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Title
Change Order/Amendment No. 5 with Hill & Wilkinson General Contractors for the New City Hall Complex in the amount of $140,448.25 for structural additions, landscape irrigation/drainage improvements, concrete changes, stair/fence railing provisions, fire alarm system integration, gabion wall modifications, wall system support, accessible door access controls, steel pipe casing, irrigation connections and electric vehicle charging equipment
Presenter
Andy Henning, Senior Building and Construction Projects Manager
Recommended Action
Approve
Analysis
On April 3, 2018 the City Council awarded the Construction Manager at Risk (CMAR) contract to Hill & Wilkinson General Contractors (18-7758) for pre-construction services in the amount of $5,000. This award provided for CMAR services including development of project estimates, preliminary construction schedules, value engineering proposals and constructability review during the Design Phase.
The current Change Order/Amendment No. 5 in the amount of $140,448.25 is divided as follows:
$23,076.31 for added teflon bearing pads clarified to be required by the detailing of the structural steel system, landscape and corresponding concrete revisions to improve drainage and storm water retention and extended fence system with handrails at added step location
$23,025.85 for integration of the new fire alarm system with the existing fire alarm system in city hall in order for the two systems to communicate seamlessly
$44,020.12 for gabion wall and concrete wall adjustments associated with the routing of the rain garden
$9,075.47 for miscellaneous steel lintels, angle supports and metal stud framing
$15,614.55 for the addition of ADA accessible push buttons with all necessary electrical and low voltage wiring and security system integration which will allow the new main entry doors to open automatically for those requiring assistance
$8,836.08 for steel encasement of an existing sanitary sewer pipe discovered to be at a higher as-built elevation while excavating for the rain garden
$4,631.27 for new 2” irrigation taps with associated piping, tapping saddle/valves and 2” meter box
$12,168.60 for installation of 3 dual electric vehicle charging stations for a total of 6 total charging positions
Change Order/Amendment No. 1 in the amount of $12,844,411 was approved by City Council on
October 16, 2018 (18-8351) for the Guaranteed Maximum Price (GMP) for the scope of work defined in the Rouch Architects Construction Documents package as competitively bid by Subcontractors to Hill & Wilkinson General Contractors. Costs above and beyond the Hill & Wilkinson portion of the project addressed in this Change Order/Amendment include previously approved Construction Manager pre-construction fees ($5,000); previously approved survey studies ($4,750); previously approved parking provisions ($200); previously approved communication equip/maint ($14,101); previously approved communication & video ($185,144); previously approved construction funding ($10,245); previously approved design/engineering/construction/geotechnical fees ($1,943,107); 5% contingency ($600,000); budget allowance for owner-provided furniture/fixtures/equipment ($923,000); allowance for construction testing ($75,000); allowance for audio/visual provisions ($185,000); allowance for IT/data design and installation ($100,000); plus an allowance for door access and security systems ($110,000), all of which total the overall phase one project budget of $16,999,958
Change Order/Amendment No. 2 in the amount of $176,260.93 was approved by City Council on February 5, 2019 (19-8645) and was comprised of the following:
$16,264.77 for concrete foundation and structural steel final coordination items
$66,220.87 for additional sanitary sewer piping at 4th Street in order to abandon and reroute an existing sanitary sewer line running under the current City Hall facility per the request of the Public Works Department
$21,404.98 for utility plan changes due to final architectural and MEP scope of work coordination
$48,983.42 for replacement of a deteriorated water line within 3rd Street up to the connection point at College Street per the request of the Public Works Department
-$23,548.82 for elimination of lightning protection from the new City Hall facility
$46,935.71 for storm drainage elevation adjustments to allow for an increase in pavement thickness of 2” at the new fire lane location
Change Order/Amendment No. 3 in the amount of $125,337.36 was approved by City Council on May 7, 2019 (19-8898) and was comprised of the following:
-$3,029.80 credit for elimination of gas piping installation by the construction team due to Atmos agreeing to run their piping a longer distance and installing the new gas meter adjacent to the building
-$15,199.14 credit for door and door hardware revisions following coordination work session with design team and construction team
$7,381.21 for capping of existing water line at College Street based on revised design and routing
$21,373.64 for tie-in of roof drain lines to below-grade storm system piping versus surface drainage
$17,055.66 for spare electrical conduits from new city hall electrical room to corresponding new parking area to allow for electric vehicle car charging stations planned
$17,172.60 for emergency generator modifications to allow for necessary advanced monitoring capabilities
$75,711.38 for added civil infrastructure required by Oncor for rerouting of primary power pathway
$4,871.81 for added weather-resistant power receptacles at the roof perimeter of the new city hall construction areas to coordinate with the holiday roof edge lighting planned
Change Order/Amendment No. 4 in the amount of $138,964.73 was approved by City Council on July 16, 2019 (19-9109) and was comprised of the following:
-$6,790.91 credit for removal of concrete piers below the new emergency generator slab in order to coordinate connection with the structural detailing of the existing emergency generator provisions
$1,519.52 for structural steel adjustments required for coordination with the metal pan stair system and guardrail/handrail extents
-$5,223.79 credit for use of an accent glazing material deemed to be an approved equal at a lower cost
-$12,014.70 credit for an alternate planting bed preparation method and deletion of Agriform plant food tablets not required by the landscape architect
$4,943.63 for back-painted glass on a clear anodized framing system at the main entry lobby
-$1,329.05 credit for shortening of the parapet wall at the north lower roof area and elimination of metal panels that were to be provided on the back surface of the parapet wall
$31,220.96 for carpet flooring quality/appearance upgrade and minimal wall tile and wood trim changes
$33,153.52 for added electrical panel and conduit pathway provisions for electric vehicle car charging within the new City Hall parking area
$17,432.79 for additional architectural guardrail/handrail system required by the building code
$76,052.76 for low voltage coordination with all City of Grand Prairie direct consultants consisting of Infinity Sound (audio/video), VTI (security) and FSG (data) along with conduit provisions for power and data required for the City of Grand Prairie new digital conference room reservation system
Items applicable to performance by the Construction Manager at Risk (CMAR) will be incorporated into the current Hill & Wilkinson General Contractors contract for a revised total contract amount of $13,430,422.27. Total percentage of change orders after approval of the current Change Order/Amendment 5 will be 4.52%.
This item was taken to the Finance and Government Committee on October 15, 2019 for their recommendation and approval.
Financial Consideration
Funding in the total amount of $140,448.25 is available in Municipal Facilities Capital Projects Fund (405090) WO #01801603 (Municipal Complex) Contract 324340 Contingency Line 3