North East File Collection - NEFC

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===== Request =====

[[https://www.whatdotheyknow.com/request/eir_request_south_tees_site_runo|18th March 2026]]

Dear South Tees Development Corporation,

As the body responsible for the South Tees Site, I am requesting specific data regarding the management of hazardous chemical legacies inherited from the South Tees Site Company and responsible for the site's classification as a COMAH Upper Tier site.

To understand the environmental context of the site’s redevelopment, please provide:

Request: Monitoring Data: Any internal environmental impact assessments or water quality monitoring reports conducted by the STDC or its predecessors or its contractors in relation to site runoff into the River Tees during the 2017-23 period.

Please handle this request under the Environmental Information Regulations (EIR) 2004, which provide for greater transparency on matters affecting the environment.


===== Response =====

15th May 2026

Environmental Information Regulations (EIR) 2004 Act - Reference: STDC-008-2026.

Thank you for your request for information received on 18/03/2026. In response to your request, we can now provide the attached response and information - [[this>EIR/STDC/South Tees Site Runoff Environmental Assessments-EIR 008 2026 Response.pdf]].

If you have any queries or concerns, please contact [1][STDC request email] in the first instance.  

Please remember to quote the reference number above in any future communications. 

If you are unhappy with the way your request for information has been handled, you may request an internal review within 40 working days by writing to:  
  * Group Interim Monitoring Officer, South Tees Development Corporation, Teesside Airport Business Suite, Teesside International Airport, Darlington. DL2 1NJ. 

If, after your complaint has been determined, you remain dissatisfied with the handling of your request or complaint, you have a right to appeal to the Information Commissioner at:  
   * The Information Commissioner's Office (ICO), Wycliffe House, Water Lane, Wilmslow, Cheshire, SK9 5AF Telephone: 0303 123 1113 Website: [2]https://ico.org.uk/make-a-complaint/ The ICO does not make a charge for an appeal. 

Yours sincerely, [3][email address]  

TVCA Governance on behalf of South Tees Development Corporation, Teesside Airport Business Suite | Teesside International Airport, Darlington DL2 1NJ. [4]www.teesvalley-ca.gov.uk 

References

Visible links
   - mailto:[stdc%20request%20email]
   - [[https://ico.org.uk/make-a-complaint/]]
   - mailto:[email%20address]
   - [[http://www.teesvalley-ca.gov.uk/]]

[[this>EIR/STDC/South Tees Site Runoff Environmental Assessments-EIR 008 2026 Response.pdf]]


Extract:

^Month^Date^Anthracene µg/l^Benzo(a)pyrene µg/l^Benzo(b)fluoranthene µg/l^Benzo(g,h,i)perylene µg/l^Benzo(k)fluoranthene µg/l^Fluoranthene µg/l^Indeno(1,2,3-cd)pyrene µg/l^Napthalene µg/l^
|  January  |     |     |     |     |     |     |     |     |     |  
|  February  |  23/02/2021  |  0.41  |  0.23  |  0.25  |  0.1  |  <0.07  |  0.11  |  0.15  |  <0.11  |  
|  March  |  18/03/2021  |  0.18  |  0.31  |  0.47  |  0.06  |  0.24  |  0.24  |  <0.11  |  <0.11  |  
|  April  |  30/04/2021  |  0.43  |  0.41  |  0.73  |  0.3  |  0.17  |  0.15  |  0.45  |  <0.11  |  
|  May  |  24/05/2021  |  <0.09  |  0.06  |  <0.13  |  0.06  |  <0.07  |  <0.08  |  <0.11  |  <0.11  |  
|  June  |  24/06/2021  |  0.16  |  0.1  |  0.23  |  0.1  |  <0.07  |  0.11  |  0.13  |  
|  July  |     |     |     |     |     |     |     |     |     |  
|  August  |  31/08/2021  |  0.32  |  <0.06  |  <0.13  |  0.06  |  <0.07  |  <0.08  |  <0.11  |  <0.11  |  
|  September  |  28/09/2021  |  0.34  |  <0.06  |  <0.13  |  0.07  |  <0.07  |  0.09  |  <0.11  |  <0.11  |  
|  October  |  07/10/2021  |  5.34  |  63.87  |  67.56  |  30.63  |  21.63  |  69.67  |  52.3  |  0.42  |  
|  November  |     |     |     |     |     |     |     |     |     |  
|  December  |     |     |     |     |     |     |     |     |     |