Carlington Community Health Centre & Ottawa Community Housing Hub
Total Page:16
File Type:pdf, Size:1020Kb
Carlington Community Health Centre & Ottawa Community Housing Hub 900 Merivale Road, City of Ottawa Site Servicing and Stormwater Management Report Prepared for: CSV Architects 402-1066 Somerset West Ottawa, Ontario K1Y 4T3 Prepared by: McIntosh Perry 115 Walgreen Road Carp, ON K0A 1L0 April 1st, 2016 REV02: August 16th, 2016 CP-16-0005 900 Merivale Road CP-16-0005 Carlington Community Health Centre Hub Site Servicing & Stormwater Management Report TABLE OF CONTENTS 1.0 PROJECT DESCRIPTION ........................................................................................................................................1 1.1 Purpose ................................................................................................................................................................... 1 1.2 Site Description ....................................................................................................................................................... 1 2.0 BACKGROUND STUDIES .......................................................................................................................................2 3.0 PRE-CONSULTATION SUMMARY ..........................................................................................................................2 4.0 EXISTING SERVICES .............................................................................................................................................3 4.1 Coldrey Avenue ....................................................................................................................................................... 3 4.2 Merivale Road ........................................................................................................................................................ 3 5.0 SERVICING PLAN .................................................................................................................................................3 5.1 Water Servicing ...................................................................................................................................................... 4 5.2 Sanitary Servicing ................................................................................................................................................... 4 5.3 Storm Servicing ....................................................................................................................................................... 4 6.0 STORMWATER MANAGEMENT ............................................................................................................................5 6.1 Design Methodology .............................................................................................................................................. 5 6.2 Site Drainage .......................................................................................................................................................... 6 6.2.1 Pre-Development Drainage ............................................................................................................................. 6 6.2.2 Post-Development Drainage ........................................................................................................................... 6 6.3 Quantity Control ..................................................................................................................................................... 7 6.4 Quality Control ....................................................................................................................................................... 8 7.0 SEDIMENT AND EROSION CONTROL ....................................................................................................................9 8.0 SUMMARY ..........................................................................................................................................................9 9.0 RECOMMENDATION ......................................................................................................................................... 10 i 900 Merivale Road CP-16-0005 Carlington Community Health Centre Hub Site Servicing & Stormwater Management Report List of Figures FIGURE 1: KEY MAP: 900 MERIVALE ROAD, OTTAWA ..................................................................................................1 List of Tables TABLE 1: PRE-DEVELOPMENT DRAINAGE SUMMARY ...................................................................................................6 TABLE 2: POST-DEVELOPMENT RUNOFF CALCULATIONS ..............................................................................................6 TABLE 3: ALLOWABLE RELEASE RATE ..........................................................................................................................7 TABLE 4: POST-DEVELOPMENT RESTRICTED RUNOFF CALCULATIONS ..........................................................................7 TABLE 5: STORAGE SUMMARY ....................................................................................................................................8 List of Appendices Appendix A: City of Ottawa Pre-Consultation Notes Appendix B: Existing Watermain Flow and Fire Calculations Appendix C: Sanitary Sewer Calculation Appendix D: Pre-Development Plan Appendix E: Post-Development Plan Appendix F: Stormwater Calculations Appendix G: City of Ottawa Design Checklist ii 900 Merivale Road CP-16-0005 Carlington Community Health Centre Hub Site Servicing & Stormwater Management Report 1.0 PROJECT DESCRIPTION 1.1 Purpose This report will address the servicing (water, sanitary, and storm) and stormwater management requirements and the adequacy of the existing services associated with the building expansion to the Carlington an increase to the ground floor area by 1,260 m2. In addition to the ground floor expansion, the upper floors will have 42 senior apartment suites added in conjunction with Ottawa Community Housing (OCH). It is also our understanding that the site is comprised of one parcel of land with an approximate area of 2.0 acres. CSV Architects has developed a preliminary design concept (See Appendix ‘A’ for details). 1.2 Site Description The property is located at 900 Merivale Road in the City of Ottawa and covers approximately 2.0 acres. The legal description of the land is Lots 1-7, Registered Plan 392 and Part of Blocks 2-4, Registered Plan 211, Geographic Township of Nepean, City of Ottawa. The existing site is currently developed as the Carlington Community Health Centre with associated asphalt parking and landscape areas. The site is bound by Coldrey Avenue to the north and Merivale Road to the east. All adjacent properties surrounding the site are currently developed with various uses. See Figure 1: Key Map. The development incorporates the proposed expansion to the health centre, a connection hub and 42 senior apartment suites within the City of Ottawa. The expansion will include a 290 m2 1-storey entrance hub along with a 1,000 m2 health clinic with 3-storeys of senior apartment suites above. Figure 1: Key Map: 900 Merivale Road, Ottawa 1 900 Merivale Road CP-16-0005 Carlington Community Health Centre Hub Site Servicing & Stormwater Management Report 2.0 BACKGROUND STUDIES Background studies that have been completed for the site include review of the City of Ottawa as-built drawings, a geotechnical report, Phase 1 & 2 Environmental Site Assessment (ESA), a topographical survey of the site and tree conservation report. As-built drawings of the existing services within the vicinity of the site were reviewed in order to determine proper servicing and stormwater management for the site. A topographic survey of the site was completed by Farley, Smith and Denis Surveying Ltd. dated February 5th, 2016, and can be found under separate cover. A Phase 1 ESA was completed by Inspec-Sol dated April 5th, 2013. The report concluded that a Phase 2 be completed for the site. This report was updated by Paterson Group dated February 2016, both the original and updated report can be found under separate cover. A Phase 2 ESA was completed by Paterson Group dated May 13th, 2013. The report found that the former presence of underground heating oil storage tanks on the subject site and the historic presence of a retail fuel outlet south of the site have not significantly impacted the subject land. This report was updated by Paterson Group dated February 2016, both the original and updated report can be found under separate cover. A geotechnical report was completed by Paterson Group dated July 4th, 2013. The investigation found that the soils encountered at the borehole locations consisted of surficial covering topsoil, overlying stiff silty clay. Groundwater was noted between 2.0 m and 5.5 m below the existing grade. However, the ground water levels were noted to be in a ‘perched’ condition. The entire report can be found under separate cover. A tree conservation report was completed for the site by McIntosh Perry dated March 2016. The report can be found under separate cover. 3.0 PRE-CONSULTATION SUMMARY City of Ottawa Staff were pre-consulted regarding this proposed development in person on February 2nd, 2016. Specific design parameters to be incorporated within this design include the following: Pre-development and post-development flows shall be determined using a calculated time of concentration (Tc). Tc cannot be less than 10 minutes. Control 5 and 100-year post-development flows to the 5-year pre-development flow