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degrees of hardness. Chlorine is applied in the form
of chloramine as a protective measure. Samples arc
examined daily by the Company's chemist and bacteriologist
in a well.equipped laboratory at the Sutton
works. Monthly samples are also examined by the
Company's consultant analyst, and monthly samples
are examined in rotation by the district councils in the
Drainage and Sewerage.—During the year the soil
sewer in Gander Green Lane from Cheam Road to just
beyond Bourne Way has been re-laid in cast iron.
The soil sewer from Quarry Park Road to pick up
"The Old Cottage" and the seven houses fronting St.
Dunstan's Hill, adjacent to Perrett's Brickfield., to
abolish the cesspools, has been commenced.
A new soil sewer has also been laid in Green Lane,
thus completing the soil sewerage of this road, and a
start has been made on the new soil sewer in Sandy
Lane from Glebe Road to Cuddington Avenue, and
partly along Cuddington Avenue. The construction of
new surface water sewers is in progress in the Hilldale
Road to Upper Mulgrave Road areas and in the Bushey
Lane to St. James' Road areas, and it is hoped shortly
to commence the construction of a surface water sewer
in Forest Road, Sutton.
11
area of supply. The supply has been satisfactory in
quantity and in quality, and below is a table giving the
average of monthly analyses:—
Total solid residue dried at
180º c.
Ammonia, free.
Ammonia Albuminoid.
Nitrogen as Nitrates.
Nitrogen as Nitrites.
Oxygen absorbed in 4 hours at
80ºF
Chlorine (combined).
Hardness total (soap test)
Organisms cultured on gelatine
plate for 3 days at 20º C.
On Agar plate 1 C.C. 24 hours
at 37º c.
Presence of Bacillus Coli in
100 C.C.
Average
Per c.c.
19.5
.0233
.0007
1.055
0
.0116
2.244
6.95
50
2
0