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Perc & Mantle
What is a Perc and Mantle?
Mantle
Soil test pits or soil mantles are excavations done with a backhoe to
verify effective soil depth. Effective soil is considered soil that will
treat or filter sewage. For a standard sewage disposal system (in our
counties) a minimum 6 feet of effective soil is required, 4 feet of
effective soil below the trench bottom. The standard trench depth is
24-inches.
Perc
Percolation test are used to determine how fast or slow water will
filter through the soil. A perc hole is dug to the anticipated trench
bottom or to the limiting horizon. The hole is pre-soaked to simulate
winter time or wet weather conditions. Readings of how quickly water
leaves this hole are taken the following day. These reading are then
averaged to calculate your average percolation rate.
Process To Install The Average Septic System in
Nevada County
| Time Completed |
Description |
Anticipated Cost |
| 1-3 days |
Give check to Navo & Sons Inc. made out to
Nevada County Environmental Health Dept. (N.C.E.H.D)
for us to schedule the Perc & Mantle (P&M) (see below) |
$0.00 |
| 3-5 weeks |
To schedule the P&M the County has a fee of |
$505.62 |
| 5-7 days |
The County supervises Navo & Sons Inc (ie designer,
backhoe, and operator) performing the P& M
Please note: It is recommended to have owners or
owners representative present on this first day |
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| 5-7 days |
Because we are one stop shop we provide the backhoe,
operator, designer for 2 mantles and 3 perc test - (A Standard P &
M).
The designer will complete the P & M paperwork. |
$1250.00 |
| variable |
If a design is needed:
The designer will quote a firm price to perform the
specific design and time to complete said design
Please note:
Upon approval and completion of the design
we can provide a firm installation cost for the system |
variable |
| 4-6 weeks |
Once the design is completed, the 2 design originals
will need to be taken to N.C.E.H.D. to apply for the
installation permit of system |
$650.00 + |
| 1-3 weeks |
Once a permit is issued Navo & Sons Inc. can
usually start installing the system. |
Depends on type of system |
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