Geotechnical Field Review Reports – Ryzuk Geotechnical
Reports covering rock slope remediation, rockfall drapery mesh, and concrete shear keys for slope stability.
GEOTECHNICAL FIELD REVIEW
Project No: 2635-8
Project: West Park at Thetis Residential Development
Project Address: 1938/1950 West Park Lane - View Royal, BC
Date: April 17, 2024
Client: Limona Construction
Contact: John Sercombe
Email: John@limonagroup.com
Rock Slope Remediation Summary
As requested, we herein provide a summary of the previously completed rock slope stabilization remediation works within the current and past phases of the West Park at Thetis residential development. We have attended the referenced site periodically over the last 4 years to assess the rock slope conditions throughout the current phases of the development and to oversee slope stabilization construction. Our work has been undertaken in accordance with and is subject to, the previously accepted Terms of Engagement.
Most notably, our geotechnical assessments and slope stabilization oversight was undertaken at the following locations:
- Rockfall draper mesh – Lane ‘B’, West end of Blocks F, H, and playground perimeter (Phase 2)
- Rock Scaling – Block O (Phase 3)
- Concrete Shear Keys – Block S (Phase 6)
- Rock Scaling – Block R (Phase 6)
Summaries of the stabilization work and of our associated involvement at each location can be found in the Attachments.
The work to-date was completed in general conformance with our recommendations and design. As we note in our geotechnical summaries, periodic slope maintenance consisting of hand scaling should be completed every 5 years or following a seismic event.
We trust the preceding is suitable for your purposes at present. Please do not hesitate to contact our office if you have any questions.
Regards,
Ryzuk Geotechnical
PN 1002996
Cam Schellenberg, P.Eng.
Lead Engineer
Attachments:
- Rockfall draper Mesh Installation
- Concrete Shear Keys – Block S
- Rock Scaling – Block O
- Rock Scaling – Block R
GEOTECHNICAL FIELD REVIEW
Project No: 2635-7
Project: West Park at Thetis Residential Development
Project Address: 1938 West Park Lane, View Royal, BC
Date: April 12, 2021
Client: Limona Construction
Contact: Mike Baier
Email: limonaconstruction@gmail.com
Distribution:
Richard Mounce - C-1 Contractors - c1richardm@gmail.com
John Scott - C-1 Contractors - c-1site@telusmail.net
John Sercombe - Limona Construction - limona.john@shaw.ca
Ellie Sercombe - Limona Construction - ellie@limonagroup.com
Brian Rimmer - C-1 Contractors - b.rimmer@shaw.ca
Rockfall Draper Mesh Installation
As requested, we have attended site periodically during the installation of the rock slope drapery to confirm such was carried out in conformance with the specifications provided in our design memo entitled Rock Slope Assessment – Lane ‘B’, West end of Blocks F and H, and Perimeter of the Playground, dated November 18, 2020. Our associated observations and comments are contained herein.
Suspension cable support anchors consisting of #8 galvanized threadbar were embedded a minimum of 1 m into sound rock along the crest of the slope at 1.5 m spacing. Galvanized eye nuts were threaded onto the support anchors which held the intertwined 19 mm steel wire suspension cable and steel mesh at the top of the rock slope. The steel mesh was installed with suitable overlap between adjacent sections and extended to the top of the partially enclosed lock block catchment area at the base of the slope.
Based on our observations during installation, we consider the drapery to have been installed in general conformance with our recommendations and design. Some periodic maintenance of the drapery mesh as well as removal of accumulated debris within the catchment area may be required following mobilization of weathered rock.
We trust the above is suitable for your needs at present. Should you require any clarification on the above, please do not hesitate to contact our office.
Best regards,
Ryzuk Geotechnical
Cam Schellenberg, P.Eng.
Intermediate Engineer
GEOTECHNICAL FIELD REVIEW
Project No: 2635-8
Project: West Park at Thetis Residential Development Ph. 6
Project Address: 1950 West Park Lane - View Royal, BC
Date: April 4, 2024
Client: Limona Construction
Contact: John Sercombe
Email: John@limonagroup.com
Distribution:
Ellie Sercombe – Limona Construction – ellie@limonagroup.com
Brian Rimmer – C-1 Contractors – b.rimmer@shaw.ca
Kleigh Sercombe – Limona Construction – sercombe.k9@gmail.com
Concrete Shear Keys – Block S
As requested, we attended the referenced site periodically over the recent months to assess the ongoing lot preparation and rock slope scaling works being carried out on the approximately 13 m high rock slope which ascends from the northern side of the proposed Block S residential building. Our associated observations, comments, and recommendations are contained herein. Our work had been undertaken in accordance with and is subject to, the previously accepted Terms of Engagement.
We have previously provided geotechnical recommendations via email dated June 28th and September 27th, 2023, that summarize our initial assessments and recommendations regarding rock slope stability for the subject area where we provided specification for concrete buttress installation.
