05/29/2001 Council Packet - Laserfiche WebLink

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• • • Shoreland: George Watch Lake is the nearest water body protected by a shoreland overlay district. The ordinary high water level has not been determined for this lake, so the 1000 -ft. shoreland district cannot be accurately determined. Lacking a determination of the OHWL, an estimate was made based on discussion with the MN Dept. of Natural Resources. By viewing aerial photographs and estimating the location of the edge of the cattails around George Watch Lake., the City determined that the shoreland overlay does not extend onto the project site. Floodplain: The project does have a small area near a culvert on the south property line within the 100 -year flood plain of George Watch Lake. The regional flood plain for the site is 886.9 MSL (1998 calibration study by the Rice Creek Watershed District). There is a small amount of floodplain fill below this elevation (George Watch Lake flood plain) in the southeast corner of the site. Quantification of floodplain fill and compensatory storage measures below elevation 886.9 is required The current grading plan necessitates filling approximately 90 cubic yards within the existing floodplain. Compensation in the form of dredging and cleaning of the MnDOT drainage ditch is recommended by the project proposer. Final review and approval of the grading plan by the Rice Creek Watershed District is required. 15. Water surface use. Will the project change the number or type of watercraft on any water body? Yes x No If yes, indicate the current and projected watercraft usage and discuss any potential overcrowding or conflicts with other uses. 16. Erosion and Sedimentation: Give the acreage to be graded or excavated and the cubic yards of soil to be moved: approx 41 acres approx 130,000 cubic yards Describe any steep slopes or highly erodible soils and identify them on the site map. Describe the erosion and sedimentation measures to be used during and after construction of the project. There are no steep slopes on this site. Because the project will involve disturbance of more than five acres of land, application for coverage under the NPDES General Permit for Construction Activities will be submitted to the Minnesota Pollution Control Agency and prior to initiating earthwork on the site. The permit requires that best management practices (BMPs) be used to control erosion and that all erosion controls be inspected after each rainfall exceeding 0.1 inch of precipitation. Erosion control practices to be used on the site will include: 1. Construction of temporary sediment basins in the locations proposed for stormwater ponds, and development of these basins for permanent use following construction. 2. Silt fence installed at the construction limits prior to the initiation of earth work and maintained until all exposed soil is stabilized. 3. Installation of a rock construction entrance. 4. Periodic cleaning of adjacent city, county, and state roadways. 5. Energy dissipation, such as rip -rap, installed at storm sewer outfalls. 6. Use of cover crops, sod, and landscaping to stabilize exposed surface soils after final grading. All erosion control plans will be reviewed by the City of Lino Lakes. Because the above BMPs will be implemented, the potential for adverse affects from construction - related sediment and erosion on water quality will be minimized to the extent practical. Page 18 of 28 Draft EAW Lino Lakes Marketplace May 11, 2001