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<br />2 of 4 <br /> <br /> <br />10062 Flanders Court NE – Blaine, MN 55449 – Ph: (763) 780-0450 Fax (763) 780-0452 <br /> <br /> <br /> <br />Grading Plan <br />1. The high water level (HWL) of the ponds is shown as 943.6. This does not <br />provide 1 foot of freeboard from the street inlet elevation of 943.52, therefore <br />the street should be raised or the pond HWL lowered. <br />2. The Emergency Overflow (EOF) for the ponds should be shown on the plan. <br />The EOF elevation should be 1 foot above the HWL and the applicant should <br />ensure the location of the EOF will direct water onto Rice Street and not into <br />the private property to the north. <br />3. As shown the retaining walls in the northeast corner of the property are within <br />the drainage and utility easement. The City does not take responsibility for <br />any impacts or maintenance of these walls in the future. Ongoing <br />maintenance should be covered by the association documents or covenants. <br />It appears that water will be running over these walls and measures should <br />be taken to prevent erosion at the base of the walls. <br />4. The applicant should be required to install the watermain running parallel with <br />the retaining wall inside a steel casing pipe. This will prevent wall damage if <br />there is an issue with the watermain in this section of main in the future. <br />5. A spot elevation should be provided at the high point location of the drainage <br />divide on the south side of the southeast units. <br />Utility Plan <br />1. Standard hydrant coverage is provided by the existing hydrant south of the <br />property along Rice Street and the new hydrant being added on the east end <br />of the private street. We have asked the Fire Chief to review the location of <br />the hydrant on Rice Street to make a determination on its use and if a hydrant <br />should be added at the new intersection. <br />2. The sanitary manhole added to the existing line must have an integral base <br />and the sanitary line south of the new manhole should be abandoned. <br />3. A structure should be added to the existing storm sewer line and the retaining <br />wall drain tile lines discharged into the new structure. <br />4. The air release manhole should be eliminated from the plan and the hydrant <br />moved to the high point in the watermain. <br />5. A note should be added that the 90 degree turn in the watermain must be <br />accomplished with two 45 degree bends. <br />6. The watermain and fittings should be wrapped. <br />7. The watermain and sanitary sewer are running parallel at what appears to be <br />nearly the same elevation. It may be beneficial to adjust the elevation of one <br />of these facilities to avoid service conflicts <br />8. Services are not shown, but each unit should have an individual water and <br />sanitary sewer service.