4 ft. CLAYEY SAND SC: Approximately 85% fine to medium sand, predominantly medium, subangular to subrounded; approximately 15% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size medium sand; moist; tan; weak cementation; strong HCl reaction.

10.4 to 11.1 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 85% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 15% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; hard; strong HCl reaction.

11.1 to 22.6 ft. LEAN CLAY CL: Approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine sand, subangular to subrounded; maximum size fine sand; moist; brown; hard; strong HCl reaction;

contained microcrystalline gypsum and trace woody organics/charcoal.

(CL)s

LOCATION:

CO-96, 0.9 miles east of Nyberg Road, Avondale, CO.

PURPOSE OF HOLE:

To collect geotechnical data for the proposed Arkansas Valley Conduit (AVC) chemical injection site and install an observation well.

DRILLED BY:

USBR - MB Drill Crew (MB-2300) Cody Kelly - Driller Pete Shawver- Helper Ryan Dedeker - Helper Ransom Yates - Helper

DRILLING EQUIPMENT:

Truck Mounted CME-85 drill (blue).

4.25-inch ID, 9.0-inch OD Heavy Duty Hollow Stem Augers (HSA).

4-inch OD split spoon core barrel with 2.63-inch ID, 4-inch OD core barrel shoe and metal catcher, mounted on hexagonal rods via 4-inch OD bearing head.

CME automatic hammer with 2-feet-long, 1.5-inch ID, 2-inch OD SPT barrel with 1.375-inch ID SPT shoe and plastic catcher on NWJ rods.

CME automatic hammer with 1-foot-long, 2-inch ID, 2.5-inch OD California Sampler with 2-inch OD by 4-inch long brass liners and 1.94-inch ID shoe on NWJ rods.

HQ3 wireline coring with 2.41-inch ID, 3.763-inch OD bit.

DRILLING METHODS:

0.0 to 3.6 ft. - HSA with 3.6-feet continuous sample. Performed SPT at interval listed below.

3.6 to 41.1 ft. - HSA with 2.5-feet continuous samples. Performed SPT or California Sampler test at intervals listed below.

Coordinate System:

Colorado State Plane South (0503) US Survey Feet, NAD83

Continued next pageCOMMENTS:

All depths are feet below ground surface (bgs).

ID = inside diameter OD = outside diameter

ft. = feet depth HSA = Hollow Stem Auger SPT = Standard Penetration Test

CLASSIFICATION AND

NOTES

SHEET 1 OF 4

GROUND ELEVATION: 4550.4COORDINATES: N 1,584,774.3 E 3,320,355.9

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 37.6 (4588.00) 2/21/2023

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-1

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: 42.3

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/16/23 FINISHED: 2/20/23 TOTAL DEPTH: 53.4

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

D H

P J

L O

G _2

.G D

4/ 3/

Qal

22.6 to 27.3 ft. POORLY GRADED SAND SP:

Approximately 85% fine to coarse sand, hard, subangular to subrounded; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

approximately 5% nonplastic fines; maximum size 1-inch; moist; buff to tan; weak cementation; weak HCl reaction.

27.3 to 29.5 ft. SANDY LEAN CLAY s(CL):

Approximately 60% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 40% fine to medium sand, subangular to subrounded; maximum size medium sand; moist; brown; firm; weak HCl reaction;

contained iron oxide staining.

29.5 to 29.7 ft. POORLY GRADED SAND SP:

Approximately 85% fine to coarse sand, hard, subangular to subrounded; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

approximately 5% nonplastic fines; maximum size 1-inch; moist; buff to tan; weak cementation; weak HCl reaction; contained trace pieces of red weathered shale.

29.7 to 30.6 ft. SANDY LEAN CLAY s(CL):

contained iron oxide staining.

30.6 to 31.1 ft. POORLY GRADED SAND SP:

Approximately 85% fine to coarse sand, hard, subangular to subrounded; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

approximately 5% nonplastic fines; maximum size 1-inch; moist; buff to tan; weak cementation; weak HCl reaction; contained trace pieces of red weathered shale.

31.1 to 31.5 ft. SANDY LEAN CLAY s(CL):

contained iron oxide staining.

31.5 to 32.6 ft. POORLY GRADED SAND SP:

Approximately 85% fine to coarse sand, hard, subangular to subrounded; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

approximately 5% nonplastic fines; maximum size 1-inch; moist; buff to tan; weak cementation; weak HCl reaction; contained trace pieces of red weathered shale.

s(CL)

shale

41.1 to 43.1 ft. - HSA with 2.0-feet continuous sample.

43.1 to 43.9 ft. - HSA into bedrock without continuous sample.

43.1 to 53.4 ft - HQ3 rock coring.

