socalquest,
Yes. For every buyer, they are provided with the so the called environmental report, with very detailed descriptions of everything surrounding the Stonegate area, including the future Gateway Park, farming activities near-by, the reservoir and of course the landfill (unfortunately ancient Indian burial sites and Honor Farm are excluded). You'd get the same thing for Laguna Altura which probably would include noise disturbance from 133 and 405, and future retail developement across Laguna Canyon road.
Sand Canyon is the designated commercial truck route and the landfill is expected to open until 205x. So people who live by Sand Canyon and Portola (Bee's canyon access road to the landfill is on Portola and north of Paragon) are screwed.