MIL-HDBK-1138
trenches
of existing field.
Uneven grades
Table 2 (Continued)
Possible Causes of Failure
Possible Remedial Procedures
Poor soil conditions
Improve surface drainage;
High groundwater
install curtain drains; elevate
field; and/or reduce water
consumption.
Insufficient distance below
Elevate drain field and/or
drain field to bedrock
reduce water consumption.
Relatively impervious soils
Elevate drain field and/or
reduce water consumption.
Overload
Excessive wastewater loading Increase tank size or reduce
water consumption.
Poor stormwater drainage
Improve surface drainage.
away from system
Leaking plumbing fixtures
Repair plumbing fixtures.
Wastewater flow quantity
Remove garbage grinders;
and/or characteristics
increase drain field.
greater than anticipated in
design due to changes in use
of building, garbage
grinders, etc.
Lack of Tank Maintenance
Septic tanks not pumped out
Pump out tank; construct new
at sufficient intervals,
drain field on top of existing
causing solids to be
drain field; relieve drain field
discharged to drain field
by draining into a pit and
pumping out and let field rest
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