SPT & CALIFORNIA SAMPLER

INTERVALS AND RECOVERY:

3.6 to 5.1 ft. SPT No.1: 87%

6.1 to 7.6 ft. California No.1: 83%

8.6 to 10.1 ft. SPT No.2: 93%

11.1 to 12.6 ft. California No.2: 57%

13.6 to 15.1 ft. SPT No.3: 87%

16.1 to 17.6 ft. California No.3: 60%

18.6 to 20.1 ft. SPT No.4: 70%

21.1 to 22.6 ft. California No.4: 53%

23.6 to 25.1 ft. SPT No.5: 87%

26.1 to 27.6 ft. SPT No.6: 87%

28.6 to 30.1 ft. California No.5: 80%

31.1 to 32.6 ft. SPT No.7: 87%

33.6 to 35.1 ft. SPT No.8: 83%

36.1 to 37.6 ft. SPT No.9: 80%

38.6 to 40.1 ft. SPT No.10: 80%

41.1 to 42.6 ft. SPT No.11: 100%

SPT & CALIFORNIA SAMPLER

INTERVALS WITH BARREL SINK

PRIOR TO TESTING:

28.6 to 30.1 ft. California No.5: sank

0.2 ft.

38.6 to 40.1 ft. SPT No.10: sank 0.1 ft.

SPT SAMPLES SUBMITTED TO

LAB:

8.6 to 10.1 ft. SPT No.2

31.1 to 32.6 ft. SPT No.7

DRILLING FLUID:

No water added during HSA drilling.

HOLE COMPLETION:

Installed observation monitoring well.

Observation well developed utilizing surging and dual air-lift techniques.

53.4 to 43.1 ft. - Backfilled hole with 3/8-inch bentonite chips.

43.1 to 42.6 ft. - Installed well sump using blank 2-inch SCH 40 PVC.

42.6 to 37.6 ft. - Installed .010 screen 2-inch SCH 40 PVC.

37.6 to 0.24 ft. - Installed blank 2-inch

SCH 40 PVC.

43.1 to 35.6 ft. - Backfilled hole with 10/20 silica sand for screening.

35.6 to 2.0 ft. - Backfilled hole with 3/8-inch bentonite chips.

2.0 to 1.0 ft. - Backfilled hole with 10/20 silica sand.

1.0 to 0.0 ft. - Concrete with observation well flush mount vault.

CLASSIFICATION AND

NOTES

SHEET 2 OF 4

GROUND ELEVATION: 4550.4COORDINATES: N 1,584,774.3 E 3,320,355.9

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 37.6 (4588.00) 2/21/2023

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-1

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: 42.3

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/16/23 FINISHED: 2/20/23 TOTAL DEPTH: 53.4

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

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Lab Test Data: 31.1 to 32.6 ft. 7.0% fines, 93.0% sand, nonplastic, Cu=6.79, Cc=1.26, MC=2.3%, Lab Classification = Well Graded Sand with Silt SW-SM.

32.6 to 32.8 ft. SANDY LEAN CLAY s(CL):

contained iron oxide staining.

32.8 to 42.3 ft. POORLY GRADED SAND SP:

Approximately 85% fine to coarse sand, hard, subangular to subrounded; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

approximately 5% nonplastic fines; maximum size 1-inch; 32.8 to 37.1 ft. moist, 37.1 to 42.3 ft. wet; buff to tan; weak cementation; weak HCl reaction;

contained trace pieces of red weathered shale.

42.3 to 53.4 ft.

CRETACEOUS PIERRE SHALE (Kp):

42.3 to 53.4 ft. SHALE: 42.3 to 42.6 ft. moist, 42.6 to 43.1 ft. dry to moist; 43.1 to 53.4 ft. dry; gray to dark gray, weathers to brown; 42.3 to 42.6 ft. very intensely weathered (W8), 42.6 to 44.3 ft. moderately weathered (W5), 44.3 to 45.6 ft. slightly weathered (W3), 45.6 to 53.4 ft. fresh (W1); 42.3 to 44.3 ft. very soft (H7), 44.3 to 45.6 ft. soft (H6), 45.6 to 53.4 ft.

moderately hard (H4); core recovery unfractured (FD0) to very intensely to intensely fractured (FD8);

bedding plane separation slightly rough (R4) to predominantly smooth (R5); core separates along bedding planes; fissile, laminated; twenty-four hour water slake test produce no discernable disaggregation, multiple wet-dry cycles were found to produce rapid disaggregation in a water slake test;

weak HCl reaction on disaggregated grains;

contained occasional baculite and bivalve fossils.

