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flisoaflTt Memorandum TO: Little Canada Mayor and City Council Members FROM: Lee Elfering, City Engineer DATE: September 8, 2011 RE: 2011 Street & Utility Improvements Change Order #1 Background Earlier this summer the City Public Works crews noticed water in the curb and on the bituminous pavement of Park Street north of Demont Avenue when all other streets were dry. Upon investigation there was a significant amount of water draining out of the boulevard hills on the east and west sides onto the street and the street subgrade itself was saturated to a point that water was coming up through the cracks in the pavement. This wet condition was causing the street to flex under traffic load and flexing was observed under foot traffic in the worst areas. The area has continued to be monitored and has remained wet most of the summer from groundwater seepage. It is likely that the condition was caused by the wet spring and early summer and the rainfall experienced through the summer months has been consistent enough to maintain the wet condition. It appears the area of concern is located approximately 200 feet north of Demont Avenue. The area is approximately 70 feet in length and the entire width of the Park Street, Based on the conditions we would recommend corrective action be taken prior to this winter to ensure the street remains in a drivable condition throughout the winter and next spring. We would recommend removal of the entire street section in this 70 foot long area and installation of draintile, 12- inches of sand and replacement of the street section and curb. The draintile would be run behind the curb to the catchbasins at the corner of Demont Avenue and Park Street. Park Street is currently scheduled for a mill and overlay project next year so we would propose to only pave the base lift of bituminous in the area of the street correction as part of the repair. The final wear course could be paved next year with the remainder of the street. We have spoken to the Contractor and they are willing to complete the work at the unit prices from the bid as listed on the attached change order cost summary sheet. Summary and Recommendations Change Order #1 is attached, which outlines the costs for the above changes. At this time we are requesting that the City Council approve Change Order #1 for a total amount of $18,820.07 to address Park Street. If you have any questions or would like to discuss this issue please feel free to call me at (763) 780 -0450 ext. 3. Z; \PROJ1120145E - 2011 Street & Utility Improvements10071 \Change Orders \Memo -090811 -CC (COtt 1 - Recon).doc 10062 Flanders Court NE — Blaine, MN 55449 — (763) 780 -0450 fax (763) 780 -0452 1