The Cambridge Waste Water Treatment Plant Relocation Order 2025

SCHEDULE 14 PARAMETERS

Article 6 PART 1 TERMINAL PUMPING STATION (WORK No. 16) (1) Item | (2) Maximum design parameter Finished ground level (FGL) (+ or – 0.5m) | 9.5m Above Ordnance Datum (AOD) Invert level (lowest internal point) of incoming sewer | -13.0m AOD (22.5m below FGL) Depth of terminal pumping station | No deeper than 25.5m below AOD (35m below FGL) including lowest point of piles Height of terminal pumping station | Up to 11.5m AOD (2m above FGL) Configuration | Circular 24m external diameter Maximum flow capacity | 7,000 l/s Overall footprint of terminal pumping station area | 65m x 115m PART 2 STORM TANKS (WORK No. 14) (1) Item | (2) Maximum design parameter Finished ground level (+ or – 0.5m) | 9.5m AOD Storm tank area | 71m long x 54m wide Depth | 4.5m AOD (5m below FGL) Foundations | -15.5m AOD (25m below FGL) Height | 14.5m AOD (5m above FGL) Stormwater storage capacity | No less than 20,400m3 PART 3 INLET WORKS (WORK No. 4) (1) Item | (2) Maximum design parameter Finished ground level (+ or – 0.5m) | 9.5m AOD Elevated screen channel – configuration | 12m wide x 3m deep x 60m long Elevated grit removal chambers – configuration | 16m wide x 3m deep x 17m long Elevated flow measurement channel – configuration | 5m wide x 3m deep x 22m long Inlet works - Height | 17.5m AOD (8m above FGL) Inlet works - Depth | 7.5m AOD (2m below FGL) to underside of structure Inlet works - Foundations | -15.5m AOD (25m below FGL) Screenings handling plant | 12m x 9m Screenings handling plant height | 13.5m AOD (4m above FGL) Number of screenings handling plant | 2 No. Grit handling plant | 8m x 3m Grit handling plant height | 13.5m AOD (4m above FGL) Footprint of odour control unit | 20m x 10m Odour control unit diameter | 5m Odour control unit height | 14.5m AOD (5m above FGL) Number of odour control units | 2 No. Number of odour control unit exhaust stacks | 2 No. Carbon vessel height | 13.5m AOD (4m above FGL) Odour control unit exhaust stack height | 25.5m AOD (16m above FGL) Overall footprint of inlet works area | 90m x 75m PART 4 PRIMARY SETTLEMENT TANKS (WORK No. 6) (1) Item | (2) Maximum design parameter Finished ground level (+ or – 0.5m) | 9.5m AOD Total surface area of circular or rectangular primary settlement tanks | 6,451m2 Number of primary settlement tanks | 6 No. Depth | 1.5m AOD (8m below FGL) Foundations | Piles to a depth of -15.5m AOD (25m below FGL) Height | 15.5m AOD (6m above FGL) Overall footprint of primary settlement tanks area | 175m x 115m Ferric dosing plant area including kiosk | 20m x 5m Ferric dosing plant: height | 14.5m AOD (5m above FGL) PART 5 ACTIVATED SLUDGE PROCESS TANKS (WORK No. 10) (1) Item | (2) Maximum design parameter Finished ground level (+ or – 0.5m) | 9m AOD Area of individual activated sludge process tanks | Reactor – 20m wide x 90m long Number of reactor tanks | 4 No. Area of mixing and conditioning tank | 25m wide x 25m long Area of interstage pumping station | 25m x 15m Depth of activated sludge process tanks, mixing and conditioning tank and interstage pumping station | 3m AOD (6m below FGL) Height of activated sludge process tanks, mixing