The Keuper Underground Gas Storage Facility Order 2017

Article 3

SCHEDULE 1 AUTHORISED DEVELOPMENT

NATIONALLY SIGNIFICANT INFRASTRUCTURE PROJECT

Work No.1A–An underground gas storage cavity at GR, E370280.37, N369293.28 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1B–An underground gas storage cavity at GR, E370787.74, N369459.53 of up to 100m diameter by up to130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1C–An underground gas storage cavity at GR E371332.02, N369744.22 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1D–An underground gas storage cavity at GR E370832.07, N369022.17 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1E–An underground gas storage cavity at GR, E371002.50, N369237.99 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1F–An underground gas storage cavity at GR E371300.15, N369287.26 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1G–An underground gas storage cavity at GR E371103.31, N368976.85 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1H–An underground gas storage cavity at GR, E370195.52, N370206.82 of up to 100m diameter by up to130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1J–An underground gas storage cavity at GR E371075.22, N370242.38 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1K–An underground gas storage cavity at GR E370590.41, N369240.06 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1L–An underground gas storage cavity at GR E370978.36, N370499.76 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1M–An underground gas storage cavity at GR E370914.66, N368757.87 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1N–An underground gas storage cavity at GR E371186.66, N368630.79 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1P–An underground gas storage cavity at GR E371368.25, N368892.81, of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1Q–An underground gas storage cavity at GR E371605.04, N369035.91, of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1R–An underground gas storage cavity at GR, E371578.01, N369311.02 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1S–An underground gas storage cavity at GR E371574.94, N369612.17 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1T–An underground gas storage cavity at GR E371749.84, N369855.91 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

Work No.1U–An underground gas storage cavity at GR E372023.83, N369978.09 of up to 100m diameter by up to 130m deep formed by solution mining within a depth range of 450m and 850m below ground level with a maximum drilling depth of no more than 33m below the bottom of the 30 feet marls formation identified in the seismic survey report.

ASSOCIATED DEVELOPMENT

Work No.2A – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage—

• Drilling equipment will include drilling rig, mud tanks, mud pumps, water/brine tanks, generators, cement silo, chemical store, fuel store, casing racks, pipe bin, collar bin, task lighting, temporary offices, security fencing, hardstanding, self-contained amenity facility and stores.

• Solution mining equipment will include solution mining wellhead with isolation valves and instrumentation, brine water and nitrogen pipework manifolds, isolation and shutdown valves, instrumentation, sediment collection vessel, security fencing, hardstanding, electrical and instrument kiosks, on-demand and security lighting, power and communication cables, sump and sump pump, access road, access gates and access platforms.

• Gas conversion equipment will include gas wellhead with isolation valves and instrumentation, brine, nitrogen and gas pipework manifolds, isolation and shutdown valves, instrumentation, rig to remove downhole casing under pressure (“Snubbing” rig), security fencing, hardstanding, electrical and instrument kiosks, on demand and security lighting, power and communication cables, sump and sump pump and access platforms.

• Gas storage equipment will include gas wellhead with isolation valves and instrumentation, gas and nitrogen pipework manifolds, isolation and emergency shutdown valves, instrumentation, glycol/methanol injection package (including storage vessel), operational access steelwork, security fencing, hardstanding, electrical and instrument kiosks, on-demand and security lighting, power and communication cables, sump and sump pump and access platforms.

Work No.2B – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2C – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2D – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2E – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2F – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2G – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2H – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2J – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2K – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2L – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2M – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2N – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2P – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2Q – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2R – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work. No.2S – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2T– A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.2U – A gated access wellhead compound area of up to 80m x 60m reducing after cavity drilling to no more than 50m by 50m containing vertical wells connecting the wellhead to the underground gas storage cavity. Equipment required during drilling, solution mining, gas conversion and gas storage described in Work No.2A.

Work No.3A – A buried low-pressure water pipeline 300m long and 508mm external diameter from the existing infrastructure at the Holford Gas Storage Limited former temporary solution mining compound off Drakelow Lane to the new solution mining compound (Work No.4). To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.3B – A buried low-pressure brine pipeline 300m long and 508mm external diameter from the existing infrastructure at the Holford Gas Storage Limited former temporary solution mining compound off Drakelow Lane to the new solution mining compound (Work No.4). To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.4 – A solution mining compound including pumphouse building, water boosting pumps, liquid nitrogen storage, vaporisation and distribution equipment, brine degassing tanks, weak brine pumps, electrical switchrooms, distributed control system, control and amenities building, temporary construction offices and initial construction facilities including laydown areas, security fence, task lighting, sump and sump pump.

