# The Cambridge Waste Water Treatment Plant Relocation Order 2025, Part 20: TRANSFER TUNNEL (WORK Nos. 18 and 27)


(1) Item
(2) Diameter
(3) Height
(4) Depth to Invert (+ or – 0.5m)
(5) Existing and finished ground level (+ or – 0.5m)
Shaft 1 (interception shaft) (Work No. 18)
Maximum 9m
-
-11.0m AOD (18m below FGL)
7m AOD (0m above FGL)
Shaft 1 vent stack and odour control height (Work No. 18)
17m AOD (10m above FGL)
6m AOD (1m below FGL)
7m AOD (0m above FGL)
Shaft 2 (Work No. 18)
12m
-
-11.0m AOD (18m below FGL)
7m AOD (0m above FGL)
Shaft 1 and 2 combined option (Work No. 18)
Remaining shaft 9m – temporary excavation 20m x 10m
-
-11.0m AOD (18m below FGL)
7m AOD (0m above FGL)
Shaft 3 (Work No. 27)
12.5m
-
-11.5m AOD (21m below FGL)
9.5m AOD (0m above FGL)
Shaft 4 (Work No. 27)
9.0m
-
-12.0m AOD (21m below FGL)
9.0m AOD (0m above FGL)
Shaft 5 (Work No. 27)
12.5m
-
-12.5m AOD (23.5m below FGL)
11.0m AOD (0m above FGL)

---
Source: https://www.legislation.gov.uk/uksi/2025/452/schedule/14/part/20 (the official version)
Page: https://openlegislation.uk/cambridge-waste-water-treatment-plant-relocation-order-2025/schedule-14/part-20
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.