Hi I have a development in Hornsby area. The land is sloped towards the back. According to survey, 2 metres fall in 60 metres depth. Council only allows natural gravity for storm water. That is, pump and charged system are out. I need to approach the back neighbor to get easement along his side fence. What is the "standard" procedure to start this? Leaving a postal mail? Any tips to make neighbor more willing to accept your proposal? Thanks in advance.