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Denver Post reporter Mark Jaffe on Tuesday, September 27,  2011. Cyrus McCrimmon, The Denver Post

Apollo Global Management is investing $300 million in the Douglas County-based engineering firm CH2M.

“The financial and strategic benefits from Apollo’s investment and partnership will help us accelerate our growth,” CH2M CEO Jacqueline Hinman said in a statement.

Apollo, a New York-based private equity fund, will invest $200 million in convertible preferred stock, in a transaction expected to close in the second fiscal quarter.

An additional $100 million investment will occur within a year.

CH2M stock is not publicly traded. It is held by employees and former employees. Until last month, it was known as CH2M Hill.

Apollo will hold two of six independent director seats on CH2M’s board of directors. CH2M employees hold seven board seats. CH2M is a global engineering firm with annual gross revenues of $5.5 billion, according to the company.