Work No.5A – A network of buried water pipework with a combined total length of 8,100m and external diameters ranging between 274mm and 508mm from the solution mining compound (Work No.4) to the wellhead locations (Work Nos 2A to 2U). To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.5B – A network of buried brine pipework with a combined total length of 10,140m and external diameters ranging between 274mm and 508mm from the solution mining compound (Work No.4) to the wellhead locations (Work Nos 2A to 2U). To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.5C – A network of two buried nitrogen pipelines (high and low pressure) with a combined total length of 16,200m and 60mm external diameter from the solution mining compound (Work No.4) to the wellhead locations (Work Nos 2A to 2U). To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.5D – A network of buried electrical power and communication cables with a combined total length of 17,000m from the solution mining compound (Work No.4) to the wellhead locations (Work Nos 2A to 2U), the gas processing plant (Work No.14) and the national transmission system connection compound (Work No.12). To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.6 – An internal site access road network, including drainage, culverts and bridges at watercourses, to the wellhead compounds (Work Nos 2A to 2U), gas processing plant (Work No.14), solution mining compound (Work No.4), 132kV substation compound (Work No.25), the gas marshalling compounds (Work Nos 20 and No.21) and temporary construction laydown area (Work No.16) at the first gas marshalling compound (Work No.20).

Work No.7 – A site access road including drainage and culverts from the existing entrance on King Street (A530) to the gas processing plant (Work No.14), the national transmission system connection compound (Work No.12), the office, control and maintenance building (Work No.15) and the temporary construction laydown areas (Work No.16).

Work No.8 – Not used.

Work No.9 – A new pumping tank and a new surge vessel installed within the brine purification plant at Lostock works including pipework and valving connecting into the existing pumping system.

Work No.10 – A pipebridge and walkway installed at the Runcorn site as part of the installation of 600m of 508mm external diameter brine pipeline across the Weston Canal (Weaver Navigation) and then buried within the Telford Wall, between the Manchester Ship Canal and the Weston Canal eventually discharging into the Manchester Ship Canal.

Work No.11 – Re-commissioning of the Whitley pumping station for a period of 10 years from the completion of the authorised development including the installation of the pumphouse equipment (two booster pumps, two sump pumps, pipework, electrical equipment and variable speed drives) electrical supply from the Scottish Power Energy Networks supply (Work No.27) transformer, civil works and pipework, surge vessel, new roof, lighting and painting.

Work No.12 – A fenced compound and connection to the National Grid’s national gas transmission system high pressure gas pipe adjacent to King Street (A530). Including a remotely operated valve, commissioning bypass, a pig trap, connection insulation joint, instrumentation (including gas flow metering and gas calorific value metering), filters and emergency shutdown valve telemetry plus control equipment housed within a kiosk.

Work No.13 – A buried gas pipeline 500m long and 915mm external diameter between the national gas transmission system connection (Work No.12) and the gas processing plant (Work No.14). To be laid via open trench construction not less than 1.2 metre below ground and in-filled and contoured to the surrounding land.

Work No.14 – A gas processing plant including security fencing, lighting, electrical substation, instrument room, compressor house, first gas fill compressor, gas compressors, motor coolers, oil coolers, gas coolers, drying towers, air cooled condensers, regeneration heaters, water heaters building, gas manifold, metering skid, fuel gas skid, pig launcher and receiver, knock out drums and vessels, filters, flowmeters, control valves, exchangers, transformers, nitrogen package including buffer vessel, methanol/glycol recovery including pumps and storage tanks, regeneration heating vents, water heater vents, separators, emergency cold vent, surface water interceptor pit and pumps.

Work No.15 – An office, control and maintenance building and car park with 40 parking spaces located adjacent to the gas processing plant (Work No.14).

Work No.16 – Six temporary construction laydown areas including installation of cabins and provision of car parking with 260 parking spaces.

Work No.17 – A buried townswater pipeline supply 450m long and 60mm external diameter from the existing supply that runs alongside King Street (A530) to the administration building (Work No.15). To be laid via an open trench construction not less than 900mm below ground in-filled and contoured to the surrounding land.

Work No.18 – A buried sewer pipeline 450m long and 200mm external diameter routed from the administration building (Work No.15) to the existing manifold that runs alongside King Street (A530). To be laid via an open trench construction not less than 900mm below ground in-filled and contoured to the surrounding land.

Work No.19A – Two buried gas pipelines of 1140m long and 915mm (gas trading) and 219mm (first gas fill) external diameter respectively routed between the gas processing plant (Work No.14) and the gas marshalling compound (Work No.20). To be laid via open trench construction not less than 1.2metre below ground and in-filled and contoured to the surrounding land.

