OVERVIEW TO THE CONSULTANT’S REPORT
In June, 2011, Council commissioned Dillon Consulting to undertake a preliminary design study
for the installation of a low-pressure sewer system in the Village of Dunnottar. Council has
changed the proposal to a low-pressure sewer system due to rising costs and the unwillingness of
the Provincial and Federal governments to provide grants for the gravity sewer.
Council received a first draft of the sewer system design study on November 07, 2011. As the
cost of the system had risen to $10.9 million from the estimated budget of $8 million, Council
requested Dillon review their estimates. On December 05, 2011, we received 2 revised cost
estimates for the project.
Estimate 1 - $10,205,651.00
This estimate is the original project design with the inclusion of refined per unit costs,
based on the average obtained from 3 contractors. Refining costs has reduced the project
estimate by $681,817.00.
Estimate 2 - $7,890,182.00
This estimate changed project design by allowing for a single forcemain rather than dual
(saving $271,890.00) and reduced municipal costs by shifting $1,700.00 per connection
to on-lot costs that ratepayers have to pay directly.
A dual forcemain has been recommended by the engineers to accommodate the seasonal volume
fluctuations and to reduce system maintenance costs.
For the purposes of all calculations and information, Council has opted to use Estimate 1.
If you have any questions, please send an email to email@example.com or call
389-4962. FAQs will be posted on the Village website.
WHAT IS PROPOSED
A Low Pressure Sewer System (Section 5 of the Consultant’s Report)
The low pressure sewer system (LPS) will be a new collection system for the entire Village and
will pump to Dunnottar’s sewage lagoon at the landfill site. The system can be divided into two
The municipal portion of the low pressure sewer system includes:
1. collection pipes to be installed between the edge of the road and the ditch and in many
cases in the backlanes depending on where the majority of the existing septic tanks are
2. curb stops installed for each property and connected to the main line;
3. one lift station to be placed on the Public Works yard on Whytewold Road;
4. dual forcemains for transportation of waste to the municipal lagoon.
A dual forcemain has been recommended to allow for the seasonal variation in usage. During
periods of high volume use (typically summer months) both forcemains would be utilized. In the
off-season, one of the mains would be shut down to help maintain self-cleaning velocities in the
mains and reduce maintenance requirements.
Information on payment options for the municipal portion will be sent out soon.
The on-lot portion of the low pressure sewer system (which is the direct responsibility of the
1. divided holding tank
2. effluent pump and electrical connection
3. discharge pipes (plumbing to connect the septic tank to the main sewer lines)
And would typically look like this:
On-Lot Costs (as estimated by Dillon Consulting January, 2012)
The total on-lot costs for each individual property owner will vary depending on how far your
septic tank is from your home and the property line, as well as whether or not you have a holding
tank, whether this is a divided tank, and if it is already connected to your residence.
As the costs will vary from property to property, we have obtained some estimates for the
installation of these services:
1. Divided Septic Tank
- Most residences in Dunnottar already have a divided septic tank in place. In the case of
a property that is not currently serviced, or where the tank is not divided, the cost will be
approximately $3,900.00 for installation of a septic tank.
2. Effluent Pump and Electrical Connection
- Council will purchase all the pumps required in the Village (to take advantage of bulk
purchasing power) and resell them to individuals at the net cost of approximately $1,050.00 per
- The estimated cost for connection to your existing electrical system is $500.00, plus an
additional $8.00 per foot for buried electrical service to your holding tank. It is suggested you
have your electrician evaluate your electrical service to ensure you have sufficient power for the
3. Discharge line from the septic tank to the curb stop
- The estimated cost for connections is $600.00, plus an additional $22.00 per foot for
pipe and installation.