10-28-2013 Council Work Session Packet

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0 MEMORANDUM TO: CITY COUNCIL FROM: JESSE STRUVE, PE SUBJECT: REST POINT ROAD UPDATE DATE: 10/28/13 CC: According to the 2011 Updated Pavement Improvement Plan, Rest Point Rd is classified as in need of a full reconstruction. At the August 26, 2013 City Council meeting, the Council directed staff to analyze the condition of the soils under Rest Point Rd and to present the results at a later council meeting. As part of the 2013 Forcemain Replacement Project, construction crews dug access pits to replace the forcemain on Rest Pt Rd. These pits allowed Dave Martini (Bolton & Menk) and me to get a visual inspection of the soil conditions under the existing road. The pits showed three distinct layers of material (see attached photo): 1. Existing road section (approx 12"thick). 2. Darker color silty/sand layer(approx 2' thick) 3. Clay layer. The existing road section consists of two separate asphalt layers separated by approximately 4" of gravel. Samples of the darker silty/sand later were taken and sent to Braun Intertec for testing. Based on the testing results and visual inspection, I am recommending Rest Point Road be reclaimed to 12", 3.5" of material be removed, and then 3.5"of new asphalt be installed. Reclaiming to 12" will incorporate both layers of asphalt which will combine everything into a,new granular base. One of the goals of the project would be to not raise the elevation of the roadway. This would be accomplished by removing 3.5"-4"of reclaimed material and then insta113.5"of new asphalt. Furthermore, it would be recommended to include Rest Point Circle in the reclamation project. Rest Point Circle received an overlay approximately 8-10 yrs ago, but it was in rough condition prior to the overlay. An overlay is usually intended to only last 5-S yrs, and while Rest Point Circle is in satisfactory condition, the underlying condition of the road could use improvement. The estimated cost to reclaim Rest Point Road (including engineering and contingency) is approximately $80,000, while the cost to reclaim Rest Point Circle is approximately $35,000 (including engineering and contingency). The City would save about a $5,000 in mobilization and traffic control costs by combining the projects versus waiting and doing Rest Point Circle at a later date. Attachments: • Photos of access pit and soil conditions.