(KMOV.com) -- The Missouri Department of Natural Resources is putting out a bid request for more testing at and near the landfill in Bridgeton, following complaints of a persistent and foul odor.

According to the RFP posted on its website, the MDNR is looking for a contractor to conduct air quality testing at 18 primary sites and set up at least one meteorological station to look at data related to wind direction and wind speed. The state is requesting tests for specific chemical compounds, including Dioxins, Hydrogen Cyanide, and Sulfur Dioxide. Read the RFP here.

MDNR has also placed a trailer near the site to conduct its own on-going testing.

Renee Bungart, communications director for the MDNR, said the air testing done earlier this month was done with equipment borrowed from the EPA. A contractor would be able to do longer term testing and test for a wider range of chemicals, she said.

Last week, the MDNR responded to public information requests for previous data testing and placed hundreds of pages of information on its website. You can read the information here.

Ed Smith, with the Missouri Coalition for the Environment said the non-profit group planned to have its own health experts review the data. The Missouri Coalition for the Environment has also been calling for additional testing.

MDNR said it would order the landfill owner, Republic Services, to pay for the testing.

Last Friday, Republic Services released a statement saying that the company welcomed ongoing testing.

A quote in the statement was attributed to the company’s area president Jim Trost, “We live here, work here and want the same result as the MDNR - to dramatically reduce the odor coming from the landfill while assuring the public that the air is safe to breathe.”