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1/ k Bonestroo <br />Rosene <br />Anderlik & <br />^ ^ Associates <br />Engineers & Architects <br />May 28.1999 <br />Bonestroo, Rosene, Anderlik snd Associates, Inc is sn Attirmstive AcdOf^'Ro^ki Opportunity imptoyer <br />Principals: Otto G. Bonestroo. PM. • Joseph C. Anderlik, P.6. • hAar. In L Sorvaie. PJ. • <br />Glenn R. Cook. PE. • Robert G. Schunicht, PE. • Jerry A. Bourdon. PE. • <br />Robert W. Rosene. P6.. Richard 6. Tbrner. PM and Susan M. Eberlin. CJIA.. Senior Consultants <br />Aiiociafe Principals: Howard A. \ar\totd. PX. • Keith A. Gordon. PE. • Robert R. Pfefferle, PE. • <br />Richard W. Poster. PE. • David O. Loskota. P.E. • Robert C Russek. AXA. • Mark A. Hanson. PE. • <br />Michael T. Raut/nann. PE. • Ted K.FIeld. PE. • Kermeth P. Anderson. PX • Mark R. Rolfs. PX • <br />Sidney P. Williamson. PX. LS. • Robert F. Kotsmith • Agnes M. Ring • Allan Rick Schmidt, PX <br />Offices: St. Paul, Rochester. Vlllmar and St Cloud. MN • Milwaukee. Wl <br />Webi/fe: wwwbonestroo.com <br />Mr. Paul Weinberger <br />Assistant Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, MN 65323 <br />JU:i 0 .1 1999 <br />Cl I t w, .u ;o <br />Re;Crystal Bay Preserve <br />File No. 139-2477 <br />Dear Paul: <br />have reviewed tbe preliminary grading and dramage plan for the proposed Crystal Bay Preserve eight- <br />lot subdivision. The site is located east of Old Crystal Bay Road and north of the Luce Line Trail in the in <br />the northeast quarter of Section 23. We have the following comments in regards to engineering matt ers. <br />The proposed NURP pond location and calculations appear acceptable. We recommend the pond have <br />a rip rapped emergency overflow at an elevation of 983. The overflow should be located near the <br />proposed pond outlet <br />The proposed NURP pond will only treat runoff from most of Lot 2 and the roadway. Stormwater <br />from the remaining Lots will flow overland to the existing ditches and wetland. We recoi^end <br />I____________»K, iMoVcirfA nf flit 1 Ai«. The buffer strios should be sized to <br />trom tne remaining lxjis win uuw uvciuiuu w uiv — ----^------ --—— <br />installing a vegetated buffer strip along the backside of all l^ts. The buffer strips should be sized to <br />r rovide water quality for runoff prior to flows readiing the existing ditches and wetland. <br />Our 4/5/99 comments inconectiy recommended reducing the existing wetland outlet from finches to <br />27-inches. The City ’s draft Surface Water Management Plan (SWMP) recoou^ds this outlet be <br />restricted to an IS-indi diameter outlet ratha dian 27-inches. The corresponding 10 and 100-ycar <br />water leveb in the wetland would be 963.4 and 966.3 respectively. The ^DNR has indicated that <br />revised wetland water levels may conflict with tihe Luce Line Trail elevations just sooth of die site. <br />Plans should be submitted to tbe DNR for their review. Some berating may be required between tbe <br />wetland and tbe septic sites <m Lot 6 to protect diese sites. <br />• Erosion conuoi measures should be shown t»u the plans to protcci ull wetlands and drainagcwa>». Thw <br />erosion control should be in place prior to any grading and until vegetation has been established. <br />Please contact me at 651-604-4863 if you have any questions regarding dtis matter. <br />Yours very truly, <br />BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. <br />/oy>f <br />Tom Kellogg <br />Cc: Greg Gappa, City of Orono <br />2335 West Highway 36 ■ St. Paul, MN 55113 • 651-636-4600 ■ Fax: 651-636-1311