The Attachments represent the Department’s concept and are considered to be reliable information developed for the project. The requirements of this project are included below in this RFP. Attachments do not constitute or represent a binding requirement of this contract unless specifically stated below and/or in subsequent sections of this RFP. 452356-1: The I-75 (SR 93) interchange at Sumter Blvd. within Sarasota County is to be improved via signalization of the north and south intersections, lighting of the intersections and all existing pedestrian crossings, and adding capacity to the northbound I-75 on-ramp from Sumter Blvd. The existing northbound I-75 on-ramp is single lane with a single left turn lane from Sumter Blvd. These improvements would provide lengthened dual left turn lanes from Sumter Blvd. and provide a two lane on-ramp onto northbound I-75. Sumter Blvd. is an arterial under the jurisdiction of the City of North Port. It is a 4-lane divided arterial with a design speed of 45 MPH. The existing typical section includes two 12-foot travel lanes per direction, a single 12-foot left turn lane, 10-foot paved shoulders and a concrete median. There is also guardrail to the outside of the 10-foot paved shoulder beneath the I-75 bridge. The proposed Sumter Blvd. typical section will include two 12-foot travel lanes southbound, a single 12- foot travel lane northbound, a 12-foot outside left turn lane and a 11-foot inside left turn lane. The existing 10-foot paved shoulders will remain, however, the existing guardrail will be removed and replaced with pier protection barrier. These typical section improvements to the pavement will be accomplished by reconstructing the existing concrete median and widening into the median to provide the second 11-foot left turn lane. The remaining pavement on Sumter Blvd. within the limits of the interchange will be milled and resurfaced for re-striping purposes. The northbound I-75 on-ramp is within the limited access R/W and is currently a single lane from northbound Sumter Blvd. and southbound Sumter Blvd. The design speed of the ramp varies. The existing typical section consists of a 15-foot ramp with a 4-foot paved inside shoulder and a 2-foot paved outside shoulder. Beyond the full inside and outside shoulder widths, 6-foot each, there is a tie down to existing ditch. The northbound I-75 off-ramp will also be realigned to ensure proper alignment with the new dual northbound I-75 on-ramp and reconstructed median. The proposed northbound I-75 on-ramp will include two 12-foot ramps, a 10-foot outside paved shoulder and a 4-foot inside paved shoulder. Beyond the full inside and outside shoulder widths, 8 feet and 12 feet respectively, there is a 1:4 minimum tie down to the existing regraded ditch. The existing northbound I-75 on-ramp from southbound Sumter Blvd. will remain a single lane but will be realigned to merge into the new dual lane on-ramp from northbound Sumter Blvd. The existing northbound I-75 off-ramp will also remain a single lane but will need to be realigned. These typical section improvements will be accomplished by widening to the inside and outside of the existing northbound I-75 on-ramp. The remaining pavement will be milled and resurfaced for re-striping purposes.
