Adequately ballast the tank (add liquid) in a wet hole or in a
dry hole that may become wet (for example, from site
runoff) until the installation is totally completed. Failure to
do this may damage the tank or surrounding property.
8.1. GENERAL
8.1.1. Use only approved backfill material.
(See SECTION 4.)
8.1.2. Do not mix approved material with sand or in situ soil.
8.1.3. Do not use in situ soil as backfill material.
8.1.4. All excavated in situ soil must be replaced with approved
material.
8.2. DRY-HOLE INSTALLATION
8.2.1. Prepare a smooth level bed, 12 inches thick, of approved
backfill material.
8.2.2.
Refer to SECTION 2.1.3.
regarding the use of lifting lugs
to hoist the tank when unloading and installing it.
8.2.3. Place the tank or tanks onto the bed. Do not set Xerxes
tanks directly onto a concrete slab, on timbers or cradles, or
onto the in situ soil.
8.2.4. As the tank is being placed, slope the tank according to site
specifications. (Xerxes does not require that a tank be sloped.
The slope is determined by the tank owner’s specifications.)
8.2.5. Sloping of tanks may affect accuracy of Xerxes calibration
charts.
8.2.6. If a double-wall tank is sloped, the monitor should be at
the low end.
8.2.7. Use the tops of the ribs to establish longitudinal level.
Establish lateral level by placing the level across the top of a
fitting or a manway.
8.2.8. When the tank is placed, take a measurement of the
internal diameter of the tank.
(See SECTION 14 of the
Installation Manual
for instructions on taking diameter
measurements.)Record this measurement as Initial Internal
Diameter on the Tank Installation Checklist, Section 4.
8.2.9. If tank is to be anchored, install the anchoring hardware at
this time.
(See SECTION 6.)
8.2.10. Place one 12-inch lift of approved backfill material evenly
around the tank. From the edge of the hole or the top of an
adjacent tank, push the backfill in place by using a nonmetal
probe long enough to reach beneath the tank. Work the backfill
material under the tank body and domes so the tank is fully
supported – that is, so there are no voids under the tank.
(See
FIGURE 8-1 and FIGURE 8-2.)
6.7.1.4. The following method is
shown in FIGURE 6-8:
• loop a wire rope around the deadman at each location that cor-
responds to each rib marked with the arrowhead symbols
;
• secure the termination of the wire rope
(See SECTION 6.5.
for suggested method.)
;
• lower each deadman to the bottom of the excavation using
the wire rope;
• center each hold-down strap on each rib marked with the
arrowhead symbols
;
• bring the live end of each wire rope up to the top of the tank
at each marked rib;
• take the slack out of each wire rope and splice the termina-
tion of the wire ropes on top of the tank
(See SECTION 6.5.)
.
FIGURE 6-8
7. BOTTOM SUMPS AND FITTINGS
7.1. GENERAL
7.1.1. If the tank has a bottom sump or fitting, take extra care
that the tank does not rest or roll on the bottom sump or fitting
prior to installation.
7.1.2. During installation, provide a clear area in the backfill
bedding so that the tank rests on the backfill bedding and the
sump or bottom fitting is clear.
7.1.3. After setting the tank, fill and tamp the resulting void by
using hand tools before continuing the backfilling.
8. INSTALLATION
If product is used as ballast, exercise special care in handling.
Safeguard against sparks, fire or product spills. Improper
handling of product could cause a fire or explosion, and
death or serious injury.
Do not use air pressure to test tanks that contain or have
contained flammable or combustible liquids or vapors. The
fuel and air mixture could explode and cause death or
serious injury. Tanks should be air tested before ballasting.
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