20260001_Soils Report.pdf

DRILLING METHOD SYMBOLS

Rotary Drilling Dynamic Cone or Hand Driven

FIELD AND LABORATORY TESTS

C Consolidation (ASTM D2435) CP Compaction Curve (ASTM D1557) CR Corrosion, Sulfates, Chlorides (CTM 643; ASTM

D4972, ASTM G187, ASTM D4327)

CU Consolidated Undrained Triaxial (ASTM D4767) DS Direct Shear (ASTM D3080) EI Expansion Index (ASTM D4829)

M Moisture Content (ASTM D2216)

P Permeability (ASTM 5084) PA Particle Size Analysis (ASTM D422-63 [2007])

PI Liquid Limit, Plastic Limit, Plasticity Index

(ASTM D4318)

PL Point Load Index (ASTM D5731)

PP Pocket Penetrometer R R-Value (CTM 301) RS Torsional Ring Shear (ASTM D6467) SE Sand Equivalent (CTM 217)

SW Swell Potential (ASTM D4546)

TV Pocket Torvane

UC Unconfined Compression - Soil (ASTM D2166) Unconfined Compression - Rock (ASTM D7012)

UU Unconsolidated Undrained Triaxial

(ASTM D2850)

UW Unit Weight (ASTM D4767, ASTM D7263)

VS Vane Shear (AASHTO T 223-96 [2004])

-200 200 Wash (ASTM D1140)

SAMPLER GRAPHIC SYMBOLS

Standard Penetration Test (SPT) (2" O.D.)

Standard California Sampler (2.5" O.D.)

Modified California Sampler (3" O.D.)

Thin-Walled Piston Sampler Tube

Rock Core Grab Sample

Bulk Sample Other (see remarks)

WATER LEVEL SYMBOLS

First Water Level Reading (during drilling)

Static Water Level Reading (short-term)

Static Water Level Reading (long-term)

Auger Drilling Diamond Core

REPORT TITLE

LEGEND FOR SOIL CLASSIFICATION

PROJECT NAME

Oak Mountain Landslide

DATE

9/16/2024

SHEET

GROUP SYMBOLS AND NAMES

Graphic / Symbol Group Names Graphic / Symbol Group Names

GW

Well-graded GRAVEL Lean CLAY

Lean CLAY with SAND Lean CLAY with GRAVEL SANDY lean CLAY SANDY lean CLAY with GRAVEL GRAVELLY lean CLAY GRAVELLY lean CLAY with SAND

Well-graded GRAVEL with SAND

CL

Poorly graded GRAVEL

GP

Poorly graded GRAVEL with SAND

GW-GM

Well-graded GRAVEL with SILT SILTY CLAY

SILTY CLAY with SAND Well-graded GRAVEL with SILT and SAND SILTY CLAY with GRAVEL

CL-ML SANDY SILTY CLAY

GW-GC

Well-graded GRAVEL with CLAY (or SILTY CLAY) SANDY SILTY CLAY with GRAVEL

Well-graded GRAVEL with CLAY and SAND (or SILTY CLAY and SAND)

GRAVELLY SILTY CLAY

GRAVELLY SILTY CLAY with SAND

GP-GM

Poorly graded GRAVEL with SILT

Poorly graded GRAVEL with SILT and SAND

SILT

SILT with SAND SILT with GRAVEL

GP-GC

Poorly graded GRAVEL with CLAY (or SILTY CLAY) Poorly graded GRAVEL with CLAY and SAND (or SILTY CLAY and SAND)

ML SANDY SILT

SANDY SILT with GRAVEL

GRAVELLY SILT

GRAVELLY SILT with SAND

SILTY GRAVEL ORGANIC lean CLAY ORGANIC lean CLAY with SAND ORGANIC lean CLAY with GRAVEL SANDY ORGANIC lean CLAY SANDY ORGANIC lean CLAY with GRAVEL GRAVELLY ORGANIC lean CLAY GRAVELLY ORGANIC lean CLAY with SAND

