but employs a steerable downhole motor, which allows greater flexibility to direct the borehole, and installs the casing during the drilling process.

3. Utility Industry Compactional Drilling

This technology uses a set of hydraulic rams to drive the drill string and a wedgeshaped bit to direct the borehole.

4. River Crossing Industry Drilling

This technology uses an inclined rotary drilling rig with a steerable hydraulic jet assembly. With this technology, a pilot well is install-
ed, and the final casing is install-
ed through an overwash process.

The use of four different technolo-
gies to drill seven wells in the same area has provided a unique opportunity to assess the advan-
tages of each technology develop criteria for matching technologies with specific-site conditions.

Using directional drilling techno-
logy, a borehole can be placed horizontally through a contaminat-
ed zone to allow a greater volume to be remediated than could be achieved with vertically drilled wells. Directional drilling also al-
lows for the remediation of areas generally inaccessible by vertical drilling technologies (such as be-
neath buildings, ponds, lagoons, or landfills). The entire lateral sec-
tion of the horizontal well is