6.6. SR 02-20-2001 - Laserfiche WebLink

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Ms. Michele McPherson January 9, 2001 Page Two submitted, reviewed, and approved. Storm sewer calculations should provide for emergency overflows of each pond and also provide detailed calculations relative to the private ditch which enters the site from the northeast and exits under County Road 13. There is storm sewer shown behind Lots 1/2 and 3/4 which seems excessive. It appears that this area could be gradually graded so that storm water would flow to a point further west where it could be picked up, minimizing the amount of storm sewer pipe. There is a storm sewer stub between Buildings 35~36 and 37~38 which collects water in the rear yards. It appears that this storm sewer could be eliminated by grading this area to drain to the east out to the street. The two cul-de-sacs on the plan will require either cross-gutters or storm sewer catch basins on either side of the cul-de-sac to collect the water flowing down the street. There is a retaining wall immediately across the street from Buildings 17/18. This wall could be minimized in height by tightening up the proposed contours behind the wall. Also, we would suggest the wall be moved further away from the street to provide more room for snow storage. The next submittal should have the existing contours labeled. Currently, there are no elevations shown on the existing contours which makes it difficult to review the grading plan. The wetland filling and mitigation area will need to be reviewed by Steve Rohlf and the Technical Evaluation Panel if he determines it is necessary. The major pond in the eastern part of the development has 3:1 contours leading down from the street. An attempt should be made to get a larger, relatively flat area behind the curb and gutter prior to the in-slope into the pond. Currently, the 3:1 slope appears to start almost at the back of curb leading down into the pond, Otherwise, some other method of protecting the street traffic from the pond in-slope will be necessary. If you have any questions regarding these comments, please call. Sincerely, Howard R. Green Company TJM:tw O:~PROJ\809759J\O240,Ltr 01-09-01 McP~_~nv~//~.r.d R, Green Company QQNSULTING ENGINEERS