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Ms. McPherson June 22, 2000 • Page 2 center of the site. This location appears to meet that requirement with that retaining wall located approximately ten feet from the neighboring property and no grading needed between the retaining wall and the property line. This is not true of the proposed retaining wall behind building 40/41 and 42/43. Here there are missing contours between the retaining wall and the property to the south. The original grading plan dated May 15, 2000, showed approximately six to eight feet of fall from the neighboring property line to the retaining wall. There were contours throughout the area between the retaining wall and the property line. Clearly, this area would not meet the requirement of no grading under the drip line if in fact this area of the neighboring property is treed. This is difficult to determine because nowhere on the Pioneer submittal is existing vegetation showing. 5. Crossing under Twin Lakes Road (CSAH 13) near Building 71 there is an existing 66" RCP culvert. The storm sewer plan shows building a manhole over this structure and extending storm sewer each direction. It is unclear how this will be accomplished since a manhole structure around a 66" pipe would need to be huge. Another issue in this location is the fact that the storm sewer shown will be a private utility but it is shown constructed partially in the Twin Lakes Road right-or-way. We question whether or not there is even sufficient room for this construction with the other utilities which may be located here. We also question • whether a private utility should be built in a public right-of-way. 6. Elsewhere throughout the site, the private storm sewer is constructed through the driveways of the various homes. We would suggest that it would be a better design to add an additional manhole structure where necessary and keep the storm sewer construction in the street locations, rather than having it shortcut through the driveways. 7. On Thursday, we just received revised storm drainage calculations which we have not yet reviewed. We will advise you of our findings after the review is complete. B. Preliminary site and utility plan 1. The road layout in the development provides for cul-de-sacs coming from various directions. City staff asked for these roads to be constructed as cul-de-sacs to eliminate any potential cut-through traffic from CSAH 13 to Barrington Place in an attempt to shortcut the collector roads in the area. The site plan does show a 20'-wide fire lane access detail for construction linking the two cul-de-sacs in the northern part of the development. This should adequately address emergency vehicle concerns. 2. The water main is looped throughout the site connecting at two locations to the existing water main on CSAH 13 and in a third location to the existing water main in 6th Street. There appeared to be adequate hydrants and valves shown on the • Ltr-062200-McPherson.doc Howarc R. Green Company CONSULTING ENGINEERS