DRAFT_Geology-Drawings-B_AVC-CrowleyReach1_1.pdf

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GEOLOGY

GEOLOGIC EXPLANATION

BILLINGS, MT

382-600-60047

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL

£TT£

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GEOLOGY

Crites, Cortney C

Singleton, Jeremy V

Roccoforte, Kim M

GEOLOGIC UNITS

(Fill) - Consists of variable mixtures of fines, sand, gravel. Fill was encountered during geologic mapping in the roadways in the town of Boone. Fill was encountered in DH-24-201 and DH-24-216 where it ranged from Silt (ML) to Clayey Sand with Gravel, (SC)g with a range of approximately 30 to 40% sand, 0 to 30% gravels and 30 to 70% fines.

Quaternary Slopewash (Qsw) - Heterogeneous mix of clay, silt, sand, gravel, and igneous and metamorphic cobbles. This unit typically mantles Qat and Kp, and is located on hillslopes, thickest at the base of slopes. Visual USCS classifications include Clayey Sand with Gravel and Cobbles (SC)gc, Clayey Sand (SC), Silty Sand (SM), Lean Clay with Sand (CL)s, and Sandy Lean Clay, s(CL). The reaction with HCl ranges from weak to strong. Soil contains occasional stringers of microcrystalline gypsum. Thickness encountered during this investigation ranges from 1.7 to 8.2 feet.

Quaternary Alluvial Terrace (Qat) - Pleistocene-age alluvium that consists primarily of silt, sand, clay, gravel, and igneous and metamorphic cobbles. Qat is cross bedded and locally well cemented with calcium carbonate. Qat unconformably overlies the Pierre Shale (Kp) at the top and upper slope of local hills. Qat was not encountered while drilling during investigations but was identified on surface maps.

Geologic contacts were established through Feild investigations, and interpretation of the Geologic Map of Pueblo 1X2 degree Quadrangle, South Central Colorado (Scott et al., 1978)

Cretaceous Pierre Shale (Kp) - Dark gray, very intensely weathered to fresh shale. The shale is divided into an upper weathered zone and lower unweathered zone. The upper weathered zone ranges from 2.3 to 19.7 feet thick and is moderately weathered (W4) to very intensely weathered (W8). The lower unweathered zone is fresh (W1) to slightly weathered (W3). The contact between the weathering zones ranges from distinct to gradual over several feet. The Kp shale air slakes rapidly and has a durability index of DI3. The upper weathered zone rapidly decomposes to clay when exposed to water. Kp shale is fissile, laminated to thinly bedded, and the drill core separates readily along bedding planes. The shale contains veins of gypsum, typically has no reaction with HCl, contains a trace of marine fossils, and locally concretions up to 8 inches diameter. Kp outcrops are exposed throughout the area leading up to the Regulating Tanks site. The formation dips less than 5 degrees to the north. Qat and Qsw uncomformably overlie the shale. The Kp overlies the Cretaceous Niobrara Formation Smoky Hill Shale Member (Kns), but it was not encountered during this investigation.

See geologic logs for complete descriptions of geologic materials, drilling methods,and hole completions.

Descriptive terms appearing on the geologic drawings describe the soil according to the Visual Unified Soil Classification System (USCS) and the bedrock according to Volume 1 of the Engineering Geology Field Manual (USBR, 1998).

Geologic sections do not depict all local irregularities across the exploration site. The weathering profile is inferred between drill holes.

LEGEND

Depth in feet

Total depth in feet

Geological contact solid where defined, dashed where approximate and queried where inferred

BEDROCK GEOLOGY

Existing ground

SURFICIAL GEOLOGY

Kp,Cretaceous Pierre Shale weathering profile

Kp, Cretaceous Pierre Shale upper weathered zone

W4 moderately to slightly weathered W5 moderately weathered W6 intensely to moderately weathered W7 intensely weathered W8 very intensely weathered

Kp, Cretaceous Pierre Shale lower unweathered zone

W1 fresh W2 slightly weathered to fresh W3 slightly weathered

Drill hole/Test pit number Distance in feet and direction projected to plane of section Ground surface elevation

Stick log indicating location of exploration hole:

Stick log dashed where projected

Unified Soil Classification System symbol

PLAN 382-600-60046

SECTION A-A' 382-600-60048

SECTION B-B' AND B'-B'' 382-600-60049

SECTION C-C' 382-600-60050

SECTION D-D' AND D'-D'' 382-600-60051

REFERENCE DRAWINGS

GEOLOGIC NOTES

Kp Kp

Qsw, Quartermary Slopewash

Qat Quartermary Alluvial Terrace

Qsw

Qat Fill Fill

USBR field data.

