Attachment 3 1 00 02A Test Pit Log 0002

G14

LOG OF TEST PIT NO. TPTB-25-2

7-1336-A (1-86)
Bureau of Reclamation

FEATURE: San Juan lateral Turnout Buildings

PROJECT: Navajo Gallup Water Supply Project

GROUND ELEVATION: 5564.8 ft

COORDINATES: N 1,976,721.2 E 2,462,194.7

METHOD OF EXPLORATION: Deere 310G Backhoe

APPROXIMATE DIMENSIONS: 12'X10'X9'

LOGGED BY: C. Beyer

DEPTH TO WATER: NE

DATE EXCAVATED: 7/31/2025

DEPTH

LOCATION: Sonostee Turnout

DATE: 7/31/2025

ASSIFICATION

GROUP

SYMBOL

CLASSIFICATION AND DESCRIPTION OF MATERIAL

(CL)s

0.0 to 3.3 ft LEAN CLAY WITH SAND: About 75% fines with medium plasticity, medium dry strength, and medium toughness; about 25% fine sand; maximum size, fine sand; strong reaction with HCl.

(SEE USBR 5000, 5005)

IN-PLACE CONDITION: Gray in color, homogeneous, dry.
GEOLOGIC INTERPRETATION: Quaternary Alluvium (Qal) /BACKFILL.

3.3 ft ()

SP-SM

TEST PIT SAN JUAN LATERAL TURNOUT BUILDINGS TEST PIT LOGS.GPJ TESTPIT.GDT 9/10/25

SHEET 1 OF 1

Corrosivity
sample and
in-place
density test at
4.0 ft.

6.0 ft ()

(CL)s

3.3 to 6.0 ft POORLY GRADED SAND WITH SILT: About 90% fine sand; about 10% nonplastic fines; maximum size, fine sand; Strong reaction with HCl.
IN-PLACE CONDITION: Gray in color, homogeneous, dry.
IN-PLACE UNIT WEIGHT AND MOISTURE FROM 4.0 ft.
Total: 86.3 lb/ft³, 3.7 % (73.8 % compaction)
LAB TEST DATA: 60.0% sand, 40.0 % fines, 0 % gravel, LL=NP PI = NP, SPG=2.63
Maximum dry density: 116.9 lb/ft³, optimum water content = 13.3 % Laboratory classification is SILTY SAND.
GEOLOGIC INTERPRETATION: Quaternary Alluvium (Qal) / BACKFILL. 6.0 to 9.0 ft LEAN CLAY WITH SAND: About 75% fines; with medium plasticity, medium dry strength, and medium toughness; about 25% fine sand; maximum size, fine sand; strong reaction with HCl. IN-PLACE CONDITION: Gray in color, homogeneous, dry.
GEOLOGIC INTERPRETATION: Quaternary Alluvium (Qal) /BACKFILL.

9.0 ft ()

COMMENTS: Surface scarcely vegetated with weeds. Discontinued excavation due to difficult excavation in very stiff dry clay.

% PLUS 3 in

(BY VOLUME)

in

5 - PLUS

in
in