Descriptive summary:

43.70 ft. - 90° mechanical break

44.29 ft. - 90° mechanical break

46.23 ft. - 90° mechanical break

47.18 ft. - 90° mechanical break

47.24 ft. - 90° mechanical break

48.49 ft. - 90° mechanical break

48.59 ft. - 90° mechanical break

48.86 ft. - 90° mechanical break

49.2 to 50.4 ft. - 3° fracture, O2, T1, W2

49.50 ft. - 90° mechanical break

49.77 ft. - 90° mechanical break

49.90 ft. - 74° fracture, O0, T0, W2

50.07 ft. - 90° mechanical break

50.31 ft. - 90° mechanical break

50.4 to 52.05 ft. - 3° fracture, O1, T1, W2

51.32 ft. - 80° fracture, O0, T0, W2

51.68 ft. - 90° mechanical break

51.87 ft. - 66° mechanical break

BOTTOM OF HOLE

shale

6 bags 50lb 10/20 silica sand.

18 bags 50lb 3/8-inch bentonite chips.

2 bag 60lb concrete.

6-inch by 10-inch flush mount and locking well cap.

DRILLING CONDITIONS &

COMMENTS:

None.

WATER LEVELS:

2/16/2023 - 37.5 ft. bgs during HSA drilling.

2/21/2023 - 37.6 ft. bgs after well development.

CLASSIFICATION AND

NOTES

SHEET 3 OF 4

GROUND ELEVATION: 4550.4COORDINATES: N 1,584,774.3 E 3,320,355.9

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 37.6 (4588.00) 2/21/2023

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-1

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: 42.3

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/16/23 FINISHED: 2/20/23 TOTAL DEPTH: 53.4

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

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52.25 ft. - 75° mechanical break

52.34 ft. - 105° fracture, O0, T0, W2

53.07 ft. - 50° fracture, O0, T0, W2

53.48 ft. - 55° fracture, O0, T0, W2

CLASSIFICATION AND

NOTES

SHEET 4 OF 4

GROUND ELEVATION: 4550.4COORDINATES: N 1,584,774.3 E 3,320,355.9

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 37.6 (4588.00) 2/21/2023

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-1

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: 42.3

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/16/23 FINISHED: 2/20/23 TOTAL DEPTH: 53.4

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

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P J

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*NOT TO SCALE

NOTES: All measurements are depth below ground surface unless noted otherwise.

T.O.C. = Top of (PVC) well casing

G.S. = Ground surface

ID = inside diameter

OD = outside diameter

T.O.C. ELEVATION:

G.S. ELEVATION:

ISDH-23-1 OBSERVATION WELL DIAGRAM

PROJECT: Fryingpan-Arkansas GEOLOGIST: Eric Hammers, Kelsey Wetzel FEATURE: Chemical Injection Site DRILLER: Cody Kelly

DATE COMPLETED: 2/20/2023 HELPERS: Pete Shawver, Ryan Dedeker, Ransom Yates

3/8" Bentonite Chips

10x20 Sand

2" ID x 2.4" OD Schedule 40 PVC

Glue on Cap

Schedule 40 PVC

Well Cap (Expandable and Lockable)

Well Screen 2" ID x 2.4" OD Schedule 40 PVC Slot size = 0.010"

53.4' --Total depth of drill hole

37.6' --Top of screen

35.6' --Top of sand pack / Bottom of bentonite

Ground Surface

Concrete

10x20 Sand (Drainage for Flush Mount)

3/8" Bentonite Chips

43.1' --Bottom of well/Top of bentonite/

Bottom of sand pack

1.0' --Bottom of concrete

2.0' --Top of bentonite / Bottom of standpipe filter drain

3.76"

6" x 10" Traffic-Rated Flush Mount Vault (lid secured with bolts) Flush with ground surface

2" PVC Sump

Schedule 40 PVC

42.6' --Bottom of screen

0.24' --Top of Casing

Well Casing

Qal

0.0 to 9.0 ft.

QUATERNARY ALLUVIUM (Qal):

contained microcrystalline gypsum and roots.

5.5 to 9.0 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 85% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 15% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; hard; strong HCl reaction.

BOTTOM OF HOLE

(CL)s

LOCATION:

CO-96, 0.9 miles east of Nyberg Road, Avondale, CO.

PURPOSE OF HOLE:

To collect geotechnical data for the proposed Arkansas Valley Conduit (AVC) chemical injection site.

DRILLED BY:

USBR - MB Drill Crew (MB-2300) Cody Kelly - Driller Pete Shawver- Helper Ryan Dedeker - Helper Ransom Yates - Helper

DRILLING EQUIPMENT:

Truck Mounted CME-85 drill (blue).

4.25-inch ID, 9.0-inch OD Heavy Duty Hollow Stem Augers (HSA).

4-inch OD split spoon core barrel with 2.63-inch ID, 4-inch OD core barrel shoe, mounted on hexagonal rods via 4-inch OD bearing head.

DRILLING METHODS:

0.0 to 4.0 ft. - HSA with 4.0-feet continuous sample.

4.0 to 9.0 ft. - HSA with 5.0-feet continuous sample.

DRILLING FLUID:

No water added.

HOLE COMPLETION:

9.0 to 0.0 ft. - Backfilled hole with 3/8-inch bentonite chips.