USGS National Map: 3DEP Elevation Program, National Hydrography Dataset, and National Transportation Dataset. Data refreshed June, 2024

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

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Legend AVC Boone Reach

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Contours - US Feet Artificial Fill (af)

Quaternary

Alluvium (Qal) Alluvial Terrace (Qat)

Cretaceous

Pierre Shale (Kp) - Shale Pierre Shale (Kp) - Diagenesis and Concretions ••

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State Hwy 96

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

North American Datum 1983 (2011) Scale = 1:5,000 1 inch = 416.67 feet

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Legend AVC Boone Reach

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Contours - US Feet Artificial Fill (af)

Quaternary Alluvium (Qal) ••

Co Rd

State Hwy 96

Garcia Rd

Garcia Rd

DH-22-118

TP-22-106

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

North American Datum 1983 (2011) Scale = 1:5,000 1 inch = 416.67 feet

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Legend AVC Boone Reach

40 ft Drill Hole Test Pit

Contours - US Feet Artificial Fill (af)

Quaternary

Garcia Rd

State Hwy 96

State Hwy 96

DH-22-119

DH-21-3

DH-22-120

DH-22-121

DH-22-122ADH-22-122

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

North American Datum 1983 (2011) Scale = 1:5,000 1 inch = 416.67 feet

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FRYINGPAN-ARKANSAS PROJECT, ARKANSAS VALLEY CONDUIT

Boone Reach - Surface Geology

USBR - MB GIS & MB GEOLOGY

North American Datum 1983 (2011) Scale = 1:5,000 1 inch = 416.67 feet

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Legend AVC Boone Reach

22 ft Drill Hole 40 ft Drill Hole

Contours - US Feet Artificial Fill (af)

Quaternary

G11DRAFT

af

Qal

Kp

0.0 to 2.2 ft.

ARTIFICIAL FILL (af):

0.0 to 0.2 ft. CLAYEY SAND SC: Topsoil;

approximately 60% fine to coarse sand, hard, subangular to subrounded; approximately 40% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; trace fine gravel, hard, subangular to subrounded; maximum size 1/2-inch; moist; brown; moderate cementation;

strong HCl reaction; contains vegetation.

0.2 to 2.2 ft. CLAYEY SAND SC: Fill; approximately 50% fine to coarse sand, hard, subangular to subrounded; approximately 40% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

maximum size 2.5-inches; moist; brown; strong cementation; strong HCl reaction.

2.2 to 14.9 ft.

QUATERNARY ALLUVIUM (Qal):

2.2 to 4.9 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, predominantly fine, subangular to subrounded;

maximum size medium sand; moist; light brown; very hard; strong HCl reaction; contains microcrystalline gypsum.

4.9 to 6.1 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; contains micas.

SC

s(CL)

SC

(SC)g

SC

CL

SC

CL

SC

(CL)s

SC

shale

LOCATION:

CO-209 & 1st St, southeast of intersection, Boone, CO.

PURPOSE OF HOLE:

To collect geotechnical data for proposed Arkansas Valley Conduit (AVC) alignment.

DRILLED BY:

USBR - MB Drill Crew (MB-2300) Cody Kelly - Driller Pete Shawver - Helper Ryan Dedeker - 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 1.93-inch ID shoe on NWJ rods.

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

DRILLING METHODS:

0.0 to 3.4 ft. - HSA with 3.4-feet continuous sample. Performed SPT at interval listed below.

3.4 to 18.4 ft. - HSA with 2.5-feet continuous samples. Performed SPT or California Sampler test at intervals listed below.

18.4 to 20.4 ft. - HSA with 2.0-feet continuous sample.

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 5

GROUND ELEVATION: 4461.4COORDINATES: N 1,577,927.7 E 3,356,214.9

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: N/A

C

O R

E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

F

LD

C

LA

S

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IT

H

GEOLOGIC LOG OF DRILL HOLE: DH-22-114

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 14.9

LOCATION: CO-209 & 1st St, southeast side, Boone, CO

BEGUN: 8/20/22 FINISHED: 8/20/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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Kp

6.1 to 6.2 ft. CLAYEY SAND WITH GRAVEL (SC)g:

Approximately 50% fine to coarse sand, predominantly fine, hard, subangular to subrounded;

approximately 35% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 15% fine gravel, hard, subangular to subrounded; maximum size 3/4-inch;

moist; light brown; moderate cementation; strong HCl reaction; contains micas.

6.2 to 6.9 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; contains micas.

Lab Test Data: Sample No. 00400-S01 6.55 to 6.90

ft. 55.9% fines, 44.1% sand, LL=24, PI=10, MC=5.8%, Dry Unit Weight (pcf)=105.9, Degree of Saturation=25.9%, Void Ratio=0.628, Length to Diameter Ratio=2.1, Unconfined Compressive Strength (psf)=7300, Undrained Shear Strength (psf)=3650, Lab Classification = Sandy Lean Clay s(CL).

Lab Test Data: 6.55 to 6.90 ft. 66.0% fines, 44.0% sand, LL=23.6, PI=10.0, MC=4.1%, Lab Classification = Sandy Lean Clay s(CL).

6.9 to 9.0 ft. CLAYEY SAND SC: Approximately 75% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 20% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 5% fine gravel, hard, subangular to subrounded;

maximum size 3/4-inch; moist; light brown; moderate cementation; strong HCl reaction; contains micas.

