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ARDEN HILLS CITY COUNCIL - NOVEMBER 30, 1998 14 . 4. With either alternative there was a need to construct a retaining wall. With the median alternative the retaining wall would be slightly larger since the road will extend further into the bank. 5. The project includes estimated costs for modifications to the three TCAAP monitoring wellheads, permanent signage, striping and pavement markings which was more extensive than typical residential streets, clearing and grubbing and removal of existing culverts. 6. The project includes storm sewer catch-basins for the roadway as well as catch-basins for the commercial driveways. Overall pipe lengths are longer than typical residential streets and pipe diameters are greater to handle the larger flows from roadway and business runoff. Mr. Brown indicated that the last item he reviewed was enhancements. Primary cost estimates for potential enhancements include street lighting, landscape trees and shrubs, and an irrigation system. The irrigation system was assumed to provide irrigation to median areas only and therefor would be necessary if the median alternative was chosen. It was likely that the median alternative would require more landscaping due to the median areas. Councilmember Larson asked ifthe width ofthe six-foot sidewalk was standard. Mr. Brown . explained that this width was common. Trails are usually 10-feet wide and there are cases when sidewalks are wider but not narrower. Mayor Probst indicated he still had an issue with some of the numbers. He asked ifthe additional catch-basins would be in the median. Mr. Brown explained the catch-basins would be where the low end of the median occurs and pavement begins. The catch-basin was to catch any run-off before it gets out to the intersection. When a road was crowned there generally will not be water in the middle of the roadway, however, with the median alternative, water build up does occur. If a catch-basin was not used, snow can build up during the winter months and during the spring melt it can freeze and become hazardous. Mayor Probst asked Mr. Brown ifhe was proposing the overall cross sections be crowned, not the two roadways. Mr. Brown explained it could be designed witll either the two roadways crowned or the overall crown. Either way there will be a need for catch-basins in the middle of the roadway. Mr. Post presented a revised funding source analysis. He referred to Attachment B of his Staff memo dated November 25, 1998 and explained the attachment reviews the assessment assumptions and includes relevant definitions and excerpts from the City's Assessment Policy. Mr. Post indicated the item he wished to point out was number four, Commercial/Industrial Equivalent Assessment Rate, which reads "The commercial/industrial equivalent assessment rate shall be based upon 70% of the cost of street reconstruction for a typical commercial street . section." Mr. Post indicated this was in contrast to item five, The Municipal State-Aid Project - Reconstruction, which states "CommerciallIndustrial property abutting a Municipal State-Aid reconstruction project will be assessed all costs associated with reconstruction ofthe existing street to the City standards for commercial/industrial uses." ----