Last month, dignitaries including Sen. Robert Menendez and Albio Sires gathered at the Hoboken Housing Authority to cut the ribbon on a $900,000 project to refurbish Mama Johnson Field. Eleven days later, on Oct. 29, Hurricane Sandy flooded the field with contaminated water. The Hoboken Housing Authority is now stuck with a $20,000 bill to sanitize and restore the field at 400 Harrison St. near Fourth Street, said Hoboken Housing Executive Director Carmelo Garcia. That is just a fraction of the costly damage the Hoboken Housing Authority has been dealing with since Hurricane Sandy hit three weeks ago, officials said. The Hoboken Housing Authority estimates a loss of more than $1.5 million due to Sandy, Garcia said. “Many of our residents are already in need of assistance, whether it is physical or financial,” Garcia said in a statement. “Many have been unable to work and take care of daily responsibilities.” Garcia said donations are still being accepted at 221 Jackson St.