Lab Test Data: Sample No. 00400-S02 6.90 to 7.25

ft. 50.0% fines, 50.0% sand, LL=20, PI=7, MC=12.7%, Dry Unit Weight (pcf)=125.6, Degree of Saturation=94.6%, Initial Void Ratio=0.405, Collapse=0.9%, Lab Classification = Sandy Silty Clay s(CL-ML).

Lab Test Data: 8.4 to 9.9 ft. 70.0% fines, 30.0% sand, LL=34.1, PI=17.0, MC=14.2%, Lab Classification = Sandy Lean Clay s(CL).

9.0 to 12.1 ft. CLAYEY SAND SC: Approximately 70% fine to coarse sand, predominantly fine, 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 with red, gray, and black mottling; moderate cementation; strong HCl reaction; contains micas and iron oxide staining.

BOTTOM OF HOLE

shale

20.4 to 20.8 ft. - HSA into bedrock without continuous sample.

20.4 to 40.0 ft. - HQ3 rock coring.

SPT & CALIFORNIA SAMPLER

INTERVALS AND RECOVERY:

3.4 to 4.9 ft. SPT No.1: 93%

5.9 to 7.4 ft. California No.1: 87%

8.4 to 9.9 ft. SPT No.2: 83%

10.9 to 12.4 ft. California No.2: 90%

13.4 to 14.9 ft. SPT No.3: 100%

15.9 to 17.4 ft. California No.3: 90%

SPT & CALIFORNIA SAMPLER

INTERVALS WITH BARREL SINK

PRIOR TO TESTING:

13.4 to 14.9 ft. SPT No.3: sank 0.1 ft.

SPT SAMPLES SUBMITTED TO

LAB:

8.4 to 9.9 ft. SPT No.2

DRILLING FLUID:

No water added during HSA drilling.

HOLE COMPLETION:

No observation well installed due to not encountering groundwater.

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

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

DRILLING CONDITIONS &

COMMENTS:

None.

WATER LEVELS:

Not encountered.

CLASSIFICATION AND

NOTES

SHEET 2 OF 5

GROUND ELEVATION: 4461.4COORDINATES: N 1,577,927.7 E 3,356,214.9

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: N/A

C

O R

E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

F

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IT

H

GEOLOGIC LOG OF DRILL HOLE: DH-22-114

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 14.9

LOCATION: CO-209 & 1st St, southeast side, Boone, CO

BEGUN: 8/20/22 FINISHED: 8/20/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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G13

Lab Test Data: Sample No. 00400-S03 11.55 to

11.90 ft. 75.3% fines, 24.7% sand, LL=30, PI=13, MC=17.9%, Dry Unit Weight (pcf)=110.8, Degree of Saturation=89.2%, Void Ratio=0.557, Length to Diameter Ratio=2.0, Unconfined Compressive Strength (psf)=2160, Undrained Shear Strength (psf)=1080, Lab Classification = Lean Clay with Sand (CL)s.

Lab Test Data: 11.55 to 11.90 ft. 72.0% fines, 28.0% sand, LL=30.0, PI=12.7, MC=15.8%, Lab Classification = Lean Clay with Sand (CL)s.

Lab Test Data: Sample No. 00400-S04 11.90 to

12.25 ft. 90.0% fines, 10.0% sand, LL=31, PI=17, MC=17.9%, Dry Unit Weight (pcf)=113.0, Degree of Saturation=94.5%, Initial Void Ratio=0.532, Collapse=<0.1%, Lab Classification = Lean Clay CL.

12.1 to 12.6 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; light brown with red, gray, and black mottling; firm; strong HCl reaction.

12.6 to 12.7 ft. CLAYEY SAND SC: Approximately 80% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 20% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size coarse sand; moist; light brown with red, gray, and black mottling; moderate cementation; strong HCl reaction.

12.7 to 12.9 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; light brown with red, gray, and black mottling; firm; strong HCl reaction.

12.9 to 13.1 ft. CLAYEY SAND SC: Approximately 80% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 20% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size coarse sand; moist; light brown with red, gray, and black mottling; moderate cementation; strong HCl reaction.

CLASSIFICATION AND

NOTES

SHEET 3 OF 5

GROUND ELEVATION: 4461.4COORDINATES: N 1,577,927.7 E 3,356,214.9

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: N/A

C

O R

E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

F

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LA

S

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IT

H

GEOLOGIC LOG OF DRILL HOLE: DH-22-114

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 14.9

LOCATION: CO-209 & 1st St, southeast side, Boone, CO

BEGUN: 8/20/22 FINISHED: 8/20/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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G14

13.1 to 14.0 ft. LEAN CLAY WITH SAND (CL)s:

Approximately 80% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 20% fine to coarse sand, predominantly fine, hard, subangular to subrounded;

trace fine to coarse gravel, hard, subangular to subrounded; maximum size 2-inches; moist; light brown with red, gray, and black mottling; firm; strong HCl reaction.

14.0 to 14.9 ft. CLAYEY SAND SC: Approximately 45% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 45% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 10% fine to coarse gravel, hard, subangular to subrounded; maximum size 1.5-inches; moist; light brown with red, gray, and black mottling; moderate cementation; strong HCl reaction.

