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Item 4GCITY OF SOUTHLAKI MEMORANDUM December 6, 2011 To: Shana Yelverton, City Manager From: Robert H. Price, P.E., Public Works Director Subject: Approve Amendment No. 2 to the Engineering Agreement with Nathan D. Maier Consulting Engineers Inc. for White Chapel Boulevard from Highland Street to SH 114 in the amount of $173,827 Action Requested: Approve Amendment No. 2 to the Engineering Agreement with Nathan D. Maier Consulting Engineers Inc. for White Chapel Boulevard from Highland Street to SH 114 in the amount of $173,827 Background Information: In October 2008, Nathan D. Maier Consulting Engineers, Inc. (NDM) was hired to design the North White Chapel Boulevard Improvement project from the intersection at State Highway 114 down to, and including, the intersection of Highland Street. The White Chapel Boulevard Improvement project design was for a standard four lane divided roadway with a raised and landscaped median. The original professional services agreement (design contract) in the amount of $264,859 included survey for the entire length of the project, design of the roadway, a hydraulic report of Dove Creek to properly size the proposed storm sewer box culverts near State Highway 114, determination of right of way needs and corresponding exhibits, geotechnical investigations to determine pavement design, and design for relocating existing water and sewer utilities within the corridor to accommodate the proposed roadway. The original design contract signed in 2008 was for the final design, bid documents and construction phase services of the White Chapel Boulevard Improvement project. NDM prepared and submitted conceptual design to the city for review of a conventional four -lane divided roadway using the existing centerline and taking right of way equally from both sides of the proposed roadway. It was later determined that the straight roadway alignment of White Chapel Boulevard should be shifted at the intersection of Highland Street so that no additional right of way will be required from the Southlake Church, due to the proximity of the existing building to the right of way. Since the property at the northwest corner of the intersection belongs to the City, there would also be a cost savings in the right of way acquisition by shifting the horizontal alignment of the roadway to the west. Supplemental Agreement No. 1, in the amount of $12,285 was approved by the City Manager in January, 2010 to revise the horizontal alignment of White Chapel Boulevard at the intersection of Highland Street to the west and add 2 feet of pavement on both sides of the road for bike lanes. The design fee for the revision also included revising the new typical sections of the roadway to include the additional 2' on each side of the road to accommodate bike traffic. NDM coordinated with design engineers for the White Chapel Countryside Office Park and made alignment recommendations for the city's waterline construction project along Highland Street, which is now complete. NDM had also revised the schematic layout at the intersection and submitted it to staff for review. Design had progressed to nearly 30% when the city suspended work on the roadway design to allow consideration of alternative traffic control methods at the Highland Street intersection. Traffic circulation issues at Carroll High School caused the staff to reconsider operation of the Highland Street intersection. Several different types of intersection control methods were evaluated to determine the most advantageous approach. A traffic engineering consultant looked at the costs and level of service (LOS) for two way stop control, four way stop control, traffic signal control, a single lane roundabout, and a dual lane roundabout. Staff has presented these options to members of the City Council and Planning and Zoning Commissioners at two Southlake 2030 work sessions. Summarizing those discussions, the two way and four way stop control intersection and the single lane roundabout will not efficiently handle the projected 2019 volume of traffic without excessive delay. Signal control would be useful during the morning and afternoon peak periods, but would not operate efficiently during the remainder of the day and would impose continuing maintenance and operation costs. The dual lane roundabout, does improve capacity at the intersection and creates the least delay for drivers of the options considered. Council and Planning and Zoning members of the 2030 committee directed Staff to move forward with the design of a dual lane roundabout at the intersection of North White Chapel Boulevard and Highland Street. Supplemental Agreement No. 2, in the amount of $173,827 is for the completion of design of White Chapel Boulevard along the