Modelling potential underwater noise levels generated during proposed impact pilling operations on the proposed Lincs Offshore Wind Farm. This study was carried out by Subacoustech Ltd. Previous measurements from other offshore construction operations using the impact piling technique were used. The propagation of underwater sound has then been modelled on a depth dependent basis to estimate the underwater sound level at range for piling of 4.5 metre and 6.5 metre turbine foundations. The study then uses this data to determine impact zones for a number of marine species in the coastal region surrounding the site. This series contains the Subsea Noise Impact Report.