1. OVERVIEW OF PROPOSED WORK ACTIVITIES

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1 Design and Construction Report #2 30 of DRRCGPR OVERVIEW OF PROPOSED WORK ACTIVITIES 1.1. Proposed Wors An overview of the proposed wors described in this DCR is provided below. DCR #2 includes the construction of 21 structures and 3 stream realignments. Structures include both bridges and culverts located in Segments A1, A3, A4, A5 and B1. Stream realignments include a tributary of East Duffins Cree in Segment A1, a tributary of West Oshawa Cree in Segment A4, and a tributary of Lynde Cree in Segment B1. The locations of the proposed structural and stream realignment wors in this DCR are shown in Figure 11. The proposed structures and stream realignments will be constructed in advance of the roadwor construction, which will be presented in future DCRs, and are part of the overall construction staging implementation strategy for the. The purpose of this approach is to provide efficiencies with regard to the required earth grading and haulage operations for the. Drawings of the proposed wors are provided in Appendix A Structures The proposed bridges and culverts in this DCR are presented by segment. Segment A1 Sideline 14 Bridge (Structure M11), which carries Sideline 14 over the East Phase 1 mainline, located approximately 1 m west of Westney Road and lies west of Spring Cree. East Duffins Cree Tributary Culvert (Structure M14) to allow for the crossing of the mainline over the tributary of East Duffins Cree, located approximately 350 m west of Westney Road. East Duffins Tributary Culvert (Structure M15) to allow for the Westney Road crossing over the tributary of East Duffins Cree. Westney Road Bridge (Structure M16), which carries Westney Road over the Highway 407 mainline. Salem Road Bridge (Structure M19), which carries Salem Road over the mainline.

2 Design and Construction Report #2 31 of DRRCGPR Segment A3 Cochrane Street Bridge (Structure M38) which carries Cochrane Street over the mainline. Baldwin Street Bridge (Structure M42) which carries Baldwin Street over the Highway 407 mainline. Lynde Cree Tributary B Culvert (Structure M44) to allow for the Phase 1 mainline crossing over Lynde Cree Tributary B, located approximately 890 m east of Baldwin Street. Thicson Road Bridge (Structure M46) which carries Thicson Road over the Highway 407 mainline. Segment A4 Pringle Cree Tributary Culvert (Structure M47) to allow for the East Phase 1 mainline crossing over the tributary of Pringle Cree, located approximately 420 m east of Thicson Road. Winchester Road Bridge (Structure M50), which carries the mainline over Winchester Road. Oshawa Cree West Tributary A Culvert (Structure M51) to allow for the mainline and Simcoe Street interchange ramp crossings over Tributary A of Oshawa Cree West. Oshawa Cree Tributary B Culvert (Structure M52) to allow for the Simcoe Street crossing over Tributary B of Oshawa Cree West. Simcoe Street Bridge (Structure M53), which carries Simcoe Street over the Highway 407 mainline. Segment A5 Oshawa Cree East Tributary Culvert (Structure M54) to allow for the East Phase 1 crossing over the tributary of Oshawa Cree East, located 900 m east of Simcoe Street. Oshawa Cree East Tributary Culvert (Structure M56) to allow for the East Phase 1 crossing over Tributary C of Oshawa Cree East, located 300 m east of Ritson Road.

3 Design and Construction Report #2 32 of DRRCGPR Segment B1 Highway 401 Bridge (Structure W6), which carries Highway 401 over Lynde Cree Tributary A, located within the of WDL/Highway 401 interchange. Highway 401 West WDL North Ramp Bridge (Structure W7) to allow for the Highway 401 West WDL North Ramp crossing over Lynde Cree Tributary A and Highway 401. WDL North Highway 401 East Ramp Bridge (Structure W9) over Highway 401. Highway 401 Bridge (Structure W10), to allow for the Highway 401 crossing over Lynde Cree Main Branch, located approximately 900 m east of the WDL. The WDL/Dundas Street West Bridge (Structure W12), which carries Dundas Street West over the WDL Stream Realignments The following stream realignments are proposed, using natural channel design principles to restore and enhance fish habitat; m realignment of tributary of East Duffins Cree from Westney Road in a southerly direction crossing the mainline, associated with Structures M14 and M15; m realignment of Tributary A / B of Oshawa Cree West from approximately 100 m east of Simcoe Street in a westerly direction under Simcoe Street and then south under the mainline, associated with Structures M51 and M52; and m realignment of Lynde Cree Tributary A within the WDL/Highway 401 interchange, associated with Structures W6 and W Other Related wors Other related wors to support the proposed construction of the structures and stream realignments include: Installation of erosion and sediment control measures according to the Erosion and Sediment Control Plan for the proposed wor elements and as identified as a condition of the ESA Permits (AUC01211, AUC00512, AUC00111, AUC00211) for the ; Construction of temporary access routes from municipal roads to structure locations within the highway ROW, as required; Placement of fill material for road approaches to bridges;