14.9 to 40.0 ft.

CRETACEOUS PIERRE SHALE (Kp):

14.9 to 40.0 ft. SHALE: 14.9 to 22.65 ft. moist,

22.65 to 40.0 ft. dry; gray to dark gray, weathers to brown; 14.9 to 15.4 ft. very intensely weathered (W8), 15.4 to 18.6 ft. moderately weathered (W5),

18.6 to 22.65 ft. moderately to slightly weathered (W4), 22.65 to 29.0 ft. slightly weathered (W3), 29.0

29.8 ft. slightly weathered to fresh (W2), 29.8 to 40.0

ft. fresh (W1); 14.9 to 18.6 ft. very soft (H7), 18.6 to

29.0 ft. soft (H6), 29.0 to 29.8 ft. moderately soft (H5), 29.8 to 40.0 ft. moderately hard (H4); core recovery very slightly fractured (FD1) to very intensely fractured (FD9); 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; strong HCl reaction on disaggregated grains; contains occasional baculite and bivalve fossils.

Descriptive summary:

17.8 to 18.4 ft. - Microcrystalline gypsum

20.83 ft. - 47° fracture, O0, T0, W2

20.89 ft. - 78° fracture, O0, T0, W2

21.0 ft. - 63° fracture, O1, T1, W2

21.43 ft. - 90° mechanical break

21.43 to 21.46 ft. - 28° incipient fracture, O1, T1 (CaCO3), W2

21.43 to 21.87 ft. - 22° fracture, O1, T1 (CaCO3), W2

22.3 ft. - 90° mechanical break

23.68 ft. - 90° mechanical break

23.83 ft. - 90° mechanical break

24.23 ft. - 62° fracture, O0, T0, W2

24.52 ft. - 90° mechanical break

24.93 ft. - 90° mechanical break

25.09 ft. - 40° fracture, O0,T0, W2

25.32 ft. - 47° fracture, O0, T0, W2

CLASSIFICATION AND

NOTES

SHEET 4 OF 5

GROUND ELEVATION: 4461.4COORDINATES: N 1,577,927.7 E 3,356,214.9

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: N/A

C

O R

E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

F

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LA

S

S /L

IT

H

GEOLOGIC LOG OF DRILL HOLE: DH-22-114

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 14.9

LOCATION: CO-209 & 1st St, southeast side, Boone, CO

BEGUN: 8/20/22 FINISHED: 8/20/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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G15

25.99 to 26.06 ft. - 90° mechanical break

25.99 to 27.03 ft. - 9° fracture, O0, T1, W2

26.21 ft. - 90° mechanical break

26.88 to 27.37 ft. - 5° incipient fracture, O0, T1, W2

34.41 ft. - 90° mechanical break

39.68 ft. - 90° mechanical break

39.89 ft. - 90° mechanical break

Lab Test Data: Sample No. 00400-S07 29.30 to

29.80 ft. MC=10.8%, Dry Unit Weight (pcf)=131.5, Length to Diameter Ratio=2.1, Unconfined Compressive Strength (psf)=50800, Undrained Shear Strength (psf)=25400, Lab Classification = Unclassified, no physical properties test.

CLASSIFICATION AND

NOTES

SHEET 5 OF 5

GROUND ELEVATION: 4461.4COORDINATES: N 1,577,927.7 E 3,356,214.9

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: N/A

C

O R

E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

F

LD

C

LA

S

S /L

IT

H

GEOLOGIC LOG OF DRILL HOLE: DH-22-114

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 14.9

LOCATION: CO-209 & 1st St, southeast side, Boone, CO

BEGUN: 8/20/22 FINISHED: 8/20/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

LO

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G16 af

Qal

Kp

0.0 to 0.7 ft.

ARTIFICIAL FILL (af):

0.0 to 0.7 ft. CLAYEY SAND WITH GRAVEL (SC)g:

Roadbase; Approximately 55% fine to coarse sand, hard, subangular to subrounded; approximately 25% fine to coarse gravel, hard, subangular to subrounded; approximately 20% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size 2.5-inches; dry;

light brown; weak cementation; strong HCl reaction.

0.7 to 1.7 ft.

QUATERNARY ALLUVIUM (Qal):

0.7 to 1.7 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; contains microcrystalline gypsum.

1.7 to 22.0 ft.

CRETACEOUS PIERRE SHALE (Kp):

1.7 to 22.0 ft. SHALE: 1.7 to 13.6 ft. moist, 13.6 to

13.8 ft. wet, 13.8 to 15.65 ft. moist, 15.65 to 22.0 ft.

dry; gray to dark gray, weathers to brown; 1.7 to 5.5

ft. very intensely weathered (W8), 5.5 to 12.5 ft.

moderately weathered (W5), 12.5 to 13.6 ft. slightly weathered (W3), 13.6 to 15.65 ft. intensely weathered (W5), 15.65 to 22.0 ft. fresh (W1); 1.7 to

5.5 ft. very soft (H7), 5.5 to 6.2 ft. moderately soft (H5), 6.2 to 12.5 ft. soft (H6), 12.5 to 13.6 ft.

moderately hard (H4), 13.6 to 15.65 ft. soft (H6),

15.65 to 22.0 ft. moderately hard (H4); fracture characteristics undiscernible due to drilling methods;

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;

strong HCl reaction on disaggregated grains;

contains occasional baculite and bivalve fossils.

