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Ms. Katie Larsen June 2, 2016 Page 6 \\mspfsv02.lps.local\Studios\Active Projects\CLL16007 - Clearwater Creek Business Park in Lino Lakes MN\From Others (Original Data)\20160602 Engineering Review Lino Lakes United Properties.docx 4. Duplicate SAN MH3 numbering at 16+30 and 20+30. STORM SEWER SYSTEM 1. Provide storm sewer calculations and drainage area maps with your construction plan submittal to verify the size of pipes and spacing of catch basins. 2. The storm pipe diameters, pipe lengths, and pipe grades need to be shown in plan and profile views. 3. The storm sewer is shallow throughout the project site. See City Standard Detail Plate STR-2 and STR-10 regarding shallow pipe installation. 4. The arch pipe crossing the proposed roadway should be identified as 122-inch Span Arch Pipe (this is the appropriate 96-inch diameter equivalent). 122-inch span arch apron on either side will need to have sheet piled end section and trash guard. 5. Minimum structure depth is 3.5 feet within roadway to avoid frost heaving. Grout below invert to provide sufficient depth. Following structures to be updated: 305, 203, 307, and 309x. TRANSPORTATION 1. A Traffic Review was prepared by Spack Consulting, dated May 16, 2016. The following comment/questions should be addressed. • The original AUAR analyzed three land use scenarios. For the proposed United Property site all three scenarios assumed the same land use. Based on the maps (Figures 6-2,6-3 and 6-4) in the AUAR the site was split 50% industrial and 50% commercial. The AUAR further defines that the floor area ratio (FAR) is .25 for commercial and industrial uses (Table 6-2 in AUAR). Therefore, the size of development assumed in the AUAR for this 30 acre site was 163,350 sf of industrial and 163,500 sf of commercial. The traffic analysis in the AUAR (Section 21, Table 21-1) defines the assumptions used for each land use. The traffic generation for the proposed site should be compared with these uses and assumptions. • The AUAR made assumptions for future roadway improvements/connections (i.e. extending 21st Avenue to Cedar Street, a connection between 20th Avenue (CSAH 54) and 21st Avenue via Center Street, and improving Cedar Street to 20th Avenue (CSAH 54)). If these improvements are not being completed, the review should be updated to include an analysis and discussion on the associated traffic increases and traffic impacts at the critical intersections on either 20th Avenue (CSAH 54) and/or Main Street (CSAH 14).