GM

SILTY GRAVEL with SAND

OL

CLAYEY GRAVEL

GC

CLAYEY GRAVEL with SAND

SILTY, CLAYEY GRAVEL ORGANIC SILT

ORGANIC SILT with SAND ORGANIC SILT with GRAVEL

SANDY ORGANIC SILT

SANDY ORGANIC SILT with GRAVEL

GRAVELLY ORGANIC SILT

GRAVELLY ORGANIC SILT with SAND

GC-GM

SILTY, CLAYEY GRAVEL with SAND

OL

Well-graded SAND

SW

Well-graded SAND with GRAVEL

Poorly graded SAND Fat CLAY Fat CLAY with SAND Fat CLAY with GRAVEL SANDY fat CLAY SANDY fat CLAY with GRAVEL GRAVELLY fat CLAY GRAVELLY fat CLAY with SAND

Elastic SILT Elastic SILT with SAND Elastic SILT with GRAVEL SANDY elastic SILT SANDY elastic SILT with GRAVEL GRAVELLY elastic SILT GRAVELLY elastic SILT with SAND

SP

Poorly graded SAND with GRAVEL

CH

Well-graded SAND with SILT

SW-SM

Well-graded SAND with SILT and GRAVEL

Well-graded SAND with CLAY (or SILTY CLAY) SW-SC Well-graded SAND with CLAY and GRAVEL

(or SILTY CLAY and GRAVEL)

MH

Poorly graded SAND with SILT

SP-SM

Poorly graded SAND with SILT and GRAVEL

SP-SC

Poorly graded SAND with CLAY (or SILTY CLAY)

Poorly graded SAND with CLAY and GRAVEL (or SILTY CLAY and GRAVEL)

OH

ORGANIC fat CLAY ORGANIC fat CLAY with SAND ORGANIC fat CLAY with GRAVEL SANDY ORGANIC fat CLAY

SILTY SAND SANDY ORGANIC fat CLAY with GRAVEL

SM

SILTY SAND with GRAVEL GRAVELLY ORGANIC fat CLAY GRAVELLY ORGANIC fat CLAY with SAND

CLAYEY SAND ORGANIC elastic SILT ORGANIC elastic SILT with SAND ORGANIC elastic SILT with GRAVEL SANDY elastic ELASTIC SILT SANDY ORGANIC elastic SILT with GRAVEL GRAVELLY ORGANIC elastic SILT GRAVELLY ORGANIC elastic SILT with SAND

SC

CLAYEY SAND with GRAVEL

OH

SILTY, CLAYEY SAND

SC-SM

SILTY, CLAYEY SAND with GRAVEL

ORGANIC SOIL

PT PEAT ORGANIC SOIL with SAND ORGANIC SOIL with GRAVEL

OL/OH SANDY ORGANIC SOIL

COBBLES SANDY ORGANIC SOIL with GRAVEL COBBLES and BOULDERS GRAVELLY ORGANIC SOIL BOULDERS GRAVELLY ORGANIC SOIL with SAND

20260001_Soils Report 20260001 Oak Mountain Fiber Relocation

WEATHERING DESCRIPTORS FOR INTACT ROCK

Diagnostic Features

Descriptor

Chemical Weathering-Discoloration-Oxidation Mechanical Weathering and Grain Boundary

Conditions Texture and Solutioning

General Characteristics Body of Rock Fracture Surfaces Texture Solutioning Fresh No discoloration, not oxidized No discoloration or oxidation No separation, intact (tight)

No change No solutioning Hammer rings when crystalline rocks are struck.

Slightly Weathered

Discoloration or oxidation is limited to surface of, or short distance from, fractures;

some feldspar crystals are dull

Minor to complete discoloration or oxidation of most surfaces

No visible separation, intact (tight)

Preserved Minor leaching of some soluble minerals may be noted

Hammer rings when crystalline rocks are struck. Body of rock not weakened.

