"...just got my new scanner working....here's a few chestnuts for ya'll...my move topo for vice principles office, plus the notes from that days' climbing..." (BVB, supertopo.com)

Look for a trail that branches left (west), immediately off the trail that drops down on the left side of the Phd boulder. Descend and traverse back west along the slope following the least path of resistance. This will drop you on top of the Undertow boulder. A two bolt anchor is visible.