---
title: "T500 Contaminant Conceptual Site Modelling"
ocid: "ocds-b5fd17-2f6e9cd6-9781-402e-8b32-d18985c42fa3"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-b5fd17-2f6e9cd6-9781-402e-8b32-d18985c42fa3"
markdown_url: "https://d3tenders.com/contract/ocds-b5fd17-2f6e9cd6-9781-402e-8b32-d18985c42fa3.md"
json_url: "https://d3tenders.com/contract/ocds-b5fd17-2f6e9cd6-9781-402e-8b32-d18985c42fa3.json"
source: "Contracts Finder"
current_stage: "Award"
buyer: "DEPARTMENT FOR ENVIRONMENT, FOOD & RURAL AFFAIRS"
published: "2026-09-02"
---

# T500 Contaminant Conceptual Site Modelling

Buyer: DEPARTMENT FOR ENVIRONMENT, FOOD & RURAL AFFAIRS  
Current stage: Award  
OCID: ocds-b5fd17-2f6e9cd6-9781-402e-8b32-d18985c42fa3

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## Summary

Defra Commercial is procuring professional services for T500 Contaminant Conceptual Site Modelling. The requirement concerns developing conceptual models of contaminant behaviour and site conditions, rather than physical construction or supply of goods. It is classified under management training services (CPV 80532000), although the tender title identifies the work as contaminant conceptual site modelling. The buyer is Defra Commercial, based at 17 Smith Square, London. Delivery locations include London and locations across the United Kingdom, Europe, the Isle of Man, the Channel Islands, British Overseas Territories and the rest of the world. This is a services requirement suitable for organisations operating across more than one geographic area.

The procurement is complete and has been awarded following a direct single-tender action below the threshold. The award was made on 2 September 2026 to Stephen Buss Environmental Consulting Ltd. The awarded value is £33,097.08. The contract is scheduled to run from 1 October 2026 to 30 September 2031. The tender submission deadline was 1 September 2026 at 12:00. The award is active, and the award and contract period are recorded against the requirement. The opportunity was marked as suitable for small and medium-sized enterprises and voluntary, community and social enterprises. The available evaluation information is limited to the single-tender route rather than a competitive scoring breakdown.

This procurement demonstrates a five-year requirement from Defra Commercial for specialist contaminant conceptual site modelling services. Businesses considering similar work should be able to analyse contaminant sources, pathways and receptors, develop defensible conceptual site models, and provide clear technical advice for environmental decision-making. Environmental consultancies with experience of public-sector requirements and the capacity to support work across the United Kingdom and wider listed locations would be well placed to compete when comparable demand returns. The award to an environmental consulting business indicates that the buyer values focused specialist consultancy rather than general construction delivery. The stated suitability for SMEs and voluntary, community and social enterprises also indicates that smaller specialist practices can be credible participants.

## Notice

T500 Contaminant Conceptual Site Modelling

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Contracts Finder |
| Latest notice | https://www.contractsfinder.service.gov.uk/Notice/a9a78cd1-08ec-4cb6-8ef5-fb84d144f312 |
| Notice type | Award Notice |
| Procurement type | Standard |
| Procurement category | Services |
| Procurement method | Direct |
| Procurement method details | Single tender action (below threshold) |
| Tender suitability | SME, VCSE |
| Awardee scale | Not specified |
| All stages | Award |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 2 Sep 2026 |
| Submission deadline | Not specified |
| Future notice date | Not specified |
| Award date | 2 Sep 2026 |
| Contract period | 1 Oct 2026 - 30 Sep 2031 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | Not specified |
| Lots value | Not specified |
| Awards value | £33,097 |
| Contracts value | Not specified |

## Status

| Field | Value |
| --- | --- |
| Tender status | Complete |
| Lots status | Not specified |
| Awards status | Active |
| Contracts status | Not specified |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | DEPARTMENT FOR ENVIRONMENT, FOOD & RURAL AFFAIRS |
| Locality | LONDON |
| Postcode area | South West London |
| Postcode | SW1P 4DF |
| Country | England |
| ITL 1 | TLI London |
| ITL 2 | TLI3 Inner London - West |
| ITL 3 | TLI35 Westminster and City of London |
| Local authority | Westminster |
| Electoral ward | St James's |
| Westminster constituency | Cities of London and Westminster |
| Delivery location | Not specified |

## Supplier

| Field | Value |
| --- | --- |
| Number of suppliers | 1 |
| Supplier names | Stephen Buss Environmental Consulting Ltd |

## CPV Codes

### Divisions

- 80 - Education and training services

### Codes

- 80532000 - Management training services

## Release History

- 2 Sep 2026 at 17:40 - Award - Award Notice - https://www.contractsfinder.service.gov.uk/Notice/a9a78cd1-08ec-4cb6-8ef5-fb84d144f312

## Documents

- https://www.contractsfinder.service.gov.uk/Notice/a9a78cd1-08ec-4cb6-8ef5-fb84d144f312
  2nd September 2026 - Awarded contract notice on Contracts Finder

## Provenance

This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-b5fd17-2f6e9cd6-9781-402e-8b32-d18985c42fa3. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-b5fd17-2f6e9cd6-9781-402e-8b32-d18985c42fa3.json.