In 2015-2017, Colchester Archaeological Trust completed the ‘Stage 2 and 3’ archaeological mitigation investigations on restricted impact locations at Colchester Garrison Alienated Land (GAL) Area B1b (previously known as Flagstaff House, now known as Arena Place) of Taylor Wimpey’s wider Colchester Garrison Alienated Land development. The investigations consisted of further trenched evaluation (ECC2913) and excavation (ECC2912) followed by monitoring of groundworks during the construction phase (ECC2911).<1><2> Archaeological monitoring of all groundworks on the development site took place over two years. The main elements consisted of groundworks for the new north/south access road and a myriad of service trenches (for drainage, water, gas and electricity). The service trenches usually measured c.0.5m wide and the manholes 2-3 square metres, and were dug to depths of between 0.7-1.6m below ground level. Only where significant archaeological remains were encountered were the groundworks recorded1 and, where possible, these remains were not excavated but recorded and left in situ. Excavation only occurred when the remains would have been truncated by the groundworks.