On behalf of Channel Energy Limited, GEO has performed a geotechnical site investigation for the planned Atlantic Array Offshore Wind Farm in the Outer Bristol Channel. For the wind farm area a total of 4 out of 15 planned boreholes were executed. The boreholes were planned to penetrate to approximately 40m below seabed, however only one borehole was carried out to the planned depth. At each borehole soil samples were taken using a down-hole push/piston sampler, along with penetration tests using a piezo-cone penetrometer tool. Detailed soil/rock descriptions of all samples from the boreholes were made offshore and classification and strength tests were executed on selected samples. This series contains numerous reports, including the Field Report, which summarizes the field and offshore laboratory work for the borehole campaign, and contains detailed soil/rock descriptions and logs.