The Key Constraints plan at Fig.21 identifies the "Sensitive Relationship with existing employment uses" which surrounds the existing employment area at Bourn Airfield.

This includes the site which DB Group operate from. The operations and processes which take place on site include the following:
* Sand grading - filtering sand to provide different levels of fineness;
* Production of additives used in concrete mixes - blending of powders from silo storage;
* Warehousing - receipt and dispatch of goods either manufactured or purchased off site for resale.

These uses, in combination, amount to a B2 General Industrial use. The blending and grading process undertaken on site generates external noise, particularly in respect of the extraction system used to reduce material spillage and particles in the air. The site is also serviced by an average of 2 incoming and 3 outgoing HGV movements a day.

It is essential that the proposed Bourn Airfield New Village takes full account of DB Group's existing operations and will not hamper future expansion plans. This will require particular consideration being given to adequate distance separation from noise sources, site and building layout / orientation, provision of acoustic barriers as deemed necessary (to be provided at the developer's expense) as a result of detailed assessments in accordance with the PPG.