Map 1 of 26 – Peace Canyon Dam Preliminary Impact Lines, Highway 29 Realignments and Agriculture Assessment March 2013

Kilometre Current Conditions Reservoir Conditions and Preliminary Impact Lines Related to the Proposed Site C Reservoir 21-27 Location Proposed Reservoir This map sheet covers from approximately river kilometre 20.5 to 27 (measured Within this map sheet, the proposed Site C reservoir would have a width ranging from about 175 metres to 850 downstream from the W.A.C. Bennett Dam). It extends from the upstream end of the metres. Based on the river surface elevation at the time of topographic survey, the reservoir would cause an proposed Site C reservoir near Peace Canyon Dam downstream to the west end of increase in water depth over river conditions ranging from less than 1 metre at the upstream end to about 11 Hudson’s Hope. Alwin Holland Park is located near river kilometre 24. metres at the downstream end of the map sheet.

Geology and Topography Preliminary Impact Lines The riverbanks on both sides of the river predominantly comprise siltstone and sandstone Due to the steepness of the natural bedrock slopes, the reservoir shoreline and the flood impact line are located bedrock that, in most locations, is capped by a layer of sand and gravel. The slopes are very close together in aerial-view. steep and range from about 45 to 85 degrees. Where the slopes are steeper, they are sometimes subject to small rock slides, topples, and falls. The sand and gravel cap at the Typically less than 1 metre of shoreline erosion is predicted over the life of the project within the bedrock and so top of the banks is often subject to surface erosion. the erosion impact line is also located very close to the shoreline.

Highway 29 and Other Infrastructure The stability impact line is typically located between 5 and 25 metres from the crest of the slope, depending on Highway 29 crosses the about 750 metres downstream from Peace Canyon the steepness and height of the slope and thickness of the gravel cap. It is extremely unlikely that sudden Dam and runs north-east along the north bank of the river towards Hudson’s Hope. landslides will reach the position of the stability impact line within the life of the project.

Highway 29 Realignment No changes to Highway 29 or the bridge would be required within this map sheet.

Agriculture Assessment Land Use Within Preliminary Impact Lines BC Hydro has developed an approach to land use on private property within the impact lines. The approach Improved (irrigated and/or drained) agricultural land capability ratings are provided for the focuses on public safety, maximizing flexibility for land owners, and minimizing the amount of land required by the Site C project component areas where additional soil survey work has been undertaken as project. BC Hydro’s approach would be as follows: part of the Agriculture Assessment.  BC Hydro would purchase land between the current river shoreline and the area required for the proposed reservoir, up to the Maximum Normal Reservoir Level (461.8 metres above sea level) For remaining lands outside the Site C project component areas, including the Peace River  No new residential structures would be permitted within impact lines valley downstream of the , unimproved agricultural land capability ratings are  Non-residential structures could remain, pending site specific geotechnical assessment provided. The unimproved ratings reflect published agricultural capability maps from the  Within the Stability Impact Line, existing residential structures could remain for a period of time, at the 1970s, based on an assumed low climatic moisture deficit (CMD) during the growing season owner’s request and provided a site-specific geotechnical assessment determines that it is safe to do so in the range of 34 mm. However, subsequent climate studies have confirmed much drier  Within the Flood, Erosion or Landslide-Generated Wave Impact Line, existing residential structures would conditions in the Peace River valley, with a CMD in the range of 148 mm, which results in a not be permitted to remain, to protect public safety Class 3 unimproved climatic capability rating. With irrigation, it is likely that Peace River  Other activities such as agriculture, grazing and trapping could continue within the impact lines valley soils downstream of the Site C dam historically rated as Class 2 or Class 3 with aridity or soil water holding capacity limitations, which would now be rated as unimproved Class 3 The establishment of reservoir impact lines is intended to ensure public safety while maximizing land use due to climatic limitations, would improve to Class 2 or Class 1 with irrigation. flexibility, and to minimize the amount of land required by the project. BC Hydro will purchase the property rights required for the impact lines. Where impacts and implications on zoning, land use and property acquisition cannot be avoided, BC Hydro will identify and evaluate options for mitigation.

BC Hydro is meeting directly with property owners whose land may be impacted to discuss their specific property interests.

Peace River Valley Definition BC Hydro defined the Peace River Valley as a spatial area, reflecting the Peace River mainstem from the Peace Canyon Dam to the B.C.-Alberta border. The upper edge of the Peace River Valley is defined as the crest of the top of high bank slopes, typically between El. 620 and 850m. The purpose of spatially defining the valley was to provide a consistent area for use where relevant in the Environmental Impact Statement.

Map Follows on Next Page These maps are best viewed printed on 11”x17” paper

(2) Map 1: Peace Canyon Dam - Km 21-27 0 (2) 7 7 7 7 (2) 7 4 (2) ³ (2) r ve Ri e ac 3 Pe 7 Stability Impact Line «¬29

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Erosion Impact Line 3 7 r 3 e iv R 4 e c a 4 e 4 P Flood Impact Line 7 4 7 7 3 3 4 3 7 3 7 7 7 3 3 3 3 4 3

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7 3 Peace Canyon Dam 7 3 3 7 7

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L Preliminary Impact Lines Agriculture Map Notes: Legend 0 0.5 1

Index B .

E 1. Datum/Projection: NAD83/UTM Zone 10N. Preliminary Flood Impact Line

C Agriculture Utility Class

R Proposed Reservoir . 2. Orthophotos created from 1:40,000 scale photography km

T B taken Sept, 2007; 1:20,000 scale photography taken High «¬29 A Preliminary Erosion Impact Line 12 June, 2007; TRIM., Bing Maps Aerial 2012 Peace River Valley Definition 13 Fort St. John Moderate 11 .! 3. Proposed maximum normal reservoir level (full supply Preliminary Stability Impact Line 9 10 14 15 level-461.8m) from Digital Elevation Models (DEM) 16 18 Taylor Highway 29 Low 8 17 19 generated from LiDAR data acquired July/August, 7 .! 2006. The surface area of the reservoir will change 6 20 26 21 22 over time after reservoir filling as a result of shoreline Access Routes Agriculturally Improved Preliminary Impact Lines, 5 23 24 25 4 erosion and deposition of sediment. Capability Class (eg. with irrigation) Highway 29 Realignments & 3 4. Preliminary flood impact line is based on an elevation .!2 «¬97 of 466 m and is only shown when located outside of (1) Capability Class 1-7 (Dominant) Agriculture Assessment the preliminary erosion impact line. 1 Hudson's 5. Exact extent of Hudson's Hope Berm yet to be determined. Unimproved Capability Class Date March 2013 DWG NO 1016-C14-B6192 R 1 Hope 6. The amount of water level fluctuation downstream of the proposed dam will be dependent on factors 1 Capability Class 1-7 (Dominant) The Site C Clean Energy Project requires environmental certification and other regulatory permits and approvals such as the flow volume, depth, width and slope of the river. before it can proceed to construction. The information presented in these maps reflects current planning for the © BC Hydro 2013 – all rights reserved. This map is for information purposes only and accuracy is not guaranteed. Site C Clean Energy Project and is subject to change as the project continues to be further defined. .! .!