Appendix C. 5% Design Plan and Profile Drawings/ Additional Design Information. South Oak Cliff Corridor Blue Line Extension

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1 Appendix C 5% Design Plan and Profile Drawings/ Additional Design Information The 5% plan and profile drawings were provided in a separate volume with the Draft Local EA and have not changed. Hard copies are available for review at study area libraries and at DART Headquarters. An electronic PDF version is available for viewing on Final Local Environmental Assessment C 1

2 ADDITIONAL DESIGN INFORMATION The following information was developed after the issuance of the 5% Preliminary Engineering (PE) drawings provided with the Draft Environmental Assessment (EA). The 5% PE package is not being modified for this Final EA; however, some of the information discussed below has resulted in design refinements that are addressed in this Final EA and will be carried forward into final design. Exhibit 1 Geothermal Wells and Police Driveway Relocation Exhibit 2 Ledbetter Station Platform Extension and Level Boarding Modifications Concept Exhibit 3 Ledbetter Station Architectural Site Plan Changes Exhibit 4 Oncor Transmission Lines Crossing and Steel Pole Assessment C 2 Final Local Environmental Assessment

3 GEOTHERMAL WELLS AND POLICE DRIVEWAY RELOCATION After issuing the 5% PE drawings, DART was informed that multiple geothermal wells exist in the landscaped area on the east side of the Dallas South Central Police Station between the police station building and Patrol Way. This area is where the proposed bridge structure for the South Oak Cliff Corridor Blue Line Extension project is located. As built drawings showing the geothermal wells were subsequently received from the City of Dallas. The actual configuration of the geothermal wells was estimated based on coordination with engineers and contractors involved with the geothermal well installation and will need to be verified as part of additional subsurface utility investigation (SUE) during final design. The attached exhibit shows the estimated location of the geothermal wells, and also shows proposed modifications to the 5% design. The proposed design avoids the geothermal wells, and also includes relocation of the northern police station driveway in order to increase the vertical clearance over the driveway from between the foot clearance discussed in the Draft EA to a new clearance of 15.8 feet described in this Final EA. The second exhibit includes a cross section showing that the total structural depth of the bridge structure above the driveway can be decreased in order to provide the 15.8 foot vertical clearance at that location. Also, moving the driveway south would allow for installation of bridge piers in locations outside the anticipated geothermal well areas near the driveway. Final Local Environmental Assessment C 3

