D. B. G R A Y E N G I N E E R I N G I N C. Stormwater Management - Grading & Drainage - Storm & Sanitary Sewers - Watermains

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1 SERVICING BRIEF 1003 Prince of Wales Drive Ottawa, Ontario Report No SB May 7, 2013 Revised March 3, 2014 D. B. G R A Y E N G I N E E R I N G I N C. Stormwater Management - Grading & Drainage - Storm & Sanitary Sewers - Watermains 700 Long Point Circle Ottawa, Ontario K1T 4E9 dbgray@rogers.com 1

2 SERVICING BRIEF 1003 Prince of Wales Drive Ottawa, Ontario The following Servicing Brief is a description of the services for a proposed seven lot residential development consisting of detached houses. It will be a freehold development with common elements located on 2178 sq.m. of land at 1003 Prince of Wales Drive in Ottawa. Since a freehold development with common elements is proposed it is expected that a joint use and maintenance agreement will be required. The agreement is expected to include shared infrastructure including the on-site storm and sanitary sewer system and watermain. Since the proposed services are crossing more than one property (i.e. the common elements) (and because a new stormwater outlet is proposed) it is expected that a Ministry of Environment Environmental Compliance Approval (ECA) will be required. Refer to drawing SG-1, SG-2, SS-1 and SS-2, prepared by D. B. Gray Engineering Inc. Water Supply for Fire Fighting: There is an existing fire hydrant in the municipal right-of-way in front of the proposed development located between 33 m and 90 m from the front of the proposed houses. A proposed 150mm watermain will supply an on-site fire hydrant near the end proposed private road. It will be located between 15 m and 45 m from the front of the proposed houses. A fire demand of 45 l/s (2,700 L/min) at 138 kpa is required as per "Required Minimum Water Supply Flow Rate" as calculated using the Ontario Building Code - Appendix A - Article A "Water Supply For Fire Fighting". Therefore, with a maximum daily demand of 0.8 l/s (see below under Water Service) the Max. Day + Fire Flow demand is 45.8 l/s. Based on computer model simulation of the boundary conditions received from the city, the HGL during 45.8 l/s fire flow conditions is m which calculates to be 329 kpa (48 psi). Since the pressure is above 138 kpa (20 psi) there is an adequate water supply for fire fighting. Water Service: The existing dwelling is serviced by a well. The well will be abandoned and decommissioned in accordance with Ministry of the Environment (MOE) regulation 903 by a licensed well contractor. The proposed 150 mm private watermain will connect to an existing 200mm municipal watermain in the Prince of Wales Drive right-of-way. Based on the City of Ottawa and Ministry of the Environment Design Guidelines the daily average flow is 0.08 l/s with a maximum daily and maximum hourly demand of 0.79 and 1.18 l/s respectively. Based on computer model simulation of the boundary conditions received from the city, the minimum HGL (hydraulic grade line) is m and the maximum is m. With these HGLs the water pressure is calculated to vary from 456 kpa to 522 kpa (68 to 88 psi). The minimum pressure is acceptable for the proposed development. Since the 2

