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Conceptual Septic System Design
Conceptual Development
6690 Mitch Owens Road
Ottawa, Ontario
Houle Chevrier Engineering Ltd. • 32 Steacie Drive • Ottawa, Ontario • K2K 2A9 • www.hceng.ca
Submitted to:
1343487 Ontario Ltd.
1718 Lakeshore Drive
Ottawa, ON
K4P 1H1
Conceptual Septic System Design
Conceptual Development
6690 Mitch Owens Road
Ottawa, Ontario
October 11, 2016
Project: 64459.01
Report to: 1343487 Ontario Ltd. Project: 64459.01 (October 11, 2016)
ii
TABLE OF CONTENTS
1.0 INTRODUCTION ................................................................................................................ 1
2.0 SEPTIC SYSTEM DESIGN ................................................................................................ 2
2.1 Daily Design Sewage Flow .......................................................................................... 2
2.2 Septic System Design Details ...................................................................................... 2
2.2.1 Type A Leaching Bed ............................................................................................ 2
2.2.2 Septic Tanks ......................................................................................................... 3
2.2.3 Pumps/Controls .................................................................................................... 3
2.2.4 Flow Balancing ..................................................................................................... 3
2.2.5 Tertiary Treatment ................................................................................................ 4
3.0 LIMITATIONS OF THIS REPORT ...................................................................................... 4
LIST OF FIGURES
Figure 1....................................................................................... Conceptual Septic System Plan
Table 1 .......................... Daily Design Sanitary Sewage Flow Based on Conceptual Occupancies
LIST OF APPENDICES
Appendix A
Appendix B
Concept Plan 2
Preliminary Geotechnical Investigation Report
Report to: 1343487 Ontario Ltd. Project: 64459.01 (October 11, 2016)
1
1.0 INTRODUCTION
It is understood that a rezoning of the existing property known as 6690 Mitch Owens in Ottawa,
Ontario, is being proposed. In order to obtain the proposed rezoning, a conceptual
development plan has been prepared by Lloyd Phillips & Associates Ltd.
A conceptual septic system design is required in order to demonstrate that a system can be
installed on the subject site in conjunction with the proposed layout plan.
In consideration of the above, our firm has been retained to prepare a conceptual septic system
design. The details of the conceptual system are provided in the following sections and on
Figure 1.
Report to: 1343487 Ontario Ltd. Project: 64459.01 (October 11, 2016)
2
2.0 SEPTIC SYSTEM DESIGN
2.1 Daily Design Sewage Flow
The conceptual septic system design provided in this report, includes conceptual details
pertaining to buildings and potential occupants, based on the conceptual site plan prepared by
Lloyd Phillips & Associates Ltd. (see Appendix A).
The Ontario Building Code (OBC) provides information regarding the daily design sanitary
sewage flows (DDSSF) for various site uses. Where multiple occupancy types will be present in
a building, the resulting DDSSFs must be combined for the total DDSSF for the building.
Based on the information provided to our firm, conceptual DDSSFs have been established for
each building and its assumed occupancies (see Table 1), where applicable. Also where
applicable, a breakdown of multiple occupancies for each building is included, such as office
space and 'factory' type area. The maximum unit values provided on Table 1 have been
arbitrarily estimated. Any adjustments to these figures will result in a change in the DDSSF, and
possibly an exceedance of 10,000 litres per day.
It is understood that the total DDSSF for the development is to be kept below 10,000 litres. As
such, conceptual, maximum unit numbers (i.e. office area, employee numbers, ...etc.) for each
occupancy and building are provided in Table 1. The resulting, conceptual DDSSF is 9,994
litres.
Based on details provided to our office, it is understood that the proposed septic system will
receive sewage flow solely from standard plumbing fixtures typical of the noted establishments.
2.2 Septic System Design Details
Based on the information provided in a preliminary geotechnical investigation carried out by
others (see report in Appendix B), the subsurface conditions at the subject site consist of topsoil
over sandy soil with groundwater at or within 150 millimetres of ground surface. It is noted that
groundwater levels will fluctuate seasonally and following precipitation events.
Given the subsurface conditions and the available space, a Class 4 Type 'A' style bed is
proposed (see Figure 1).
