Developers can officially bid to design the area that is to become Atlanta’s biggest park.

request for proposals to develop and design the future Westside Park at Bellwood Quarry, located on about 280 acres adjacent to the Atlanta Beltline, was posted by the city's Department of Procurement Tuesday.

The RFP comes more than two years after Mayor Kasim Reed announced plans to surround the Bellwood with a greenspace larger than Piedmont Park in Midtown. The once-abandoned quarry site is being turned into a water reservoir that will provide a billion gallon, 30-day emergency supply of water.

The Beltline master plan for the park, adopted by Atlanta City Council in March 2009, envisions a park with tournament-quality baseball, a skate park and an informal outdoor theater.

A pre-proposal conference will be held Aug. 7 at 11 a.m. at City Hall, with a virtual site tour to immediately follow. The site is located one mile west of midtown, between Johnson Road and Donald Lee Hollowell Parkway, and between Bankhead and West Midtown.

All bids are due Sept. 7 at 2 p.m.

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Watch: Channel 2 Actions News tours the quarry

Channel 2's Katie Walls got an exclusive tour of the quarry.