3 water pressure can be above 80 psi at times it is recommended that pressure reducing valves be installed immediately downstream of the water meters. Sanitary Service: The existing dwelling is serviced by a septic system. The septic system will be decommissioned to the satisfaction of the director of the Ottawa Septic System Office (OSSO). The septic tank shall be pumped out and emptied by a registered sewage hauler prior to decommissioning. The septic tank shall be left in the ground and backfilled with sand or gravel or the septic tanks shall be removed from the site and disposed of at a licensed facility. Electrical devices containing mercury shall be removed and disposed of in a licensed hazardous waste disposal facility. The septic system leaching bed shall be disconnected from the septic tank and can be left in the ground unless the leaching bed is excavated as part of the site development, in which case the distribution pipes shall be disposed at a licensed waste disposal site. Excavated contaminated soil shall be spread or stockpiled on site to the satisfaction of the OSSO or disposed of in a licensed waste disposal site. Based on the City of Ottawa Sewer Design Guidelines for a residential development (7 detached dwelling units 3.4 persons per unit 350 l/person/day 4.0 peaking factor); and a 0.24 l/s/ha infiltration flow; the post development flow is calculated to be 0.45 l/s. This flow will be adequately handled by the proposed 200mm sanitary sewers which range from 0.65% slope (11.9 l/s capacity) to 6.0% slope (83.8 l/s capacity). The proposed sanitary service will connect to an existing municipal sanitary sewer at a manhole located approximately 4 m from the south-east corner of the property in the lands adjacent to the canal. The existing municipal sanitary sewer connects to the 1050 mm Mooney s Bay Collector sewer located in the lands adjacent to the canal. The existing municipal sanitary sewer currently serves 6 detached dwellings. The total flow from the 13 existing and proposed detached dwelling is calculated to be 0.87 l/s. This flow will be adequately handled by the existing 250mm municipal sanitary sewers with a 4.8% slope (135.9 l/s capacity) and 15% slope (240.3 l/s capacity). The 0.45 l/s increase in sanitary flows is expected to have a negligible impact on the collector. Stormwater: The stormwater quantity control measures required for this site are based on the criteria that the release rate for post-development storm events is equal to or less than the flow produced by the pre-development conditions. (See Stormwater Management Report No SWM, prepared by D. B. Gray Engineering Inc.) The unrestricted flowrate resulting from one in five year storm event will produce a peak flow of 30.6 l/s which will be adequately handled by a proposed storm sewer ( % l/s capacity). However an inlet control device (ICD) located at the outlet pipe of an on-site manhole will restrict the flow and force the stormwater to back up into an on-site depressed grassed area (the stormwater detention area). Stormwater released through the (ICD) will be restricted to the maximum flow of 9.1 l/s during the 1:5 year storm event. Stormwater will be controlled by an inlet control device and a weir to 18.5 l/s during the 1:100 year event. The controlled flow will drain to a swale behind a 24 m wide grassed level spreader which will evenly distribute the flow across the 55 m of wooded and grassed lands between the subject property and the Rideau Canal. 3

4 Conclusions: 1. There is an adequate water supply for fire fighting. 2. The existing water pressure is adequate for the proposed development. 3. Since it is estimated that the water pressure can be above 80 psi at times it is recommended that pressure reducing valves be installed. 4. The proposed private watermain is adequately sized to serve the development. 5. The expected sanitary sewage flow will be adequately handled by the proposed sanitary sewers. 6. The increase in sanitary flows contributing to the existing 1050mm Mooney s Bay Collector is expected to have a negligible impact. 7. The size and slope of the existing sanitary sewer connecting to the collector is not known and will require further investigation. 8. The stormwater quantity control is based on the criteria that the release rate for postdevelopment storm events is equal to or less than the flow produced by the existing conditions. 9. The unrestricted flowrate produced by a one in five year storm event will be adequately handled by a proposed storm sewer. 10. It is expected that a Ministry of Environment Environmental Compliance Certificate (ECA) will be required because the proposed services cross more than one property and because a new stormwater outlet is proposed. 11. Since a freehold development with common elements is proposed it is expected that a joint use and maintenance agreement will be required. 4

5 15-Apr Prince of Wales Drive Ottawa, Ontario Water Supply for Fire-Fighting Calculations: A fire demand of 2,700 L/min (45 l/s) is required as per "Required Minimum Water Supply Flow Rate" as calculated using the Ontario Building Code - Appendix A - Article A "Water Supply For Fire Fighting". Fire Protection Water Supply Q = KVS Tot S Tot = S Side1 + S Side2 + S Side3 + S Side1 + S Side4 Spatial Coefficient Exposure Distance m S Side (to north property line) S Side (to east property line) S Side (to south property line) S Side (to west property line) S Tot maximum K (Water Supply Coefficient) 23 As per A Table 1 (Group C Occupancy / Combustible construction with floor assembly fire separations but no fire resistance ratings as per OBC ) V (Building Volume) Average Area Height Volume sq.m. m cu.m. Attic nd Floor: st Floor: Basement: Garage: Q = Q = KVS Tot 43,611 L 948 cu.m. Required Minimum Water Supply Flow Rate 2,700 L/min 45 L/sec (As per A Table 2) 5

