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•' Consulting Engineers & Surveyors <br />2638 Shadow Lane, Suite 200 „ Chaska, MN 55318-1972 <br />Phone 952 448-8838 • �I:axc152 448-8805 <br />— wwmbolton-menk com <br />Apri l 1 1, 2016 <br />City of Orono <br />Attn: Mike Gaff -on <br />2750 Kelley Parkway <br />Orono, MN 55356 <br />RE: Preliminary Plat Application 16-3822 <br />Eisinger Meadow~ <br />Engineering Review #1 <br />Dear Mike: <br />As requested, we have complctccl an engineering review o1 the documents submitted for the abcwc <br />referenced project. We offer the following observations, commcivs, and reconuriendations for sour <br />consideration: <br />1.0 GENERAL: <br />I . I Stormwater rnanarcrnent for the 1 -proposed site meets City requirement,. Proposed peak runohf' <br />rates will be restricted to less than existing peak runoff rues. However, if the proposed Liesii�1.11 i�, <br />significantly reVnsed during the Final Plat approval process, a Final Stcrmwatcr Manat ement Plan <br />should he submitted with the Final Construction Plans. Also, additional detail will be required <br />with the Final Plans to ensure .system is constructed as clesiigned. <br />1.2 Storm sewer calculations Should be submitted for rcvicvA/ to verity adcga.ate Sizing. <br />1.3 The Conservation Design MasterPlan (CDMP) should be :revised to include more coirnplele <br />recommendations and direction to address the following topics: <br />a. Invasive Species — The CDMP should be revised to include .a complete Vegetation <br />Management Plan. The plan should include it list of all invasive plant species encountered (ii.e. <br />buckthorn. ;'jarlic mustard, reed canary grass, creeping charlie, canada thistle, etc. i and <br />recommended procedures and schedule for eradication of listed species. <br />b. Protection c11' Significant Tree Stands — The CDMP should be revised to include discussions on <br />the location, quality, and value of existing significant tree stands, ri;commend tions fox au,ea:; <br />to be preserved, and justification and mitigation of impacts of any such stands to be impacted <br />by development activities. The Vegetation Management Plan should depict proposed Tree <br />Preservation areas and trees designated for removal to allow for review of potential <br />conservation casements. <br />c. Protection off_Wetlan�ls= The Vegetation Manac.cincnt Plan should include procedures. <br />schedule, and seed mixes for protecting and establishing buffers aroi.md wetlands. <br />1.4 Due to the size of proposed disturbance, a Topsoil _Malla�'emein[ Plan should be included With thc <br />Final Plans to ensure adequate topsoil placement. "f he plan should proliide direction for topsoil <br />stripping, stockpile location(s), soil de -compaction prior to re -spread, certification of topsoil for re - <br />spread meeting spccil'ications, and placement of'topsoil. This information could be included ,.n1 <br />the Final Grading Plan. <br />1.5 The applicant will be required to obtain Minnehaha Creek 'Naterslied District (MCWD) ,approval~ <br />and permitting for their Erosion Control. Wetland Protection, and Watcrbody Crossings <uu.l <br />Structures Rules. A copy of any approvals or permits rr_quiirecl Should he submitted prior to Final <br />