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CIP Discussion 3/12/2009 Page 3 Afull depth mill is where the full depth of the pavement is ground up and removed. This process may also involve some sub grade soil corrections and some removal of aggregate base, if it has been contaminated or is sub-standard. The street is paved with the same thickness of new asphalt. Pavement can also be reclaimed, where approximately 8 to 10 inches of the existing asphalt and base are ground up in place. This forms a new more stable base without adding new material. The road is then paved with new asphalt. Application: Edge mill or full width mill is recommended for use on a street that has been constructed with a good base section, pavement that has more significant deterioration where a sealcoat would not be effective. Milling creates an even surface to ensure a uniform overall thickness to the new overlay. An asphalt overlay of 1.5 to 2 inches over the entire pavement width forms a smooth crown, renews the street surface, restores structural capacity and proper drainage, and extends the life cycle of the original pavement. Full depth mill or reclamation is recommended for use on a street that has already been constructed with a good base section, but the pavement has deteriorated to a point where seal coating or a standard mill and overlay is not effective. A pavement section with significant cracking will end up reflecting through the new pavement. Associated maintenance: Spot repairs of sub grade soil corrections, spot replacement of curb and gutter, man~ole/gate valve casting adjustments/repairs, underground utility work (with full depth mill or reclaim). Procedure: Reconstruction When a street is fully reconstructed, the existing asphalt and base are completely removed and replaced. Reconstruction may also involve sub grade soil corrections. Application: Recommended when there is not a good base section, if any utility work (sanitary sewer or watermain) under the roadway is required, or if drainage problems dictate modification of street grades to resolve drainage and/or street flooding issues. Associated maintenance: Underground utility work. Streets for reconstruction are selected based on a variety of factors, including, but not limited to: . Severe pavement deterioration (potholes, cracking, rutting, etc.) due to age and/or the lack of a good base section . Condition of underground water and sewer system . Condition/effectiveness of existing surface drainage system · Opportunities to improve water quality of lakes downstream of street . Available State and City funding