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red- .A1d Howarc R. Green Company May 21, 2003 File: 812970J01-0240 Mr. Scott Harlicker Senior Planner City of Elk River 13065 Orono Parkway Elk River, MN 55330 RE: WEST OAKS ADDITION Dear Mr. Harlicker: As requested, we have reviewed the revised submittal for the West Oaks Addition. As you are aware, this is the subdivision west of Waco Street, north of Pine Wood Golf Course and abutting Big Lake Township. The proposal is for 15 single-family residential lots abutting the Pine Wood neighborhood and 122 multi-family units over the remainder of the property. The property is just over 38 acres in size. Based on our review, comments received at the staff review meeting and a meeting with the developer, we would offer the following comments: • A. Grading, Wetland Mitigation, and Erosion Control Plan • This project had previously received approval from the Technical Evaluation Panel (TEP) regarding wetland filling for road purposes. Because the site plan has been revised slightly, the project was revisited by the TEP. The revised plan fills slightly less wetland area than the previously approved plan by the TEP. Therefore, the TEP approved the revised plan. • This project will need an NPDES permit from the City of Elk River prior to any construction activities on the grading of the site. The site may need slightly more silt fence around the wetlands and near Waco Street. Also, the site should be required to install silt fence after the detention pond construction is complete. This will protect the newly constructed detention ponds from erosion due to house construction while turf is being established on the pond slopes. • There are some driveways on 184th Circle near Xerxes that exceed the City's ordinance of 10 percent slope. The two buildings closest to Xerxes Street should be reviewed and lowered to reduce the driveway slope. • We have reviewed the drainage calculations submitted for the revised development plan. Generally, the concept of the drainage is acceptable; however, there are still some minor changes and/or revisions that need to be made to the drainage calculations before they are approvable. They would include the following: ➢ The ponding area and storage volume used for Structure#5 seems to vary a minor amount, actually increasing in the Post-Developed conditions. Given the roadway • crossings as fill placement, how is the increase in storage area obtained? Ltr-051903-Harlicker 1326 Energy Park Drive • St. Paul, MN 55108 • 651/644-4389 fax 651/644-9446 toll free 888/368-4389