Are they taking away land? Does your land go all the way to the water? I wouldn't really have a problem as long as it's marked "No Trucks Allowed" (except emergency trucks).
They are not taking land, but they are demanding a public permission to pass without compensation. Our property line to the West is 'mean high-tide'. Technically, I could deny permission to pass, but that's nothing I would ever consider. What the California Coastal Commission wants is public permission to pass to the "...first line of vegetation...". I only have a problem with this because it is a vague definition, and in the event of a severe storm/ or small tsunami that washed away the vegetation, the public would then have legal access directly in front of the house. Understandably, this troubles me. If they were to re-phrase (I only have this verbally, no documentation yet) and request permission to pass say 50' above mean high tide, I would have no real concerns. We'll see how it goes. It will not become an issue until the construction is complete and I want my 'Certificate of Occupancy' from the county.
Through the years, most of the people in the construction business I have dealt with, have a rather elongated sense of completion time. Example; 'The job will take 2 weeks, tops.' And they finally finish 2 months later. In your case, I hope it only takes 4-5 months. But, my guesstimate is that they will really finish in 6-7 months. Good luck, you have some beautiful coastline. Keep us updated with the progress.
I'm laughing!!! I'm a building contractor, and we are trained by the State to drag projects out WAY past the realm of reason--it's a requirement!