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B • 11 • Bonestroo9Rosene �Anderlik& 1 \J 1 Associates ----- Engineers & Architects August 15. 2000 Mr. Paul Weinberger Zoning Admini trator/Planner City of Orono Post Office Box 66 Crystal Bay, MN 55323-0066 Bonestroo, Rosene. Ander l k and Anoe at�s. I '1c. II an IHI rmath,e A,c on/Equ I Oppottun ty Employer and Employee Owned Prfnclpals: Otto G Bone, oo. PE • rv,n Sor I . PE • Gle Coo· . PE • Robert G Sc un1chr. PE • /err A Bovrd PE Sen,or Consultants: Robe t Ros,ne. PE • Jose h C An err, . PE • 1c. rd E urn,r. PE • Sus"n . EbtrOn. C PA A:uocfate Prine pats: Ho rd A. S ntord. PE • K , h Go don . PE • r? err R. P ef erle. PE • Richard \JI Foster. PE • 0 Id 0. LOS 0 1 [ • PE • RoDert C. Rus ek. A I.A • rk A. H nson. PE • 1cha,1 autm�nn. P.E • ed Fl Id. P£ • e n t p A d�rson. PE. • d . Ro lfs. PE • 0 V d A. Bon nroo. � 8 A • Stdney p 1ll1 . ton. PE. ls • A5n .s ,'w R1 g. . -=· PE Off c�s: St. Paul. St Clo d. Rochesc r nd W1llm r. , •11 u � . WI \JVebsUe: vww bo uroo.com Re: Brenshell Homes 6-Lot Subdivision @ Garden Lane BRA File No. 39•2596 Dear Paul: We have reviewed the preli1ninary pl t for the proposed six-lot subdivision for Brenshell Homes. The site is loca ed east of Garden Lane and west of Wildhurst Trail in the west half of Section 7. We have the fol O\Ving comments in regards to engineering matters. 1.Utilities: The proposed sanitary sewer installation raises some concerns. Sewer is proposed to be installed in an existing steep slope b t,veen Lots 2 and 3 and also do,vn the center of Wildhurst Tra · 1. Disturbance of the st ep slope is a serious erosion concern. Installation of the sewer in Wildhur. t Trail \v· ll requir the removal of the entire driving surface making through traffic difficult if not impossib e. We strong y recommend that the portions of the sewer between Lots 2 and 3 and the segment along Wildhurst Trail be directionally bored to prevent disturbance to the steep lopes and allow for through traffic during construction. Final plans shou d include plan and profi e views of t·h sanitary sewer. Record p ans should b pro ided to the City upon project completion. City tandard d ails should be included in the plan set. 2.Streets: Plans should include a typical street sec ion. A geotechnica analysis. R-value recommendation and pavement design calculations should be submitted for revie\v. It appears tha the street will be an urban section with curb and gutter. All curb and gutter shall be concrete, no bitunlinous c rb i� allo\ved .. The fire chief should review and cornment on the proposed hammer handle tum-around on Garden ane. The chief should also look at the proposed driveway alignment to serve Lot 5. Recent discussions with local firefighters indicate that long c rving driveways can be nn obstacle for fire trucks. The City should review and determin \vheth r Garden ane should be constructed further to he north to provide access the Saga Hill Park... J.Grading and Drainage: The proposed grading plan reduces he existing contributing drainage area to the souther y ravine hy about 2 .5 acres. Storm SC\ er will redirect th· s drainaoe area to the northerly ravine \vhere the adi nt i .. half as steep as th south ravine. This is consistent with our previous comment . The developer• s drainage calculations appear acceptable. Both ponds red ce th off-site flo\v ompared to predevelopment conditions. Both ponds should h ve outlet structur construct d to City standards that provide kimming to the I 00-year storm event. Storm sewer design and cal cu lat ions should b provided for rev1e\v. Final plan should be submitted to th Minn ota D R and the Minnehaha Cre k Wat rshed District for their review and appro al. 4.Easements: Dr in and utility eas m nt hou d b provided 5-feet Vlid a on all interior lot li e-and I o.fi et wid alono roadway ri ht-of-way . Drainage easement hould b p o id d 2335 West Highway 36 • St. Paul, MN 5511 • 651-636-4600 • Fax: 651-636-1311