Stormwater Management - 309 View Royal Ave (Islander Engineering)

GENERAL

1. All construction and materials shall be in accordance with the Town of View Royal (TOVR) supplemental specifications and the Platinum Edition of the Master Municipal Construction Documents (MMCD). In the event of a discrepancy between Town specifications and MMCD, the Town specifications shall govern.
2. Sewer, drain, and roads constructed within private property shall be constructed in accordance with the BC Plumbing Code and BC Building Code.
3. A pre-construction meeting shall be held a minimum of 48 hours prior to construction and shall include at a minimum, the contractor, consulting engineer(s), Town of View Royal supervising representative, and utility representatives.
4. All shop drawings for materials shall be approved by the engineer prior to installation.
5. The contractor shall obtain the Town's permit to work within road allowance a minimum of five working days prior to start of construction. The contractor shall submit emergency contact numbers for the Town's representative as part of this permit.
6. Connection or alteration of existing Town-owned utilities shall be done under the supervision of the consulting engineer and Town's representative, unless otherwise authorized by the Town's representative.
7. The contractor shall not commence any backfill utility operations until works have been inspected by the consulting engineer and Town's representative.
8. The contractor shall prepare and submit the following plans to the Town's representative for review and acceptance at least 7 days prior to construction commencement: a. Traffic control plan for each stage of construction. b. Erosion and sediment control plan for construction. c. Construction schedule.
9. The contractor shall contact BC One Call a minimum of three (3) working days prior to start of construction.
10. All existing underground utilities are not necessarily shown. Existing underground utilities are to be located and all utility companies contacted, prior to installing any new underground services.
11. The contractor shall notify all property owners and residents affected by the construction five days prior to starting the construction. The contractor shall also each individually notify each residence or business which will be affected by the next days work.
12. A set of approved construction drawings and the engineering specifications, including the MMCD, shall be maintained by the contractor at the construction site at all times during the installation of the works.
13. All work shall conform to all applicable regulations of WorkSafe BC.
14. Traffic control shall be the responsibility of the contractor and shall comply the BC Traffic Control Manual for Work on Roadways published by the Ministry of Transportation and Infrastructure (MOTI). Safe vehicular and pedestrian access shall be maintained at all times.
15. Existing trees and vegetation shall be protected with protective fencing as per Town of View Royal Std. Drawing VR-L3, except those approved to be removed. The contractor shall retain a professional arborist who shall be responsible for supervising construction activities occurring within the root zone of any trees designated to be retained.
16. Existing private fences and landscaping, including their root systems, shall be thoroughly excavated and disposed of as per CRD regulations prior to construction of infrastructure.
17. The contractor shall be held responsible for any damage caused to existing paved roads or road markings, including wear and tear by construction equipment and/or trucks hauling materials to the site. This shall include daily cleaning or sweeping all existing roads of dirt and debris caused by the work. Such cleaning shall be performed as required at the discretion of the Town's representative.
18. All attempts shall be made to keep private property address markers or posts and mailboxes visible during construction.
19. The contractor shall ensure all open trenches in the traveled lanes are safely driveable, with smooth transitions and surface condition equal to pre-construction condition. This shall be applicable at all times.
20. Legal survey monuments or pins destroyed or damaged during construction shall be replaced by a BC Land Surveyor, at the contractor's expense.
21. All proposed and existing appurtenances shall be adjusted meet final design levels.
22. All surfaces disturbed by construction shall be restored to their original condition or better, all surplus or unsuitable material shall be removed from the site and disposed of properly in accordance with all applicable guidelines and regulations.
23. Record drawings and photos shall be submitted to Weekly Town's representative.

SANITARY SEWER:

1. The contractor shall complete and submit the Town's application for sanitary sewer connection document for all required sanitary sewer services for the project.
2. The contractor shall confirm the location and inverts of existing sanitary sewer connections prior to construction.

