Eleven borehole were drilled along the line of the proposed inner relief road. These site investigations followed initial investigations by W. & C. French (Construction ) Limited (see ECC2193). Further information was required in connection with the design of a retaining wall at Balkerne Hill, embankments for the proposed fly-over at Colne Bank Avenue, the North Station Road Subway and North Station Roundabout. In addition to the eleven boreholes a trial pit was excavated. Boreholes 1, 2 and 3 were drilled along the line of the proposed Balkerne Hill cutting and revealed made ground to depths of between 4.30 metres beneath ground level opposite the Balkerne Gate to 1.75 m beneath ground level at the northern end of Balkerne Hill. The made ground overlay sand and gravel which was underlain by London Clay.<1>