Nutrient Neutrality Assessment and Mitigation Strategy (NNAMS) Report - DIY?

[EViS]

Is there any reason why I could not form my own Nutrient Neutrality Assessment and Mitigation Strategy (NNAMS) report? I have read through quite a few local examples now and they largely seem to be copy-pastes of one another, inserting site specific data where relevant. Has anyone here formed their own as part of their planning application?

 

In a related question, how do you go about ensuring that there is no significant in combination effect? Is there a map source that can be checked to confirm the discharge to ground will be at least 200m from any other discharge to ground? One example site I have read through, didn't meet this criteria, however a no combination effect was proved through a drainage field plume plan. Would any of you know of how I could create my own model to show similar, if necessary after the aforementioned map check? I'm pre-empting that some neighbouring properties will have drainage fields of their own.