CC 11-30-1998 - Laserfiche WebLink

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ARDEN HILLS CITY COUNCIL - NOVEMBER 30, 1998 13 . however, he did not have the new estimate available. The memo he had provided for this evening's meeting reviews these cost reductions as well as a comparison of the median and non- median alternatives. Mr. Brown stated the totals at this time for construction and easement acquisition for the median alternative was $1.78 million dollars, the non-median alternative was $1.54 million dollars, for a difference of approximately $238,000. The median alternative has a 15% wider footprint than the non-median alternative. The bitunlinous area of the median alternative was approximately 1,200 square meters less than the non-median alternative, however, the total prepared base area of the median alternative was approximately 600 square meters greater than the non-median alternative due to the larger amount of curb and gutter included in the median alternative. The larger footprint of the median alternative was reflected in additional common excavation costs and retaining wall costs totaling $48,150. The estimated storm sewer costs for the median alternative was greater than those for the non- median. The difference was a result of a longer pipe length for each series of catch-basins and approximately 14 extra catch-basins for median drainage. The median alternative would require the acquisition of a six-foot wide strip along the existing private properties to provide for a minimum of six feet of right-of-way adjacent to the eastern curb line. With the non-median alternative the six-foot right-of-way would be available now. . The median alternative would also require additional sodding of the medians at a minimum, the installation of irrigation sleeves for the median areas, and additional signage and mobilization costs. Mr. Brown indicated he also reviewed the cost per foot comparison. Recent residential street reconstruction projects within the City have cost approximately $200 per foot ofroadway. The proposed improvements for West Round Lake Road Phase II are estimated to cost approximately $575 for the median alternative or $550 for the non-median alternative. The primary reasons for this are: 1. The proposed pavement section includes 70% more bituminous surface mix, 50% more aggregate base and 50% more sand sub-base than the typical residential street. The heavier pavement section was necessary to provide for adequate carrying capacity for the truck traffic expected on the roadway. 2. Traffic control improvements include significant allowances for traffic control which includes items such as a concrete .T-barrier, temporary paving, temporary signage and temporary striping which normally are unnecessary for low volume residential streets. Mr. Brown indicated the estimate for this cost may be conservative and until the staging was worked out it will not be known ifthe J-barrier will be needed. 3. The roadway was much wider than a standard residential street. The non-median . alternative includes the construction of a 44-foot roadway with a 6-foot wide sidewalk. Typical residential streets are 32-feet wide and do not include sidewalks.