Gregg Drilling & Testing, offers environmental, geotechnical drilling and cone penetration testing services for site investigation and remediation. It provides services for groundwater and vapor extraction, monitoring, sparge and biovent wells. Gregg Drilling & Testing also offers services for well abandonment, aquifer testing, borehole video logging and hydraulic fracturing. Additionally, it provides well development, purging and rehabilitative services. Gregg Drilling & Testing undertakes pump installation and repair services, as well as offers hydropunch groundwater sampling systems. It operates drilling, marine and air vacuum equipment. Gregg Drilling & Testing maintains multiple offices throughout the United States with a location in Martinez, Calif.