ETTL offers owners and operators of groundwater monitoring and recovery wells comprehensive services, from initial well installation to plugging (abandonment), plus replacement - and all required inspection and maintenance steps in between, as described below. In addition, ETTL is available for sampling and analysis, and for collecting data measurements.

At right, ETTL technicians install a PVC monitoring well in a newly drilled borehole.
Far right, ETTL's Geoprobe™ truck-mounted percussion-probing unit (which can drill through pavement and then switch to its percussion mode) is used to install a monitoring well.

ETTL has a diversified fleet of drilling rigs and other units and equipment available for installing monitoring and recovery wells from 1" to 8" in diameter, or more, to depths of 500 ft bgs, or more. Both air-operated and electric submersible pumps are available for recovery well installations. More often than not, required monitoring and recovery wells are 150 ft bgs or less, with diameters in the 2" to 4" range; but ETTL is equipped to readily take care of installations exceeding those requirements.

Well Inspection Services

GeoVISION™ water well camera enables
ETTL to inspect inner condition of wells.

Camera, with own light, is affixed to narrow PVC pipe ...

and lowered into well so inspection can be performed.

Plastic strips affixed to pipe keep camera centered in well being inspected.

Camera is lowered to bottom of well. Condition of well ...

is displayed and also recorded audio-visually by monitor .

ETTL uses the above illustrated Geo-VISION™ water well camera and video system to identify the integrity and operating efficiency of groundwater monitoring and recovery wells from 1¼" to 24" in diameter. The viewings are especially tailored to inspect the screen portion of wells and casing joints. The visual condition not only is shown and recorded, but audio comments likewise are recorded. The camera housing is designed to operate in pressures to 200 psi (equal to 426 ft underwater).

At right, ETTL technicians work at pulling a non-operational pump from a recovery well, getting an assist from a fork lift.

At far right, data on the pulled pump are recorded by an ETTL hydrogeologist.

ETTL can carry out such groundwater well maintenance and rehabilitation services as: (1) brushing, (2) jetting (pressure wash), (3) swabbing, and (4) biological and chemical treatment. It also, as shown above, can pull non-operational pumps from recovery wells, and either reinstall them, if only minor maintenance is needed, or replace them. And ETTL can readily convert existing monitoring wells into recovery wells by installing pumps into them.

At right is the surface completion of a well consisting of a 4'x4'x4" concrete slab with a steel stick-up well head protector. It was pulled by ETTL drilling technicians from the borehole of a monitoring well when the well was plugged (abandoned) at a Superfund site. Typically when ETTL is called upon to plug groundwater wells, it also will pull as much casing from boreholes as possible, and then pressure seal the boreholes with grout.

When called upon to replace plugged wells, the same Well Installation criteria as listed above will apply.