CAMBRIDGE - Ontario's ministry of the environment says it can't release the results of surface water testing conducted along Mill Creek following a major fuel spill this winter.

The province says that report belongs to Stantec, the consulting firm hired to manage the cleanup process the province is overseeing.

Stantec's project manager, however, says the report actually belongs to the insurance company paying the bill for the cleanup. Greg Jones said the insurer has been asked to release the results.

The Ministry of the Environment, Conservation and Parks has said the test results show the traces of fuel found in water two kilometres downstream from the spill site are within acceptable levels. But it has so far declined to release the report publicly.

There's been little said publicly about the level of contamination closer to the spill site at Highway 401, where an estimated 50,000 litres of jet fuel was dumped when a tanker truck flipped trying to avoid a stalled car in January.

Work to clean up that site is expected to continue until the end of September. As a precaution, the ministry has recommended a conservation group that does rehabilitation work along Mill Creek should avoid working downstream of the spill site this summer.

The group, Friends of Mill Creek, also cancelled its annual trout stocking program for the portion of Mill Creek that runs through Soper Park in Cambridge due to contamination concerns.

A treatment to remove fuel residues from Aberfoyle Creek and Mill Creek, in the area north of Concession 2, was expected to begin Monday.

gmercer@therecord.com

Twitter: @MercerRecord