CRD WATER SERVICES STANDARD NOTES:

1. Waterworks construction and materials shall be in accordance with CRD water services engineering specification and standard drawings.
2. Maintain minimum 3.0m horizontal separation and 450mm clear vertical separation between water services and sewer services (sanitary or storm/drain). In special circumstances, where a sanitary sewer or a storm drain service is lower than a water service by more than 450mm in elevation, the horizontal separation may be reduced to 1.0 meters except where noted and approved by CRD water services engineering for any reduction in the separation.
3. Maintain a minimum of 1.0m horizontal center to center and 150mm clear vertical separation between water services and electrical, gas and telephone services except where noted and approved by CRD water services.
4. Where practical, services lines and meter boxes shall be installed to finished grade, outside of driveways or paved areas.

EROSION AND SEDIMENT CONTROL:

1. Limit clearing activities to areas scheduled for immediate construction. Areas cleared and not scheduled for construction to be protected from wind and rain by implementation of erosion and sediment control measures such as straw bale covering or alternative.
2. Retain existing ground cover and vegetation where feasible.
3. Restrict vehicle and machine access to areas necessary to conduct the works.
4. Refer to Town of View Royal Bylaw No. 902, Schedule "F" for spill prevention and response.

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POST DEVELOPMENT - SITE RUNOFF ANALYSIS

Table 1 - Site and Storm data

Table 2 - Storage Required

*Note: 10% Climate change factor considered. Required Storage (m³): 3.1

Table 3 - Orifice Sizing (Q=AC√(2gh))

Note: h = 0.35m, C = 0.6

Table 4 - Pit Sizing

*Assumes 40% voids in clear crushed granular material in rock pit.

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[Diagram: Site Plan at Scale 1:200 showing proposed house and garage layout, property boundaries, existing trees to be retained/removed, and proposed drainage infrastructure.]

[Diagram: General Location Plan at Scale 1:2500 showing property location relative to View Royal Avenue and Helmcken Road.]

[Diagram: Detention Rock Pit Detail (NTS) showing cross-section with impermeable liner, 150mm outlet pipe with orifice, inlet from roof leaders, and rock pit fill specifications.]

SERVICING NOTES:

1. Proposed 4.0m wide driveway; asphalt with 250mm subbase (75mm minus crushed gravel) & 150mm of base (19mm minus crushed gravel) subgrade and base material to be compacted to 95% modified proctor density, or as approved by project geotech.
2. New inspection chamber to be installed by View Royal crews at developer's expense. Sewer lateral has been inspected (ABS to PVC) and is in suitable condition for reuse.
3. Proposed on-site stormwater detention area.
4. Existing water service to be capped by CRD at developer's expense.
5. Proposed 25mm water service c/w meter & meter box to be installed by CRD at developer's expense.
6. Proposed culvert w/ headwalls, as per MMCD Platinum, Std Dwg S15. The culvert can be CMP, ductile iron or reinforced concrete with minimum cover as per manufacturer's specifications to ensure H20 load rating.
7. Existing utility pole.

REPLACEMENT TREES

• RT1 - SUN VALLEY RED MAPLE
• RT2 - SUN VALLEY RED MAPLE
• RT3 - GARRY OAK TRANSPLANTED
• NT2 - NON-PROTECTED COUNTED AS REPLACEMENT

TABLE - ROCKPIT SUMMARY

DIMENSIONS

• WIDTH (m): 1.50
• LENGTH (m): 15.00
• DEPTH (m): 0.35
• ROCK PIT VOL.: 7.88m³
• WATER STORAGE VOL.: 3.15m³
• REQ. STORAGE VOL. (BYLAW): 3.10m³

LEGEND

• [Circle Symbol]: Existing tree and critical root zone (CRZ, orange dashed circle)
• [X Symbol]: Existing tree to be removed
• [Dashed Area]: Proposed asphalt
• [Stippled Area]: Proposed on-site stormwater management area
• Drain Line (Solid)
• Sewer Line (Dashed)
• Water Line (Dashed)
• Gas Line (Dashed)
• Hydro Line (Dashed)
• Telecom Line (Dashed)
• Catch Basin [Symbol]
• Manhole [Symbol]
• Valve [Symbol]
• Hydrant [Symbol]
• Street Light [Symbol]