Septic Tank
1. Select site
•
Contact relevant authorities
before digging to locate all
underground cables and pipes
•
Determine the best location of the
tank taking into account existing
underground services, excavation
required, location of blackwater run and
heights into tank and outlet fall to drain.
•
Is the tank excavation hole far enough
away not to impact on foundations
and adjoining structures? Where
no regulations exist the distance of
the excavation from any structure
should be a minimum of 2 times
the depth of the excavation.
•
Consult with a Geotechnical Engineer
if you have any questions about
possible influence of excavation
on surrounding structures
•
Must not be installed where there is
a possibility of water table exceeding
half the height of the tank
2. Excavation
•
Excavate hole according to
dimensions of tank
•
Excavation slopes should be a
minimum of 30 degrees
•
Hole depth should be a minimum of 1675
below finished pavement / lawn level
•
Remove all loose soil from base of hole,
and add 100mm of sand or crusher
dust and compact to a firm level pad.
•
Be aware of the safe working practice
for working in excavated holes.
•
Hole dimensions at the base should
be a minimum of 200mm larger in
width and length of the tank.
Installation Guide
• ST3100
• ST4550
CHECK FIRST...
Read this manual thoroughly to ensure
all procedures are understood and
materials needed are available.
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