01/10/2005 Council Packet - Laserfiche WebLink

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Engineering Review (box Den Acres City of Lino Lakes, Minnesota • • Page 3 December 8, 2004 2004). At the time of this writing, RCWD has determined the application to be Incomplete, pending the receipt of several additional items. All requirements of the RCWD must be met. 4. The Grading Plans shall also specify that all house pads on filled areas shall be designed by a registered Professional Engineer (per geotechnical recommendations) and approved by the City of Lino Lakes. 5. A Certified As -built Survey shall be provided by the Developer's Engineer upon completion of grading, certifying that all grading complies with the Grading Plan. This Certification shall be required prior to the issuance of any building permits. Final certification that the grading meets City requirements for adequate drainage and minimum slopes will be required prior to the issuing of building permits. Percent grades shall be shown on the Plan. 6. Revised drainage calculations and drainage area maps have been received and reviewed. 7. At the following locations on Red Fox Road at approximately Plan Station 4 +00 and Plan Station 13 +00, and on Fox Road at approximately Plan Station 14 +25, the Street Grading Plan shows tipping the street slope in one direction across the street width. This will create some safety and maintenance issues. It is recommended that the street crown typical section be continued through these storm inlet/outlet locations. Most likely this will include the adding of inlet structures and storm piping systems to eliminate potential sheeting and confluence of stormwater runoff at these locations. 8. The plans have been reviewed for conformance with the City of Lino Lakes Storm Water Management Policy. Rice Creek Watershed District (RCWD) recommendations per permit application No. 04 -039 have also been reviewed. Following are some addition general comments regarding grading and drainage: In general, the drainage plan for the proposed development employs five storm water infiltration basins with sediment trap fore bays that are designed to treat the storm water emanating from proposed roadways and adjacent front yards of the proposed housing sites. Comments are as follows: 1) Except for Basin 1 all of these basins drain to the south and southwest into a large wetland complex. Basin 1 drains to the north but the ultimate flow path is unclear. 2) RCWD noted that Lots 1, 2 and 9 Block 5 should "be at or above the adjacent ponding area 100-year-year elevations." It would appear that RCWD is referring to the 100 year elevations in Infiltration Basins 4 and 5. The applicant's. engineer (Plowe Engineering) has indicated that any overflow from these Basins would flow into adjacent wetlands before water backed into the homes on these lots. That may be accurate if the proposed grading plan is not altered for these lots and final grading is performed properly. However, the City's standard requirement of the low floor being 2 feet above the 100 year elevation and 1 foot above the emergency overflow elevation not is not being met at these locations. It is also not known if the low floor elevations meet the minimum City requirements for separation from high ground water levels. Therefore, it is recommended that the house elevations at these locations be adjusted (raised) as required. -42-