Subject: FW: 3rd Party Planning Application - 22/2204/FUL - Amended Application From: BCTAdmin@thameswater.co.uk Sent: 23/05/2023 15:29:49 To: planning@richmond.gov.uk Subject: 3rd Party Planning Application - 22/2204/FUL - Amended Application London Borough of Richmond upon Thames Our DTS Ref: 61332 Environmental Protection and Customer Services Your Ref: 22/2204/FUL - Amended Application Civic Centre, 44 York Street Twickenham Middlesex TW1 3BZ - 23 May 2023 Dear Sir/Madam Re: St Clare Business Park , and 7-11 Windmill Rd, -, HAMPTON, -, TW12 1PZ Waste Comments There are public sewers crossing or close to your development. If you're planning significant work near our sewers, it's important that you minimize the risk of damage. We'll need to check that your development doesn't limit repair or maintenance activities, or inhibit the services we provide in any other way. The applicant is advised to read our guide working near or diverting our pipes. https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thameswater.co.uk%2Fdev elopers%2Flarger-scale-developments%2Fplanning-your-development%2Fworking-near-our- pipes&data=05%7C01%7CNetcall59r%40richmondandwandsworth.gov.uk%7C630dbdf15d8d465bb62e0 8db5b9a2bf2%7Cd9d3f5acf80349be949f14a7074d74a7%7C0%7C0%7C638204489948590901%7CUnkno wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7 C3000%7C%7C%7C&sdata=9XyYjSvVFqdUq%2FN8grDG889GZo5%2BSPlV%2B341EZv39NA%3D&reserve d=0 As required by Building regulations part H paragraph 2.36, Thames Water requests that the Applicant should incorporate within their proposal, protection to the property to prevent sewage flooding, by installing a positive pumped device (or equivalent reflecting technological advances), on the assumption that the sewerage network may surcharge to ground level during storm conditions. If as part of the basement development there is a proposal to discharge ground water to the public network, this would require a Groundwater Risk Management Permit from Thames Water. Any discharge made without a permit is deemed illegal and may result in prosecution under the provisions of the Water Industry Act 1991. We would expect the developer to demonstrate what measures will be undertaken to minimise groundwater discharges into the public sewer. Permit enquiries should be directed to Thames Water's Risk Management Team by telephoning 02035779483 or by emailing trade.effluent@thameswater.co.uk . Application forms should be completed on line via https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.thameswater.co.uk%2F&dat a=05%7C01%7CNetcall59r%40richmondandwandsworth.gov.uk%7C630dbdf15d8d465bb62e08db5b9a2 bf2%7Cd9d3f5acf80349be949f14a7074d74a7%7C0%7C0%7C638204489948590901%7CUnknown%7CT WFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000% 7C%7C%7C&sdata=8kpsRTUmpLxKrZKNnF%2BTb%2FZHmW%2FoA13Yn0EMFQRkXWU%3D&reserved=0 . Please refer to the Wholesale; Business customers; Groundwater discharges section. The proposed development is located within 15 metres of our underground waste water assets and as such we would like the following informative attached to any approval granted. "The proposed development is located within 15 metres of Thames Waters underground assets and as such, the development could cause the assets to fail if appropriate measures are not taken. Please read our guide 'working near our assets' to ensure your workings are in line with the necessary processes you need to follow if you're considering working above or near our pipes or other structures. https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thameswater.co.uk%2Fdev elopers%2Flarger-scale-developments%2Fplanning-your-development%2Fworking-near-our- pipes&data=05%7C01%7CNetcall59r%40richmondandwandsworth.gov.uk%7C630dbdf15d8d465bb62e0 8db5b9a2bf2%7Cd9d3f5acf80349be949f14a7074d74a7%7C0%7C0%7C638204489948590901%7CUnkno wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7 C3000%7C%7C%7C&sdata=9XyYjSvVFqdUq%2FN8grDG889GZo5%2BSPlV%2B341EZv39NA%3D&reserve d=0 Should you require further information please contact Thames Water. Email: developer.services@thameswater.co.uk Phone: 0800 009 3921 (Monday to Friday, 