and conditioning tank and interstage pumping station | 17m AOD (8m above FGL) Foundation depth of overall activated sludge process area | -16m AOD (25m below FGL) Blower Building – height | 14m AOD (5m above FGL) Blower Building footprint | 25m x 15m Overall footprint of activated sludge process area | 115m x 135m PART 6 FINAL SETTLEMENT TANKS (WORK No. 11) (1) Item | (2) Maximum design parameter Finished ground level (+ or – 0.5m) | 9m AOD Configuration of individual final settlement tanks | 8 No. circular tanks each with a 39m diameter Depth | 4m AOD (5m below FGL) Foundations | Piles to a depth of -16m AOD (25m below FGL) Height | 18m AOD (9m above FGL) Return activated sludge/surplus activated sludge pumps | 18 No. Overall footprint of final settlement tanks including combined return activated sludge/surplus activated sludge pumping station | 130m x 225m PART 7 TERTIARY TREATMENT PLANT (WORK No. 13) (1) Item | (2) Maximum design parameter Finished ground level (+ or – 0.5m) | 9.5m AOD Depth of filtration plant | 4.5m AOD (5m below FGL) Foundation depth | -15.5m AOD (25m below FGL) Height of filtration plant | 19.5m AOD (10m above FGL) Ferric dosing plant area | 20m x 12m Ferric dosing plant: height | 17m AOD (7.5m above FGL) Overall footprint of tertiary treatment plant | 60m x 40m PART 8 SLUDGE STORAGE CAPACITY (WORK No. 8) (1) Item | (2) Number | (3) Maximum design parameter | (4) Maximum height Finished ground level (+ or – 0.5m) | 9m AOD Imported and indigenous primary sludge tanks | 2 | Maximum sludge capacity of 1,295m3 each Subject to maximum sludge capacity, maximum 16.5m diameter | Subject to maximum sludge capacity, 17.5m AOD (8.5m above FGL) Foundation depth | Piles to a depth of -16m AOD (25m below FGL) Un-thickened sludge tanks | 3 | Maximum sludge capacity of 1,327m3 each Subject to maximum sludge capacity, maximum 16.5m diameter | Subject to maximum sludge capacity, 17.5m AOD (8.5m above FGL) Foundation depth | Piles to a depth of -16m AOD (25m below FGL) Imports and screening area | 80m x 50m | 17.5m AOD (8.5m above FGL) (excluding vent stack, see Part 10 below) PART 9 THICKENING EQUIPMENT (WORK No. 8) (1) Item | (2) Number | (3) Maximum design parameter | (4) Maximum height Finished ground level (+ or – 0.5m) | 9m AOD Building to house thickening equipment | 1 | 28m x 18m | 19m AOD (10m above FGL) Foundations | Piles to a depth of -16m AOD (25m below FGL) Thickened sludge blending tank | 1 | Maximum sludge capacity of 800m3 Subject to maximum sludge capacity, maximum 11.5m diameter | Subject to maximum sludge capacity, 19m AOD (10m above FGL) Overall footprint of thickening area | 70m x 25m | 19m AOD (10m above FGL) Foundations | Piles to a depth of -16m AOD (25m below FGL) PART 10 ODOUR CONTROL PLANT (WORK No. 8) (1) Item | (2) Number | (3) Maximum design parameter | (4) Maximum height Finished ground level (+ or – 0.5m) | 9m AOD Sludge treatment centre odour control unit 1 | 1 | 20m x 10m | Vent stack 25m AOD (16m above FGL) Sludge treatment centre odour control unit 2 | 1 | 20m x 10m | Vent stack 25m AOD (16m above FGL) PART 11 DIGESTERS (WORK No. 8) (1) Item | (2) Number | (3) Maximum design parameter | (4) Maximum diameter | (5) Maximum