4 bags 50lb 3/8-inch bentonite chips.

DRILLING CONDITIONS &

COMMENTS:

None.

WATER LEVELS:

Not encountered.

Coordinate System:

Colorado State Plane South (0503) US Survey Feet, NAD83

COMMENTS:

All depths are feet below ground surface (bgs).

ID = inside diameter OD = outside diameter

ft. = feet depth HSA = Hollow Stem Auger SPT = Standard Penetration Test

CLASSIFICATION AND

NOTES

SHEET 1 OF 1

GROUND ELEVATION: 4550.5COORDINATES: N 1,584,773.5 E 3,320,350.8

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-1A

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/17/23 FINISHED: 2/17/23 TOTAL DEPTH: 9.0

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

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Qal

0.0 to 30.7 ft.

QUATERNARY ALLUVIUM (Qal):

0.0 to 11.0 ft. LEAN CLAY CL: 0.0 to 0.4 ft. topsoil;

approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine to medium sand, predominantly fine, subangular to subrounded;

maximum size medium sand; moist; brown; hard;

strong HCl reaction; contained microcrystalline gypsum.

Lab Test Data: 9.2 to 10.7 ft. 88.0% fines, 12.0% sand, LL=33.1, PI=3.6, MC=8.2%, Lab Classification = Silt ML.

11.0 to 11.1 ft. SILTY SAND SM: Approximately 85% fine to medium sand, subangular to subrounded; approximately 15% nonplastic fines;

maximum size medium sand; moist; brown; weak cementation; strong HCl reaction.

11.1 to 12.3 ft. SANDY LEAN CLAY s(CL):

Approximately 55% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 45% fine to medium sand, predominantly fine, subangular to subrounded;

maximum size medium sand; moist; brown; hard;

strong HCl reaction.

12.3 to 12.8 ft. LEAN CLAY CL: Approximately 90% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 10% fine to medium sand, predominantly fine, subangular to subrounded; maximum size medium sand; moist; brown; hard; strong HCl reaction;

contained microcrystalline gypsum.

12.8 to 13.0 ft. CLAYEY SAND SC: Approximately 65% fine to medium sand, predominantly fine, subangular to subrounded; approximately 35% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size medium sand; moist; light brown; moderate cementation; strong HCl reaction; contained micas.

s(CL)

LOCATION:

CO-96, 0.9 miles east of Nyberg Rd, Avondale, CO.

PURPOSE OF HOLE:

To collect geotechnical data for the proposed Arkansas Valley Conduit (AVC) chemical injection site.

DRILLED BY:

USBR - MB Drill Crew (MB-2300) Cody Kelly - Driller Ryan Dedeker - Helper Pete Shawver - Helper Ransom Yates - Helper

DRILLING EQUIPMENT:

Truck Mounted CME-85 drill (yellow).

4.25-inch ID, 9.0-inch OD Heavy Duty Hollow Stem Augers (HSA).

4-inch OD split spoon core barrel with 2.63-inch ID, 4-inch OD core barrel shoe and metal catcher, mounted on hexagonal rods via 4-inch OD bearing head.

CME automatic hammer with 2-feet-long, 1.5-inch ID, 2-inch OD SPT barrel with 1.375-inch ID SPT shoe and plastic catcher on NWJ rods.

CME automatic hammer with 1-foot-long, 2-inch ID, 2.5-inch OD California Sampler with 2-inch OD by 4-inch long brass liners and 1.93-inch ID shoe on NWJ rods.

DRILLING METHODS:

0.0 to 2.5 ft. - HSA with 2.5-feet continuous sample.

2.5 to 4.2 ft. - HSA with 1.7-feet continuous sample.

4.2 to 30.7 ft. - HSA with 2.5-feet continuous samples. Performed SPT or California Sampler test at intervals listed below.

Coordinate System:

Colorado State Plane South (0503) US Survey Feet, NAD83

Continued next pageCOMMENTS:

All depths are feet below ground surface (bgs).

ID = inside diameter OD = outside diameter

ft. = feet depth HSA = Hollow Stem Auger SPT = Standard Penetration Test

CLASSIFICATION AND

NOTES

SHEET 1 OF 3

GROUND ELEVATION: 4548.5COORDINATES: N 1,584,699.2 E 3,320,440.6

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-2

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/6/23 FINISHED: 2/6/23 TOTAL DEPTH: 30.7

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

D H

P J

L O

G _2

Qal

13.0 to 13.3 ft. LEAN CLAY CL: Approximately 90% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 10% fine to medium sand, subangular to subrounded; maximum size medium sand; moist;

brown; hard; strong HCl reaction.

13.3 to 14.2 ft. CLAYEY SAND SC: Approximately 55% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 45% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; trace fine gravel, hard, subangular to subrounded; maximum size 3/8-inch; moist; light brown; weak cementation;

strong HCl reaction; contained micas.