revised alignment and will include a dual lane roundabout at the intersection of Highland Street. The revised scope as outlined in Supplemental Agreement No. 2 includes additional survey of up to 350' beyond the original limits of Highland Street and up to 500' north of Highland Street along White Chapel to accommodate the dual lane roundabout and the revised alignment of the intersection. The agreement also includes landscaping and irrigation design of the proposed roundabout and the center medians along White Chapel Boulevard. Subsurface utility engineering work will be performed in order to verify the location of existing water and sanitary sewer lines and any other private utilities within the corridor that will need to be relocated prior to beginning construction. The utility design includes the relocation of existing sanitary sewer mains which will be in conflict with the new pavement. The drainage design will need to be updated to incorporate the drainage from the new Countryside White Chapel Office Park development that has been constructed since the original drainage study was performed by NDM. Finally, the revised scope includes final engineering plans, traffic control and sequencing for construction, contract documents, bidding of the construction project and construction administration. Roadway Design $ 79,735 Survey Services 22,164 Drainage Design 7,254 Utility Design 4,654 Subsurface Utility Engineering 39,450 Landscaping and Irrigation Design 12,500 Construction Administration 2,640 Reimbursable Expenses 2,000 Right of way Exhibits 3,430 Total for Amendment #2 $173,827 The proposed amendment brings the total engineering design cost for the White Chapel Improvement Project from State Highway 114 to Highland Street to $450,971. The schedule going forward anticipates that design will be completed in the 4th quarter of calendar year 2012. Right of way documents will be available to begin acquisition in the 3 rd quarter of 2012 and right of way acquisition completed by the 1 St quarter of 2013. Relocation of the franchise utilities (electric, gas, phone, etc.) will begin when right of way is available and should be completed by the end of the 3rd quarter of 2013. Staff anticipates the construction to be awarded in the 4 quarter of 2013. Financial Considerations: Funds for the engineering design of the White Chapel Boulevard Improvement project are included in the previously approved Capital Improvements Program project budget. Strategic Link: The construction of the North White Chapel Boulevard Improvements project links to the city's strategy map relative to the focus areas of Mobility, Infrastructure and Performance Management and Service Delivery. The specific corporate objectives that are met by the construction of this project include: C2 - Provide travel convenience within the City and the region, B4 - Provide high quality customer service, and F2 - Invest to provide and maintain high quality public assets. Citizen Input/ Board Review: None Legal Review: None Alternatives: The City Council may approve the Amendment to the existing Professional Services Agreement or deny it. Supporting Documents: Location Map Nathan D. Maier Engineers, Inc. Supplemental Agreement No. 2 Staff Recommendation: Approve Amendment No. 2 to the Engineering Agreement with Nathan D. Maier Consulting Engineers Inc. for White Chapel Boulevard from Highland Street to SH 114 in the amount of $173,827 Staff Contact: Robert H. Price, P.E., Public Works Director Gordon J. Mayer, Jr., P.E., City Engineer Cheryl Taylor, P.E., Civil Engineer L L V ► � EXHIBIT SA -2 Supplemental Agreement No. 2 FOR WHITE CHAPEL BOULEVARD FROM E. NORTHWEST PARKWAY (S.H. 114) TO E. HIGHLAND STREET FOR THE CITY OF SOUTHLAKE, TEXAS This Supplemental Agreement No. 2 amends the original Scope of Services dated 10/14/08 to include additional modifications to the alignment and schematic design as previously submitted to The City of Southlake (The City) by Nathan D. Maier Consulting Engineers, Inc. (NDM). These modifications will realign the proposed roadway for approximately 1000 ft along White Chapel Boulevard to incorporate a roundabout at the intersection of White Chapel Boulevard and Highland Street. The proposed changes altering the original scope include: I. Topographic and Right -of -Way Survey Survey of existing topographic features will be performed for approximately 50 ft of additional width beyond previous topographic survey limits. This additional survey will have the following limits: • Along White Chapel Boulevard from Countryside Court to approximately 250 ft to the south. • Along White Chapel Boulevard from approximately 500 ft north of Highland Street to Highland Street. • The northwest and southwest corners of White Chapel Boulevard and Highland Street. • Along