PROJ00243

• Contract/PO #: C153680
• Contractor Name: Santa Maria Reservoir Company
• Water District: 0
• County: Hinsdale
• Bill Number: SB 94-029
• Loan Projects - Doc Type: Feasibility Study

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DRILLING METHOD

HX Coring

DEPTH TO GROUNDWATER

Not Ene.

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DESCRIPTION AND CLASSIFICATION

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SURFACE ELEVATION 281.0 feet

LOGGED BY

ntd
8/9/94

BORING DIAMETER 3-ineh

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PROJECT NO.

7147-G

DATE DRILLED

DEPTH

ZUJ~ ~
'" OUI- '" >-
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DESCRIPTION AND REMARKS

CON IST SOIL (FEET)
S TYPE

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Grey silty fine to coarse sand with gravel

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at 9 ft: scattered gravels and cobbles

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at 18 ft: rock fragments in core barrel.

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Fine, angular gravel, uniform size (1/8 to
1/4 inch)

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6 inch rhyolite fragment and 0.5 to 1.5
inch gravel
Tan / grey gravelly fine to medium sand
with some silt
Loss of mud circulation at 26 feet.
Thickened mud, about 10 % return.
Steady loss of about 8 gpm.
Rhyolite rock fragments in cor barrel, 7
pieces 1/2 to 3 inch in size.
Crushed, angular rhyolite fragments in a
silty clayey sandy matrix
at 32 ft, loss of circulation
Stedy loss of 10 to 15 gpm of drilling mud
1/4 to I inch crushed rock in silty sandy
matrix

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NORTHWEST, INC.
Consulting Engineers & Scientists

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5

10

19

19

21

15

18

20

21

.

25

21

.

30

24

35

EXPLORATORY BORING LOG B-2

CONTINENTAL DAM
HINSDALE COUNTY. COLORADO

DATE

BORING
No.

B-2

February 10, 1995