03/13/2017 City Council Agenda - Laserfiche WebLink

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Treatment Types and Estimated Costs For the purpose of reporting projected backlogs the Engineering Division provides construction costs based on historic and present road projects. Treatments reflected in the backlog analysis are limited to three types; slurry seal, overlay, and reconstruction and reporting is based on a system wide approach, not at the project level performed by Engineering. Each functional class has an estimated unit cost for overlay and reconstruction treatments. For local streets (FC -5) an additional maintenance option, slurry seal, is considered. Slurry Seal: The slurry seal option allows for a cost-effective treatment to seal the surface and restore the skid resistance of local street segments, which do not carry high traffic loads. This treatment is not used on streets which require strengthening or reconstruction. Typical slurry seal costs include street cleaning, removal of vegetation, minor base repairs (dig -outs), sealing of cracks, and application of an emulsified asphalt aggregate mixture to the entire paved surface. Associated costs include replacement of striping and pavement markings, and other work needed to return the street to normal operation. Overlay: Typical overlay rehabilitation costs include milling of existing pavement to a moderate depth to remove existing cracking and increase strength of the structural section. Isolated areas of severely distressed pavement are removed and replaced including a new aggregate base. Associated costs include replacement of striping and pavement markings, adjustment of manholes, and other work needed to return the street to normal operation. Reconstruct: Typical street reconstruction costs include removal of the existing pavement and base structural section and replacement with a new structural section which will meet a 20 -year design life. Isolated areas of curb and gutter are replaced where they would not be suitable to contain new paving or have severe drainage problems. The following table identifies the estimated costs for the various treatment types including costs to upgrade curb ramps to comply with The American with Disabilities Act (ADA). The slurry seal treatment is exempt from ADA requirements. 13 .......................................... i771 Overlay - FC 1 &2 $215,000 $243,000 $336,000.00 Overlay - FC 3 & 4 $184,000 $214,000 $311,000.00 Overlay - FC 5 $169,000 $195,000 $255,000.00 Re -Const - FC 1 &2 $765,000 $724,000 $892,000.00 Re -Const - FC 3 & 4 $677,000 $679,000 $884,000.00 Re -Const - FC 5 $505,000 $505,000 $649,000.00 Slurry Seal - FC 5 $19,000 $25,000 $44,000.00 13