01/10/2005 Council Packet - Laserfiche WebLink

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Engineering Review .ox Den Acres City of Lino Lakes, Minnesota Page 4 December 8, 2004 3) In general, this proposed development will generate a slight increased in runoff rates. This appears to be primarily a result of the RCWD exempting the backyards from stormwater management standards. With the exception of the outflow from basin 1, it would appear that any increases in runoff rates would be inconsequential due to the mitigating affect of the vast area of wetlands receiving the runoff. As stated above, the ultimate flow path for Basin 1 is not known, so it is difficult to make a judgment about increases in runoff from it. In summary, the storm water management features proposed for this development area may be considered adequate once the following items addressed: 1) Assurance that the grading of lots 1, 2 and 9 will be maintained as planned or, failing that, raising the proposed floor elevations to conform with City standards using the 100 -year elevation of basin 4 for lots 1 and 2 and basin 5 for lot 9. 2) The ultimate stormwater outflow destination from basin 1.needs to be determined and evaluated. •treets and Trails 1. Access to this property is proposed from only one location, from Fox Road just east of its intersection with Deerwood Lane. This essentially results in a very large "cul -de -sac" or single point access for the entire Development. The extension of Fox Road through the property considers further extension to the north in the future. However, it is unknown at this time when and if such a second access into the site would happen. Traffic levels of service, safety, and impacts to existing streets and intersections shall be addressed to the City's satisfaction. Comments regarding the Traffic Study are provided further in this report. 2. The City's Comprehensive Plan provides for a regional trail linkage between Reshanau Lake Estates and Birch Park in this area. It is recommended that provisions for the trail link be investigated further as part of this Development. 3. The street layout as proposed on the Preliminary Plat appears to attempt to limit impacts to existing wetlands. However, some filling of wetlands is proposed, and mitigation will be required. As previously mentioned, the Plans shall be subject to the review and approval of he Rice Creek Watershed District in accordance with the Wetland Conservation Act. 4. Prior to any grading or construction, the street and trail plans shall be further detailed for construction purposes as required by the City of Lino Lakes. This would include typical street sections, pavement sections required, street widths, radii, type of curb, etc. As mentioned in comments under Utilities, a Detail Sheet that includes all applicable City standard plates and additional requirements of the City must be provided. 5. The cul -de -sac at the north end of the subdivision on Fox Road is not the full size per City engineering standard requirements(92' diameter). However, it is recognized that this cul -de -sac may be considered temporary, pending extension of Fox Road to the north at a later date. The cul -de -sac as proposed may therefore be considered acceptable. - 4 3 -