4.4 PCSR 11-13-2012 - Laserfiche WebLink

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. . There are notes referring to storm sewer to be removed just northeast of the existing home. However, the existing storm sewer is not shown on this plan sheet. C. Sheet 5 of 13 Site and Dimension Plan . The north entrance onto 17yd Avenue should stop the curb at the plat boundary. Extending curb onto 173rd Avenue which is a rural section would create a snowplow hazard. . There is no lighting shown on this plan. D. Sheet 6 of 13 Site and Dimension Plan . The one-inch copper water service shown for the existing home should be removed along with the removal of the home. Elk River Municipal Utilities should be contacted to verify the method of removal. . This plan sheet should be revised to reflect the additional dedication of right of way along 171 st Avenue in the location of the existing home to be removed. E. Sheet 7 of 13 Grading and Drainage Plan . . Show the normal water level on all ponds. . The north pond (12) lOa-year HWL is shown as 879.5 but the drainage calculations show the HWL as 880.82. . Show emergency overflow (EOF) of 880 between north pond (12) and east pond (11). . East pond (11) shows a lOa-year HWL of 879.5 but the drainage calculations show the lOa-year HWL as 880.82. . Show erosion blanket on all pond slopes according to NPD ES guidelines. Erosion blanket must be placed within 7 days of completing work on pond slopes. . The grading of the ponds as shown limits access to the existing sanitary sewer manholes along the east property line. The City Sewer Department needs to access these manholes with a large truck for annual sewer jetting. Revise the grading plan to show truck access to all of the existing manholes. F. Sheet 8 of 13 Grading and Drainage Plan . . Existing catch basin at south end of existing parking lot has 8.67 cfs flowing to it which will exceed its inlet capacity. Install additional catch basins to meet the required inlet capacity as needed. . Silt fence along the south drive is shown off of the project site. . Provide easement for south pond outlet pipe. . South pond shows lOa-year HWL as 875.5 but the drainage calculations show the lOa-year HWL as 879.6. Provide EOF swale from south pond to 171 st Avenue. . Grade the area along the north boulevard of 171 st Avenue to provide 2 percent positive slope towards the curb line. . Is the power pole south of south pond to be removed? . Change storm sewer layout to collect drainage at curb line south of the car wash by sliding CBMH 107 south to the last parking stall. S:\PLANNING\Case Files\Z006\Plat\P 06-06 ]abez\04 03 06 engr memo. doc