CJ Associates Geotechnical

CJ Associates Geotechnical is an established ground investigation contractor operating from Avonmouth, Bristol, with additional capabilities in Bridgend. Founded in 1974, the company supports projects throughout the UK and works as an independent business or alongside the wider RSK Group.

Its services cover ground investigation, rotary drilling, windowless sampling and cable percussion drilling, with equipment suited to a wide range of ground conditions and site constraints. The company also undertakes in-situ testing, geotechnical and materials laboratory testing, engineering services, trial pitting, detailed logging and factual or interpretive reporting.

Monitoring is another important part of the offer. Boreholes can be fitted with ground and groundwater instrumentation, including monitoring wells, standpipe and vibrating-wire piezometers, inclinometers and other equipment. Ongoing monitoring services include groundwater, gas, water quality, permeability and inclinometer measurements.

The business works across transportation, construction, housing, utilities, energy, infrastructure, defence and property, supporting local authorities, consultants, developers, contractors and private clients. Its teams combine experienced drilling operators, geotechnical engineers and geo-environmental specialists, with a strong emphasis on safety, quality, technical standards and practical delivery. Clients can draw on flexible drilling methods, restricted-access equipment and UKAS-accredited testing capabilities for complex investigation requirements.