Based on our site observations, we consider the noted scaling and installation of a two (2) steel-reinforced/anchored concrete buttresses within the rock slope to have been undertaken in accordance with our recommendations. The exposed rock faces will occasionally undergo spalling of loose rock as a result of the naturally weathering process over the long term or seismic ground motions. Accordingly, periodic slope maintenance consisting of hand scaling should be completed every 5 years or following a seismic event.
We trust the preceding is suitable for your purposes at present. Please do not hesitate to contact our office if you have any questions.
Regards,
Ryzuk Geotechnical
PN 1002996
Cam Schellenberg, P.Eng.
Lead Engineer
GEOTECHNICAL FIELD REVIEW / SITE INSTRUCTION
Project No: 2635-8
Project: West Park at Thetis Residential Development Ph. 3
Project Address: 1950 West Park Lane - View Royal, BC
Date: October 27, 2022
Client: Limona Construction
Contact: Mike Baier
Email: limonaconstruction@gmail.com
Distribution:
John Sercombe – Limona Construction – john@limonagroup.com
Richard Mounce – C-1 Contractors – c1richardm@gmail.com
John Scott – C-1 Contractors – c-1site@telusmail.net
Ellie Sercombe – Limona Construction – ellie@limonagroup.com
Rock Scaling – Block O
As requested, we attended the referenced site on October 21, 2022, to assess the ongoing rock slope scaling works being carried out on the approximately 20 m high rock slope which ascends from the western side of the recently constructed Block O residential building. Our associated observations, comments, and recommendations are contained herein. Our work had been undertaken in accordance with and is subject to, the previously accepted Terms of Engagement.
We have previously provided geotechnical recommendations via email dated February 14, 2021, that summarizes our initial assessment and recommendations regarding rock slope stability for the subject area.
Based on our site observations, we consider the noted scaling and installation of a stacked boulder catchment within the rock slope to have been undertaken in accordance with our recommendations. The exposed rock faces will occasionally undergo spalling of loose rock as a result of the naturally weathering process over the long term or seismic ground motions. Accordingly, periodic slope maintenance consisting of hand scaling should be completed every 5 years or following a seismic event.
We trust the preceding is suitable for your purposes at present. Please do not hesitate to contact our office if you have any questions.
Regards,
Ryzuk Geotechnical
PN 1002996
Cam Schellenberg, P.Eng.
Intermediate Engineer
The above does not constitute approval to proceed with the noted work if such is perceived to be an extra to a Contract, or if the work requires approvals/permits from approving authorities.
GEOTECHNICAL FIELD REVIEW / SITE INSTRUCTION
Project No: 2635-8
Project: West Park at Thetis Residential Development
Project Address: 1950 West Park Lane - View Royal, BC
Date: February 14, 2024
Client: Limona Construction
Contact: John Sercombe
Email: john@limonagroup.com
Distribution:
Ellie Sercombe – Limona Construction – ellie@limonagroup.com
Richard Mounce – C-1 Contractors – c1richardm@gmail.com
John Scott – C-1 Contractors – c-1site@telusmail.net
Rock Scaling – Block R
As requested, we attended the referenced site periodically during excavation/lot preparation to assess the ongoing rock slope scaling works being carried out on the approximately 15 m high rock slope which ascends from the western side of the Block R residential building. Our associated observations, comments, and recommendations are contained herein. Our work had been undertaken in accordance with and is subject to, the previously accepted Terms of Engagement.
Rock stabilization works has consisted of localized machine and hydro scaling to remove potentially hazardous rock blocks which was completed under Ryzuk Geotechnical direction. Based on our site observations, we consider the noted scaling works within the rock slope to have been undertaken in accordance with our recommendations. The exposed rock faces will occasionally undergo spalling of loose rock as a result of the naturally weathering process over the long term or in response to seismic ground motions. Accordingly, periodic slope maintenance, including a geotechnical reassessment, must be completed every 5 years or following any discernible ground motions (seismic event).
Our assessment considers the backyard/patio space can be utilized as a catchment space for smaller spalling rockfall debris. While we do not consider the residence to be at significant risk of rockfall impact, outdoor furniture and other yard infrastructure placed within the slope-facing yard area may be subject to damaging rockfall impact. To further limit rockfall runout into the yard area, a rockfall catchment wall comprising stacked boulders up to 1.0 m high may be constructed along the base of the rock slope. The space between the rock face and boulders should be backfilled with loose topsoil up to 0.3 m below the top of the boulder to provide a catchment for spalling debris.
We trust the preceding is suitable for your purposes at present. Please do not hesitate to contact our office if you have any questions.
Regards,
Ryzuk Geotechnical
PN 1002996
Cam Schellenberg, P.Eng.
Lead Geotechnical Engineer
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