Reso 2011-1743 - Laserfiche WebLink

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~=~ Kimley-Horn and Associates, Inc. Mr. Ken Jeffries, June 9, 2011, Page 3 accommodate the proposed sidewalk, as shown in Photo 12 of Attachment C. Further investigation is recommended. Additionally, the landscaped lawn island appears to serve as a retention area during storm events. Future design plans will need to address this issue to ensure that drainage in the area is not adversely impacted by the construction of the proposed sidewalk. The eastern edge of the proposed sidewalk will be at a higher elevation than the existing retention area. Therefore, the conceptual design includes the installation of a wall and associated railings within this area. The proposed sidewalk enhancements terminate at the existing curb ramp located on the east side of the Business Loop/NE 163rd Street eastbound intersection. Intergovernmental Coordination The City of Sunny Isles Beach was contacted regarding the proposed conceptual plan. City staff had no objection to the proposed improvements but stressed that the following items need to be coordinated with the City during the development of construction drawings: cap rock removal, landscaping removal and replacement, irrigation removal and replacement, the use of brick pavers in lieu of standard concrete sidewalks, and textured crosswalk treatment. It is noted that certain enhancements to the proposed improvements beyond FDOT's design standards may require additional funding from the City of Sunny Isles Beach. Opinion of Probable Cost An opinion of probable cost was developed for the conceptual improvements as summarized in Attachment H. Pay items were obtained from FDOT's most recent Basis of Estimates. Unit prices were was generally based upon the most recent version ofFDOT's Pay Item Cost History for Area 13. Furthermore, additional amounts were added to the project subtotal to account for mobilization; maintenance of traffic; clearing and grubbing; engineering, construction inspection, and permitting; contingencies; and a premium to account for the small size of the project. It should be noted that additional costs associated with potential drainage impacts were not included in the estimate. Future investigation of this issue is recommended to identify the potential additional costs. The preliminary estimated project cost is $142,000 for standard concrete sidewalks and crosswalk treatments. The project cost is estimated to increase to approximately $167,000 with brick paver sidewalks and textured crosswalk treatments. Please note these costs are based upon the concept plan and are subject to change as the design is further refined. Conclusion The existing pedestrian network in the area of Collins Avenue/SR AlA and NE 163rd Street/SR 826 warrants enhancement. The proposed concept plan, if implemented, would provide a continuous sidewalk facility along the west side of SR Al A within the intersection area and provide connectivity to the existing land uses within the Business Loop. As outlined in the conceptual plan, the most significant design and construction challenges for this project are as follows: . Required removal and replacement of existing landscape material, sidewalks, and irrigation within the intersection area. Future coordination with the City of Sunny Isles is recommended to address this issue during final design