Hertfordshire Chalk Groundwater Model Phase 2

The Hertfordshire Chalk Groundwater Model (HCGM) represents 4060km2 of the Chalk aquifer to the north-east of London, including the county of Hertfordshire, parts of Buckinghamshire, Bedfordshire, Oxfordshire, Essex, Cambridgeshire, and London. The model represents a number of Chalk streams that are situated in the Wye, Colne and Lee catchments. These catchments have been previously assessed to suffer from large scale over abstraction through the Catchment Abstraction Management Strategy (CAMS) methodology. The EA is looking to procure an external contractor to deliver Phase 2 of the project, which will deliver the Formulation of Revised Conceptual Model. This phase will refresh the existing foundation conceptual models and merge them into a single conceptual model that will then be updated. This will then support proposals for further development of the model in Phase 3. The objectives of Phase 2 are: 1. To refresh the existing foundation conceptual models and merge them into a single conceptual model

2. To gather and review necessary datasets and literature to support merged conceptual model update, reporting on initial model conceptual model uncertainty and data gaps

3. To expand the conceptual model where new data and literature is available for several concepts such as influence of superficial deposits, karstic development, evidence of hydrogeological layering within the Chalk

4. To report on the updated conceptual model and make recommendations for development and refinement of numerical model in MODFLOW 6 (Phase 3)

Additional information: Thank you for your interest in tendering for this requirement, You will need to access the documents through Bravo Solutions portal. 1) The web address is https://defra.bravosolution.co.uk and click the link to register - Accept the terms and conditions and click 'continue' - Enter your correct business and user details - Note the username you chose and click 'Save' when complete - You will shortly receive an email with your unique password (please keep this secure).

2. Express an Interest in the tender - Login to the portal with the username/password - Click the 'PQQs / ITTs Open To All Suppliers' link. (These are Pre-Qualification Questionnaires or Invitations to Tender open to any registered supplier) - Click on the relevant PQQ/ ITT to access the content. - Click the 'Express Interest' button at the top of the page. - This will move the PQQ /ITT into your 'My PQQs/ My ITTs' page. (This is a secure area reserved for your projects only) -You can now access any attachments by clicking 'Buyer Attachments' in the 'PQQ/ ITT Details' box 3. Responding to the tender - Click 'My Response' under 'PQQ/ ITT Details', you can choose to 'Create Response' or to 'Decline to Respond' (please give a reason if declining) - You can now use the 'Messages' function to communicate with the buyer and seek any clarification - Note the deadline for completion, then follow the onscreen instructions to complete the PQQ/ ITT - There may be a mixture of online and offline actions for you to perform (there is detailed online help available) You must then submit your reply using the 'Submit Response' button at the top of the page. Please give yourself enough time to complete this before the deadline. If you require any further assistance please consult the online help, or contact the e-Tendering help desk.

Please direct all questions and queries through the message function of the portal, including any clarification questions. This is to ensure no questions are missed and that all answers can be shared with all interested suppliers at the same time