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• Mr. Scott Harlicker August 17, 1999 Page Two 3. Given the house pad location and the elevations there are a number of potentially flat driveways. These would include Lots 7, 8 of Block 1 and Lots 4, 5, Block 2 and Lot 1 and 6 of Block 3. Conversely Lot 5, Block 1 shows a driveway very close to exceeding the 10% maximum grade. 4. We would recommend that the proposed storm sewer be extended northerly to the intersection of 201st Avenue and Polk Street and a catchbasin be placed at the northwest corner of this intersection to pick up the flow coming from both streets prior to crossing Polk Street. 5. Lot 6, Block 1 and Lot 6, Block 2 have very severe grades immediately outside of the right- of-way. We would suggest that the grading plan indicate how a driveway would be constructed on these two lots. We have in other instances required the developer to actually construct these severe driveways with the mass grading operation to insure that they are built at a reasonable grade. 6. There are a number of lots where the natural elevation at the proposed septic system location is relatively close or even below the elevation of the water in the wetland. The water elevation in wetland number 12 is shown at 934.7. Many of the septic system locations in the southerly lots of Block 2 are at or below these elevations, we would recommend that it be required that any of these questionable lots have a soil boring and percolation test taken on them prior to final approval to insure that a septic system can be constructed on the lot. The detailed listing of these lots in question can be provided to the developer at a later date. 7. Down in the southern part of the development where 201st Avenue meets the plat boundary there is grading shown off of the project site. The 934 contours just end off the project site. More definition needs to be provided as to what grading needs to take place here and how the developer proposes to receive permission from private land owners to accomplish this grading. The same is true at the northern end of the plat where the temporary cul-de-sac of Polk Street meets the plat boundary. There is significant amount of grading off of the project site. The developer should provide proof that they have permission to undertake this grading prior to approval of the grading plan. 8. In Outlot B there is a trail shown that is labeled private trail. This trail crosses the wetland and a couple of locations. It is unclear how they propose to have a trail cross the wetland without putting fill into the wetland area, which would require approval through Steve Rohlf's office. If you have any questions regarding these comments please call. Sincerely, Howard R. Green, jCompany /` �CGC '-Z2 • Terry J. aurer, P.E. 0:\PROD\807640]\0240\640-1705.augu§t99.80rC R, Green Corn oany CONSULTING ENGINEERS