But utility company officials said Con Ed is fixing the problem and insists worker error had nothing to do with the deadly East Harlem explosion that killed eight people and injured dozens more, a spokesman said.
The Times story revealed that 301 workers who connect sections of gas main lines as part of their jobs did not have up-to-date qualifications.
Con Edison retested the workers, who install plastic pipes that carry natural gas to city buildings. Of these, 62 failed and needed to be retrained, the Times found.
“We are confident that these requalification lapses did not compromise the integrity of our gas system. All of the plastic gas piping joints and connections in our system are physically pressure tested at the time of installation to ensure pipe integrity,” Con Edison said in a statement.
“We are developing initiatives, such as more frequent leak detection surveys, to further assure the integrity of our gas-distribution system piping and are establishing additional initiatives to provide for timely requalification.”
The National Transportation Safety Board is still investigating and has yet to issue its final report.
A preliminary report into the explosion of two buildings on Park Avenue between 116th and 117th streets on March 12 found small gas leaks in a more-than century-old cast iron pipe beneath pavement and a cracked water main near the pipe.
An 8-inch plastic pipe was installed in 2011 to replace a section of the cast iron pipe.
Con Edison reportedly requalified its workers in June after the New York State Public Service Commission ordered them to take “corrective action for the protection of public safety.”