4 Design and Construction Report #2 33 of DRRCGPR Localized site preparation to allow for material and equipment storage and laydown areas within the highway ROW to facilitate construction; Relocation of local utilities at Sideline 14, Westney Road, Salem Road, Baldwin Street Thicson Road, Winchester Road, Thornton Road, Simcoe Street, Baldwin Street and Dundas Street to the accommodate structural wors; Construction of temporary drainage wors, including ditches and culverts, to address localized drainage conditions within the ROW at the structure and stream realignment sites; and Excavation of permanent stormwater management ponds to function as temporary settling ponds for treatment of any sedimentladen runoff. Although listed sequentially, the construction of the stream realignments and structural wors described in this DCR may be undertaen simultaneously in an effort to minimize the duration of construction. The following sections of this DCR are organized as follows: Section 2 and Appendices B and C outline input received from public, agency, and staeholder consultation and First Nations engagement; Section 3 details the specific wors associated with this DCR; Section 4 presents the identified impacts and mitigation measures and commitments associated with the wors; and Section 5 summarizes overall project environmental monitoring. The Detail Design for the remaining components of the will be addressed in future DCRs.

5 Phase 1 Deferred Interchange Phase 1 Deferred Ramp Roads 6 Lane Section Watercourses 4 Lane Section Waterbody Broc Street Rossland Road East Lynde Cree Site 51 / 51A / 51C W6 Highway 401 GO Transit / CN Rail Dundas Street East Scott Street Ash Street Dundas Street West King Street East King Street West STA TIO STATION Salem Road Kingston Road East AJAX W12 Harwood Avenue South a Cr e e OSHAWA W7 W9 W10 Ü Structures Railway Harmony Road North Thornton Road North Conlin Road M54 Osh aw M47 le C re e M50 Winchester Road East REGION OF DURHAM Rossland Road N 14 Harwood Avenue North ROSSLAND ROAD CP Rail Line HWY 401 / WEST DURHAM LINK SEGMENT B2 STATION SEGMENT B1 ( Simcoe Street North M44 Legend Phase 1 Interchange M53 M51 Prin g Garden Street ree ec Ly nd M46 WHITBY STATION STATION STATION STATION Coronation Road Halls Road North Lae Ridge Road Kinsale Road Westney Road Concession Road 5 M56 M52 s Site t O 33 es W Oshawa Cree Site 32 Oshawa Cree Thicson Road North PICKERING M42 TAUNTON ROAD SEGMENT B3 East D uffin s Cree WEST DURHAM LINK Church Street North sto Winchester Road West Highway 7 ree West Oshawa Cree g Kin oad nr M19 ac Taunton Road West Kingston Road West Finch Avenue STATION Paddoc Road Sideline 16 Road Broc Road Cr ee M38 w ha Columbus Road East Goodman Cree go n Columbus Road West e Cre e ia HARMONY ROAD wa Ga na ts SIMCOE STREET N Corbett Cree Concession Road 3 BALDWIN STREET a Osh Concession Road 4 STATION / WEST DURHAM LINK t We s e Cre Whitevale Road Concession Road 6 SEGMENT A5 Cre e e Urf re e M14 Site 10 East Duffins Cree SEGMENT A4 e Lynd am C Site 10A East Duffins Cree M15 M16 Spring Cree Brou gh M11 Salem Road Concession Road 7 SEGMENT A3 e Lynde Cre STATION WESTNEY / SALEM SEGMENT A2 Country Lane SEGMENT A1 STATION HIGHWAY 407 EAST PHASE Structures and Stream Realignments 2 m Date: 2013/02/04 Figure: 11 File Number: 0000 Rev.: Sub Code: 0000