6 15-Apr Prince of Wales Drive Ottawa, Ontario Water Demand Number of Units Persons Per Unit Population UNIT TYPE: Single Family: DAILY AVERAGE 350 litres / person / day 5.0 l / min 0.08 l / sec 1.3 Usgpm MAXIMUM DAILY DEMAND 9.5 (Peaking Factor for a equivalent population of 20: Table 3-3 MOE Design Guidelines for Drinking-Water Systems) 47.1 l / min 0.79 l / sec 12.4 Usgpm MAXIMUM HOURLY DEMAND 14.3 (Peaking Factor for a equivalent population of 20: Table 3-3 MOE Design Guidelines for Drinking-Water Systems) 70.9 l / min 1.18 l / sec 18.7 Usgpm 6

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9 E 9 2W H002 H004 R MO NG NI D SI A EL NE GR E H008 O CE 1967-CI-203 MORLEY BLVD ILD P RIV H005 H013 H054 RD H055 H007 P016 COLONEL BY DR E AV H056 D N H052 RYLA -152 I MA 3-D 7 19 P113 H053 HERON RE S H009 P017 EN VA LLE YC RIDEA UVIEW TER DI-1 52 H W P025 RD IV ER S IT Y UN I D FAIR CH H050 TURN LANE ANE TURN L H010 PR IN H011 D ILL AVE R H003 H012 FOREST H E H001 IN L 1959-CI-152 SE 03 BA 2 I -D I C 59 H E AV S H038 RE RE H046 I C H A LS LL WI VI H049 H E H039 V H047 DA H048 E R V O A F AN ER H035 S 196 DL H040 N 2-C A H I-2 C 03 ON GT N I LEX R TE H079 U B I L MA H O 03 I-2 C U C MC N LA Y OE NE LA 1959-CI-203 R FW A LE SD H AS -D 1973 I I-1 C 0- ST AVE ER H FIS TURN LANE 2C

10 MAX DAY + FIRE FLOW: 45.8 l/s NODE 4 MAX DAY DOMESTIC DEMAND 0.3 l/s 1 RESERVOIR: HGL m NODE 3: FIRE HYDRANT 45.0 l/s EPANET 2 PIPE 3: 150mm PIPE 1 150mm PIPE 2: 150mm NODE 2: MAX DAY DOMESTIC DEMAND 0.5 l/s 10

11 EPANET 2 MAX HOURLY DOMESTIC DEMAND: 1.2 l/s NODE 4 MAX HOURLY DOMESTIC DEMAND 0.5 l/s 1 RESERVOIR: HGL 125.5m NODE 3: FIRE HYDRANT 0.0 l/s PIPE 3: 150mm PIPE 1 150mm PIPE 2: 150mm NODE 2: MAX HOURLY DOMESTIC DEMAND 0.7 l/s 11

12 15-Apr Prince of Wales Drive Ottawa, Ontario HIGH PRESSURE CHECK - MAX HGL:135.5 Elevation Head Pressure m m m psi kpa Road Lot Lot EPANET HYDRAULIC MODELLING RESULTS MAX DAY + FIRE FLOW: 45.8 l/s - HGL: Node ID Demand Head Elevation Pressure l/s m m m psi kpa 1 Reservoir Domestic Demand Fire Hydrant Domestic Demand Link ID Diameter Length Loss Flow Velocity Roughness mm m Coeff. l/s m/s Pipe Pipe Pipe MAX HOURLY DEMAND: 1.2 l/s - MIN HGL : Node ID Demand Head Elevation Pressure l/s m m m psi kpa 1 Reservoir Domestic Demand Fire Hydrant Domestic Demand Link ID Diameter Length Loss Flow Velocity Roughness mm m Coeff. l/s m/s Pipe Pipe Pipe

