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Treatment Types and Estimated Costs <br />For the purpose of reporting projected backlogs the Engineering Division provides construction <br />costs based on historic and present road projects. Treatments reflected in the backlog analysis are <br />limited to three types;slurry seal, overlay,and reconstruction and reporting is based on a system <br />wide approach, not at the project level performed by Engineering.Each functional class has an <br />estimated unit cost for overlay and reconstruction treatments. For local streets (FC-5) an <br />additional maintenance option, slurry seal, is considered. <br />Slurry Seal:The slurry seal option allows for a cost-effective treatment to seal the surface <br />and restore the skid resistance of local street segments, which do not carry high traffic loads. <br />This treatment is not used on streets which require strengthening or reconstruction. Typical <br />slurry seal costs include street cleaning, removal of vegetation, minor base repairs (dig-outs), <br />sealing of cracks, and application of an emulsified asphalt aggregate mixture to the entire <br />paved surface. Associated costs include replacement of striping and pavement markings, and <br />other work needed to return the street to normal operation. <br />Overlay:Typical overlay rehabilitation costs include milling of existing pavement to a <br />moderate depth to remove existing cracking and increase strength of the structural section. <br />Isolated areas of severely distressed pavement are removed and replaced including a new <br />aggregate base. Associated costs include replacement of striping and pavement markings, <br />adjustment of manholes, and other work needed to return the street to normal operation. <br />Reconstruct: Typical street reconstruction costs include removal of the existing pavement <br />and base structural section and replacement with a new structural section which will meet a <br />20-year design life. Isolated areas of curb and gutter are replaced where they would not be <br />suitable to contain new paving or have severe drainage problems. <br />The following table identifies the estimated costs for the various treatment types including costs <br />to upgrade curb ramps to comply with The American with Disabilities Act (ADA).The slurry <br />seal treatment is exempt from ADA requirements. Beginning in 2016, construction costs will be <br />udated on a bi-annual basis. <br />Improved System <br />Updated Eng.Updated Eng.Updated Eng. <br />2006 cost2011 cost2016 cost <br />Overlay - FC 1 & 2$215,000$243,000$336,000.00 <br />Overlay - FC 3 & 4$184,000$214,000$311,000.00 <br />Overlay - FC 5$169,000$195,000$255,000.00 <br />Re-Const - FC 1 & 2$765,000$724,000$892,000.00 <br />Re-Const - FC 3 & 4$677,000$679,000$884,000.00 <br />Re-Const - FC 5$505,000$505,000$649,000.00 <br />Slurry Seal - FC 5$19,000$25,000$44,000.00 <br />11 <br /> <br />