height Finished ground level (+ or – 0.5m) | 9m AOD Digesters capacity | 2 | 4,900m3 | 22m | 30.4m AOD (21.4m above FGL) Post digestion storage capacity | 2 | 400m3 | 8.5m | 18.5m AOD (9.5m above FGL) Heating, pasteurisation and hydrolysis (HpH) heating tank capacity | 1 | 400m3 | 7m | 24m AOD (15m above FGL) Heating, pasteurisation and hydrolysis (HpH) pasteurisation tank capacity | 2 | 400m3 | 7m | 24m AOD (15m above FGL) Heating, pasteurisation and hydrolysis (HpH) hydrolysis tank capacity | 1 | 1,500m3 | 14m | 24m AOD (15m above FGL) Overall footprint of digestion plant area | 100m x 60m | 30.4m AOD (21.4m above FGL) Depth of piled foundations | -16 AOD (25m below FGL) | – PART 12 CAKE DEWATERING AND STORAGE (WORK No. 8) (1) Item | (2) Number | (3) Maximum design parameter | (4) Maximum height Finished ground level (+ or – 0.5m) | – | – | 9m AOD Cake storage barn or silo | 1 | 30m x 40m | 18m AOD (9m above FGL) Dewatering centrifuges/volutes | 2 | 20m x 20m | Gantry height 17m AOD (8m above FGL) Foundation depth | Piles to a depth of -16m AOD (25m below FGL) Overall footprint of dewatering and cake storage area | – | 60m x 50m (9m above FGL) PART 13 LIQUOR TREATMENT PLANT (WORK No. 8) (1) Item | (2) Maximum design parameter | (3) Maximum height Finished ground level (+ or – 0.5m) | 9m AOD | – Reactor | 25m diameter | 18m AOD (9m above FGL) Stilling tank | 5m diameter | 18m AOD (9m above FGL) Settlement tank | 15m diameter | 18m AOD (9m above FGL) Foundation depth | Piles to a depth of -16m AOD (25m below FGL) Total area of liquor treatment plant | 75m x 40m | 18m AOD (9m above FGL) PART 14 NUTRIENT RECOVERY OPTION (WORK No. 8) (1) Item | (2) Maximum design parameter Finished ground level (+ or – 0.5m) | 9m AOD Number of stripping/scrubbing columns | 3 No. Stripping/scrubbing column heights | 27m AOD (18m above FGL) Stripping/scrubbing column diameters | 3m Feed pumping station – depth | 4m AOD (5m below FGL) Foundation depth | Piles to a depth of -16m AOD (25m below FGL) Total Area | 50m x 50m Total height | 27m AOD (18m above FGL) PART 15 GAS HANDLING EQUIPMENT OPTIONS (WORK Nos. 8 and 9) (1) Item | (2) Number | (3) Maximum design parameters | (4) Maximum height | (5) Maximum Capacity Finished ground level (+ or – 0.5m) | – | – | 9m AOD | – Gas holder/gas bag (Work No. 8) | 1 | 17m diameter | 29m AOD (20m above FGL) including lightning protection | 2,000m3 Flare stack (Work No. 8) | 1 | 24m AOD (15m above FGL) | 2,000m3/hr Footprint of biogas storage and operational area (Work No. 8) | 170m x 50m Foundation depth | Piles to a depth of -16m AOD (25m below FGL) EITHER Biogas upgrading plant (Work No. 9) | 1 | 50m x 50m | 21m AOD (12m above FGL) | 1,000m3/hr OR Combined heat and power (CHP) plant (Work No. 9) | 2 CHP engines | 50m x 50m | 33m AOD (24m above FGL) stack combined with boiler flue (see Part 16 below) | 1.5 MW thermal input per CHP engine (total maximum 3MWth) PART 16 STEAM RAISING BOILER (WORK No. 8) (1) Item | (2) Number | (3) Maximum design parameter | (4) Maximum height Finished ground level (+ or – 0.5m) | 9m AOD Boiler building | 1 | 20m x 20m | 17.5m AOD (8.5m above FGL) Boiler stack | 1 | 2m diameter plus access platform | Stack 