13 D. B. G R A Y E N G I N E E R I N G I N C. SANITARY SEWER DESIGN FORM Average Daily Flows: Peaking Factor: PROJECT: 1003 Prince of Wales Dr, Ottawa Residential: 350 l / capita / day Residential (Harmon Equation): P.F. = Stormwater Management - Grading & Drainage - Storm & Sanitary Sewers - Watermains COMMENTS 1052 Karsh Drive Tel: (613) Commercial: 50,000 l / ha / day P = Population / P 0.5 Designed By: DBG Ottawa, Ontario. Fax: (613) Instituational: 50,000 l / ha / day K1G 4N1 dbgray@rogers.com Light Industrial: 35,000 l / ha / day Infiltration Allowance: 0.28 l / s / ha 3-Mar-14 Heavy Industrial: 55,000 l / ha / day Page: 1 of 1 Section Cumulative Section Cumulative SEWER DATA LOCATION Single Semi / Duplex / Apartments Apartments Apartments Apartments Residential Non-Residential Infiltration Residential Sewage Total Family Townhouse Triplex (average) (1 Bed.) (2 Bed.) (3 Bed.) n = Peaking Area STREET FROM TO ppu = 3.4 ppu = 2.7 ppu = 2.3 ppu = 1.8 ppu = 1.4 ppu = 2.1 ppu = 3.1 Area Pop. Peaking Area Flow Flow Flow Flow Type of Dia. Actual Dia. Nom. Slope Length Capacity Velocity Ratio Factor Factor No. of Units No. of Units No. of Units No. of Units No. of Units No. of Units No. of Units ha ha l/ha/day ha l/s l/s l/s Pipe (mm) (mm) (%) (m) (l/s) (m/s) Q/Qfull MH-SA.1 MH-SA PVC SDR EXISTING MUNICIPAL SANITARY SEWERS 4 MH-SA.2 MH-SA PVC SDR MH-SA.4 MH-SA PVC SDR MH-SA.3 MH-SA PVC SDR MH-SA.5 MH-SA.B PVC SDR MH-SA.B MH-SA.C MH-SA.C MOONEY'S BAY COLLECTOR 13

14 D. B. G R A Y E N G I N E E R I N G I N C. COMMENTS Stormwater Management - Grading & Drainage - Storm & Sanitary Sewers - Watermains STORM SEWER COMPUTATION FORM PROJECT: 1003 Prince of Wales, Ottawa 1052 Karsh Drive Tel: (613) RATIONAL METHOD Q = 2.78 A I R FIVE YEAR EVENT Designed By: DBG Ottawa, Ontario. Fax: (613) K1G 4N1 dbgray@rogers.com n = Date: 15-Apr-13 Page: 1 of 1 Time of Rainfall SEWER DATA LOCATION AREA (ha) Individual Accum. Peak Flow Conc. Intensity Type of Dia. Actual Dia. Nom. Slope Length Capacity Velocity Time of Ratio 2.78 A R 2.78 A R Q (l/s) STREET FROM TO R = 0.9 R = 0.70 R = 0.2 R = 0.9 (min) I (mm/hr) Pipe (mm) (mm) (%) (m) (l/s) (m/s) Flow (min) Q/Qfull CB/MH-1 CB/MH PVC SDR CB/MH-2 CB/MH PVC SDR CB/MH-3 CB/MH PVC SDR MH-5 CB/MH PVC SDR CB/MH-4 open end PVC SDR