(SC)g

CL

shale

LOCATION:

1st St & Russell Ave, southeast of intersection, Boone, CO.

PURPOSE OF HOLE:

To collect geotechnical data for proposed Arkansas Valley Conduit (AVC) alignment and install an observation well.

DRILLED BY:

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

DRILLING METHODS:

0.0 to 3.5 ft. - HSA with 3.5-feet continuous sample. Performed SPT at interval listed below.

3.5 to 18.5 ft. - HSA with 2.5-feet continuous samples.

18.5 to 22.0 ft. - HSA with 3.5-feet continuous sample.

SPT & CALIFORNIA SAMPLER

INTERVALS AND RECOVERY:

3.5 to 5.0 ft. SPT No.1: 90%

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 2

GROUND ELEVATION: 4463.3COORDINATES: N 1,577,835.1 E 3,357,271.6

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: 13.6 (4476.90) 7/24/2022

C

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E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

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GEOLOGIC LOG OF DRILL HOLE: DH-22-115

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 1.7

LOCATION: 1st St & Russell Ave, southeast side, Boone, CO

BEGUN: 7/24/22 FINISHED: 7/24/22 TOTAL DEPTH: 22.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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Kp

Descriptive summary:

10.7 to 12.5 ft. - Strong gasoline odor

13.8 to 14.2 ft. - Shale disaggregated

15.8 to 15.95 ft. - 14° conchoidal fracture, O0, T1 (iron oxide), W6

BOTTOM OF HOLE

shale

SPT & CALIFORNIA SAMPLER

INTERVALS WITH BARREL SINK

PRIOR TO TESTING:

None.

SPT SAMPLES SUBMITTED TO

LAB:

3.5 to 5.0 ft. SPT No.1

DRILLING FLUID:

No water added during HSA drilling.

HOLE COMPLETION:

No observation well installed due to not encountering significant groundwater and location prone to flush mount damage during maintenance of gravel city street.

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

2.0 to 0.0 ft. - Backfilled hole with cuttings and roadbase.

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

DRILLING CONDITIONS &

COMMENTS:

15.5 to 22.0 ft. - Slow drilling in hard shale.

WATER LEVELS:

7/24/2022 - 13.6 to 13.8 ft. bgs during drilling.

CLASSIFICATION AND

NOTES

SHEET 2 OF 2

GROUND ELEVATION: 4463.3COORDINATES: N 1,577,835.1 E 3,357,271.6

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: 13.6 (4476.90) 7/24/2022

C

O R

E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

F

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H

GEOLOGIC LOG OF DRILL HOLE: DH-22-115

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 1.7

LOCATION: 1st St & Russell Ave, southeast side, Boone, CO

BEGUN: 7/24/22 FINISHED: 7/24/22 TOTAL DEPTH: 22.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

LO

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G18 af

Qal

0.0 to 3.7 ft.

ARTIFICIAL FILL (af):

0.0 to 0.5 ft. CLAYEY SAND SC: Fill; approximately 80% fine to medium sand, predominantly fine, subangular to subrounded; approximately 20% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size medium sand; moist; brown; moderate cementation;

strong HCl reaction.

0.5 to 3.7 ft. CLAYEY SAND WITH GRAVEL (SC)g:

Fill; approximately 60% fine to coarse sand, hard, subangular to subrounded; approximately 20% fine to coarse gravel, hard, subangular to subrounded;

approximately 20% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size 3-inches; moist; light brown; weak cementation; strong HCl reaction.

3.7 to 31.8 ft.

QUATERNARY ALLUVIUM (Qal):

3.7 to 4.1 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; light brown; moderate cementation; strong HCl reaction.

4.1 to 6.2 ft. SILTY SAND SM: Approximately 80% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 15% nonplastic fines; approximately 5% fine gravel, hard, subangular to subrounded; maximum size 3/4-inch;

moist; tan; weak cementation; strong HCl reaction;

contains multiple discontinuous lenses to 3/4-inch-thick of Sandy Lean Clay s(CL).

SC

(SC)g

SC

SM

s(CL)

SM

(CL)s

SM

SC

(CL)s

SC

(SP-SM)g

LOCATION:

CO-96, 500 ft west of Boone Rd, south ROW, Boone, CO.

PURPOSE OF HOLE:

To collect geotechnical data for proposed Arkansas Valley Conduit (AVC) alignment and install an observation well.

DRILLED BY:

USBR - MB Drill Crew (MB-2300) Cody Kelly - Driller Pete Shawver - Helper Ryan Dedeker - 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 1.93-inch ID shoe on NWJ rods.

DRILLING METHODS:

0.0 to 3.7 ft. - HSA with 3.7-feet continuous sample. Performed SPT at interval listed below.

