Please see the following map I developed before all the recent talk about the phone activity was posted. I was working only with very limited phone activity info and aerial photos. I view the Pittman Wash channel as the link between the three different ping locations and would like to update the map with the most precise details.
http://maps.google.com/maps/ms?msid=214166475823961701888.0004a63137dc7312267ef&msa=0
Although a significant time has passed from when SK vanished, and probably a great amount of drainage has passed through that channel compromising the ability to locate SK's remains in the wash, there may still be some clues left behind. I don't know how sealed with concrete that channel is, but if there are small inlet pipes on the channel walls such as retaining wall weep holes, crevices, or if there are elevated ledges beneath the roadway bridges, those might have been used by SK to stash his phone, car keys, wallet, and that 8.5"x11" material in/on in the case of a suicide or voluntary disappearance. Who knows, maybe a hanging noose or some blood spatter on the channel wall may also be found. But I guess we will not know, since no one has searched the channel near the third ping. There may be many theories out there on what might have happened to SK, but how many of them actually have a narrowed down search area?