15 APPENDIX A Comments from RVCA, NCC and Parks Canada 15

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18 NATIONAL CAPITAL COMMISSION/COMMISSION DE LA CAPITALE NATIONALE CAPITAL PLANNING AND ENVIRONMENTAL MANAGEMENT / AMÉNAGEMENT DE LA CAPITALE ET GESTION DE L ENVIRONEMENT 8 th floor / 8 ième étage Comment Sheet / Feuille de commentaires To / Destinataire: Melissa Jort-Conway City of Ottawa Date: 27 August 2013 Subject/Objet: Site Plan proposal (PUD) 7 detached low rise residential From / Expéditeur: Sandra Candow, MCIP, RPP Principal Planner/Planificatrice principale ext 5586 File No./ No de dossier: D NCC file CP Address/ adresse: 1003 Prince of Wales Drive (at Rideau Canal) ( between Heron Road and the Central Experimental Farm /Arboretum) Please confirm via sandra.candow@ncc-ccn.ca that you have received these comments. Thank you for circulating the above noted application for Site Plan Approval for a proposed Planned Unit Development (PUD) containing 7 detached residential dwellings with a shared ROW access extending eastwards from Prince of Wales Drive, (individual ownerships to be done by severance following site plan approval). We note that this site abuts federal lands on the north and east sides, is across the street from the Central Experimental Farm (designated a National Historic Site), fronts on a scenic capital arrival and cultural landscape (Prince of Wales Drive), and is within the view shed of the UNESCO Rideau Canal. The Central Experimental Farm is also home to the Canada Agriculture Museum, the Arboretum, ornamental gardens and the Fletcher Wildlife Centre. These federal lands are designated as National Interest Land Mass (NILM) lands. The NCC has an interest in this application with regards to the proximity of this development to Capital interests. This includes NCC land holdings and the interests of our federal partners at Parks Canada and Agriculture Canada. These are lands in the Capital region that are deemed to be of national importance based on their significance to Capital functions. NILM lands include national symbols, riverbanks, parkway corridors, and parks. The Prince of Wales Drive corridor is considered by the NCC to be a significant Cultural Landscape. Our main areas of concern are related to views from the UNESCO Rideau Canal & CEF National Historic Site, scenic entry at Prince of Wales Drive and potential impacts on NCC lands (including stormwater management, proposed lot grading, existing trees, vegetation and encroachments on federal lands). Given the landscape character of this section of the Rideau Canal, we have some concerns with the proposed density, compatibility and suitability of the suggested exterior materials for these residential units. We would encourage the new landscaping materials being proposed to be more reflective of native tress and vegetation to enhance the agricultural landscape setting and context of the National Historic site. 18

19 The proposed development does not identify any snow storage areas, nor waste pick up pads (garbage and recycling). This is a private roadway accessing a public right-of-way, which is a designated scenic entry route to the capital and National Historic Site. We suggest some screening be provided for any waste collection areas visible from the street. There appears to be a large percentage of hard surface on this development plan, there is very little permeable surface and this shall increase run off to the abutting federal lands. The SWM proposal is not presently acceptable to us, as downstream land owners. The ability for this unit layout to accommodate any season snow storage is severely limited. Although not presently permitted, the NCC would not support any future public parking on Prince of Wales Drive in this location. This development is being reviewed as a PUD and therefore the yard setbacks treated as one lot. We suggests that a 1.2 m (side yard) setback is not appropriate and suggest the rear yards of these (eventual stand alone residential units) be increased to a minimum of 5 meters where abutting federal lands. This could mitigate any possible encroachments on federal lands in the future, reduce impacts from access, property maintenance issues over the lifecycle of the units. What is this entrance feature? Please provide some added details. At this time, please do not view these as final SPA comments from the NCC. We wish to review added details related to the issues below and may wish to make added comments or potential conditions of Site Plan Approval (to be in a formal SP agreement). We would ask that no formal conditions of Site Plan be finalized by the City until such time as the major NCC concerns are resolved (or substantially agreed to). Comments 1. The abutting lands form part of the Central Experimental Farm (CEF); designated a National Historic Site. Prince of Wales is an integral part of the historic landscape of the Central Experimental Farm. Prince of Wales is identified in the City of Ottawa Official Plan and the NCC s Plan for Canada s Capital as a scenic-entry and capital arrival route, with a set of criteria related to future development applications along it. There is an existing federal management plan for the CEF and the City should also endeavor to obtain comments directly from the Corporate Management Branch of Agriculture and Agri-Food Canada with regards to impacts/mitigation. 2. Please forward the details of the proposed retaining wall abutting the east property line (abutting NCC lands). The NCC generally discourages development which does not meet the existing grade on abutting federal lands. There will be added consultations required with NCC prior to final approval being granted to the grading /SWM plan. 3. The proposed grading at the northern property line appears to be designed at a 3:1 slope, in some areas 6% and 7% gradients. This seems to be a less than desired amenity space for each of these units and may not be appropriate for the long term lifecycle of the matured landscape materials. The balcony amenities are within 1.2 m of the property line. The proponent should be required to provide a minimum 1.2 m flat surface to access the units for maintenance purposes. 19

