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Ms. Michele McPherson <br /> January 9, 2001 <br /> Page Two <br /> submitted, reviewed, and approved. Storm sewer calculations should provide for <br /> emergency overflows of each pond and also provide detailed calculations relative to the <br /> private ditch which enters the site from the northeast and exits under County Road 13. <br /> 2. There is storm sewer shown behind Lots 1/2 and 3/4 which seems excessive. It appears <br /> that this area could be gradually graded so that storm water would flow to a point further <br /> west where it could be picked up, minimizing the amount of storm sewer pipe. <br /> 3. There is a storm sewer stub between Buildings 35/36 and 37/38 which collects water in the <br /> rear yards. It appears that this storm sewer could be eliminated by grading this area to <br /> drain to the east out to the street. <br /> 4. The two cul-de-sacs on the plan will require either cross-gutters or storm sewer catch <br /> basins on either side of the cul-de-sac to collect the water flowing down the street. <br /> 5. There is a retaining wall immediately across the street from Buildings 17/18. This wall <br /> could be minimized in height by tightening up the proposed contours behind the wall. Also, <br /> we would suggest the wall be moved further away from the street to provide more room for <br /> snow storage. <br /> 6. The next submittal should have the existing contours labeled. Currently, there are no <br /> elevations shown on the existing contours which makes it difficult to review the grading <br /> plan. <br /> 7. The wetland filling and mitigation area will need to be reviewed by Steve Rohlf and the <br /> Technical Evaluation Panel if he determines it is necessary. <br /> 8. The major pond in the eastern part of the development has 3:1 contours leading down from <br /> the street. An attempt should be made to get a larger, relatively flat area behind the curb <br /> and gutter prior to the in-slope into the pond. Currently, the 3:1 slope appears to start <br /> almost at the back of curb leading down into the pond. Otherwise, some other method of <br /> protecting the street traffic from the pond in-slope will be necessary. <br /> If you have any questions regarding these comments, please call. <br /> Sincerely, <br /> Howard R. Green Company <br /> f)/failAG(2 <br /> Terry J. aurer, P.E. <br /> TJM:tw <br /> • <br /> O:\PROJ\809759J\0240\Ltr 01-09-01 McPherson.doc <br /> -owarc R. Green Co nn oany <br /> CONSULTING ENGINEERS <br />