2.2.1 Type A Leaching Bed
2.2.1.1 Sand Area
The minimum total sand area for the leaching bed is determined as follows:
A = (Q x T)/400, where
A = min. area of contact between imported sand and underlying soil (m2)
Report to: 1343487 Ontario Ltd. Project: 64459.01 (October 11, 2016)
3
Q = Daily Design Sanitary Sewage Flow (9,994 litres)
T = Percolation time (‘T’) of underlying soil. (estimated 20 min/cm, for silty sand
subgrade)
A = (9,994 x 20)/400 = 500 m2
2.2.1.2 Stone Area
The minimum stone area is determined as follows:
A = Q/50, where
A = Minimum stone area (m2)
Q = Daily Design Sanitary Sewage Flow (9,994 litres for conceptual design)
A = 9,994/50 = 200 m2
2.2.2 Septic Tanks
The OBC stipulates that the minimum septic tank operating volume for a commercial occupancy
is three (3) times the DDSSF or 3,600 litres, whichever is the greater volume. As such, the
minimum required operating volume of the septic tank(s) is 29,982 litres. For the purposes of
the conceptual development, this could include one (or more) centralized tanks or individual
tanks located at each of the buildings, in which case the dedicated tanks should be sized based
on the DDSSF for the buildings it will serve. Either option is considered feasible for the purpose
of this conceptual design.
2.2.3 Pumps/Controls
Further to the above, in either case, be it central or dedicated septic tank locations, pumps will
likely be required to transport sewage from the source buildings to the septic system. The pump
chamber(s) will have to be sized to accommodate the DDSSF for the building(s) it will serve.
2.2.4 Flow Balancing
Given that the conceptual development is commercial, sewage flow will occur mainly during
daytime business hours, and possibly at concentrated times during an average workday. As
such, it is recommended that flow balancing measures be implemented into the design of the
septic system. Typically, such measures include the installation of a balancing tank(s) within
which effluent accumulates during the workday, and from which effluent is pumped at an
established and equal rate (i.e. pre-determined volume on an hourly basis) so that the dispersal
of effluent to the septic system occurs over a 24 hour period. This approach ensures that the
septic system does not receive large surges of effluent sporadically, but rather smaller volumes
over equally spaced timeframes. This approach will help alleviate the likelihood of system
failure due to overloading, as well as prolonging the lifespan of the system.
Report to: 1343487 Ontario Ltd. Project: 64459.01 (October 11, 2016)
4
2.2.5 Tertiary Treatment
As stated, the conceptual septic system consists of a Class 4 Type 'A' leaching bed. As
stipulated in the OBC, effluent being dispersed to this type of bed must be pre-treated to the
criteria provided under Level IV in Table 8.6.2.2 of the OBC. Several proprietary treatment units
are available and approved for use under the OBC for this purpose.
At the time of final design, consideration should be given to the specific benefits each treatment
system will offer given the particulars of the development. These may include availability,
performance history, upfront cost, maintenance requirements, operating costs, availability of
servicing contractors, warranties, ...etc.
3.0 LIMITATIONS OF THIS REPORT
As stated, the details provided herein are based on conceptual details provided to our firm. The
purpose of this document is to demonstrate that a compliant septic system can be installed at
the subject site in consideration of the conceptual development details.
The final design details for the septic system may vary from those provided herein.
We trust this report provides sufficient information for your present purposes. If you have any
questions concerning this report, please do not hesitate to contact our office.
Matthew Rainville, C.E.T. Senior Technologist P:\0. Files\64400\64459.01\Septic Terrain Analysis\64459.01_RPT01_V01_2016-10-11.docx
1. ALL WORKS TO BE COMPLETED IN ACCORDANCE WITH MUNICIPAL,
PROVINCIAL, AND LOCAL AUTHORITY STANDARDS AND REGULATIONS
WHERE APPLICABLE, AND IN ACCORDANCE WITH ACCEPTED INDUSTRY
BEST PRACTICE.