White Chapel Boulevard from Highland Street to approximately 350 ft to the south. • Along Highland Street from previous survey limits to approximately 350 ft to the west (100 ft width). • Along Highland Street from previous survey limits to approximately 150 ft to the east (within existing ROW). WHITE CHAPEL BOULEVARD 08/31/11 Page 1 Additional cross sections will be provided, as required by design, along Highland Street to the west of the adjusted White Chapel Boulevard intersection, as well as driveways affected by the adjusted White Chapel Boulevard centerline. Additional survey will be required upstream of the existing cross culvert to tie topographic features associated with the recent development of this property. The additional survey of existing features will include overhead power lines, telephone lines, cable TV lines and any other overhead features. Existing tower foundations and the elevation of the lowest wires and cables will be included. The topographic survey will also include, but not be limited to the location of dwellings, buildings, sheds, fences, streams, roads, utilities, and the outline of wooded or heavy brush areas, within the limits described. Any dwelling or structure adjacent to, but not more than 50 ft outside the limits of the work, will be included in the survey. Sufficient topographic data will be gathered to determine construction limits for driveways, cross streets and drainage channels. Additional survey will be gathered after the conceptual schematic has been approved by the City. The additional survey will be incorporated into the topography gathered during prior survey operations. Deed research will be updated for properties within the expanded limits of the topographic survey. Additional property and right -of -way surveys will be included for properties west of White Chapel Boulevard and south of Highland Street. One additional ROW staking will be field located for each affected property at the completion of construction or at a time to be determined by the City. IL Subsurface Utility Engineering (SUE) A Level B SUE will be performed for the project and will include test holes to existing water lines and sanitary sewer mains at twelve (12) locations to be verified. The utility mapping will be approximately 60 ft each side of the proposed centerline, 200 ft east and 400 ft west along Highland Street, and will include gathering and depicting both City and franchise utility information. This information will be incorporated into the existing utility mapping prepared during prior utility coordination and topographic survey activities. Test hole locations will be coordinated between NDM, the City, and the SUE provider after the utility mapping has been updated from the initial SUE investigations. Test hole locations will be associated with the following City utilities: • 12" water line running north and south generally within the existing White Chapel Blvd. pavement. Test hole operations for this utility will require traffic control measures and likely will require lane closures. • 20" water line running north and south and generally within the existing White Chapel Blvd. pavement. Test hole operations for this utility will require traffic control measures and will likely require lane closures. WHITE CHAPEL BOULEVARD 08/31/11 Page 2 • 12" water line running east and west generally within the existing Highland St. pavement. Test hole operations for this utility may require traffic control measures and may require lane closures. • 6" sanitary sewer force main running north and south generally between the existing White Chapel Blvd. pavement and the east ROW. Test hole operations for this utility should not require traffic control measures or lane closures. Additional test holes, expansion of the Level B investigation area, required closures of the entire roadway, and more than five (5) individual lane closures will be considered as additional services. I1I. Conceptual Schematic Design A conceptual schematic layout with plan and profile will be developed in roll plot format. Additional alignment modifications to White Chapel Boulevard will be included beginning at the south end of the project and ending approximately at Station 9 +75 at which point the original schematic alignment is matched. The alignment from this point to the north will be along the existing roadway alignment. The White Chapel Boulevard and Highland Street intersection will be shifted further to the west to incorporate the roundabout. The adjusted alignments and roundabout will be included as part of the schematic layout, as well as typical sections and preliminary right -of -way (ROW) requirements. The schematic will utilize existing aerial mapping and topography as a background. After approval by the City, the additional