The 1990 evaluation was limited to five small trenches, their locations largely dictated by a need to probe areas close to the periphery of the site. The fifth and final trench was located in the north-western part of the bus station and measured 6.5m by 1.2m. Modern surfacing sealed a 0.65m thick accumulation of post-Roman topsoil below which was an expanse of clayey destruction debris cut by medieval robber trenches.

These trenches defined the small parts of four rooms belonging to a Roman building. Excavation beyond this point was highly selective and governed by the need to establish the condition of the rooms whilst minimising disturbance to the remains. The destruction debris proved to be comprised largely of collapsed clay walling which contained hundreds of wall-plaster fragments. Complete lengths of wall-plaster were also found in situ which was left for future recovery. Excavation ceased at a depth of 1.05m (21.75m OD) except where deeper features were dug to a depth of up to 2.5m. Prior to reinstatement, the bottom of each trench was lined with polythene sheeting and the lower part of the fifth trench was filled with sand to protect the wall-plaster.<1>