2. INFORMATION PROVIDED ON THE PLAN IS BASED ON INFORMATION
REASONABLY AVAILABLE AND/OR PROVIDED TO HOULE CHEVRIER
ENGINEERING LTD AT THE TIME OF DESIGN. THE CONTRACTOR/OWNER
IS TO VERIFY THE ACCURACY OF THE INFORMATION CONTAINED HEREIN
REGARDING, BUT NOT LIMITED TO, ELEVATIONS, DIMENSIONS,
SETBACKS, EASEMENTS, UTILITY LOCATIONS AND DETAILS, ...ETC., AND
REPORT ANY ERRORS OR OMISSIONS TO HOULE CHEVRIER
ENGINEERING LTD.
3. THE LOCATION OF ALL OVERHEAD AND UNDERGROUND UTILITIES MAY
NOT BE DISPLAYED ON THIS PLAN AND, WHERE SHOWN, THEIR
POSITIONS MAY NOT BE ACCURATE. IT IS THE RESPONSIBILITY OF THE
OWNER/CONTRACTOR TO LOCATE SUCH UTILITIES PRIOR TO
COMMENCING WORKS. HOULE CHEVRIER ENGINEERING LTD. DOES NOT
ASSUME LIABILITY FOR DAMAGE TO SERVICES, UTILITIES, AND
STRUCTURES DURING CONSTRUCTION OPERATIONS.
4. IT IS THE RESPONSIBILITY OF THE OWNER/CONTRACTOR TO ENSURE THAT
THE PLAN USED FOR CONSTRUCTION IS AN APPROVED AND LATEST
VERSION.
5. DIMENSIONS AND ELEVATIONS DISPLAYED ON THIS PLAN ARE IN METRES.
THIS IS NOT A PLAN OF SURVEY. THIS PLAN IS NOT TO BE SCALED,
ALTERED OR REPRODUCED AND IS INTENDED FOR USE ONLY IN RELATION
TO THE PROJECT FOR WHICH IT WAS PREPARED.
6. THIS PLAN SHOULD BE USED IN CONJUNCTION WITH RELEVANT
DOCUMENTS, PLANS, AND DETAILS PREPARED BY HOULE CHEVRIER
ENGINEERING LTD.
7. THE CONCEPTUAL SEPTIC SYSTEM DESIGN AS PREPARED BY HOULE
CHEVRIER ENGINEERING LTD. MEETS ALL ONTARIO BUILDING CODE
REQUIREMENTS AND MANUFACTURER SPECIFICATIONS IN EFFECT AT
THE TIME THE DESIGN WAS PREPARED.
0 40 80
1:2000
120m
Rev.
Chkd by
Location
Scale
Date
ProjectClient
Houle Chevrier Engineering Ltd.
32 Steacie Drive
Ottawa, ON
Tel: (613) 836-1422
www.hceng.ca
ottawa@hceng.ca
NOTES
Drwn by
64459.01
FIGURE 1
MR AFC
OCT 11, 2016
0
REVISION DATE DESCRIPTION
0 10/11/2016 PLANS ISSUED TO CLIENT.
6690 MITCH OWENS RD., OTTAWA, ON
LOUIS DIRAIMO
CONCEPTUAL SEPTIC
SYSTEM PLAN
M
I
T
C
H
O
W
E
N
S
R
O
A
D
B1
POTENTIAL LOCATION
FOR TREATMENT UNITS,
BALANCING TANKS, AND
SEPTIC TANKS (where
required)
CONCEPTUAL 25 x 20 METRES TYPE
'A' LEACHING BED
(Fully Raised 1.2 metres above ground)
PROPOSED ELEVATION UNDERSIDE OF FOOTING
LEGEND
POTENTIAL LOCATION OF SEWAGE PIPE
PROPOSED BUILDING (refer to Concept Plan 2, appendix A)
A
B2
C
D3
D2
D1
D4
D5
D
2
P:\0. Files\64400\64459.01\Septic Terrain Analysis\64459.01_FG01_V01_2016-10-11.dwg, Conceptual Septic Plan, 10/11/2016 12:28:32 PM
TABLE 1 October 11, 2016
Our ref.: 64459.01
Unit No. Conceptual Occupant
Determining Unit
Type for Primary
Occupancy
Maximum No. of
UnitsResulting DDSF1 from
Primary Occupancy
Determining Unit Type
for Secondary
Occupancy
Maximum No. of
unitsResulting DDSF1 from
Secondary OccupancyTotal DDSF
1 for Unit
2
ARestaurant (paper
service only)Seats 30 1800.0 0 1800.0
B2 Service GarageMax. Employees in
Service Area10 750.0 0 750.0
B1 Auto Dealership Office Area (m2) 415 3311.2Max. Employees in
Service/Other Areas15 1125 4436.2
CMulti-Tenant Light
IndustrialOffice Area (m
2) 105 846.8
Max. Employees in
Factory/Other Areas10 750 1596.8
D1Office for Storage
FacilityOffice Area (m2) 175 1411.3 0 1411.3
0.0 0 0.0
TOTAL 8119.2 1875 9994.2
1 The Daily Design Sewage Flow (DDSF) in litres per day is determined based on provisions within the Ontario Building Code 2012.
