HAVERHILL, MASS. (WHDH) - Several North Shore beaches have been cleared for swimming after water quality tests showed no evidence of elevated bacterial levels from a recent sewage leak in Haverhill, the Healey-Driscoll Administration announced Wednesday. Sandy Point Beach on Plum Island, Salisbury Beach Reservation, and beaches in Ipswich are back open to swimming after having been closed for days due to the failure of a force main associated with the South Mill Street Pump station in Haverhill.