20 Please have the proponent provide a detailed cross section at the property lines which abut federal lands. 4. Please include this as a formal condition of approval and to be reflected in any agreements of purchase and sale with future owners; The proponent shall erect a fence, with no gates permitted, abutting federal lands. This fence shall be located on private property. The NCC would ask that this be clearly reflected in the conditions of Site plan and the formal Site Plan Agreement with the proponent. The design details shall be submitted to the NCC for review prior to Site Plan approval. 5. Please forward a copy of the SWM report submitted by the proponent s consultant. The proposal for this site to have the stormwater management outletting to NCC lands does not presently satisfy the NCC. We suggest further discussions on options for servicing design be considered. (quantity) 6. Please advise if the City required the applicant to submit a Cultural Heritage Impact Statement (City OP section 4.6.1) for this development. (Please forward if one has been submitted). 7. Please advise if this development shall have curbside waste pick up, or whether a private contractor (and private disposal bins) shall be required. Should the site be proposed for curbside collection, given the location along this scenic entry route, we suggest the development design identify a garbage pad, with screening from the street. 8. Please provide added details on the proposed entrance feature visible from Prince of Wales Drive. Thank you Sandra Candow cc (via ) Susan Millar- Parks Canada J. Batchelor- RVCA NCC- M. Muir, Bina C. 20

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25 City of Ottawa Servicing Study Checklist General Content Executive Summary (for large reports only): not applicable Date and revision number of the report: see page 1 of Servicing Brief Location map and plan showing municipal address, boundary, and layout of proposed development: see drawings SG-1, SG-2, SS-1 & SS-2. Plan showing the site and location of all existing services: see drawings SG-1, SG-2, SS-1 & SS-2. Development statistics, land use, density, adherence to zoning and official plan, and reference to applicable subwatershed and watershed plans that provide context to which individual developments must adhere: not applicable Summary of Pre-consultation Meetings with City and other approval agencies: not applicable Reference and confirm conformance to higher level studies and reports ( Master Servicing Studies, Environmental Assessments, Community Design Plans), or in the case where it is not in conformance, the proponent must provide justification and develop a defendable design criteria: not applicable Statement of objectives and servicing criteria: see page 1 of Servicing Brief Identification of existing and proposed infrastructure available in the immediate area: see drawings SG-1, SG-2, SS-1 & SS-2. Identification of Environmentally Significant Areas, watercourses and Municipal Drains potentially impacted by the proposed development ( Reference can be made to the Natural Heritage Studies, if available). see page 2 of Servicing Brief (Rideau Canal) Concept level master grading plan to confirm existing and proposed grades in the development and drainage, soil removal and fill constraints, and potential impacts to neighbouring properties. This is also required to confirm that the proposed grading will not impede existing major system flow paths: not applicable Identification of potential impacts of proposed piped services on private services (such as wells and septic fields on adjacent lands) and mitigation required to address potential impacts: not applicable Proposed phasing of the development, if applicable: not applicable Reference to geotechnical studies and recommendations concerning servicing: see note 1.5 on drawing SG-2 All preliminary and formal site plan submissions should have the following information: Metric scale: included North arrow: included (including construction North): not included Key Plan: included Name and contact information of applicant and property owner: not included Property limits: included including bearings and dimensions: included Existing and proposed structures and parking areas: included Easements, road widening and rights-of-way: included Adjacent street names: included Development Servicing Report: Water Confirm consistency with Master Servicing Study, if available: not applicable Availability of public infrastructure to service proposed development: see page 2 of Servicing Brief Identification of system constraints: see page 2 of Servicing Brief Confirmation of adequate domestic supply and pressure: see page 2 of Servicing Brief 25