14.2 to 17.6 ft. LEAN CLAY CL: Approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine to medium sand, predominantly fine, subangular to subrounded; maximum size medium sand; moist;

brown; hard; strong HCl reaction; contained microcrystalline gypsum.

17.6 to 17.8 ft. CLAYEY SAND SC: Approximately 70% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 30% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size coarse sand; moist; light brown; weak cementation;

strong HCl reaction.

17.8 to 20.8 ft. LEAN CLAY CL: Approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine sand, subangular to subrounded; maximum size fine sand; moist; brown; hard; strong HCl reaction;

contained woody organics/charcoal.

20.8 to 21.7 ft. SILTY SAND SM: Approximately 85% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 15% nonplastic fines; trace fine gravel, hard, subangular to subrounded; maximum size 1/2-inch; moist; light brown; weak cementation; strong HCl reaction;

contained micas.

21.7 to 22.7 ft. CLAYEY SAND SC: Approximately 55% fine to medium sand, predominantly fine, subangular to subrounded; approximately 45% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size medium sand; moist; tan to brown; stratified lenses to 2.0-inches thick; weak cementation; weak to strong HCl reaction; contained iron oxide staining.

BOTTOM OF HOLE

SP/(CL)s s(CL)

s(CL)

SPT & CALIFORNIA SAMPLER

INTERVALS AND RECOVERY:

4.2 to 5.7 ft. SPT No.1: 73%

6.7 to 8.2 ft. California No.1: 80%

9.2 to 10.7 ft. SPT No.2: 100%

11.7 to 13.2 ft. California No.2: 80%

14.2 to 15.7 ft. SPT No.3: 67%

16.7 to 18.2 ft. California No.3: 67%

19.2 to 20.7 ft. SPT No.4: 77%

21.7 to 23.2 ft. SPT No.5: 93%

24.2 to 25.7 ft. SPT No.6: 73%

26.7 to 28.2 ft. SPT No.7: 60%

29.2 to 30.7 ft. California No.4: 100%

SPT & CALIFORNIA SAMPLER

INTERVALS WITH BARREL SINK

PRIOR TO TESTING:

None.

SPT SAMPLES SUBMITTED TO

LAB:

9.2 to 10.7 ft. SPT No.2

26.7 to 28.2 ft. SPT No.7

DRILLING FLUID:

No water added during HSA drilling.

HOLE COMPLETION:

30.7 to 0.0 ft. - Backfilled hole with 3/8-inch bentonite chips.

15 bags 50lb 3/8-inch bentonite chips.

DRILLING CONDITIONS &

COMMENTS:

None.

CLASSIFICATION AND

NOTES

SHEET 2 OF 3

GROUND ELEVATION: 4548.5COORDINATES: N 1,584,699.2 E 3,320,440.6

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-2

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/6/23 FINISHED: 2/6/23 TOTAL DEPTH: 30.7

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

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22.7 to 27.8 ft. STRATIFIED: Stratified, sand with nonplanar clay lenses up to 0.1-feet thick.

POORLY GRADED SAND SP: approximately 95% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 5% nonplastic fines; trace fine gravel, hard, subangular to subrounded; maximum size 1/2-inch; moist; buff;

weak cementation; weak HCl reaction; contained iron oxide staining. LEAN CLAY WITH SAND (CL)s: approximately 85% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 15% fine sand, subangular to subrounded; maximum size fine sand;

moist; brown with black speckles; firm; strong HCl reaction; contained iron oxide staining.

Lab Test Data: 26.7 to 28.2 ft. 9.0% fines, 91.0% sand, nonplastic, Cu=12.0, Cc=3.0, MC=3.0%, Lab Classification = Well Graded Sand with Silt SW-SM.

27.8 to 28.3 ft. SANDY LEAN CLAY s(CL):

28.3 to 28.6 ft. LEAN CLAY CL: Approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine sand, subangular to subrounded; maximum size fine sand; moist; brown; firm; weak HCl reaction;

contained iron oxide staining.

28.6 to 28.8 ft. CLAYEY SAND SC: Approximately 65% fine sand, subangular to subrounded;

approximately 35% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size fine sand; moist; light brown; weak cementation; weak HCl reaction;

contained iron oxide staining.

28.8 to 30.0 ft. SANDY LEAN CLAY s(CL):

Approximately 65% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 35% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; soft; weak HCl reaction; contained iron oxide staining.

30.0 to 30.7 ft. POORLY GRADED SAND SP:

Approximately 95% fine to coarse sand, hard, subangular to subrounded; approximately 5% nonplastic fines; trace fine gravel, hard, subangular to subrounded; maximum size 1/4-inch; moist; light brown; weak cementation; weak HCl reaction.

