(1) All copies of site-plans of alterations and additions to existing works shall be prepared using the following fixed colours and forms of representation-

a) areas of proposed work, red;

b) work to be demolished, uncoloured and out-lined with black dotted lines;

c) new private sewers, brown;

(2) Working-drawings of alterations and additions to existing works shall be prepared using the following fixed colours and forms of representation-

a) new brick and masonry, red;

b) new concrete, green;

c) new iron or steel, blue;

d) new wood, yellow;

e) all other new materials, to be clearly indicated and to be described in words;

f) work to be demolished, uncoloured and out-lined with black dotted lines.

(3) Sewerage and drainage plans of alterations and additions to existing works shall be prepared using the following fixed colours and forms of presentation-

a) new sewers and new soil-pipes, brown;

b) new waste-pipes and new private sewers carrying trade effluent, orange;

c) new waste-pipes and new waste-sewers, green;

d) new vent-pipes to all types of pipes, red;

e) new private drains, blue.