Agenda - Council Work Session - 09/03/2013

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which is reflected in the estimated street maintenance costs shown inFigure 1 (attached). It should also be noted that over 45% of our streets were constructed in the 10 year period between 1976 and 1985. As such, staff recommends following a maintenance program that allows these streets to be maintained in such a way that they will not all need to be reconstructed within a 10 year period, thereby avoiding a large budget spike in the future. Notification: N/A - No notifications are required in association with this case. Observations /Alternatives: Updated Cost Estimates - As noted earlier, staff previously estimated $3,200,000 would be required annually to fund the city's long term street maintenance and reconstruction program to maintain our 142+ miles of non -MSA city streets at a PASER rating of 7 or better. This estimate was based on the following assumptions and unit costs. • Costs are based on maintaining 141.82 miles of non -MSA streets only • Assumed 40 year design life for all streets • 40 year maintenance costs included 4 crackseals /sealcoats, 1 overlay, and 1 reconstruction • Estimated crackseal /sealcoat unit costs = $29,406/mile = $1.56 /sq. yd. • Estimated overlay unit costs = $96,096/mile = $5.85 /sq. yd. • Estimated reconstruct unit costs = $1,000,000 /mile • Included 18% overhead costs As was also noted earlier, staff recently updated the cost estimates for our long -term street maintenance and reconstruction program, which included the following assumptions and unit costs, which are in many cases dramatically different from earlier assumptions and unit costs. Again, the updated estimate costs reflect the following regular maintenance schedule as outlined earlier including crack sealing all streets 3 years after initial construction, overlay, and reconstruction operations; concurrent crack sealing and seal coating operations should then occur in years 6, 13, 26, 33, 46, and 53, with an overlay and edge milling operation applied in years 20 and 40. Then, in approximately year 60, either a reclaim and repave project or a full reconstruction would occur, after which the maintenance cycle would begin all over again. The average 2013 costs associated with each of these treatments include $0.15 per square yard for crack sealing, $1.20 per square yard for sealcoating, $5.00 per square yard for a mill and overlay, and $50.00 per square yard for a partial /full reconstruction of the street. While some streets may only require partial reconstruction, which allows much of the curb and gutter to remain in place while the bituminous pavement section is removed and reclaimed and a new equivalent bituminous pavement section is installed. • Costs are based on maintaining all 174.1 miles of city streets, including 32.28 miles of non -MSA streets • Assumed 60 year design life for all streets • 60 year maintenance costs include 9 crackseals, 6 sealcoats, 2 overlays w/ edge mill, and 1 reconstruction • Estimated crackseal cost = $0.70/sq. yd. • Estimated sealcoat unit cost = $1.80 /sq. yd. • Estimated urban section overlay w/ edge mill unit cost = $13.50/sq. yd. • Estimated rural section overlay w/ edge mill unit cost = $11.00 /sq. yd. • Estimated urban section reclaim /repave unit cost = $22.00/sq. yd. • Estimated rural section reclaim /repave unit cost = $20.00 /sq. yd. • Estimated urban section reconstruction unit cost = $60.00 /sq. yd. • Estimated rural section reconstruction unit cost = $38.00 /sq. yd. • Includes 18% indirect costs for in -house work to prepare PSE, bid PS, contract admin, stake /inspect construction, prepare as- builts, etc. Per Council direction at the July 9th work session, the following assumptions were also considered when updating the estimated costs. 1. All streets shall be maintained and reconstructed "as is" with no changes to roadway design (number, width and /or configuration of lanes; traffic control measures; pavement material; etc.) or roadway type (urban vs. rural).