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• J i I 4.5 SURFACE WATER DIVERSION The stability of all fills and soil cuts at the site has been shown to be quite sensitive to even relatively small pore water pressures. Our analyses indicate that some marginally stable cuts and fills could become unstable if subject to in- creased pore water pressures. The safety factors of other cuts or fills could become unacceptable even if the slopes themselves remained stable. For these reasons, it is vital that the entry of water into the fills and natural soil cuts be eliminated to the Greatest extent possible both during cur- rent operations and subsequent to reclamation. i Water Level measurements taken in monitoring wells during our field investigation indicated that ground water, where en- countered, was generally deep within the colluvial soils or within bedrock. No ground water was encountered within the crushing and screening level fill. However, ground water levels can be expected to rise to some extent during the ii spring snow melt. To minimize this increase in ground water, ~ surface water should be diverted away from the fills and nat- I~I~ ural soils at the site in order to minimize infiltration. fl General recommendations regarding the proposed surface water diversion scheme are given in the previously referenced j report by Merrick fi Co. jl Respectfully submitted \\\`\`~~ttuiuuum~~~~~~ GEO-HYDRO CONSULTING, INC. i ~~ o • ? I~ + t~ 1 Jr3 a; J Michal Bukovansky, ^~~~D^ 88"~'~ Senior Engineering Geologist F "'~:. . ~~ ,~`~- t'~Cpt~,~;,` Graeme Major; ~I ~ ~~~~~~. ~~~„ '~!'~'~n, ;; - 38 - Geotechnical Engineer 'I II ~caMrovo cor+wuiH~, u+c.