Current
guidelines/standards recommend that septic tanks should be
pumped every 2-3 years. Why do you say that your design
cycle is 12 years and you recommend a 7-10 clean-out cycle?
The
12 year design for clean-out is based on data established by
the US Public Health Service with a 95% confidence interval and
the average number of residents per household (1), and a Brooklin
Concrete 4,500L tank. This means that there is a 95% chance that
the sludge accumulated in the tank will be below that calculated
value. In situations
where the number of users greatly exceeds the average, the
users may be required to perform clean-outs more frequently
or may prefer to use a larger sized tank. Clean-outs
are desirable when the scum level and sludge level is within
10 and 30 cms of the wastewater transfer points, respectively.
(1) Statistics Canada, Private households by structural type of dwelling,
by prvince and territory (2001 Census), for Single Detached House, Canadian average,
2.9 persons per household
|
| If the municipality
is responsible for maintaining my clarifier is there an
easement to get access to my tank/laterals? |
| What if my jurisdiction
does not have established easements? |
| My existing
septic tank is under my deck and my backyard is too small
for another tank. How are you going to install your
tank? Decommission the old one? |
| We have a high
water table. Will your tanks stay submerged? |
| Traditionally
municipal guidelines have the sewer systems in the middle
of the road. Do you require amendments to these guidelines?
If so, to what standard? |
| If the pipe
did clog, how would you find and remove the blockage? |
| How can a 3" pipe
carry the effluent for 300 homes? |
| If we expand
beyond the service area of the area under EA, are we limited
to using SBS™? |
| If you encounter
bedrock, isn't the cost of installing 3" pipe versus
historic pipe almost the same? |
| Does your
system limit wastewater treatment options? |
| If you build
a treatment plant to only perform secondary and tertiary
treatment, what do you do with the septage from the tank? |
| Does your
clarifier produce septage that is worse in any way than
standard septage? |
| We would prefer
not to deal with the sludge through periodic pumping. Is
it better to transport it daily via the historic system
or by a pressurized grinder/vacuum pump system? |
| Will your
sewer system meet our local standards for procurement and
maintenance? What if we don't have a standard? |
| Is your system
approved in Ontario? |
