CO129-584-9 Water Supply- Tai Lam Chung Valley reservoir 23-1-1940 - 30-3-1940 — Page 11

SITE No. 3.

TAI LAM CHUNG VALLEY

Bore Hole Record

Taken from Pages 1-53 in Daily Log Book No. 1/1

Date.

Extract made by J. G. Campbell.

Checked by..

HOLE No. 1.

Original Ground Level

14.00

Level of Top of Bore Hole (zero)

14.00

Depth

Reduced

Below Zerd

Nature of Ground

Developed

Level

Geological

Section

+14.00

Soft and decomposed

60 -2"

-46.17

Hard, coarse grained granite, jointed with apparent blue form of soapstone or

clay

63'-0"

-49.00

Hard, light grey, medium to coarse grained granite, somewhat jointed. Leakage grouted at Level -53.00

74'-7"

-60.58

Hard, coarse grained granite, badly jointed with same apparent soapstone or

clay. Occasional narrow fissures or joints disclosed by changing material in slurry tube and varying colour in flushing

water.

85'-7"

-71.58

Hard, somewhat weathered, coarse to medium grained granite, mixed with large quartz, jointed and stained at joints with same blue material.

92'-8"

-78.71

Fissure or decomposed material

93-11

-79.96

Hard, light grey granite with high

percentage of pure quartz. Less jointed with blue material

105'-5"

-91.45

(This hole may be deepened later)

C. W. E. Bishop

.Engineer-in-Charge.