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A Davenport man on Tuesday admitted in federal court that he conspired to grow a large amount of marijuana in a Davenport warehouse in 2016.

Shawn Michael Manning, 44, pleaded guilty in U.S. District Court, Davenport, to one count of conspiracy to manufacture a controlled substance being at least 100 kg of a mixture and substance containing marijuana or at least 100 marijuana plants.

He faces five to 40 years in prison when he is sentenced June 11.

According to the plea agreement filed Monday:

Beginning around Nov. 1, 2016, through Dec. 26, 2016, Manning and at least one other person reached an agreement or came to an understanding to manufacture marijuana in Davenport.

Manning admitted that he knowingly entered into an agreement with other unidentified individuals to build a marijuana grow operation in a warehouse located in the 900 block of South Rolff Street.

In furtherance of the conspiracy, Manning assisted with the construction of the marijuana grow operation and the harvesting of marijuana plants.

The Davenport Police Department executed a search warrant at the warehouse Dec. 29. 2016, and seized approximately 689 marijuana plants and five pounds of marijuana wax.

Police also seized a Springfield XDM 9mm handgun at his home in the 3200 block of Indian road. Manning admitted that he possessed the gun for protection from associates affiliated with the marijuana grows, according to the plea agreement.

Manning has several felony convictions in Rock Island County and is prohibited from possessing or owning a firearm.

In exchange for his plea, federal prosecutors agreed that they will not seek an enhanced sentence because of his prior felony convictions.

Charges stemming from the marijuana investigation are still pending against Lester J. Monkus II, 32, and Jessica A. Dorsey, 33, both of Davenport, in Scott County District Court.

They two are charged with possession with intent to deliver marijuana, conspiracy to manufacture, deliver and/or possess with intent to deliver marijuana, and failure to affix drug tax stamp.

Monkus and Dorsey both have a status hearing Feb. 13.

Manning also originally was charged in Scott County, but those charges were dismissed when he was indicted in federal court in August.