The agency issued a citation for those alleged violations against the owner, Covanta Energy Corp., on June 1, and the charges carry a combined penalty of $13,500. The latest allegations came nearly two months after OSHA cited the facility for four safety violations, which carried fines totaling $6,375.

The company said it has already fixed the issues cited by OSHA. Covanta said it will withdraw its appeal of the earlier citation and will not appeal the latest citation.

"Covanta SEMASS will not pursue its right to appeal the citations because we know how important a positive relationship with OSHA and support of Local 369 (of the Utility Workers Union of America) is toward supporting our core value of employee safety and health," the company said in a statement.

Specifically, Covanta, which is based in New Jersey, is seeking to renew its membership in OSHA's Voluntary Protection Programs, which involves cooperative efforts by management, labor and the agency at participating work places. As part of the renewal process, the company is looking for the support of Local 369, which represents workers at the plant.

Staff members at the facility conduct regular inspections, and there is a safety committee run by employees, according to the company.

While Covanta is not pursuing appeals, the company added in the statement it does not agree that each of the alleged hazards was properly characterized in the citations.

OSHA said in the latest citation that workers were at risk of heat burns from accidental contact with bare flood lamps and electrical hazards due to problems with some equipment. The agency also said some rails on catwalks and stairways were corroded.

"Covanta's repeated disregard of safety rules is shocking, considering the fact that a waste incinerator is an inherently dangerous facility," said Gary P. Sullivan, president of Local 369, in a statement this week.

"Covanta is required by law to provide employees with a safe place to work, and our union will make certain this company is held accountable whenever it fails to meet that responsibility," Sullivan said.

On March 31, 2007, a fire broke out at the plant following an explosion in a garbage shredder, causing $18 million in damage. Shortly after the blaze, Covanta was cited for failing to require employees to wear suitable protective clothing, and it was forced to replace fiberglass ducts that enabled the fire to spread between buildings.

Covanta made improvements beyond what was required by code, spokeswoman Vera Carley said Tuesday.

"We invested millions of dollars to upgrade the facility," Carley said.