CLASSIFICATION AND

NOTES

SHEET 3 OF 3

GROUND ELEVATION: 4548.5COORDINATES: N 1,584,699.2 E 3,320,440.6

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-2

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/6/23 FINISHED: 2/6/23 TOTAL DEPTH: 30.7

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

D H

P J

L O

G _2

Qal

0.0 to 30.9 ft.

QUATERNARY ALLUVIUM (Qal):

0.0 to 6.9 ft. LEAN CLAY CL: Approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine to medium sand, predominantly fine, subangular to subrounded; maximum size medium sand; moist;

brown; hard; strong HCl reaction; contained microcrystalline gypsum.

6.9 to 8.4 ft. CLAYEY SAND SC: Approximately 60% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 40% fines with medium dry strength, slow dilatancy, low plasticity, and medium toughness; maximum size coarse sand; moist; brown; weak cementation;

strong HCl reaction.

8.4 to 8.7 ft. SANDY LEAN CLAY s(CL):

Approximately 60% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 40% fine to coarse sand, predominantly fine, hard, subangular to subrounded;

maximum size coarse sand; moist; brown; hard;

strong HCl reaction; contained microcrystalline gypsum.

8.7 to 8.8 ft. SILTY SAND SM: Approximately 80% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 20% nonplastic fines; maximum size coarse sand; moist;

brown; weak cementation; strong HCl reaction.

8.8 to 13.3 ft. SANDY LEAN CLAY s(CL):

Approximately 60% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 40% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; hard; strong HCl reaction; contained microcrystalline gypsum.

Lab Test Data: 9.4 to 10.9 ft. 91.0% fines, 9.0% sand, LL=33.8, PI=19.2, MC=7.2%, Lab Classification = Lean Clay CL.

s(CL)

SP-SC

(CL)s

LOCATION:

CO-96, 0.9 miles east of Nyberg Road, Avondale, CO.

PURPOSE OF HOLE:

To collect geotechnical data for the proposed Arkansas Valley Conduit (AVC) chemical injection site.

DRILLED BY:

USBR - MB Drill Crew (MB-2300) Ryan Dedeker - Driller Pete Shawver- Helper Cody Kelly - Helper Ransom Yates - Helper

DRILLING EQUIPMENT:

Truck Mounted CME-85 drill (yellow).

4.25-inch ID, 9.0-inch OD Heavy Duty Hollow Stem Augers (HSA).

4-inch OD split spoon core barrel with 2.63-inch ID, 4-inch OD core barrel shoe and metal catcher, mounted on hexagonal rods via 4-inch OD bearing head.

CME automatic hammer with 2-feet-long, 1.5-inch ID, 2-inch OD SPT barrel with 1.375-inch ID SPT shoe and plastic catcher on NWJ rods.

CME automatic hammer with 1-foot-long, 2-inch ID, 2.5-inch OD California Sampler with 2-inch OD by 4-inch long brass liners and 1.94-inch ID shoe on NWJ rods.

DRILLING METHODS:

0.0 to 4.4 ft. - HSA with 4.4-feet continuous sample. Performed SPT at interval listed below.

4.4 to 30.9 ft. - HSA with 2.5-feet continuous samples. Performed SPT or California Sampler test at intervals listed below.

Coordinate System:

Colorado State Plane South (0503) US Survey Feet, NAD83

Continued next pageCOMMENTS:

All depths are feet below ground surface (bgs).

ID = inside diameter OD = outside diameter

ft. = feet depth HSA = Hollow Stem Auger SPT = Standard Penetration Test

CLASSIFICATION AND

NOTES

SHEET 1 OF 3

GROUND ELEVATION: 4550.1COORDINATES: N 1,584,765.1 E 3,320,444.7

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-3

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/7/23 FINISHED: 2/7/23 TOTAL DEPTH: 30.9

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

D H

P J

L O

G _2

Qal

13.3 to 13.4 ft. CLAYEY SAND SC: Approximately 65% fine to coarse sand, predominantly fine, hard, subangular to subrounded; approximately 35% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size coarse sand; moist; light brown; weak cementation;

strong HCl reaction.

13.4 to 13.6 ft. LEAN CLAY CL: Approximately 90% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 10% fine to medium sand, predominantly fine, subangular to subrounded; maximum size medium sand; moist; brown; hard; strong HCl reaction;

contained microcrystalline gypsum.

13.6 to 15.6 ft. POORLY GRADED SAND WITH CLAY SP-SC: Approximately 90% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 10% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; trace fine gravel, hard, subangular to subrounded; maximum size 3/8-inch;

moist; tan; weak cementation; strong HCl reaction;

contained calcium carbonate precipitation.

15.6 to 18.4 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 85% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 15% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; hard; strong HCl reaction.

18.4 to 20.3 ft. LEAN CLAY CL: Approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine sand, subangular to subrounded; maximum size fine sand; moist; brown; hard; strong HCl reaction;

contained microcrystalline gypsum.