Work No.19B – Two buried gas pipelines of 700m long and 915mm (gas trading) and 219mm (first gas fill) external diameter respectively routed between the gas marshalling compound (Work No.20) and gas marshalling compound (Work No.21). To be laid via open trench construction not less than 1.2metre below ground and in-filled and contoured to the surrounding land.

Work No.19C – A buried gas pipeline of 340m long and between 219mm and 324mm external diameter from the gas processing plant (Work No.14) to wellhead compound (Work No.2H). To be laid via open trench construction not less than 1.2metre below ground and in-filled and contoured to the surrounding land.

Work No.20 – A gas marshalling compound including security fencing, lighting, control kiosk, and an underground pipework manifold system with valves that have extended stems (for operation above ground) connecting gas distribution pipework (Work No.22) to seven wellhead compounds (Work Nos 2A, 2B, 2C, 2E, 2J, 2K and 2L).

Work No.21 - A gas marshalling compound including security fencing, lighting, control kiosk, and an underground pipework manifold system with valves that have extended stems (for operation above ground) connecting gas distribution pipework (Work No.22) to eleven wellhead compounds (Work 2D, 2F, 2G, 2M, 2N, 2P, 2Q, 2R, 2S, 2T and 2U).

Work No.22 – A network of buried gas pipelines with a combined total length of 13,150m and external diameter between 219mm and 324mm from the gas marshalling compounds (Work No.20 and No.21) to the individual wellheads (Work No.2A to No.2U NB: excluding Work No.2H which is detailed in Work No.19C above). To be laid via open trench construction not less than 1.2metre below ground in-filled and contoured to the surrounding land.

Work No.23 – An electrical compound adjacent to the solution mining compound (Work No.4) including a brick sub-station, security fencing, lighting local transformers, associated switchgear and power factor correction equipment.

Work No.23A – A 200m long 33kV electrical supply cable routed overhead and underground from the Scottish Power Energy Networks overhead supply to the electrical compound (Work No.23).

Work No.24 – A buried fibre optic cable of up to 550 metres from the Holford Gas Storage Limited former temporary solution mining compound to the solution mining compound (Work No.4). To be laid via open trench construction not less than 1.2metre below ground in-filled and contoured to the surrounding land.

Work No.25 – A 132kV to 33kV substation compound, from the existing Scottish Power Energy Networks overhead pylon 132kV power infrastructure. The compound will include switch/control room, security fencing, lighting, a pylon, local transformers, associated switchgear and power factor correction equipment to supply the gas processing plant (Work No.14).

Work No.26 – Two 950m long 33kV electrical supply cables routed (buried and above ground) between the 132kV substation (Work No.25) and the electrical substation associated with the gas processing plant (Work No.14).

Work No.27 – An overhead 50m long 11kV electrical supply cable from the existing local Scottish Power Energy Networks overhead pole supply to the Whitley Pumping Station (Work No.11).

Work No.28A – A buried gas pipeline 570m long and 915mm external diameter between the gas marshalling compound (Work No.20) and the Holford Gas Storage Limited gas marshalling compound. To be laid via open trench construction not less than 1.2metre below ground in-filled and contoured to the surrounding land.

Work No.28B – A buried gas pipeline 1,810m long and 915mm external diameter between the gas marshalling compound (Work No.20) and the Stublach Gas Storage Project (Storengy) gas infrastructure. To be laid via open trench construction not less than 1.2metre below ground in-filled and contoured to the surrounding land.

Work No.29A – A buried water pipeline 1,650m long and 508mm external diameter connecting between the solution mining compound (Work No.4) and Stublach Gas Storage Project (Storengy) solution mining infrastructure. To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.29B – A buried brine pipeline 1,650m long and 508mm external diameter connecting between the solution mining compound (Work No.4) and Stublach Gas Storage Project (Storengy) solution mining infrastructure. To be laid via open trench construction not less than 1 metre below ground in-filled and contoured to the surrounding land.

Work No.30 - Diversion of the Scottish Power Energy Networks 11kV overhead cable located to the north of Work No.2E with a length of up to 250m including installation of two new poles.

Work No.31 – Diversion of the Scottish Power Energy Networks 33kV overhead cable located to the west of Work No.2F with a length of up to 500m including installation of three new poles.

Work No.32 – Diversion of the Scottish Power Energy Networks 11kV overhead cable located to the east of Work No.2H with a length of up to 180m including installation of two new poles.

Work No.33 – Diversion of the Scottish Power Energy Networks 33kV overhead cable located to the east of Work No.2J with a length of up to 515m including installation of five new poles.

Work No.34 – Diversion of the Scottish Power Energy Networks 33kV overhead cable located to the west of Work No.2P with a length of up to 250m including installation of four new poles.

Work No.35 – A series of precise level points 3.5m in length driven into the ground to monitor any changing underlying ground movements.