Exploratory Field Services

EEI maintains its own exploratory equipment for performing field services. We currently operate nine hollow stem auger/mud rotary drilling rigs for field exploration services that includes 4 truck-mounted units, 1 ATV-mounted skid unit, 3 ATV rubber-tire units and 1 ATV track-mounted unit. In addition, we have two track- and one truck-mounted direct push units (Geoprobe®). With the skid-and track-mounted units, our personnel are able to reach difficult access locations such as building interiors and confined areas.

We feel competent to perform the drilling tasks associated with the geotechnical and environmental industries because 1) our management is capable of properly directing all personnel assigned to any given project, 2) our field personnel are highly experienced and with our drilling foremen combining for over 180 years of experience, 3) our drilling equipment is state-of–the-art and well maintained, 4) we adhere to our own health and safety plan or adopt that of the client and 5) our experience lends itself to familiarity with problems that arise on difficult geotechnical and hazardous waste sites and how to handle those problems efficiently and timely.

A partial listing of our exploratory field services is listed below:

Soil/Rock Sampling and In Situ Testing

  • Crews can obtain geotechnical or environmental samples using 2-in. or 3-in. O.D. split spoon samplers at any interval desired using the Standard Penetration Test (ASTM D 1586).
  • Undisturbed samples of cohesive soils can be obtained using 2-in., 3-in. or 5-in. Shelby tube (ASTM D 1587) or continuous samplers.
  • Rock coring (ASTM D 2113) using conventional or wire-line methods up to 300 ft in depth.
  • Menard in situ pressuremeter testing.
  • Vane shear testing

Direct-Push Services

  • Soil and groundwater samples can be obtained for the environmental industry using direct push techniques utilizing Geoprobe® equipment. Sampling includes dual-tube tooling for most applications and macro sampling if below the water table.
  • Discreet groundwater samples are obtained using submersible pumps, check ball or bailers.
  • Various chemicals are injected into the ground for remediation sites.

Monitoring Well Installation

  • Earth Exploration, Inc. (EEI) installs 1-in. through 10-in. I.D. wells to project specifications with 3¼-in., 4¼-in., 6¼-in., 8¼-in. or 12¼-in. I.D. hollow stem augers.
  • In situations where rock is encountered, wells are installed via coring of the rock and then reaming with roller bits ranging from 4 to 8 in.
  • EEI can supply and install PVC, stainless steel, galvanized steel or carbon steel well materials and lockable protective steel casing or flush grade water-tight manholes.
  • Wells are normally installed with sand or gravel packs, bentonite seals and bentonite or cement grout.
  • Double casing (4- to 10-in. diameter) can be installed when subsurface conditions warrant stratum isolation.
  • Field crews can perform bail, pump and slug tests to help determine hydrological parameters.
  • EEI arrives on site fully equipped with all well materials and supplies or well materials may be supplied by our client.
  • Wells are developed by air displacement, a 2- or 3-in. submersible well pump system, hand bailers or positive displacement pumps mounted on the drilling units.
  • Field sampling personnel are available to purge and sample monitoring wells on a regular basis.
  • We have successfully refurbished wells that have been silted in or have experienced excess deposits/scaling using chemicals, brushes, pumps and/or surge blocks.
  • Wells no longer in service are abandoned according to department of natural resources guidelines and well abandonment forms submitted.


  • Each drilling unit and all associated augers, rods, samplers and hand tools are decontaminated with a hot water pressure washer prior to mobilizing to each project site.
  • The drilling equipment and tooling are decontaminated between borings and prior to installation using a hot water pressure washer.
  • A portable equipment decontamination station can be supplied or a more elaborate one constructed if containment of decontamination water is necessary.
  • Drill cuttings, development water and decontamination water can be collected for disposal if necessary.

Health and Safety

  • Field personnel are in compliance with OSHA regulations for workers on hazardous waste sites and are enrolled in the EEI medical monitoring program.
  • EEI maintains its own health and safety plan when no other formal plan is available. We can also implement site specific health and safety plans for individual projects.
  • Field crews are equipped and trained to operate at personnel protective Levels D, C
    and B.


  • EEI operates field equipment which is well maintained for dependability. All drilling units are equipped with automatic SPT hammers for safety and ease of operation. In addition, separate pumps are mounted on the drilling units to facilitate wash rotary techniques and borehole grouting.
  • We maintain a company-owned segmental barge for investigating soils beneath bodies of water such as lakes and lagoons and have access to larger units for rivers.
  • Our drilling units include the following:
Type Make/Model Year
Drill Rig-Truck Mounted CME 55 2015
Drill Rig-ATV Mounted CME 750X 2009
Drill Rig-Truck Mounted CME 75HD 2008
Drill Rig-Track Mounted CME 55/300 2007
Drill Rig-ATV Mounted Diedrich D-120 2000
Drill Rig-ATV Mounted Diedrich D-120 1998
Drill Rig-Truck Mounted CME 75HD 1996
Drill Rig-ATV/Skid Mounted CME 45C 1995
Drill Rig-Truck Mounted CME 75HD 1994
Drill Rig-Truck Mounted SIMCO/2400 1995
Direct Push Rig-Track Mounted Geoprobe® 7720DT 2008
Direct Push Rig – 4X4 Truck Mounted Geoprobe® 6600 2000
Direct Push Rig – Track Mounted Geoprobe® 54LT 1999

Various transport, utility and cargo trailers and support trucks.