20.3 to 24.4 ft. STRATIFIED: Stratified, nonplanar sand and clay lenses. POORLY GRADED SAND WITH CLAY SP-SC: approximately 90% fine to medium sand, predominantly fine, subangular to subrounded; approximately 10% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size medium sand;

moist; tan; weak cementation; strong HCl reaction;

contained iron oxide staining. SANDY LEAN CLAY s(CL): approximately 70% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 30% fine to medium sand, predominantly fine, subangular to subrounded; maximum size medium sand; moist;

brown; 20.3 to 21.9 ft. hard, 21.9 to 24.4 ft. firm;

strong HCl reaction; contained iron oxide staining.

BOTTOM OF HOLE

SP-SC/s(CL)

SM/(CL)s s(CL)

(CL)s/SP-SM

SPT & CALIFORNIA SAMPLER

INTERVALS AND RECOVERY:

4.4 to 5.9 ft. SPT No.1: 100%

6.9 to 8.4 ft. California No.1: 87%

9.4 to 10.9 ft. SPT No.2: 100%

11.9 to 13.4 ft. California No.2: 70%

14.4 to 15.9 ft. SPT No.3: 100%

16.9 to 18.4 ft. California No.3: 67%

19.4 to 20.9 ft. SPT No.4: 67%

21.9 to 23.4 ft. SPT No.5: 70%

24.4 to 25.9 ft. SPT No.6: 67%

26.9 to 28.4 ft. SPT No.7: 73%

29.4 to 30.9 ft. SPT No.8: 87%

SPT & CALIFORNIA SAMPLER

INTERVALS WITH BARREL SINK

PRIOR TO TESTING:

None.

SPT SAMPLES SUBMITTED TO

LAB:

9.4 to 10.9 ft. SPT No.2

26.9 to 28.4 ft. SPT No.7

DRILLING FLUID:

No water added.

HOLE COMPLETION:

30.9 to 0.0 ft. - Backfilled hole with 3/8-inch bentonite chips.

15 bags 50lb 3/8-inch bentonite chips.

DRILLING CONDITIONS &

COMMENTS:

None.

WATER LEVELS:

Not encountered.

CLASSIFICATION AND

NOTES

SHEET 2 OF 3

GROUND ELEVATION: 4550.1COORDINATES: N 1,584,765.1 E 3,320,444.7

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-3

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/7/23 FINISHED: 2/7/23 TOTAL DEPTH: 30.9

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

D H

P J

L O

G _2

24.4 to 26.3 ft. STRATIFIED: Stratified layers of sand and clay, 0.2 to 0.4 ft. thick. SILTY SAND SM:

approximately 70% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 30% fines with low dry strength, slow dilatancy, low plasticity, and low toughness; trace fine gravel, hard, subangular to subrounded; maximum size 1/2-inch; moist; tan;

weak cementation; strong HCl reaction; contained iron oxide staining. LEAN CLAY WITH SAND (CL)s: approximately 80% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 20% fine to medium sand, predominantly fine, subangular to subrounded; maximum size medium sand; moist;

brown; firm; strong HCl reaction.

26.3 to 27.2 ft. SANDY LEAN CLAY s(CL):

Approximately 55% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 45% fine to coarse sand, predominantly fine, hard, subangular to subrounded;

trace fine gravel, hard, subangular to subrounded;

maximum size 3/4-inch; moist; brown; firm; weak HCl reaction; contained iron oxide staining.

27.2 to 28.6 ft. STRATIFIED: Stratified, nonplanar clay with lenses of sand up to 1/2-inch. LEAN CLAY WITH SAND (CL)s: approximately 80% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 20% fine sand, subangular to subrounded;

maximum size fine sand; moist; brown; firm; weak HCl reaction; contained iron oxide staining.

POORLY GRADED SAND WITH SILT SP-SM:

approximately 90% fine to medium sand, subangular to subrounded; approximately 10% nonplastic fines;

maximum size medium sand; moist; tan; weak cementation; weak HCl reaction; contained iron oxide staining.

Lab Test Data: 26.9 to 28.4 ft. 41.0% fines, 59.0% sand, nonplastic, MC=11.4%, Lab Classification = Silty Sand SM.

28.6 to 30.9 ft. POORLY GRADED SAND SP:

Approximately 90% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 5% nonplastic fines;

approximately 5% fine gravel, hard, subangular to subrounded; maximum size 3/4-inch; moist; buff;

weak cementation; weak HCl reaction.

CLASSIFICATION AND

NOTES

SHEET 3 OF 3

GROUND ELEVATION: 4550.1COORDINATES: N 1,584,765.1 E 3,320,444.7

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-3

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/7/23 FINISHED: 2/7/23 TOTAL DEPTH: 30.9

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

D H

P J

L O

G _2

Qal

0.0 to 30.7 ft.