3.7 to 33.7 ft. - HSA with 2.5-feet continuous samples. Performed SPT or California Sampler test at intervals listed below.

33.7 to 36.2 ft. - HSA with 2.5-feet continuous sample.

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: 4462.8COORDINATES: N 1,577,719.5 E 3,361,559.5

STATE: Colorado

D E

P T

H

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

IT

S

Y M

S P

T

B

LO

W S

/F T

LEVEL AND DATE MEASURED: 20.0 (4482.76) 11/2/2022

C

O R

E R

E C

O V

E R

Y

PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

F

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GEOLOGIC LOG OF DRILL HOLE: DH-22-118

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 31.8

LOCATION: CO-96, 500 ft west of Boone Rd, Boone, CO

BEGUN: 8/17/22 FINISHED: 8/18/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

LO

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G19

Qal

Kp

6.2 to 6.8 ft. 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; hard;

strong HCl reaction.

6.8 to 7.2 ft. SILTY SAND SM: Approximately 75% fine to coarse sand, predominantly fine, hard, subangular to subrounded; approximately 25% nonplastic fines; maximum size coarse sand; moist;

tan; weak cementation; strong HCl reaction.

7.2 to 7.8 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, predominantly fine, subangular to subrounded;

maximum size medium sand; moist; gray-brown;

hard; strong HCl reaction; contains microcrystalline gypsum and lenses to 1/4-inch of sandy soil.

7.8 to 8.0 ft. LEAN CLAY WITH SAND (CL)s:

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

maximum size medium sand; moist; dark brown;

firm; strong HCl reaction; contains microcrystalline gypsum.

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

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

maximum size medium sand; moist; gray-brown;

hard; strong HCl reaction; contains microcrystalline gypsum and iron oxide staining.

Lab Test Data: Sample No. 00402-S01 9.00 to 9.35

ft. 70.8% fines, 29.2% sand, LL=36, PI=22, MC=17.4%, Dry Unit Weight (pcf)=102.3, Degree of Saturation=69.8%, Void Ratio=0.684, Length to Diameter Ratio=2.1, Unconfined Compressive Strength (psf)=6940, Undrained Shear Strength (psf)=3470, Lab Classification = Lean Clay with Sand (CL)s.

Lab Test Data: 9.0 to 9.35 ft. 70.0% fines, 30.0% sand, LL=36.4, PI=22.1, MC=11.1%, Lab Classification = Lean Clay with Sand (CL)s.

9.1 to 12.4 ft. SILTY SAND SM: Approximately 70% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 25% nonplastic fines; approximately 5% fine gravel, hard, subangular to subrounded; maximum size 3/4-inch;

moist; tan; weak cementation; strong HCl reaction.

BOTTOM OF HOLE

(SP-SM)g

SP-SM

CH

SP-SM

shale

36.2 to 40.0 ft. - HSA with 3.8-feet continuous sample.

SPT & CALIFORNIA SAMPLER

INTERVALS AND RECOVERY:

3.7 to 5.2 ft. SPT No.1: 100%

6.2 to 7.7 ft. SPT No.2: 87%

8.7 to 10.2 ft. California No.1: 83%

11.2 to 12.7 ft. SPT No.3: 100%

13.7 to 15.2 ft. SPT No.4: 87%

16.2 to 17.7 ft. California No.2: 80%

18.7 to 20.2 ft. SPT No.5: 100%

21.2 to 22.7 ft. SPT No.6: 67%

23.7 to 25.2 ft. SPT No.7: 77%

26.2 to 27.7 ft. SPT No.8: 90%

28.7 to 30.2 ft. SPT No.9: 47%

31.2 to 32.0 ft. SPT No.10: 94%

SPT & CALIFORNIA SAMPLER

INTERVALS WITH BARREL SINK

PRIOR TO TESTING:

18.7 to 20.2 ft. SPT No.5: sank 0.1 ft.

21.2 to 22.7 ft. SPT No.6: sank 0.1 ft.

SPT SAMPLES SUBMITTED TO

LAB:

11.2 to 12.7 ft. SPT No.3

DRILLING FLUID:

No water added during HSA drilling.

HOLE COMPLETION:

Installed observation monitoring well.

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

40.0 to 32.0 ft. - Backfilled hole with 3/8-inch bentonite chips.

32.0 to 25.6 ft. - Backfilled hole with 10/20 silica sand.

25.6 to 25.0 ft. - Installed well sump using blank 2-inch SCH 40 PVC.

25.0 to 20.0 ft. - Installed .010 screen 2-inch SCH 40 PVC.

20.0 to 0.49 ft. - Installed blank 2-inch

SCH 40 PVC.

25.6 to 18.0 ft. - Backfilled hole with 10/20 silica sand for screening.

18.0 to 3.0 ft. - Backfilled hole with 3/8-inch bentonite chips.

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

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

10 bags 50lb 10/20 silica sand.

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

2 bags 60lb concrete.