Moderately Weathered

Discoloration or oxidation extends from fractures usually throughout; Fe-Mg minerals are "rusty"; feldspar crystals are "cloudy"

All fracture surfaces are discolored or oxidized

Partial separation of boundaries visible

Generally preserved

Soluble minerals may be mostly leached

Hammer does not ring when rock is struck. Body of rock is slightly weakened.

Intensely Weathered

Discoloration or oxidation throughout; all feldspars and Fe-Mg minerals are altered to clay to some extent; or chemical alteration produces in situ disaggregation (refer to grain boundary conditions)

All fracture surfaces are discolored or oxidized; surfaces are friable

Partial separation, rock is friable; in semi-arid conditions, granitics are disaggregated

Altered by chemical disintegration such as via hydration or argillation

Leaching of soluble minerals may be complete

Dull sound when struck with hammer; usually can be broken with moderate to heavy manual pressure or by light hammer blow without reference to planes of weakness such as incipient or hairline fractures or veinlets. Rock is significantly weakened.

Decomposed Discolored of oxidized throughout, but resistant minerals such as quartz may be unaltered; all feldspars and Fe-Mg minerals are completely altered to clay

Complete separation of grain boundaries (disaggregated)

Resembles a soil; partial or complete remnant rock structure may be preserved;

leaching of soluble minerals usually complete

Can be granulated by hand.

Resistant minerals such as quartz may be present as "stringers" or "dikes".

Note: Combination descriptors (such as "slightly weathered to fresh") are used where equal distribution of both weathering characteristics is present over significant intervals or where characteristics present are "in between" the diagnostic feature. However, combination descriptors should not be used where significant identifiable zones can be delineated. Only two adjacent descriptors shall be combined. "Very intensely weathered" is the combination descriptor for "decomposed to intensely weathered".

FRACTURE DENSITY

Descriptor Criteria Unfractured No fractures Very Slightly Fractured Lengths greater 3 ft Slightly Fractured Lengths from 1 to 3 ft, few lengths outside that range Moderately Fractured Lengths mostly in range of 4 in. to 1 ft, with most lengths about 8 in.

Intensely Fractured Lengths average from 1 in. to 4 in. with scattered fragmented intervals with lengths less than 4 in.

Very Intensely Fractured Mostly chips and fragments with few scattered short core lengths

REPORT TITLE

LEGEND FOR ROCK CLASSIFICATION

PROJECT NAME

Oak Mountain Landslide

DATE

9/16/2024

SHEET

ROCK GRAPHIC SYMBOLS

IGNEOUS ROCK

SEDIMENTARY ROCK

METAMORPHIC ROCK

BEDDING SPACING

Descriptor Thickness or Spacing Massive > 10 ft Very thickly bedded 3 to 10 ft Thickly bedded 1 to 3 ft Moderately bedded 3-5/8 inches to 1 ft Thinly bedded 1-1/4 to 3-5/8 inches Very thinly bedded 3/8 inch to 1-1/4 inches Laminated < 3/8 inch

CORE RECOVERY CALCULATION (%)

Length of the recovered core pieces (in.) x 100 Total length of core run (in.)

ROCK HARDNESS

Descriptor Criteria Extremely Hard

Very hard

Hard

Moderately Hard Moderately Soft Soft

Very Soft

Specimen cannot be scratched with pocket knife or sharp pick; can only be chipped with repeated heavy hammer blows Specimen cannot be scratched with pocket knife or sharp pick; breaks with repeated heavy hammer blows Specimen can be scratched with pocket knife or sharp pick with heavy pressure; heavy hammer blows required to break specimen Specimen can be scratched with pocket knife or sharp pick with light or moderate pressure; breaks with moderate hammer blows Specimen can be grooved 1/6 in. with pocket knife or sharp pick with moderate or heavy pressure; breaks with light hammer blow or heavy hand pressure Specimen can be grooved or gouged with pocket knife or sharp pick with light pressure, breaks with light to moderate hand pressure Specimen can be readily indented, grooved, or gouged with fingernail, or carved with pocket knife; breaks with light hand pressure

RQD CALCULATION (%)

Length of intact core pieces > 4 in. x 100 Total length of core run (in.)