QUATERNARY ALLUVIUM (Qal):

0.0 to 6.8 ft. LEAN CLAY CL: 0.0 to 0.8 ft. topsoil;

approximately 95% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; 0.0 to 4.8 ft. hard, 4.8 to 6.8 ft. firm; strong HCl reaction; contained microcrystalline gypsum.

6.8 to 8.6 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 75% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 25% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; firm; strong HCl reaction.

8.6 to 8.7 ft. POORLY GRADED SAND WITH CLAY SP-SC: Approximately 90% fine to medium sand, predominantly medium, subangular to subrounded;

approximately 10% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size medium sand; moist;

brown; weak cementation; strong HCl reaction.

8.7 to 9.1 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 75% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 25% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; hard; strong HCl reaction.

9.1 to 9.2 ft. CLAYEY SAND SC: Approximately 70% fine to medium sand, predominantly fine, subangular to subrounded; approximately 30% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size medium sand; moist; brown; weak cementation;

strong HCl reaction.

(CL)s

SP-SC

(CL)s

LOCATION:

CO-96, 0.9 miles east of Nyberg Road, Avondale, CO.

PURPOSE OF HOLE:

To collect geotechnical data for the proposed Arkansas Valley Conduit (AVC) chemical injection site.

DRILLED BY:

USBR - MB Drill Crew (MB-2300) Ryan Dedeker - Driller Pete Shawver- Helper Cody Kelly - Helper Ransom Yates - Helper

DRILLING EQUIPMENT:

Truck Mounted CME-85 drill (yellow).

4.25-inch ID, 9.0-inch OD Heavy Duty Hollow Stem Augers (HSA).

4-inch OD split spoon core barrel with 2.63-inch ID, 4-inch OD core barrel shoe and metal catcher, mounted on hexagonal rods via 4-inch OD bearing head.

CME automatic hammer with 2-feet-long, 1.5-inch ID, 2-inch OD SPT barrel with 1.375-inch ID SPT shoe and plastic catcher on NWJ rods.

CME automatic hammer with 1-foot-long, 2-inch ID, 2.5-inch OD California Sampler with 2-inch OD by 4-inch long brass liners and 1.94-inch ID shoe on NWJ rods.

DRILLING METHODS:

0.0 to 4.2 ft. - HSA with 4.2-feet continuous sample. Performed SPT at interval listed below.

4.2 to 30.7 ft. - HSA with 2.5-feet continuous samples. Performed SPT or California Sampler test at intervals listed below.

Coordinate System:

Colorado State Plane South (0503) US Survey Feet, NAD83

Continued next pageCOMMENTS:

All depths are feet below ground surface (bgs).

ID = inside diameter OD = outside diameter

ft. = feet depth HSA = Hollow Stem Auger SPT = Standard Penetration Test

CLASSIFICATION AND

NOTES

SHEET 1 OF 4

GROUND ELEVATION: 4548.8COORDINATES: N 1,584,710.1 E 3,320,350.1

STATE: Colorado

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: NA

O R

E R

E C

O V

E R

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

S /L

GEOLOGIC LOG OF DRILL HOLE: ISDH-23-4

FEATURE: Arkansas Valley Conduit - Injection Site

DEPTH TO BEDROCK: not encountered

LOCATION: CO-96, east of Nyberg Road, Avondale, CO

BEGUN: 2/7/23 FINISHED: 2/8/23 TOTAL DEPTH: 30.7

HOLE LOGGED BY: E. Hammers, K. Wetzel REVIEWED BY: C. Clark

A V

D H

P J

L O

G _2

Qal

9.2 to 11.6 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 80% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 20% fine sand, subangular to subrounded; maximum size fine sand; moist;

brown; hard; strong HCl reaction.

Lab Test Data: 9.2 to 10.7 ft. 94.0% fines, 6.0% sand, LL=38.5, PI=21.2, MC=8.9%, Lab Classification = Lean Clay CL.

11.6 to 12.0 ft. SILTY SAND SM: Approximately 70% fine to coarse sand, predominantly fine, hard, subangular to subrounded; approximately 30% fines with low dry strength, slow dilatancy, low plasticity, and low toughness; maximum size coarse sand;

moist; brown; weak cementation; strong HCl reaction.

12.0 to 13.0 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 85% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 15% fine to medium sand, subangular to subrounded; maximum size medium sand; moist; brown; hard; strong HCl reaction;

contained iron oxide staining.

13.0 to 13.2 ft. CLAYEY SAND SC: Approximately 75% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 25% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size coarse sand; moist; light brown; weak cementation;

strong HCl reaction.

13.2 to 17.9 ft. LEAN CLAY WITH SAND (CL)s:

contained iron oxide staining from 13.2 to 14.2 ft.

and 16.7 to 17.9 ft.; contained microcrystalline gypsum from 14.2 to 16.7 ft.

17.9 to 20.6 ft. LEAN CLAY CL: Approximately 90% fines with medium dry strength, no dilatancy, medium plasticity, and…

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