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Mr. Scott Harlicker • April 17, 2002 Page Two This issue should be looked at in greater detail. If a street access cannot be provided across the gas lines, consideration should be given to connecting Vance Drive to Tyler Court through the wetland area. This would be consistent with the action taken on a recent plat, Windsor Park Third, where a street was required through the wetlands to eliminate a dead-end cul-de-sac. In that particular plat, the two issues that were slightly different are the streets in Windsor Park Third were public and there was no other means of emergency vehicle access provided. C. PRELIMINARY GRADING, DRAINAGE, AND EROSION CONTROL PLAN • This plan should be provided in a larger scale so that the detail of the grading can be reviewed. • There are several locations on this grading plan where relatively high (8 to 10 feet) retaining walls are proposed. This would include areas behind multi-family units, adjacent to wetland, and along both sides of Vance Street as it crosses the wetland to make the connection with Trott Brook Parkway. All of these retaining wall areas should be terraced so that the retaining walls are relatively short. • Emergency overflows need to be provided for catch basins at low points and all ponds. • Some additional easements need to be provided on the final plat for drainage which cannot be contained within prescribed drainage and utility easements. • • The cul-de-sac with the large island in the center of it on Smith Circle needs to be built to the new City standard for cul-de-sacs containing islands. A standard detail showing the minimum radii for these types of installations can be provided. D. PRELIMINARY UTILITY PLAN • A County permit will be required for the access point onto CSAH 13. We believe that the County has already given preliminary approval to the access point, but an actual permit will need to be issued for the construction. • Sufficient drainage and utility easements will need to be provided for all of the sanitary sewer and watermain serving the multi-family units from private to private roads. The storm sewer servicing the private roads will be considered a private utility and the responsibility of the association to maintain. If you have any questions regarding these comments, please call. Sincerely, Howard R. Green Company �j��%(� Terry J. Maurer, P.E. • TJM:tw Howarc R. Green Company Ltr 4-17-02 Harlicker.rev CONSULTING ENGINEERS