(11)AR 111610 Agua Mansa Road Widening Project

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Staff Report to the Mayor and City Council Agua Mansa Widening Project Phase I Project November 16, 2010 Page 2 During the design phase of this project, copies of the project plans were forwarded to the utilities with infrastructure along or near Agua Mansa Road. Utility relocation activities were postponed due to a variety of reasons, primarily resulting from personnel changes at the various utilities, whom were originally contacted and informed of this project's 2006 construction schedule. Upon moving the project back into construction we were informed of the delayed planning efforts and made accommodations with the Contractor to ensure the needed utility relocations and installations occurred before the street improvements. The following utility work was completed before the Contractor completed final grading for the project: installation of a new water main line for West Valley Water District (WVWD), relocation of transmission lines and removal of poles by Edison, installation of utility conduits and Colton Electric vaults for the AMB Properties project, and relocation of a Southern California Gas line. The Contractor was mobilized three times and demobilized two times to accommodate the above noted work by the utilities, resulting in the time lapse since the contract award. During this utility installation and relocation period, additional traffic control measures were implemented to provide safety for commuters traveling through the project limits. Modifications to the project plans and schedule delays resulted in a Change Order in the amount of $269,859.97 (see Exhibit A). The increased costs reflected in the Change Order includes: additional traffic control and safety improvements, re -mobilization, survey and staking services, relocation and installation of steel guy power poles, removal of excess grading material, restoration of irrigation/sprinkler line, relocation and re -installation of chain link fence along RIX frontage, installation of retaining wall, and replacement of the chain link fence and relocation of water main service along Colton Electric power plant frontage. These additional items are discussed in more detail below. During the course of construction a significant amount of earthwork was required to correct for a conflict between a recorded Benchmark Elevation established by Colton and a recorded Benchmark Elevation established by the County of San Bernardino for this portion of Agua Mansa Road. This correction required fill and grading of 6,000 cubic yards of earth. The final elevation of the new roadway is higher than the preexisting elevation along this segment of Agua Mansa Road. To ensure security of the RIX Facility during the variant grade changes that had to occur during construction along its frontage, the property's chain link fencing was removed, installed at a temporary location during construction and reinstalled at its final location. Additionally, along the frontage of the Colton Electric Power Plant property the project plans depict replacement of a four foot (4 ft.) high chain link fence. This item was replaced with a six foot (6 ft.) high chain link fence to provide the property a perimeter fence that offers a similar height clearance from the new roadway elevation. Finally, a retaining wall was built due to steep slopes on the north side of Agua Mansa Road, approaching Riverside Avenue. The project has been satisfactorily completed as of November 12, 2010. Staff requests authorization to execute the project's final change order (Exhibit A) and file for recordation of this project's Notice of Completion (Exhibit B).