Tests conducted by independent contractors of a monitoring well at Tripler Army Medical Center  indicates that diesel fuel did not leak into the groundwater, the Navy confirmed Friday night.

Different contractors were hired by the Navy and the Army to conduct the testing, which showed no sign of diesel fuel in a groundwater monitoring well, said Capt. Mike Williamson, commanding officer for Navy Facilities and Engineering Command Hawaii.

“It was important that both independently conducted tests showed the same results,” Williamson said, in a release.

When a preliminary finding in May indicated high levels of diesel contamination, officials with both the state Health Department and Honolulu Board of Water Supply publicly voiced concerns about what may have cause the situation.

The news came on the heels of the Jan. 13 discovery that an underground storage tank at nearby Red Hill leaked up to 27,000 gallons of jet fuel. Navy, Health Department and BWS officials all deemed the groundwater in the area safe, but city and state officials are pushing for more monitoring and other improvements.