26 Confirmation of adequate fire flow protection and confirmation that fire flow is calculated as per the Fire Underwriter s Survey. Output should show available fire flow locations throughout the development: see page 2 Servicing Brief Provide a check of high pressures. If pressure is found to be high, an assessment is required to confirm the application of pressure reducing valves: see page 2 of Servicing Brief Definition of phasing constraints. Hydraulic modeling is required to confirm servicing for all defined phases of the project including the ultimate design: not applicable Address reliability requirements such as appropriate location of shut-off valves: not applicable Check on the necessity of a pressure zone boundary modification:. not applicable Reference to water supply analysis to show that major infrastructure is capable of delivering sufficient water for the proposed land use. This includes data that shows that the expected demands under average day, peak hour and fire flow conditions provide water within the required pressure range: not applicable Description of the proposed water distribution network, including locations of proposed connections to the existing systems, provisions for necessary looping, and appurtenances (valves, pressure reducing valves, valve chambers, and fire hydrants) including special metering provisions: not applicable Description of off-site required feedermains, booster pumping stations, and other water infrastructure that will be ultimately required to service proposed development, including financing, interim facilities, and timing of implementation: not applicable Confirmation that water demands are calculated based on the City of Ottawa Design Guidelines: see page 2 of Servicing Brief Provision of a model schematic showing the boundary conditions locations, streets, parcels, and building locations for reference: not applicable Development Servicing Report: Wastewater Summary of proposed design criteria: see page 3 of Servicing Brief (Note: Wet-weather flow criteria should not deviate from the City of Ottawa Sewer Design Guidelines. Monitored flow data from relatively new infrastructure cannot be used to justify capacity requirements for proposed infrastructure): not applicable Confirm consistency with Master Servicing Study and /or justification for deviations: not applicable Consideration of local conditions that may contribute to extraneous flows that are higher than the recommended flows in the guidelines. This includes groundwater and soil conditions, and age and conditions of sewers: not applicable Descriptions of existing sanitary sewer available for discharge of wastewater from proposed development: see page 3 of Servicing Brief Verify available capacity in downstream sanitary sewer and / or identification of upgrades necessary to service the proposed development. (Reference can be made to previously completed Master Servicing Study if applicable): not applicable Calculations related to dry-weather and wet-weather flow rates from the development in standard MOE sanitary sewer design table (Appendix C) format. not applicable Description of proposed sewer network including sewers, pumping stations, and forcemains: see page 3 of Servicing Brief Discussion of previously identified environmental constraints and impact on servicing (environmental constraints are related to limitations imposed on the development in order to preserve the physical condition of watercourses, vegetation, soil cover, as well as protecting against water quantity and quality): not applicable Pumping stations: impacts of proposed development on existing pumping stations or requirements for new pumping station to service development: not applicable 26