4 SOC3-CC1-0010b-GEO /27/2012 5:01:29 PM SMH CLEARANCE CLEARANCE MIN DWG No. RELOCATE 12" WATER LINE 11/27/2012 I:\Projects\_SOUTH\GPC 5\TO 24 SOC-3 PE-EA\EXHIBITS\Geo Wells Exhibits\SOC3-CC1-0010b-GEO TS ROW 510 SMH FH SC TS " (TYP) DALLAS8" PVCSS EXISTING GEOTHERMAL WELL (TYP.) (SEE NOTE 5) DALLAS12" PVCW SC SOC-3 NB SOC-3 SB 8-6" (TYP) CONSTRUCT NEW CURB INLET DALLAS 24" RCP SD PIER OFFSET FROM CENTER OF BRIDGE (SEE NOTE 4) DALLAS36" RCPSD FH RELOCATE FIRE HYDRANT 80 ROW RELOCATE DRIVEWAY EXISTING GEOTHERMAL WELL (TYP.) (SEE NOTE 5) SOC3-CC SOC3-C AS REQUIRED IN AREA OF PROPOSED BRIDGE PIERS ADJACENT TO PATROL WAY. PROPOSED ROW DALLAS8" PVCSS 490 DALLAS12" PVCW SOC-3 NB SOC-3 SB PROPOSED ROW PIER OFFSET FROM CENTER OF BRIDGE (SEE NOTE 4) DALLAS SOUTH CENTRAL POLICE STATION RCP 15-6" (TYP) SD DALLAS 48" ONCORUGE12.5 KV 490 RCP DALLAS SD 24" 24" CS RCP CS NOTE: HORIZ VERT SOC3-C (SB) SOC3-CC (NB) Rc= Rc= Ls= Lc= Ea= Eu= V= " 1.53" 30 MPH SCALE (IN FEET) SCALE (IN FEET) Ls= Lc= Ea= Eu= V= " 1.49" 30 MPH 1. SEE DWG. No. CC FOR ADDITIONAL NOTES. 2. LOSS OF PARKING SPACES AT THE DALLAS POLICE SUBSTATION MUST BE MITIGATED PRIOR TO CONSTRUCTION. FINAL DESIGNER MUST COORDINATE FURTHER WITH THE CITY OF DALLAS AND DART TO DETERMINE THE LOCATION AND CONFIGURATION OF REPLACEMENT PARKING SPACES, DRIVE AISLES AND OTHER SITE IMPROVEMENTS AFFECTED BY THIS PROJECT. chad_allen_v8i $$MODEL$$ PROPOSED T/R ELEV EXISTING GROUND ELEV STA END CAMP WISDOM STATION VPC % ex = 0.78 K = 108 LVC= 260 EL PVI EL VPT EL % VPC EL INVERTED TEE TX28 PIER CAP PROPOSED TOP OF RAIL ex = K = 113 LVC= 440 BEAM EXISTING ENTRANCE EXISTING PROPOSED DRIVEWAY DRIVEWAY EXISTING GROUND PVI EL MINIMUM REQUIRED VERTICAL CLEARANCE OF 16.5 FEET ACCORDING TO DART DESIGN CRITERIA IS NOT BEING PROVIDED OVER THE NORTHERN DRIVEWAY CONNECTION TO THE DALLAS SOUTH CENTRAL POLICE STATION. A DART DESIGN EXCEPTION WILL BE REQUIRED DURING THE FINAL DESIGN EFFORT IF DART AND THE CITY OF DALLAS AGREE TO LEAVE THE DRIVEWAY OPEN, OR THE DRIVEWAY MAY BE CLOSED AND DEMOLISHED AS PART OF THE PROJECT. IF THE DRIVEWAY IS REMOVED, REPLACEMENT ACCESS MAY NEED TO BE PROVIDED FROM CAMP WISDOM ROAD AT THE WEST SIDE OF THE POLICE STATION PROPERTY. ADDITIONAL COORDINATION WITH THE CITY OF DALLAS AND DART ABOUT THIS ISSUE IS REQUIRED PRIOR TO COMPLETION OF THE FINAL DESIGN PROCESS. 4. CRASH PROTECTION MAY BE REQUIRED FOR ROAD ADJACENT TO PROPOSED BRIDGE PIERS. FINAL DESIGNER TO DETERMINE IF CRASH PROTECTION IS REQUIRED PER CITY OF DALLAS CRITERIA. THE EXISTING SIDEWALK AT EACH PIER LOCATION WILL NEED TO BE RECONSTRUCTED AND REROUTED AROUND THE PIER. 5. THE LOCATIONS OF THE GEOTHERMAL WELLS SHOWN ON THIS SHEET ARE APPROXIMATE AND ARE BASED ON RECORD DRAWINGS PROVIDED BY THE CITY OF DALLAS. THE FINAL DESIGN TEAM SHALL FIELD VERIFY THE THE LOCATIONS OF THE GEOTHERMAL WELLS IN THE VICINITY OF THE PROPOSED BRIDGE PIERS PRIOR TO ISSUING FINAL CONSTRUCTION PLANS FOR THE PROJECT. THE LOCATIONS OF SOME OF THE PROPOSED BRIDGE PIERS MAY NEED TO BE ADJUSTED, OR DART AND THE CITY OF DALLAS MAY DECIDE TO RELOCATE SOME OF THE GEOTHERMAL WELLS AFTER THEIR LOCATIONS HAVE BEEN MORE ACCURATELY DETERMINED. NOT AN APPROVED DRAWING PRELIMINARY ENGINEERING 5% DESIGN CONTRACT SHEET No. IN-PROGRESS THIS DOCUMENT IS RELEASED FOR THE PURPOSE OF REVIEW UNDER THE AUTHORITY OF: CHAD ANTHONY ALLEN, P.E. NO ON 11/27/2012 URS CORPORATION TBPE ID #F NORTH STEMMONS FREEWAY SUITE 6000 DALLAS, TEXAS URS CORPORATION TBPE ID #F-3162 DART PROJECT SCALE DRAWN DESIGNED CHECKED IN CHARGE DATE AS SHOWN C. KESTILA C. KESTILA/J. YEOW C. ALLEN P. ZHAO 27 NOV 12 LIGHT RAIL TRANSIT SYSTEM LINE SECTION SOC-3 GEOTHERMAL WELL EXHIBIT 1 OF 2: GUIDEWAY PLAN AND PROFILE STA TO STA REV AMEND CR DATE DESCRIPTION BY ENG CHK APP IT IS NOT TO BE USED FOR CONSTRUCTION, BIDDING, OR PERMIT PURPOSES. c DART, all rights reserved, CONTRACT DWG No. REV I:\Projects\_SOUTH\GPC 5\TO 24 SOC-3 PE-EA\EXHIBITS\Geo Wells Exhibits\SOC3-CC1-0010b-