Sa m pl e

Lo ca tio n

Sa m pl e

N um be r

Bl ow s pe r 6 in

Bl ow s pe r f oo t

R ec ov er y

R Q

D

M oi st ur e

C on te nt

D ry

U ni t W ei gh t

(p cf

Sh ea r S tre ng th

(k sf

D ril lin g

M et ho d

C as in g

D ep

LOGGED BY BEGIN DATE COMPLETION DATE HAMMER TYPE BORING NUMBER

L. Salemme/ J. King 8-1-24

FINAL BY

J. Ross

DRILLING METHOD

Hand Auger

DRILLER

Yeh

8-1-24 N/A BOREHOLE LOCATION (Lat/Long or North/East and Datum) N 2038840.9321 ft/E 5808510.9497 ft

BOREHOLE LOCATION (Offset, Station, Line)

LOCATION DESCRIPTION

Downslope of Station Rd near approximate toe of landslide

24E-01

SURFACE ELEVATION

1797.0 ft

WEATHER NOTES

Sunny, warm

BACKFILLED WITH

Native

DRILL RIG

4" Hand Auger

GROUNDWATER

READINGS

DURING DRILLING AFTER DRILLING (DATE)

Not Encountered

TOTAL DEPTH OF BORING

10.0 ft

DESCRIPTION Remarks

0 CLAYEY SILT with SAND (ML/CL); medium stiff; black;

dry; (LANDSLIDE DEPOSITS).

1795 2

1793 4

1791 6

1789 8

1787 10

1785 12

1783 14

1781 16

1779 18

Dark brown; moist.

Black.

Cobble.

Fat CLAY with SAND (CH); stiff; black; moist;

(COLLUVIUM). A

Very stiff; brown; fine to coarse, angular GRAVEL;

clasts of MONTEREY SHALE.

Very moist; caliche stains.

B

SANDY fat CLAY with GRAVEL (CH); hard; brown;

moist; fine to coarse angular clasts of MONTEREY

SHALE; (MONTEREY FORMATION).

Bottom of borehole at 10.0 ft bgs

This Boring Record was developed in accordance with the Caltrans Soil & Rock Logging, Classification, and Presentation Manual (2022) except as noted on the Soil or Rock Legend or below.

47 73

-200 (1% G, 22% S, 77% F)

PI (103 LL, 41 PL, 62 PI)

-200 (2% G, 15% S, 84% F)

PI (104 LL, 40 PL, 64 PI)

-200 (14% G, 11% S, 75% F)

PI (95 LL, 36 PL, 59 PI)

PROJECT NAME

Oak Mountain Landslide

PROJECT NUMBER

224-034

BORING NUMBER

24E-01

REVISION DATE

9/16/2024

SHEET

1 of 1 5

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Bl ow s pe r f oo t

R ec ov er y

R Q

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M oi st ur e

C on te nt

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U ni t W ei gh t

(p cf

Sh ea r S tre

D ril lin g

M et ho d

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LOGGED BY

L. Salemme

FINAL BY

J. Ross

DRILLING METHOD

4" Solid Stem

DRILLER

BEGIN DATE

8-1-24

COMPLETION DATE

8-1-24

HAMMER TYPE

140 lb Autotrip

BOREHOLE LOCATION (Lat/Long or North/East and Datum) N 2038785.794 ft/E 5808487.8361 ft

BOREHOLE LOCATION (Offset, Station, Line)

