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Bones troo Rosene Anderlik & Associates Engineers & Architects Boneitroo. Boiene, ArCt'^K AsiOCiJtei, tnc n sn Afftrm^nv^ Action, Sou^i Opportunity Empto PnnctpsH Otto G Bonestroo RE • Joseph C. Andcrhii. PE • Marvm t Sor/«iM. PE. • Glenn R. Cook. PE • Rooert G. Schumcht. RE. • Jerry A. Bourdon. PE. • Robert W Rosene. PE. Richard £. Turner. PE. and Susan M Eberlm. C PA. Senior Consultants Associate Principals Howard A. Sanford. PE. • Keith A. Gordon. PE. • Robert R. Pfefferle. PE • Richard W. Foster. PE • Oa/id O Loskota. PE. • Robert C. Russek. A IA • .Mark A. Hanson. PE. • Michael T Rautrrann. PE. • Ted K.Field. PE. • Kenneth P Anderson. PE • Mark R. Rolfs. PE. • Sidney R Williamson. PE. LS • Robert F. Kotsmith • Agnes M Ring • Allan Rick Schmidt. PE. Offices: St. Paul. Rochester. Wilimar and St. Cloud. MN • Milwaukee. Wl Weosite wwwbonestroo com .a# E November 9,1999 Mr Paul Weinberger Zoning Administralor/PIanncr City of Or.;no 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 Eeckout 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 ihc following commcnls in regards to engineering matters. 1. Access/Streets: The proposed access to the site is across a parcel marked casement area. The parcel is 40-fcct 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 casement. 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 serv ing 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 407o on Lots 2,3 and 7. Driveway design on these Lots will be critical as we recommend that driveway grades not exceed 10%. Access to Lot 7 across Outlet 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 con&ol measures should be in place prior to any grading, particularly along the weUand. 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 Tanager Lake drainage district. A general location for a NURP pond has been identified on the plans. The final plans should include final pond grading including a 10:1 aquatic bench lO-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 floatables 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. SaniUry Sewer: The City ordered and received a feasibility report for sanitary sewer to serve the Fox Ridge neighborhood located just south of the Van Eeckout property. The report identified a pressure sewer system v 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 of Fox Ridge and south of Watertown Road needing sanitary sewer. The Van Eeckout plans include a preliminary design for sanitary sewer to serve 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 Ridp 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