PORTLAND, Ore. (AP) — The turnaround expert hired to fix Cover Oregon has stayed longer than expected, did more than planned and has left behind a big bill.

The Oregonian reports (http://is.gd/N6aZIq ) Clyde Hamstreet has completed his job stabilizing Oregon's health care exchange. But the cost of his work and two associates has added up nearly $600,000 and he hasn't submitted his August invoice.

Hamstreet was initially signed to a $100,000 contract in April but the scope of his contract grew and the dollar amount was amended as well.

Gov. John Kitzhaber asked Hamstreet to take over the exchange in April when he forced out three top officials.

He was hired for a four-to-six-week job that extended into five months because the reorganization turned out to be a bigger job than expected.

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Information from: The Oregonian, http://www.oregonlive.com