topographic survey, as detailed above, will be gathered. IV. Preliminary Design Conceptual roadway alignments and profiles will be adjusted per guidance from the City to incorporate a roundabout at the intersection of White Chapel Boulevard and Highland Street and to further develop the preliminary design. The profile with preliminary cross sections will consider existing adjacent land use, side street and driveway connections, and sight distance requirements at Highland Street. Existing water line and sanitary sewer elevations will evaluated for adequate clearances when developing the proposed profile. Pavement edges will accommodate a dual lane roundabout with median islands on the connecting streets. Layout of the roundabout intersection will follow the conceptual layouts provided by the City as closely as possible. Pedestrian access across each connecting roadway will include crosswalks and ADA compliant ramps. ROW requirements will be determined based on development of the preliminary cross sections. A truck apron will be provided at the roundabout. WHITE CHAPEL BOULEVARD 08/31/11 Page 3 Underdrain requirements for the roundabout will be evaluated and included as necessary. V. Landscape and Irrigation Design Landscaping will be provided for the roundabout, as well as for the medians along White Chapel Boulevard. Irrigation will be provided as required for proposed landscaped areas. All hardscape areas will be included in the landscape design and may include stamped concrete for crosswalks and stamped concrete or pavers for median areas. All landscaping and irrigation will adhere to a City - provided palette for colors and materials, as well as City standard details and design criteria. VI. Utility Design Utility layouts will be developed for the relocation and lowering of the existing sanitary sewer force main that will be in conflict with the new pavement section. It is assumed that the 20 inch water line will not require adjustments based on the information provided. Any adjustments to this line is beyond this scope of services. VII. Drainage Design Drainage area mapping and runoff computations will be revised to incorporate new development of the watershed upstream of the cross culvert. Preliminary sizing of this structure will also be revised for inclusion on the schematic. Proposed channel grading will be revised based on changes in the topography due to the new development. Preliminary grading will be included on the schematic. VIII. Traffic Control for Roundabout Additional layouts and details for the traffic control plan and sequencing of construction will be provided for the inclusion of the roundabout for anticipated additional phases of construction at this location. IX. Final Design The approved conceptual schematic and preliminary design will be drafted into final form and will include the new roundabout components. Additional typical sections and details will be prepared for the roundabout. A grading plan for the roundabout intersection will be prepared. WHITE CHAPEL BOULEVARD 08/31/11 Page 4 X. Construction Administration Construction Observations - With the increased length of the project to the south and to the west and with the additional design services provided in this supplemental, it is anticipated that the construction duration will be lengthened by one month. Changes & Reviews - The additional length and complexity of the project is anticipated to increase the amount of review and coordination with the City and contractor for services described in the original contract (Section XVIII, Paragraph E.). WHITE CHAPEL BOULEVARD 08/31/11 Page 5 EXHIBIT D Supplemental Agreement No. 2 For White Chapel Boulevard E. Northwest Parkway (S.H. 114) to Highland Street Engineering Fees DESCRIPTION ENGINEERING FEE BASIC SERVICES Roadway Design $129,639 TOTAL BASIC SERVICES $129,639 SPECIAL SERVICES Survey Services $35,170 Hydraulic / Hydrology Study and Analysis $25,485 Waterline Replacement $19,455 Permitting $11,160 Construction Administration $12,470 Geotechnical Investigation $8,000 Reimbursable Expenses $2,900 Unit Costs $20,580 12 - Right -of -way dedication exhibits / Easement dedication exhibits - $1,715 each TOTAL SPECIAL SERVICES $135,220 SUPPLEMENTAL AGREEMENT NO. 1 $12,285 WHITE CHAPEL BOULEVARD 08/31/11 Page 6 SUPPLEMENTAL AGREEMENT NO. 2 BASIC SERVICES Roadway Design SPECIAL SERVICES Survey Services Drainage Design Utility Design Subsurface Utility Engineering Landscape and Irrigation Design Construction Administration Reimbursable Expenses Unit Costs ($1,715 per unit) Additional ROW Dedication Exhibits Additional Easement Dedication Exhibits TOTAL FOR SUPPLEMENTAL NO. 2 TOTAL ENGINEERING $79,735 $22,164 $7,254 $4,654 $39,450 $12,500 $2,640 $2,000 $3,430 $173,827 $450,971 WHITE CHAPEL BOULEVARD 08/31/11 Page 7