LOCATION DESCRIPTION

BORING NUMBER

24E-02

SURFACE ELEVATION

1819.8 ft

WEATHER NOTES

Sunny, warm

BACKFILLED WITH

Britton Exploration Downslope of Station Rd within body of landslide Native

DRILL RIG

CME 55

GROUNDWATER

READINGS

DURING DRILLING AFTER DRILLING (DATE)

Not Encountered

25.7 ft

1818 2

1816 4

1814 6

1812 8

1810 10

Well-graded SAND with GRAVEL (SW); very loose;

dark gray; dry; fine to coarse, subangular to angular

GRAVEL; (LANDSLIDE DEPOSITS).

Loose.

CLAYEY GRAVEL with SAND (GC); medium dense;

gray to black; dry to moist.

SILTY CLAY (CL-ML); stiff; dark brown to black; moist.

SANDY fat CLAY with GRAVEL (CH); stiff; dark brown;

moist; (COLLUVIUM).

10 3

11 3

12 7

13 4

14 2

15 2

16 6

6 33

6 6

27 67

22 22

12 83

8 100

30 67

8 70

35 60

53 67

39 80

1PP

1.8PP

2PP

CR (pH = 7.50, r = 6,598 ohm-cm, SO 2- = 32 mg/kg, Cl- = 3 mg/kg)

-200 (38% G, 19% S, 42% F)

DS

PI (98 LL, 33 PL, 65 PI)

CR (SO 2- = 52 mg/kg, Cl- = 3 mg/kg)

CU

1808 12

1806 14

SEDIMENTARY ROCK; light brown; decomposed;

decomposes to gravelly lean CLAY (CL); dry, blocks of intact Shale in clayey matrix; (MONTEREY

FORMATION).

17 50/5.REF/5.5"00

1804 16

1802 18

(continued)

18 3

21 100

PROJECT NUMBER

224-034

BORING NUMBER

24E-02

1 of 2 5

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Lo ca tio n

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N um be r

Bl ow s pe r 6 in

Bl ow s pe r f oo t

R ec ov er y

R Q

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M oi st ur e

C on te nt

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U ni t W ei gh t

(p cf

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1798 22

1796 24

1794 26

1792 28

1790 30

1788 32

1786 34

1784 36

1782 38

1780 40

1778 42

Decomposes to lean CLAY (CL); medium stiff, moist.

SEDIMENTARY ROCK (continued).

Decomposes to lean CLAY (CL); hard, moist.

Bottom of borehole at 25.7 ft bgs

19 50/3"REF/3"100

20 50/2"REF/2"100

0.6PP

4.0+PP

PROJECT NUMBER

224-034

BORING NUMBER

24E-02

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5" pl e

Lo ca tio n

Sa m pl e

N um be r

Bl ow s pe r 6 in

Bl ow s pe r f oo t

R ec ov er y

R Q

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M oi st ur e

C on te nt

D ry

U ni t W ei gh t

(p cf

Sh ea r S tre

D ril lin g

M et ho d

C as in g

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LOGGED BY

L. Salemme

FINAL BY

J. Ross

DRILLING METHOD

4" Solid Stem

DRILLER

BEGIN DATE

8-1-24

COMPLETION DATE

8-1-24

HAMMER TYPE

140 lb Autotrip

BOREHOLE LOCATION (Lat/Long or North/East and Datum) N 2038769.263 ft/E 5808479.8434 ft

BOREHOLE LOCATION (Offset, Station, Line)

LOCATION DESCRIPTION

BORING NUMBER

24E-03

SURFACE ELEVATION

1823.6 ft

WEATHER NOTES

Sunny, warm

BACKFILLED WITH

Britton Exploration 15 feet north of north ETW of Station Rd Native

DRILL RIG

CME 55

GROUNDWATER

READINGS

DURING DRILLING AFTER DRILLING (DATE)

Not Encountered

15.0 ft

1822 2

CLAYEY GRAVEL with SAND (GC); medium dense;

light to dark brown; dry; fine to coarse, subangular to angular GRAVEL; (LANDSLIDE DEPOSITS).

