[eeyore]

I wouldnt use the noise argument with the parks dept man if i were you as there is a wealth of research that shows hedges etc are not an effective barrier to road noise. a sound boarded fence is far more effective.

also be aware that not all chainsaw work is bad - much reserves work involves the felling or other management of trees ( I work in conservation and will shortly be doing some extensive pruning to open up a footpath to legal width)

that said it would be reasonable to suggest that the council replant a hedfge inside the sound boarding , but probably wise to focus the argument on nesting habitat /biodiveristy rather than the acoustics.