By DAVID PORTER NEWARK, N.J. (AP) — On a recent sun-drenched morning, the staccato rhythms of a jackhammer ricocheted off buildings as a work crew dug into a Newark street to remove an aging pipe that carried water — and potentially a poison — to a small apartment building. The new pipe is copper. The old one was lined with lead, which can be harmful to human health even at minute levels. The water