Lauren Webster joined the Sterling Volunteer Rescue Squad at 18, and even after entering the University of Virginia, she returned every Friday to pull a 12-hour night shift as a paramedic with the group. “She lived for that,” said Michael W. Tompkins, an Alexandria lawyer who volunteers with the Friday crew. ... Lauren, 25, a Phi Beta Kappa student, was scheduled to graduate with honors today from the University of Virginia and start a job in two weeks at a National Institutes of Health genetics laboratory. Her new apartment in Bethesda was ready.