Welcome to Tri-Vally Drilling Services! At Tri-Valley Drilling Services, we have the expertise for both your geotechnical drilling needs as well as your construction related drilling needs. We offer downhole logging exploratory shafts drilling services. We work with many different geotechnical firms to provide safe downhole logging and soil sampling. We also work with a variety of construction and development firms to drill foundations for piers for both residential and commercial companies as well as many other services. Call us today. We have the technical expertise to ensure that the job is not only done right but done safely.