RYZUK GEOTECHNICAL Geotechnical Field Review (September 1, 2020)

Geotechnical Field Review

Project No: 7877-7 Project: Proposed Residential Structure - 1938 West Park Lane - View Royal, BC Client: Seymour Pacific Developments Ltd. Contact: Dave Cooper Email / Fax No: dave.cooper@seymourpacific.ca Date: September 1, 2020

Copy to:

• Dave Cooper - Seymour Pacific (dave.cooper@seymourpacific.ca)
• Roxann Huber - Seymour Pacific (roxann.huber@seymourpacific.ca)
• Troy Wheler - Seymour Pacific (troy.wheler@seymourpacific.ca)
• Brett Cheek - Seymour Pacific (brett.cheek@seymourpacific.ca)
• Matt Floch - Western Grater (matt.floch@norlandlimited.com)

Re: Rock/Soil Slope Lock Block Retaining Wall

As requested, we have attended site periodically during the construction of the lock block retaining wall along the western property line to ensure such was carried out in conformance with the specifications provided in our design drawing package entitled Rock Wall/Soil Stabilization (SECTION – Soil Retaining Wall), dated March 2020. Our associated observations and comments are contained herein.

Foundation preparation for the lock block wall consisted of the placement and compaction of 19 mm minus atop intact bedrock. Retaining wall construction was undertaken simultaneously with the concrete support wedge backfill. The wedge extended a total height equal to between 4 and 5 blocks (3 to 3.75 m) and was pinned to the blocks and intact bedrock with 15 M dowels, as per design. Geogrid reinforced granular backfill consisting of mixed blast rock and crushed gravel was used for the top 2.25 m portion of the wall to support a backfill slope of 2H: 1V. The wall was embedded a total of one block height (0.75 m) following construction.

The wall continues further north and transitions to the 2-block high enclosed catchment in front of the mesh drapery.

Geogrid placement and fill compaction was assessed in multiple visits during construction. Based on our observations, we consider the lock block retaining wall and enclosed catchment area to have been installed in conformance with our recommendations and design. However, the fence atop the catchment wall will need to be installed before the system is considered complete.

We trust the above is suitable for your purposes at present. If you have any questions, or require further clarification, please call.

Regards, Ryzuk Geotechnical

Cam Schellenberg, EIT Junior Engineer

Antoine Letendre, M.Eng., P.Eng. Project Engineer