2 Where multiple occupancies are within an establishment, the combined DDSF of those occupancies must be utilized.
DAILY DESIGN SANITARY SEWAGE FLOW BASED ON CONCEPTUAL OCCUPANCIES
6690 Mitch Owens Road
Page 1 of 1
Report to: 1343487 Ontario Ltd. Project: 64459.01 (October 11, 2016)
APPENDIX A
Concept Plan 2
by Lloyd Phillips & Associates Ltd.
C o n c e p t P l a n 2
Project: Re-zoningProperty: 6690 Mitch Owens RoadClient: 1343487 Ontario Inc.File No.: 1622Date: September 14, 2016
Mitch Owens RdAlbion RdSUBJECT SITE
Bank St
Leitrim Rd
30m
30m
14m
50m
15m
14 m
12m
7 m
14m
39m 20m
7m7m 7m
15m
35m
50m
20m
12m
65m
A
B1
C
D1
B2
D2
Refuse Storage72 m² (775 ft²)
Asphalt10,896 m² (117,283 ft²)
Septic Field2,000 m² (21,527 ft²)
Gravel19,880 m² (213,986 ft²)
A -1 Storey | 1 Unit-Floorplate: 360 m² (3,875 ft²)-Use: Restaurant
B1-1 Storey | 1 Unit-Floorplate: 4,150 m² (44,670 ft²)-Use: RV, Automobile, ATV or Heavy Equipment dealership (sales, rental, and service)
B2- 1 Storey | 1 Unit-Floorplate: 525 m² (5,651 ft²)-Use: Service garage, and/or storage for B1
C-1 Storey | Multi-Unit-Floorplate: 1,050 m² (11,302 ft²)-Uses: Light Industrial and/or Retail Store
D1-1 Storey | 1 Unit-Floorplate: 200 m² (2,152 ft²)-Use: Self-storage (front office)
D2- 1 Storey | 4 Units-Floorplate: 600 m² (6,458 ft²)-Use: Self-storage (storage units)
D3-1 Storey | 4 Units-Floorplate: 780 m² (8,395 ft²)-Use: Self-storage (storage units)
D4 & D5-Use: Self-storage (outdoor storage)-Area: 2,822 m² (30,375 ft²)
SepticField
D3
NN
Vista Patrick Private
Proposed Private Roads
ALB
ION
RO
AD
MITCH OWENS ROAD
GREELY10
m
70 m
10m
55 m
50 m
7 m
50 m
15 m
20 m
35 m
15 m
370 m
192
m
40 m
24m
50m
46m
7 m
12m
5m
D4
D5
SWM
7 m 5m
5 m12 m
13m
40 m
7m
11 m
5 m
5 m
6m
3m
Commercial / Light Industrial11,805 m² (127,067 ft²)
Vegetation25,881 m² (278,580 ft²)
Storm Water898 m² (9,665 ft²)
*Dimensions are approximate and not subject to a Legal Survey
ROW (34 m)ROW (34 m) ROW (34 m)
12m
9 m
Report to: 1343487 Ontario Ltd. Project: 64459.01 (October 11, 2016)
APPENDIX B
Preliminary Geotechnical Investigation Report
by J.D. Paterson and Associates Ltd., April 7, 1999
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