Instructions / Assembly

A. Do not install any tank in water saturated clay or in a high water table. The tank may collapse and its
contents will escape.
B. Tanks are not fire-resistant. Do not store them near an open flame or heat in excess of 180ºF.
C. Do not install any tank under the path of vehicles or heavy equipment.
D.
E.
F.
G. White cistern tanks and blue BRUISER tanks are made of resins that meet FDA specifications for the
storage of drinking water and can be used for that application. Yellow septic tanks and black septic
tanks must not be used for drinking water.
H. Protect the tank from sharp objects which could puncture it and cause leakage.
Norwesco advises against the use of a plastic underground tank for any other uses! Such uses would
void any Norwesco product warranty either stated or implied. In no event shall Norwesco be held liable
for any consequential damages.
WARRANTY
The Norwesco underground tanks, when installed in accordance to manufacturer’s instructions, are
warranted against defective materials and/or workmanship for a full three (3) years from date of
manufacture. Should a defect appear within the warranty period, Norwesco will supply a new, equivalent
tank in replacement thereof. Norwesco’s liability is limited to the value of the tank itself and specifically
excludes the cost of installation and/or removal and consequential damages.
UNDERGROUND TANK INSTALLATION INSTRUCTIONS
CAUTION
FAILURE TO COMPLY WITH THE POINTS BELOW VOIDS WARRANTY
NORWESCO INC.
4365 STEINER STREET
P.O. BOX 439
ST. BONIFACIUS, MN 55375-0439
TEL. [phone]
FAX [phone]
www.norwesco.com
NORWESCO INC.
4365 STEINER STREET
P.O. BOX 439
ST. BONIFACIUS, MN 55375-0439
TEL. [phone]
FAX [phone]
www.norwesco.com
P/N 63380
10/17
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EXCAVATION
WATER TANK CONNECTIONS
MANHOLE EXTENSIONS
BACKFILL MATERIALS
SEPTIC AND BRUISER TANK
INLET/OUTLET CONNECTIONS
A. Excavate to a depth that will provide
a minimum of 6” and a maximum of
30” of cover over the top of the tank.
This will avoid collapse and over-
expansion of the tank and possible
leakage.
B. Allow 18” to 24” on both sides and
both ends of the tank. Failure to
comply with allowance ranges could
cause tank collapse.
A. Install manhole extension before
you backfill.
B. Manhole extensions are supplied
with gaskets and screws. Re-use
the lid gasket and screws to attach
the lid at the top of the manhole
extension.
C. Note the direction of flow. The inlet
is higher than the outlet.
A. Install bulkhead fittings in either
side of manway or end rib as
shown.
B. Tank must be vented.
C. For water-tight seal, lid should
be sealed with silicone caulking.
Re-use stainless steel screws
supplied with lid.
The preferred material for backfill surrounding and covering
the tank is a sand/gravel mixture as described below. For blue
BRUISER tanks and white cistern tanks, native soil may be used
for backfill and those tanks may be left empty while backfilling.
For yellow and green septic tanks, the sand/gravel mixture is
required
and the tanks must be filled with water during the back-
filling process.BRUISER tanks and cistern tanks should be filled
one-fourth full after installation.
A. The sand/gravel mixture should be a mixture of sand
and gravel, 100% smaller than 1-1/2” and about
50% smaller than 1/4”.
B. All fill should be free of any wood, masonry debris, silt or clay.
A. Septic tanks 750 gal. and larger and
blue BRUISER tanks are supplied
with gaskets and tees or septic
adapters and tees. The PVC
adapter has two sockets for use
with either 4” Schedule 40 pipe,
or 4” SDR 35 Pipe.
B. Inlet and outlet piping should be
solvent welded to tees or adapters
using standard PVC cement.
C. 200, 300 and 500 spheres and 500 septic tanks do not come
with PVC tees & gaskets or PVC tees & adapters.
The preferred tank bedding material is well packed sand with
minimums of 6" in soil terrain and 12" in rock terrain. Native
soil can be used if it is flowable, compactable, rock free, and
can provide uniform tank support in the recessed rib areas.
The tank should be installed level.
C.
For septic installations, it is important to contact your local or state sanitarian regarding approved installation
procedures. Refer to SITE SELECTION/PREPARATION located on the Norwesco website. Water runoff caused by
sloping terrain, adjacent structures, or paved surfaces can be problematic if the site selection and installation are not
managed properly. Refer to SITE SELECTION/PREPARATION located on our website on the proper managing of
these issues. Failure to locate the tank site properly in areas of water runoff caused by sloping terrain adjacent
structures or paved surfaces, and/or not managing the installation properly can void the warranty.
If any size yellow septic tank or green 500 gallon septic tank is pumped for normal maintenance, it
should be refilled immediately. If a blue BRUISER tank or a white cistern tank is pumped empty, it
should be re-filled to one-forth of capacity. Spherical 200, 300 and 500 gallon tanks may be left
empty.
Norwesco yellow septic tanks, green 500 gallon septic tanks, black pump tanks, blue BRUISER
tanks and white cistern tanks are designed only for use as underground tanks.
Norwesco yellow septic tanks cannot be used as holdng tanks or pump tanks because the tank
may collapse if it is left empty underground. Blue BRUISER tanks, white cistern tanks, and 200,
300 or 500-gallon spherical tanks can be used for holding or pumping applications where permitted
by local codes.
A
C
B
A
A
5. BACKFILLING EXTERIOR
A. CAUTION: Fill tank with water as you
backfill,keeping water level even with
backfill level as you go to prevent
possible collapse.
B. Backfill with 12" layers and compact
each layer. ALWAYS COMPACT ENDS
FIRST.
C. Tamp and compact backfill under inlet and outlet pipes.
D. Maximum backfill over the top of the tank is 30”. Mound soil over
the top to provide positive drainage.