However, documents submitted on behalf of the applicant, Paul Bannister of Land Developers (Lincs) Ltd, said this could be reduced by the introduction of measures such as a green space to absorb some surface water.
If approved, the oldest elements of the police station and its frontage would remain. A modern two-storey office building and parts that were kennels and garaging would be demolished.
The council's planning committee will decide on the application on Wednesday.
