I recently came across this map on Diamond Creek Vineyards website which I found very useful.
With that map, I used it to find exactly where the vineyards were on google earth and took a screenshot for all of you with labels. I think it is a bit easier to digest if you see it with the goole earth version rather than the drawing. Regardless if you haven't ever seen the original map it could be helpful.
Awesome! Love those wines...