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

CLASSIFICATION AND

NOTES

SHEET 2 OF 4

GROUND ELEVATION: 4462.8COORDINATES: N 1,577,719.5 E 3,361,559.5

STATE: Colorado

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DEPTH AND ELEV OF WATER

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LEVEL AND DATE MEASURED: 20.0 (4482.76) 11/2/2022

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PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

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GEOLOGIC LOG OF DRILL HOLE: DH-22-118

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 31.8

LOCATION: CO-96, 500 ft west of Boone Rd, Boone, CO

BEGUN: 8/17/22 FINISHED: 8/18/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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G20

Lab Test Data: Sample No. 00402-S02 9.35 to 9.70

ft. 15.0% fines, 85.0% sand, Cu=620.96, Cc=46.80, LL=29, PI=15, MC=17.2%, Dry Unit Weight (pcf)=110.0, Degree of Saturation=83.9%, Initial Void Ratio=0.496, Swell Pressure (psf)=1330, Swell=0.8%, Lab Classification = Clayey Sand SC.

Lab Test Data: 11.2 to 11.7 ft. 11.0% fines, 89.0% sand, nonplastic, Cu=22.0, Cc=4.92, MC=2.1%, Lab Classification = Poorly Graded Sand with Silt

SP-SM.

12.4 to 13.6 ft. CLAYEY SAND SC: Approximately 60% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 30% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; approximately 10% fine gravel, hard, subangular to subrounded;

maximum size 3/4-inch; moist; brown; moderate cementation; variable weak to strong HCl reaction.

13.6 to 17.2 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; contains trace microcrystalline gypsum, trace micas, iron oxide staining, and fine black organics/charcoal.

Lab Test Data: Sample No. 00402-S03 16.85 to

17.20 ft. 88.5% fines, 11.5% sand, LL=35, PI=21, MC=19.1%, Dry Unit Weight (pcf)=109.8, Degree of Saturation=92.6%, Void Ratio=0.569, Length to Diameter Ratio=2.1, Unconfined Compressive Strength (psf)=6780, Undrained Shear Strength (psf)=3390, Lab Classification = Lean Clay CL.

Lab Test Data: 16.85 to 17.20 ft. 89.0% fines, 11.0% sand, LL=35.1, PI=20.6, MC=17.1%, Lab Classification = Lean Clay CL.

17.2 to 19.5 ft. CLAYEY SAND SC: Approximately 75% fine sand, subangular to subrounded;

approximately 25% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; maximum size fine sand; moist; brown;

weak cementation; strong HCl reaction; contains micas, trace CaCO3 nodules/fossils to 3/16-inch-thick, and iron oxide staining.

Lab Test Data: Sample No. 00402-S04 17.20 to

17.55 ft. 85.0% fines, 15.0% sand, LL=28, PI=13, MC=20.1%, Dry Unit Weight (pcf)=108.7, Degree of Saturation=94.8%, Initial Void Ratio=0.597, Swell Pressure (psf)=514, Swell=<0.1%, Lab Classification = Lean Clay with Sand (CL)s.

DRILLING CONDITIONS &

COMMENTS:

26.2 to 31.2 ft.: Rough drilling.

33.7 to 40.0 ft.: Slow drilling in shale.

WATER LEVELS:

8/17/2022 - 20.7 ft. bgs during drilling.

8/23/2022 - 20.6 ft. bgs during well development.

11/2/2022 - 20.0 ft. bgs during random sounding.

CLASSIFICATION AND

NOTES

SHEET 3 OF 4

GROUND ELEVATION: 4462.8COORDINATES: N 1,577,719.5 E 3,361,559.5

STATE: Colorado

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DEPTH AND ELEV OF WATER

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LEVEL AND DATE MEASURED: 20.0 (4482.76) 11/2/2022

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PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

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GEOLOGIC LOG OF DRILL HOLE: DH-22-118

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 31.8

LOCATION: CO-96, 500 ft west of Boone Rd, Boone, CO

BEGUN: 8/17/22 FINISHED: 8/18/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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G21

19.5 to 21.2 ft. POORLY GRADED SAND WITH SILT AND GRAVEL (SP-SM)g: Approximately 70% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 20% fine to coarse gravel, hard, subangular to subrounded;

approximately 10% nonplastic fines; maximum size 1-inch; 19.5 to 20.7 ft. moist, 20.7 to 21.2 ft. wet; light brown; weak cementation; no HCl reaction; contains lenses to 1/2-inch-thick of dark brown Clayey Sand

SC.

21.2 to 25.0 ft. POORLY GRADED SAND WITH SILT SP-SM: Approximately 80% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

approximately 10% nonplastic fines; maximum size 1-inch; wet; light brown; weak cementation; no HCl reaction.

25.0 to 25.2 ft. FAT CLAY CH: Approximately 95% fines with high dry strength, no dilatancy, high plasticity, and high toughness; approximately 5% fine sand, subangular to subrounded; maximum size fine sand; moist; gray-brown; firm; weak HCl reaction;

contains laminated bedding.

25.2 to 31.8 ft. POORLY GRADED SAND WITH SILT SP-SM: Approximately 80% fine to coarse sand, predominantly medium, hard, subangular to subrounded; approximately 10% fine to coarse gravel, hard, subangular to subrounded;

approximately 10% nonplastic fines; maximum size 2.5-inches; wet; light brown; weak cementation; no HCl reaction.

