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Stantec Consulting Services Inc. 2335 Highway 36 West St. Paul MN 55113 Tel: (651) 636-4600 Fax: (651) 636-1311 sm v:\1938\active\193803433\design\ericson_mrs^21st ave. plan comments 8.30.16.docx August 31, 2016 File: 193803433 Attention: Mike Ericson Administrator City of Centerville 1880 Main Street Centerville, MN 55038 Dear Mike, Reference: 21st Avenue, South of Commerce Drive We have reviewed the plans for the proposed improvements to 21st Avenue, south of Commerce drive and offer the following comments. After your review, please pass them on to the City of Lino Lakes, so they may have the developer incorporate the necessary changes. Storm Sewer We concur with the requirements of the City of Lino Lakes’ Engineering staff to design the storm sewer (pipes and inlets) to a 10-year storm event. We would add that any low points should be designed for the 100-year event. The standard detail plate for Rip Rap at RCP Outlets (STR-7) says that: “Requirements for rip rap size, thickness will be designated in plans.” We do not see a note detailing this. Also, the detail notes the length of the rip rap area past the end of the apron “as directed by the engineer.” Again, this should be called out on a plan sheet. Finally, it is not clear how details STR-7 and STR-9 work together. For instance, the rip rap detail has fabric tucked under the apron, but this will be complicated by the sheet piling. SWPPP The owner should be listed as United Properties as we understand the project. The description of the project area should be amended to include grading, BMP installation and other activities which takes place in Centerville, as shown on the plans. We are concerned that the project SWPPP does not contemplate the placement of material on the Rhebein property, west of 21st Avenue. We would like to see the project SWPPP revised to include the fill site. Despite this site being a separate parcel, it is clearly a connected activity and part of the project. Road Design An entrance, with curb cut and concrete apron, for the Rhebein black dirt business should be provided, south of the creek crossing. Once this entrance is in place, all traffic into and out of the area should utilize it. It may be appropriate for this entrance to be opposite the northernmost driveway entrance to the distribution center site. A striping and signage plan should be developed for the project. We will review this once submitted. The vertical curves at 1+25, 4+50 and 6+50 have low algebraic differences and represent either high or low points. This makes for very flat grades near the high and low points, respectively. We suggest either making shorter vertical curves (some algebraic differences