33m AOD (24m above FGL) Overall footprint of boiler plant | 35m x 25m Boiler capacity | 2 | 3.5MWth each, one operational, one standby, total maximum 7MWth Foundation depth | Piles to a depth of -16m AOD (25m below FGL) PART 17 INTERNAL ROADS (FURTHER WORKS WITHIN THE INNER BOUNDARY OF WORK No. 15) (1) Item | (2) Maximum design parameter Width of two way roads | 8m wide Width of one way roads | 4m wide Total area of internal roads | 35,500m2 PART 18 BUILDINGS AND OTHER FACILITIES (WORK Nos. 3, 7, 19 and FURTHER WORKS) (1) Item | (2) Main parameters | (3) Maximum height Gateway building (Work No. 19) | 58.2m x 17.1m | 18.5m AOD (9m above FGL) Piled foundations to a depth of -15.5m AOD (25m below FGL) Workshop building (Work No. 7) | 55m x 16m | 19.5m AOD (10m above FGL) Piled foundations to a depth of -15.5m AOD (25m below FGL) District Network Operator (DNO) enclosure (Work No. 19) | 5m x 10m | 12.5m AOD (3m above FGL) Vehicle parking (Work Nos. 3, 7 and Further Works) | 4,000m2 | N/A 56 staff (including LGVs); 7 HGVs; 3 trailers; 12 visitor vehicle parking spaces (including two disabled spaces); 1 visitor coach parking space Provision for 50 bicycles PART 19 CONSTRUCTION COMPOUNDS (WORK Nos. 18, 25, 28, 32 and 34) (1) Item | (2) Maximum design parameter Existing Cambridge waste water treatment plant tunnel interception shaft (shaft 1)/pipe jack reception shaft (shaft 2) (Work Nos. 18 and 25) | 60m x 130m Pipe jack intermediate shaft 3 (Work No. 28) | 64m x 60m Pipe jack intermediate shaft 4 (Work No. 28) | 64m x 60m Pipe jack intermediate shaft 5 (Work No. 28) | 64m x 60m Riverside compound for treated effluent discharge point (Work No. 32) | 40m x 25m Waterbeach Primary Compound located at the North end of the pipeline (Work No. 34) | 100m x 100m Additional transient compounds along the Waterbeach pipeline at 1km spacing between the Main Construction Compound and the Primary Compound (Work No. 34) | 80m x 20m 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) PART 21 OUTFALL STRUCTURE (WORK No. 32) (1) Item | (2) Length/dimensions (+ or – 0.5m) | (3) Depth to invert (+ or – 0.5m) | (4) Existing and finished ground level (+ or – 0.5m) Finished ground level (+ or – 0.5m) | 4.5m AOD (0m above FGL) Outfall structure | 12m long x 7m wide x 5m deep | 0.5m AOD (4m below FGL) | 4.5m AOD (0m above FGL) North Sheet piled protection | 20m | -5.0m AOD (9.5m below FGL) | 4.5m AOD (0m above FGL) South Sheet piled protection | 35m | -5.0m AOD (10.5m below FGL) | 5.5m AOD (0m above FGL) PART 22 SOLAR INSTALLATION (WORK Nos. 7, 15 and 19) (1) Item | (2) Maximum area | (3) Minimum area Total solar installation | 7.0 Hectares | 0.0 Hectares PART 23 HEIGHTS OF SLIM STRUCTURES NOT INCLUDED IN OTHER PARTS (1) Item | (2) Height | (3) Existing and finished Ground level (+ or – 0.5m) Heights of crane jibs during construction (all Work Nos.) | 50m above existing ground level equating to 60.0m AOD | No greater than 10.0m AOD Lighting columns (Work Nos. 2, 3 and further works) | 15m AOD (5m above FGL) | No greater than 10.0m AOD PART 24 PARAPET OVER THE A14 (WORK No. 1) (1) Item | (2) Height Equestrian parapet over the A14 forming part of the highway works within Work No. 1 | 1.8m