1 8 16 100

11 93

1820 4

1818 6

Fat CLAY with SAND (CH); stiff; dark brown; moist.

2 6 15 67

3 3 31 67

4 5 24 44

19 90

1.4PP

-200 (44% G, 30% S, 27% F) CR (SO42- = 41 mg/kg, Cl- = 6 mg/kg)

CU

-200 (1% G, 18% S, 81% F)

1816 8

SANDY fat CLAY with GRAVEL (CH); stiff; dark brown;

moist; (COLLUVIUM).

5 5 16 100

46 74 2PP DS

6 4 9 10

31 67 38 90 CR (pH = 7.80, r = 1,109 ohm-cm, SO 2- = 48 mg/kg, Cl- = 8 mg/kg)

1814 10

1812 12

1810 14

1808 16

1806 18

Fat CLAY with SAND (CH); very stiff; brown; moist;

trace gravel sized blocks of SHALE; (MONTEREY

FORMATION).

SEDIMENTARY ROCK; light brown; decomposed;

decomposes to gravelly lean CLAY (CL).

White.

Bottom of borehole at 15.0 ft bgs

Presentation Manual (2022) except as noted on the Soil or Rock Legend or below.

7 6 20 100

8 50/1"REF/1"100

9 50/0.REF/0.5"00

3.5PP -200 (1% G, 24% S, 75% F)

PI (101 LL, 37 PL, 64 PI)

Rig chatter

PROJECT NUMBER

224-034

BORING NUMBER

24E-03

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Lo ca tio n

Sa m pl e

N um be r

Bl ow s pe r 6 in

Bl ow s pe r f oo t

R ec ov er y

R Q

D

M oi st ur e

C on te nt

D ry

U ni t W ei gh t

(p cf

Sh ea r S tre

D ril lin g

M et ho d

C as in g

D

LOGGED BY

L. Salemme

FINAL BY

J. Ross

DRILLING METHOD

4" Solid Stem

DRILLER

BEGIN DATE

8-1-24

COMPLETION DATE

8-1-24

HAMMER TYPE

140 lb Autotrip

BOREHOLE LOCATION (Lat/Long or North/East and Datum) N 2038742.7793 ft/E 5808469.3354 ft

BOREHOLE LOCATION (Offset, Station, Line)

LOCATION DESCRIPTION

BORING NUMBER

24E-04

SURFACE ELEVATION

1830.1 ft

WEATHER NOTES

Sunny, warm

BACKFILLED WITH

Britton Exploration 2 feet south of south ETW of Station Rd Native

DRILL RIG

CME 55

GROUNDWATER

READINGS

DURING DRILLING AFTER DRILLING (DATE)

Not Encountered

11.5 ft

1828 2

Well-graded SAND with GRAVEL (SW); loose; light brown; moist; (ARTIFICIAL FILL).

SILTY CLAY (CL-ML); soft; dark brown to black; moist;

(COLLUVIUM).

21 8

-- 3

12 67

7 0

1826 4

SEDIMENTARY ROCK; light brown; intensely weathered; soft; (CLAYEY GRAVEL (GC); medium dense); (MONTEREY FORMATION).

22 8

29 100 0.5PP -200 (68% G, 10% S, 22% F)

PI (69 LL, 27 PL, 42 PI)

1824 6

1822 8

23 11 REF/3"100

50/3"

1820 10

1818 12

1816 14

1814 16

1812 18

Decomposed; decomposes to fat CLAY (CH); hard, seams vary between light brown, orange to light brown, moist.

Bottom of borehole at 11.5 ft bgs

24 7

51 100

4.5+PP

PROJECT NUMBER

224-034

BORING NUMBER

24E-04

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224-034

224-034

224-034

224-034