8am to 5pm) Write to: Thames Water Developer Services, Clearwater Court, Vastern Road, Reading, Berkshire RG1 8DB With regard to SURFACE WATER drainage, Thames Water would advise that if the developer follows the sequential approach to the disposal of surface water we would have no objection. Management of surface water from new developments should follow Policy SI 13 Sustainable drainage of the London Plan 2021. Where the developer proposes to discharge to a public sewer, prior approval from Thames Water Developer Services will be required. Should you require further information please refer to our website. https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.thameswater.co.uk%2Fdev elopers%2Flarger-scale-developments%2Fplanning-your-development%2Fworking-near-our- pipes&data=05%7C01%7CNetcall59r%40richmondandwandsworth.gov.uk%7C630dbdf15d8d465bb62e0 8db5b9a2bf2%7Cd9d3f5acf80349be949f14a7074d74a7%7C0%7C0%7C638204489948590901%7CUnkno wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7 C3000%7C%7C%7C&sdata=9XyYjSvVFqdUq%2FN8grDG889GZo5%2BSPlV%2B341EZv39NA%3D&reserve d=0 We would expect the developer to demonstrate what measures will be undertaken to minimise groundwater discharges into the public sewer. Groundwater discharges typically result from construction site dewatering, deep excavations, basement infiltration, borehole installation, testing and site remediation. Any discharge made without a permit is deemed illegal and may result in prosecution under the provisions of the Water Industry Act 1991. Should the Local Planning Authority be minded to approve the planning application, Thames Water would like the following informative attached to the planning permission: "A Groundwater Risk Management Permit from Thames Water will be required for discharging groundwater into a public sewer. Any discharge made without a permit is deemed illegal and may result in prosecution under the provisions of the Water Industry Act 1991. We would expect the developer to demonstrate what measures he will undertake to minimise groundwater discharges into the public sewer. Permit enquiries should be directed to Thames Water's Risk Management Team by telephoning 020 3577 9483 or by emailing trade.effluent@thameswater.co.uk . Application forms should be completed on line via https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.thameswater.co.uk%2F&dat a=05%7C01%7CNetcall59r%40richmondandwandsworth.gov.uk%7C630dbdf15d8d465bb62e08db5b9a2 bf2%7Cd9d3f5acf80349be949f14a7074d74a7%7C0%7C0%7C638204489948590901%7CUnknown%7CT WFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000% 7C%7C%7C&sdata=8kpsRTUmpLxKrZKNnF%2BTb%2FZHmW%2FoA13Yn0EMFQRkXWU%3D&reserved=0 . Please refer to the Wholsesale; Business customers; Groundwater discharges section. Thames Water would advise that with regard to WASTE WATER NETWORK and SEWAGE TREATMENT WORKS infrastructure capacity, we would not have any objection to the above planning application, based on the information provided. Water Comments If you are planning on using mains water for construction purposes, it's important you let Thames Water know before you start using it, to avoid potential fines for improper usage. More information and how to apply can be found online at thameswater.co.uk/buildingwater. On the basis of information provided, Thames Water would advise that with regard to water network infrastructure capacity, we would not have any objection to the above planning application. Thames Water recommend the following informative be attached to this planning permission. Thames Water will aim to provide customers with a minimum pressure of 10m head (approx 1 bar) and a flow rate of 9 litres/minute at the point where it leaves Thames Waters pipes. The developer should take account of this minimum pressure in the design of the proposed development. Yours faithfully Development Planning Department Development Planning, Thames Water, Maple Lodge STW, Denham Way, Rickmansworth, WD3 9SQ Tel:020 3577 9998 Email: devcon.team@thameswater.co.uk This is an automated email, please do not reply to the sender. 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