7.1 PRSR 01-12-2022 - Laserfiche WebLink

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Justin Femrite, PE December 14, 2021 City of Elk River Page 2 · Potential street signs along the right turn lanes would need to be evaluated for clearzone requirements. Street signs that impact the clearzone would be installed outside the trail to meet clearzone requirements. b. Space within the boulevard is needed for mailboxes while providing minimum clearzone for trail. Most street signs would be allowed within the boulevard area assuming adequate width is provided on either side of sign to meet the 2-foot clearzone requirement to the trail and a 10-foot clear area measured from the travel lane. c. Residential driveway impacts may increase to accommodate trail cross slope (max. 1.5%) constructed through driveways. 3. 10-foot-wide City Trail with a design section per Elk River Std Plate 2012 (2.5-inches bituminous and 6-inches aggregate base class 5). 4. A minimum 2-foot clearzone is required along either side of the trail. a. In areas of environmental concern or potentially large fill impacts to adjacent property, consider steepening the inslope to 1V:2H along the south side of the trail. i. This requires the clearzone to be increased from 2 feet to 5 feet, along with the consideration of adding a safety rail or fencing. ii. These areas include the Trott Brook crossing and existing wetland areas along the south side of CSAH 33 west of Quincy Road (Refer to cross sections attached with this memo). b. In several key locations, the conceptual grading impacts are relatively large and may severely impact existing wetlands. Additional design will be needed to review the potential for using retaining walls or potentially a 1V:1H reinforced soil slope (RSS) system. i. Additional soil borings would be necessary for this option. 5. Construct intersection lighting at the side street intersections (Auburn St, Yale St, Vance St, Smith St, Ulysess St, Qunicy Rd, and Brook St) to improve pedestrian safety. Construction Cost Summary Table 1 below summarizes the estimate construction costs for the CSAH 33 project and the additional costs for the City Trail. These estimated costs do not include additional costs for preliminary/final design or construction staking/administration, and costs for additional right-of- way or easements (temporary or permanent) as needed for the City Trail. A detailed copy of the estimated construction costs is attached with this memo. Table 1. Estimated Construction Cost Summary Description Estimated Cost CSAH 33 without trail $6,958,000 City Trail $1,370,000 Estimated Total Project: $8,328,000