5 SOC3SX03-GEO /27/2012 3:54:17 PM " = 1-0" DWG No. 11/27/2012 I:\Projects\_SOUTH\GPC 5\TO 24 SOC-3 PE-EA\EXHIBITS\Geo Wells Exhibits\SOC3SX03-GEO " 3-6" 10" DRIP GROOVE (TYP) EDGE OF DECK CONCRETE (TYP) NB 8" LOW POINT MIN HIGH POINT BRIDGE TOP OF LOW RAIL LOW POINT 40:1 40:1 40:1 40:1 BEARING 33-2" LEVEL (TYP) CATENARY POLE, NIC SB PGL 4-3" 4-3" 8-8" 4-3" 4-3" EDGE OF DECK CABLE TROUGH HAND RAIL, TYP TEXAS DOT TX28 I-GIRDER (TYP) 4-10" APPROX. HANDRAIL 6-0" 3-0" 6-6" PEJ 6-0" min. 6-0" min. FINISHED GRADE FINISHED GRADE 1-0" MIN 6-6" min. DRILLED SHAFT 1-0" MIN 6-6" min. DRILLED SHAFT DIA DIA PIER PIER TYPICAL SECTION SCALE: "=1-0" 1 ELEVATION SCALE: "=1-0" 2 chad_allen_v8i $$MODEL$$ STA TO STA STA TO STA NOT AN APPROVED DRAWING PRELIMINARY ENGINEERING 5% DESIGN CONTRACT SHEET No. IN-PROGRESS THIS DOCUMENT IS RELEASED FOR THE PURPOSE OF REVIEW UNDER THE AUTHORITY OF: B.W. ISAAC HWANG, P.E. NO ON 11/27/2012 URS CORPORATION TBPE ID #F NORTH STEMMONS FREEWAY SUITE 6000 DALLAS, TEXAS URS CORPORATION TBPE ID #F-3162 DART PROJECT SCALE DRAWN DESIGNED CHECKED IN CHARGE DATE C. KESTILA C. KESTILA I. HWANG C. ALLEN LIGHT RAIL TRANSIT SYSTEM LINE SECTION SOC-3 GEOTHERMAL WELL EXHIBIT 2 OF 2: TEXAS DOT TX28 I-BEAM 27 NOV 12 TYPICAL SECTION 3 REV AMEND CR DATE DESCRIPTION BY ENG CHK APP IT IS NOT TO BE USED FOR CONSTRUCTION, BIDDING, OR PERMIT PURPOSES. c DART, all rights reserved, CONTRACT DWG No. REV I:\Projects\_SOUTH\GPC 5\TO 24 SOC-3 PE-EA\EXHIBITS\Geo Wells Exhibits\SOC3SX03-GEO.00