31.8 to 40.0 ft.

CRETACEOUS PIERRE SHALE (Kp):

31.8 to 40.0 ft. SHALE: 31.75 to 38.35 ft. moist,

38.35 to 40.0 ft. dry; gray to dark gray, weathers to brown; 31.75 to 31.8 ft. decomposed (W9), 31.8 to

32.3 ft. intensely to moderately weathered (W6), 32.3 to 33.0 ft. moderately weathered (W5), 33.0 to 37.7

ft. moderately to slightly weathered (W4), 37.7 to

38.35 ft. slightly weathered to fresh (W2), 38.35 to

40.0 ft. fresh (W1); 31.75 to 31.8 ft. very soft (H7),

31.8 to 33.0 ft. soft (H6), 33.0 to 38.35 ft. moderately soft (H5), 38.35 to 40.0 ft. moderately hard (H4);

fracture characteristics undiscernible due to drilling methods; 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;

strong HCl reaction on disaggregated grains;

contains occasional baculite and bivalve fossils.

Descriptive summary:

36.2 to 40.0 ft. - 3° fracture, O1, T1 (CaCO3), W3

CLASSIFICATION AND

NOTES

SHEET 4 OF 4

GROUND ELEVATION: 4462.8COORDINATES: N 1,577,719.5 E 3,361,559.5

STATE: Colorado

D E

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PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

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LEVEL AND DATE MEASURED: 20.0 (4482.76) 11/2/2022

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PROJECT: Fryingpan-Arkansas

ANGLE FROM HORIZONTAL: -90 AZIMUTH: None

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GEOLOGIC LOG OF DRILL HOLE: DH-22-118

FEATURE: Arkansas Valley Conduit - Boone Reach

DEPTH TO BEDROCK: 31.8

LOCATION: CO-96, 500 ft west of Boone Rd, Boone, CO

BEGUN: 8/17/22 FINISHED: 8/18/22 TOTAL DEPTH: 40.0

HOLE LOGGED BY: E. Hammers REVIEWED BY: C. Clark

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G22

*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:

DH-22-118 OBSERVATION WELL DIAGRAM

PROJECT: Fryingpan-Arkansas GEOLOGIST: Eric Hammers

FEATURE: AVC Boone Reach DRILLER: Cody Kelly

DATE COMPLETED: 8/18/2022 HELPERS: Pete Shawver and Ryan Dedecker

3/8" Bentonite Chips

10x20 Sand

2" ID x 2.4" OD Schedule 40 PVC

End Cap Glue on

2" Schedule 40 PVC

Well Cap (Expandable and Lockable)

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

40.0' --Total depth of drill hole

25.6' --Bottom of well

20.0' --Top of screen

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

Ground Surface 0.49' --Top of Casing

Well Casing

9.0" drill hole diameter

Concrete

10x20 Sand (Drainage for Flush Mount)

1.0' --Bottom of concrete

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

6" x 10" Traffic-Rated Flush Mount Vault (lid secured with bolts) 0.11' above ground surface

Sump

2" Schedule 40 PVC

25.0' --Bottom of screen

10x20 Sand

3/8" Bentonite Chips

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

G23

Qal

0.0 to 39.8 ft.

QUATERNARY ALLUVIUM (Qal):

0.0 to 0.2 ft. LEAN CLAY CL: 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; firm;

strong HCl reaction; contains vegetation.

0.2 to 22.2 ft. LEAN CLAY CL: Approximately 95 to 100% fines with medium dry strength, no dilatancy, medium plasticity, and medium toughness; trace to approximately 5% fine to medium sand, predominantly fine, subangular to subrounded;

maximum size medium sand; 0.2 to 21.2 ft. moist,

21.2 to 22.2 ft. wet; 0.2 to 10.2 ft. brown, 10.2 to 22.2

ft. brown with gray and black mottling; 0.2 to 13.7 ft.

hard, 13.7 to 22.2 ft. firm; strong HCl reaction;

contains microcrystalline gypsum, micas, and trace CaCO3 nodules/fossils to 3/8-inch; 10.2 to 22.2 ft.

contains laminations.

Lab Test Data: Sample No. 00500-S01 6.85 to 7.20

ft. 99.2% fines, 0.8% sand, LL=55, PI=33, MC=14%, Dry Unit Weight (pcf)=104.8, Degree of Saturation=59.6%, Void Ratio=0.643, Length to Diameter Ratio=2.0, Unconfined Compressive Strength (psf)=13140, Undrained Shear Strength (psf)=6570, Lab Classification = Fat Clay CH.

Lab Test Data: 6.85 to 7.20 ft. 99.0% fines, 1.0% sand, LL=54.8, PI=33.0, MC=11.4%, Lab Classification = Fat Clay CH.

Lab Test Data: Sample No. 00500-S02 7.20 to 7.55

ft. 100.0% fines, 0.0% sand, LL=50, PI=32, MC=17.8%, Dry Unit Weight (pcf)=117.3,…