I have a traffic issue with any concentrated development of this size. Even adding a second access and if then both were made 4 lane, it will add about 10,000 additional trips a day through the surrounding areas. Some may thing this number is high, but 3080 housing units with at least 1.5 workers each is 9240 trips.That only leaves 760 extra trips for going shopping, mail and other deliveries and guests coming in to visit. Imagine how that will impact any crossing at SR99? as well as any other area in the way of getting to I-5. Sure Sound transit can help some. But don't count on it. 
Tell me  how they are going to mitigate the traffic more then a half mile out of the project.