9.5
Double-Wall Tank with Well Monitoring
A monitoring well is used with a double-wall tank only if the local water
table reaches tank level. Because of the danger of water-table
contamination, install the well with a Liquid Phase Sensor.
Error! Reference source not found. is a typical wet-monitor well layout
for
a double-wall tank. Place the sensors around the tank’s perimeter.
Locate wells as close as possible to the tanks or product lines for best
sensor response. A monitoring well cross-section is also shown.
Manholes are watertight.
The monitoring well should be at least 2 feet (61 cm) deeper than
the bottom of the monitored tanks. Use 2-inch (5.1 cm) or 4-inch (10.2
cm) well casing; the perforated section should be a large portion of the
casing length. The bottom of the casing should have a cap to prevent
dirt from entering, and porous material should be backfilled around the
casing.
Figure 9-6 Double-Wall Tank with Well Monitoring
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