The plant resumed secondary treatment operations  soon after the incident and the New York Dept. of Environment and  Conservation is monitoring water readings based on plant samples, said  DEC spokeswoman Stephanie Harrington.

There is no threat to drinking water, a New York Dept. of Health spokesman said.

The LMK audit report findings include:

Vague or missing expansion joint details between the treatment cells.

Numerous leaks at intersecting cell wall  joints, likely caused by waterstops that were not installed, improperly  installed or damaged during concrete pours.

Vertical construction joints installed at 50-ft  intervals on tank and structural walls instead of 25 ft, which is more  common in wastewater treatment plants of this size. The wider spacing  increased the potential for cracking and leaking from shrinkage  stresses, the audit said.

Handrail, ladder and platform construction deficiencies in violation of OSHA and New York State Building Code requirements.

Welding specifications not followed on end caps on process air piping.

Welded stainless steel used instead of standard iron pipe and fittings at a 48-in-dia backwash wastewater suction header.

C&S Engineers Inc. of Syracuse, N.Y., the  engineer and construction manager for the $52-million upgrade, has not  spent any time getting into a detailed review of the audit, said Bob  Duclos, vice president.