NEW YORK (AP) – Cleanup crews will labor throughout the weekend to remove tons of debris dumped on the Henry Hudson Parkway by the collapse of a near-century-old retaining wall, but Mayor Michael Bloomberg predicted a fairly normal commute next week for the highway’s 68,000 daily drivers.

“By Monday, we should be back in business at an adequate level of service,” Bloomberg said Friday at a news conference near the collapse in Manhattan’s Washington Heights. Officials were hopeful that two of the three northbound lanes would reopen on the parkway just north of the George Washington Bridge.

The cause of the collapse of the 75-foot wall, which the mayor said was built between 1907-09, remained under investigation. Bloomberg said that he anticipated the city would recoup the cost of cleanup and repair once it was determined who was liable.

People who had been evacuated from an apartment building close to the collapse were back in their homes, and life in the neighborhood in upper Manhattan was back to normal Friday. An anticipated Friday the 13th commuting nightmare never occurred as traffic was unusually light on Friday – very different from Thursday evening’s rush-hour havoc.

The three northbound lanes of the six-lane Henry Hudson Parkway, also called Route 9A, remained closed Friday from 178th to 183rd streets.

There were no injuries reported in the collapse, which came one day before an engineering firm hired by the neighboring apartment complex planned to meet with city officials about reinforcing the structure.

Residents of the Castle Village complex were told in a note two weeks ago from the co-op board that there were concerns about the wall’s stability.

AP-ES-05-13-05 1512EDT