Feasibility Study and Technical Report - Pretivm

18.3 ACCESS18.3.1 ACCESS ROADSThe Brucejack access road was constructed as a temporary, all-season explorationaccess road that commences at Highway 37 at km 216 and travels generally westward toBrucejack Lake, a distance of 73.5 km. The road route is shown in Figure 18.1. Theaccess road is separated into the following sections (km 0 is located at the Highway 37intersection):• Section 1: km 0 to 35: new road construction• Section 2: km 35 to 59: existing road upgrade• Section 3: km 59 to 71: Knipple Glacier road• Section 4: km 71 to 74: Brucejack Lake road upgrade.The road is generally designed and constructed as follows:• L100 minimum design loading, with consideration of equivalent D9 trackloading• 5.0 m road width, with 0.3 m wide by 0.8 m deep ditches between km 0 and 35• 6.0 m road width, with 0.3 m wide by 0.8 m deep ditches between km 64.6 and67• 30 m right-of-way width• 30 km/h design speed, 35 m minimum turning radius• maximum 12% sustained grade, 18% pitches less than 150 m (with exceptions)• maximum 500 m turnout spacing, optimum 300 m spacing• 7% maximum grade break per 15 m travel• Q100 flow culvert design: drains are usually a 500 mm diameter pipe, used at low spots to redirectditch line flows and wet depression accumulations and to broadcast theseflows to natural forest floor below the road where filtration will occur non-classifiable drainage, 500 mm or larger diameter pipe, used at verysmall drainages that do not meet the criteria to be a classifiable stream S5 and S6 stream classifications, 600 mm or larger diameter pipe, used atdrainages that can be classified 50 m buffer to wildlife habitat.Upon receipt of construction permits, these road sections−with the exception of theKnipple Glacier section−will require additional upgrading to improve safety and to handlethe higher traffic loadings from both construction and operations activities. The work willPretium Resources Inc. 18-7 1291990200-REP-R0012-02Feasibility Study and Technical Report on the BrucejackProject, Stewart, BC