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<br />. <br /> <br /> <br />Howard R. Green Company <br />CONSULTING ENGINEERS <br /> <br />September 15, 1999 <br />File: 807640-0240 <br /> <br />Mr. Scott Harlicker <br />City of Elk River <br />13065 Orono Parkway <br />Elk River, MN 55330 <br /> <br />RE: PRESERVE ESTATES ADDITION <br /> <br />Dear Mr. Harlicker: <br /> <br />We have reviewed the revised information provided by the developers of Preserve Estates. <br />Based on our review we would offer the following comments: <br /> <br />A. Grading Plan <br /> <br />. . The concept for storm drainage on the grading plan has changed at the west end of 201 st <br />Avenue there are two catch basins located close to Tyler Street. A stub is extended out of <br />each catch basin to collect water from a natural low area. We question why the low area on <br />the north side of the road is not just eliminated with the grading of the site. This would <br />eliminate the need for the storm sewer stub on this side. <br /> <br />The stub on the south side goes to Lot 2, Block 2, which is the lot that contains the existing <br />house. The drain field for this existing house falls under the proposed road, therefore must <br />be reconstructed. This house is also impacted by the 188-foot setback from the ordinary <br />high water level. We understand from the developer's engineer that the DNR has now <br />established the ordinary high water level at 937.1 which will move the set back line <br />approximately 1 O-feet further from the wetland. We have two concerns with this lot relative <br />to the location shown for the primary and secondary drain fields. First of all the drain field <br />site falls within this low area being drained by the storm sewer. Obviously a septic system <br />can not be constructed in a low area which collects natural run-off. The second concern is <br />that the moving of the 188-foot setback squeezes this lot even further. We question <br />whether this lot has sufficient room on it to construct a new primary septic system and <br />account for a secondary septic system location. <br /> <br />. <br /> <br />. In Lot 8, Block 1 there is an easement connecting wetland number 6 and wetland number 7. <br />It appears that the actual low point between these two wetlands is not included but is just to <br />the west of the easement. If this is the case, the developer should show how he proposes <br />to grade this area so that overflow from wetland 6 will flow to wetland 7 within the provided <br />easement. The other option; of course, is to move and or expand the easement to <br />encompass the natural drainage in this area. <br /> <br />\\SPNWFS\vOL 1 \DA TA\PROJ\807640j\0240\640-1501.sept99.doc <br /> <br />1326 Energy Park Drive. St. Paul, MN 55108 . 651/644-4389 fax 651/644-9446 toll free 888/368-4389 <br />