12-13-1999 Council Packet - Laserfiche WebLink

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1/1 Bonestroo Rosene mnB Anderlik & I Associates Engineers & Architects Bonestroo. Bosene. Arct.' •< .mj Assoc ^tes. inc is Affirm^itive Ac:>on Bautif Opportunity Bn'pio, >r Princpills Otto G 9or'es!'co PE • Joteph C Anderitk. PE • V*»rvin L SorP£. • Glenn f?. Cook. P£ • Izze'i G Schunicnt. PE • Jerry A Bourdon. PE • Rooeri W Posene. Pc . f?i:n^rd E Turner. PE jnd Susan M EOcrhn. C PA . Senior Consultants Associate Principals Hc.vard A Sanford. PE • Keith A Gordon PE • PoOerr R Pfefferle. PE • Richard W Foster. ?E • Oa/id O Loskota. PE • Robert C Russek. A l A • Vark A Harion. PE • Michael T Raut-T^ann. PE • Ted K Fie ’d. PE • Kenneth P Anderson. PE • Mark R. Rolfs. PE. • Si Jney P Wii' amson. ?£ . L S • RoOert F Koismii.h • Agnes M Ring • Allan Rick Schmidt. PE Offices St Paul. Rochester. Wiiimar and St Ooud. MN • Milwaukee. Wi U'fpsite Aw.vorrestrco com November 9, 1999 Mr. Paul Weinberger Zoning Administrator/Planner Ciiy of Orono Post Office Box 66 Crystal Bay. MN 55323 Re:Van Eeckout Subdivision File No. 139-2550 Dear Paul: We have reviewed the preliminary plat for the proposed seven lot Van Ecckout subdivision. The site is located east of South Brown Road, south of Long Lake and north of the Luce Line trail in the northeast quarter of Section 3. We have the following comments in regards to engineering matters. 1.Access/Slreets: The proposed access to the site is across a parcel marked easement area. The parcel is 40-feet wide. The ownership of this easement area is unclear. We recommend that the access to the property be platted as part of the subdivision and not across an easement. The access should be a minimum of 50-feet in width to meet City standards for a public or private street. The proposed typical street sections do meet the City standards for a private street serving seven or more units. The typical street section for station 0+00 to 4+00 shows an urban curb and gutter section while station 4+00 to the end shows a rural section with ditches. A method of conveying storm water from the urban to rural section should be shown on the plans. This may require flumes, swales, ditching or storm sewer construction. The driveway serving the existing house will need to be relocated so that it doesn’t encroach onto Lot 6. Proposed driveway locations to all Lots should be shown on the plans. It appears that existing grades exceed 40% on Lots 2,3 and 7. Driveway design on these Lots will be critical as we recommend that driveway grades not e.xceed 10%. Access to Let 7 across Outlot B will require the construction of a bridge or culverts at the stream crossing. The plans should provide a design for this crossing. 2. Grading: A grading and erosion control plan for the entire site should be submitted for review. Erosion control measures should be in place prior to any grading, particularly along the wetland. Additional erosion control will be needed during construction of the houses. 3. Drainage: The draft version of the City’s* Comprehensive Storm Water Management Plan (SWMP) shows that the site lies within the Tanagcr Lake drainage disuict. A general location for a NURP pond has been identified on the plan^. The final plans should include final pond grading including a 10:1 aquatic bench 10-feet wide at the pond normal water level (NWL). The pond design should also include an outlet structure that provides 1-foot of skimming to remove floatablcs and debris. Best Management Practices (BMP’s) should be implemented on all areas where storm water cannot be routed directly to the pond. A drainage area map, storm sewer and ponding calculations should be provided with the final plan set. 4. Sanitary Sewer: The City ordered and received a feasibility report for sanitary sewer to serve the Fo.x Ridge neighborhood located just south of the Van Ecckout property. The report identified a pressure sewer system as the most feasible to serve the neighborhood. The pressure sewer would be routed up South Brown Road to an existing gravity sewer on Watertown Road. This system would have the potential to serve properties north ot Fox Ridge and south of Watertown Road needing sanitary sewer. The Van Ecckout plans include a preliminary design for sanitary sewer to sene the site. The plans show a gravity sewer system that ties into an existing sanitary manhole at the south end of Apple Glen in Long Lake. This proposed system could potentially serve the Fox Ridge neighborhood if permission were obtained to cross the Luce Line and the parcel directly south of the Luce Line. The proposed alignment as shown would not provide sewer service to properties along South Brown Road. The topography would allow the gravity sewer to be extended westerly in the proposed roadway to South Brown Road to provide future sanitary service. The City of Long Lake should be consulted regarding proposed connections to their sanitary sewer 2335 West Highway 36 ■ St. Paul, MN 55113 ■ 651-636-4600 ■ Fax: 651-636-1311 e •r E