05-10-2005 Council Agenda - Laserfiche WebLink

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Memo .EIfCRING . fiSSOCITIT -ES TO: Mayor Blesener & Members of the City Council FROM: Lee Elfering, City Engineer DATE: May 5, 2005 RE: Sanitary Sewer Replacement on County Road D As the Council is aware the Minnesota Department of Transportation (Mn /DOT) is reconstructing the Edgerton Street Bridge crossing Interstate 35E/694. In conjunction with the project the intersection of County Road D and Edgerton is also being improved. A review of the sanitary sewer system in the area has recently been completed. During the televising of the sanitary sewer the camera became completely submerged along major portions of the main line sewer between Payne Avenue and Edgerton Street which indicated that the main is sagging in locations. It is estimated that the sags in these 8- inch mainline runs are in excess of 6- inches and could be up to the height of the entire pipe. All other sanitary sewer lines within the project limits were in good condition. Upon review of the existing lines we would recommend that the City Council approve replacement of the existing sanitary sewer based on the following. 1. The construction within close proximity to the existing sanitary line may increase the severity of the sag that already exists. 2. Separation of pipe joints is typical in sags of this extent, resulting in groundwater infiltration. 3. The sanitary sewer repairs would be completed within the existing street reconstruction area already disturbed. Therefore no additional pavement restoration would need to be completed due to the sanitary sewer replacement work at this time. Due to the condition of these lines we requested that the Contactor (Frattalone) completing the work provide an estimate for replacement of 562 feet of the 8" Vitrified Clay Pipe sanitary sewer with new PVC sewer. The estimate for completing the work received is attached and totals $45,100.00. The exact location of the watermain in relation to the sanitary sewer is not known and therefore the time estimated by the contractor to complete the work is 7 days and takes into account removal and replacement of the watermain. According to the City records the watermain should only be encountered at one crossing location. If this is true the work could be done in less time. To ensure that the Contractor and the City are fair in the regards to payment for the work, we are recommending that the City authorize the work to be completed under a separate contract with Frattalone on a time and material basis. In this manner, the Contractor will be compensated for only the time and materials needed to complete the work. If you have any questions please call me at (763) 434 -5720. 17562 Dunkirk Street — Ham Lake, MN 55304 — (763) 434 -5720 fax (763) 205 -2341 C: \Docurnenls ancf Settings \kathy.glanzer\Local Settings\ Temporary Internet Files \OLK2D \Memo - 050605 -CC (Sanitary Replacement).doc