Slope Stability Review Memorandum - Levelton Consultants Ltd.

RAR Stability Review: Thetis Vale Subdivision – Phase 7, View Royal

Slope Stability

Reach 1 of the unnamed tributary channel flows through bedrock-controlled terrain that remains forested at the time of our review. There are six lots situated on the north side of the existing creek that are partially (Lot 15) or completely located within the RAA (Lots 13, 14, 16, 17 and 18). On the south side of the gully, Lot 12 is located within the RAA while small portions of Lots 5, 6, 7, 8 9, 10 and 11 are located within the RAA. The proposed cul-de-sac located on the south east side of the gulley is also located within the RAA.

The slopes on either side of Reach 1 were measured to range from 25 to 40 degrees with intact bedrock outcrops exposed on both slopes. Mature trees were observed on the slope with little or no evidence of instability over the lifetime of the trees. The creek is running within a well-defined channel and the potential for instability due to erosion from the creek is minimal.

Development of the proposed subdivision, including the lots and road alignments within the RAA will be conducted through blasting of the intact bedrock where necessary to lower the grade and placement of blasted shotrock fills in fill areas. The majority of the creek slopes, including the toe of the slopes, are located within the 10m SPEA of the creek, and as such, development will not affect the support of the bedrock slopes. Based on the location of the proposed lots and road alignments, slope stability within the RAA will not be adversely affected by the proposed development.

Alec Morse, P.Eng. – APEGBC License# 29660 Levelton Consultants Ltd. 760 Enterprise Crescent, Victoria, BC, V8Z 6R4 Ph: 250-475-1000 / 250-889-2576