27 Forcemain capacity in terms of operational redundancy, surge pressure and maximum flow velocity: not applicable Identification and implementation of the emergency overflow from sanitary pumping stations in relation to the hydraulic grade line to protect against basement flooding: not applicable Special considerations such as contamination, corrosive environment etc: not applicable Development Servicing Report: Stormwater Checklist Description of drainage outlets and downstream constraints including legality of outlets (i.e. municipal drain, right-of-way, watercourse, or private property): see page 3 of Servicing Brief Analysis of available capacity in existing public infrastructure. not applicable A drawing showing the subject lands, its surroundings, the receiving watercourse, existing drainage patterns, and proposed drainage pattern: see drawing SG-1 Water quality control objective (e/g/ controlling post-development peak flows to pre-development level for storm events ranging from the 2 or 5 year event (dependent on the receiving sewer design) to 100 year return period); if other objectives are being applied, a rationale must be included with reference to hydrologic analyses of the potentially affected subwatersheds, taking into account long-term cumulative effects: see Stormwater Management Report Water Quality control objective (basic, normal or enhanced level of protection based on the sensitivities of the receiving watercourse) and storage requirements: see Stormwater Management Report Descriptions of the references and supporting information. Set-back from private sewage disposal systems. not applicable Watercourse and hazard lands setbacks: see drawing SG-1 Record of pre-consultation with the Ontario Ministry of Environment and the Conservation Authority that has jurisdiction on the affected watershed: not available Confirm consistency with sub-waterched and Master Servicing Study, if applicable study exists: not applicable Storage requirements (complete with calculations) and conveyance capacity for minor events (1:5 year return period) and major events (1:100 year return period). see drawing SG-1 & SG-2 and Stormwater Management Report Identification of watercourses within the proposed development and how watercourses will be protected, or, if necessary, altered by the proposed development with applicable approvals. see drawing SG-1 & SG-2 and Stormwater Management Report Calculate pre and post development peak flow rates including a description of existing site conditions and proposed impervious areas and drainage catchments in comparison to existing conditions: see Stormwater Management Report Any proposed diversion of drainage catchment areas from one outlet to another. : not applicable Proposed minor and major systems including locations and sizes of stormwater trunk sewers, and stormwater management facilities. : not applicable If quantity control is not proposed, demonstration that downstream system has adequate capacity for the post-development flows up to and including the 100-year return period storm event: not applicable Identification of potential impacts to receiving watercourses: see Stormwater Management Report Identification of municipal drains and related approval requirements. : not applicable Descriptions of how the conveyance and storage capacity will be achieved for the development: see page 3 of Servicing Brief 100 year flood levels and major flow routing to protect proposed development from flooding for establishing minimum building elevations (MBE) and overall grading: Inclusion of hydraulic analysis including hydraulic grade line elevations. : not applicable 27

28 Description of approach to erosion and sediment control during construction for the protection of receiving watercourses of drainage corridors: see notes 2.1 to 2.5 on drawing SG-2 Identification of floodplains proponent to obtain relevant floodplain information from the appropriate Conservation Authority. The proponent may be required to delineate floodplains elevations to the satisfaction of the Conservation Authority if such information is not available or if information does not match current: not applicable Identification of fill constraints related to floodplain and geotechnical investigation. : not applicable Approval and Permit Requirements: Checklist The Servicing Study shall provide a list of applicable permits and regulatory approvals necessary for the proposed development as well as the relevant issues affecting each approval. The approval and permitting shall include but not be limited to the following: Conservation Authority as the designated approval agency for modification of floodplain, potential impact on fish habitat, proposed works in or adjacent to a watercourse, cut/fill permits and Approval under Lakes and Rivers Improvement Act. The Conservation Authority is not approval authority for the Lakes and Rivers Improvement Act. Where there are Conservation Authority regulations in place, approval under the Lakes and Rivers Improvement Act is not required, except in cases of dams as defined in the Act: the Rideau Conservation Authority has not been contacted Application for Certificate of Approval (CofA) under the Ontario Water Resources Act: Changes to Municipal Drains. : not applicable Other permits (National Capital commission, Parks Canada, public Works and Government Services Canada, Ministry of transportation etc.) : not applicable Conclusion Checklist Clearly stated conclusions and recommendations: see page 3 of Servicing Brief Comments received from review agencies including the City of Ottawa and information on how the comments were addressed. Final sign-off from the responsible reviewing agency. All draft and final reports shall be signed and stamped by a professional Engineer registered in Ontario: included 28