6 LEDBETTER STATION PLATFORM EXTENSION AND LEVEL BOARDING MODIFICATIONS CONCEPT The anticipated extension and level boarding improvements at Ledbetter Station have been modified since the issuance of the 5% PE drawings for the project. A study is being conducted of existing platforms on the DART Red and Blue Lines in order to provide consistency with future extension and level boarding modifications throughout the LRT system. As part of the study, the plans for Ledbetter Station have been revised to incorporate a proposed canopy in the extension area and a shortened ramp length on the north end of the existing platform. The attached concept drawing shows these improvements relative to the existing conditions at the platform. C 6 Final Local Environmental Assessment

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8 LEDBETTER STATION ARCHITECTURAL SITE PLAN CHANGES Additional coordination has been performed with TxDOT about the Ledbetter Station site improvements currently shown in the 5% PE drawings for the project. It was determined that the previously proposed northbound left turn lane into the proposed kiss & ride area from Lancaster Road was too short and did not meet TxDOT design criteria. As a result, a new location for the kiss & ride area has been developed in coordination with TxDOT. The kiss & ride area is now envisioned to be located between Shellhorse Street and 56 th Street. Kiss & ride vehicles would enter at Shellhorse Street, drop off on a lane parallel to the bus lane, and exit south of 56 th Street. A revised architectural site plan is attached to show the new improvements. C 8 Final Local Environmental Assessment

9 GUARDRAIL, TYP NEW PLANTERS "ABOVE RAMP RAMP "ABOVE "ABOVE 22 WIDE 4.8%SLOPED SIDEWALK NEW PLANTERS STEPS TO RAISED PLATFORM 22 WIDE 4.8% SLOPED SIDEWALK 8"ABOVE GUARD RAIL KISS AND RIDE BUSES ONLY 22 WIDE 4.8% SLOPED SIDEWALK STEPS TO RAISED PLATFORM "ABOVE ONLY ONLY ONLY GUARDRAIL, TYP NEW LANDSCAPE TRAFFIC SIGNAL LANCASTER ROAD TRAFFIC SIGNAL LANCASTER ROAD TRAFFIC SIGNAL LEDBETTER SITE STUDY LEVEL BOARDING PLATFORM 1201 Elm Street Suite 5240 Dallas, TX T F TBPE REGISTRATION No. F NORTH STEMMONS FREEWAY SUITE 6000 DALLAS, TEXAS URS CORPORATION ID #3162 DART PROJECT R SCALE DRAWN DESIGNED CHECKED IN CHARGE DATE AS SHOWN G. BRINGAS V. SADR J. LIBURY D. JAMES 26 NOV 12 SOUTH OAK CLIFF 3 BLUE LINE EXTENSION PE/EA LEDBETTER STATION SITE LAYOUT STUDY REVISED c DART, all rights reserved,

10 ONCOR TRANSMISSION LINES CROSSING AND STEEL POLE ASSESSMENT Additional coordination was conducted with Oncor about the proposed crossing under the transmission lines south of Camp Wisdom Road near Runyon Springs Branch Creek. Oncor has analyzed the crossing and has provided the attached drawing showing the steel pole modifications anticipated to be required as part of this project. Oncor currently believes it will be necessary to raise three nearby steel poles in order to provide the vertical clearance required over the proposed South Oak Cliff Corridor Blue Line Extension tracks. This includes the poles immediately adjacent to and on either side of the rail crossing and one additional pole to the east. All wires between the three poles and between these poles and the two adjacent outside poles will be required to be adjusted and raised. This assessment is based on the track profile currently shown in the 5% PE drawings that were issued with the Draft EA. The possible lowering of the track profile to reduce the extent of pole modification has not yet been assessed and was not considered at the time. Final design efforts may examine lowering the profile to minimize pole and wire modifications. C 10 Final Local Environmental Assessment

11 90 STEEL POLE 95 STEEL POLE 85 STEEL POLE CONDUCTOR SHOT