2015-01353 - land alteration - Laserfiche WebLink

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PC Exhibit F • = BOLTON � M �N K , INC� • Consulting Engineers & Surveyors '� 2638 Shadow Lane, Suite 200•Chaska, MN 55318-1172 Phone(952)448-8838•Fax(952)448-8805 www.bolton-menk.com June 3, 2015 � RONO COPY City of Orono O Attn: Melanie Curtis 2750 Kelley Parkway Orono,MN 55356 RE: CUP Application 15-3725 4167 Highwood Road Engineering Review#1 Dear Melanie: As requested, we have completed an engineering review of the documents submitted for the above referenced project. We offer the following observations,comments, and recommendations for your consideration: 1. The Applicant is proposing to perform site grading of approximately 415 cubic yards and install riprap along the shoreline. If material is to be imported to the site,the City should consider the following: a. The City Engineer should be allowed to inspect any riprap or fill being imported to the site prior to it being placed. b. The Applicant should confirm with the City Engineer acceptable hours of truck hauling and provide documentation on the haul route to be used. Acceptable hours and haul route should be approved prior to the importing of any riprap or fill. c. The City Engineer should inspect roadways on haul route prior to and following completion of work to determine whether adverse impacts have occurred.The applicant should be responsible for the repair to roadways for any adverse impacts. 2. It is uncleaz what information is portrayed on the Green-Dale Design Plan. A legend should be included that defines existing and proposed features indicated on the plan. 3. It appears that work is proposed below the 100 year flood elevation. Any fill below this elevation must be mitigated for prior to any fill being placed in the floodplain. Plans should be revised to indicate location and amount of floodplain fill proposed and location and amount of floodplain mitigation provided. 4. The information submitted indicates riprap is to be installed to stabilize the shoreline. However,the plans are unclear where riprap is to be placed. The plans should be revised to clearly indicate location of riprap. The size of rock to be used for shoreline stabilization should be specified on the plan. Minimum Class V riprap(6"to 30")is recommended. 5. The plans are unclear what is proposed for retaining walls. The Green-Dale Design Plan should be revised to provide more detail for all proposed retaining wall work. Top of wall and bottom of wall elevations should be provided in key locations (i.e. grade changes and alignment changes). Spot elevations provided should clearly indicate location of proposed elevation. Walls four feet or greater in height must be designed by a Professional Engineer, and plans and calculations specific to the proposed walls must be submitted for review and approval. Multi-level walls spaced less than double the height of the bottom wall apart shall be considered one wall, and the height shall be determined from the base of the bottom wall to the top of the upper wall. 6. The plans should be revised to include cross-section details of the proposed work to indicate how walls will be integrated with�riprap at the toe of slope, location of draintile and tie-backs,fill material